futriix/internal/api/webui.go

/*
 * Copyright 2026 Safronov Grigorii
 *
 * Licensed under the CDDL, Version 1.0 (the "License");
 * you may not use this file except in compliance with the License.
 *
 * You may obtain a copy of the License at
 * https://opensource.org/licenses/CDDL-1.0
 */

// Файл: internal/api/webui.go
// Назначение: Веб-интерфейс в стиле dashboard для управления СУБД futriis

package api

import (
    "bufio"
    "crypto/rand"
    "embed"
    "encoding/base64"
    "encoding/json"
    "fmt"
    "io/fs"
    "net/http"
    "os"
    "path/filepath"
    "runtime"
    "strconv"
    "strings"
    "sync"
    "time"

    "futriis/internal/acl"
    "futriis/internal/cluster"
    "futriis/internal/log"
    "futriis/internal/plugin"
    "futriis/internal/storage"
)

//go:embed static/*
var staticFiles embed.FS

// LogEntry представляет запись в логе веб-интерфейса
type LogEntry struct {
    Timestamp   int64                  `json:"timestamp"`
    Operation   string                 `json:"operation"`
    Target      string                 `json:"target"`
    User        string                 `json:"user"`
    Status      string                 `json:"status"`
    ErrorMsg    string                 `json:"error_msg,omitempty"`
    Details     map[string]interface{} `json:"details,omitempty"`
}

// LogBuffer буферизирует логи веб-интерфейса
type LogBuffer struct {
    entries   []LogEntry
    mu        sync.RWMutex
    maxSize   int
    filePath  string
    file      *os.File
    writer    *bufio.Writer
}

// NewLogBuffer создаёт новый буфер логов
func NewLogBuffer(filePath string, maxSize int) (*LogBuffer, error) {
    dir := filepath.Dir(filePath)
    if err := os.MkdirAll(dir, 0755); err != nil {
        return nil, fmt.Errorf("failed to create log directory: %v", err)
    }
    
    file, err := os.OpenFile(filePath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
    if err != nil {
        return nil, fmt.Errorf("failed to open log file: %v", err)
    }
    
    return &LogBuffer{
        entries:  make([]LogEntry, 0, maxSize),
        maxSize:  maxSize,
        filePath: filePath,
        file:     file,
        writer:   bufio.NewWriter(file),
    }, nil
}

// Add добавляет запись в лог
func (lb *LogBuffer) Add(entry LogEntry) {
    lb.mu.Lock()
    defer lb.mu.Unlock()
    
    lb.entries = append(lb.entries, entry)
    if len(lb.entries) > lb.maxSize {
        lb.entries = lb.entries[len(lb.entries)-lb.maxSize:]
    }
    
    data, err := json.Marshal(entry)
    if err == nil {
        lb.writer.Write(data)
        lb.writer.Write([]byte("\n"))
        lb.writer.Flush()
    }
}

// GetEntries возвращает все записи лога
func (lb *LogBuffer) GetEntries() []LogEntry {
    lb.mu.RLock()
    defer lb.mu.RUnlock()
    
    result := make([]LogEntry, len(lb.entries))
    copy(result, lb.entries)
    return result
}

// Close закрывает буфер логов
func (lb *LogBuffer) Close() error {
    if lb.writer != nil {
        lb.writer.Flush()
    }
    if lb.file != nil {
        return lb.file.Close()
    }
    return nil
}

// ========== SystemMetrics ==========

// SystemMetrics представляет системные метрики
type SystemMetrics struct {
    mu                sync.RWMutex
    RequestCount      uint64                     `json:"request_count"`
    ErrorCount        uint64                     `json:"error_count"`
    AverageLatencyMs  float64                    `json:"average_latency_ms"`
    P99LatencyMs      float64                    `json:"p99_latency_ms"`
    ActiveConnections int                        `json:"active_connections"`
    GoroutineCount    int                        `json:"goroutine_count"`
    MemoryAllocBytes  uint64                     `json:"memory_alloc_bytes"`
    MemoryTotalBytes  uint64                     `json:"memory_total_bytes"`
    GCPerSecond       float64                    `json:"gc_per_second"`
    CPUPercent        float64                    `json:"cpu_percent"`
    StartTime         int64                      `json:"start_time"`
    LastMetricTime    int64                      `json:"last_metric_time"`
    EndpointMetrics   map[string]*EndpointMetric `json:"endpoint_metrics"`
    latencyHistory    []float64
    maxHistorySize    int
}

// EndpointMetric представляет метрики для конкретного эндпоинта
type EndpointMetric struct {
    Count         uint64  `json:"count"`
    ErrorCount    uint64  `json:"error_count"`
    TotalLatencyMs float64 `json:"total_latency_ms"`
    AvgLatencyMs  float64 `json:"avg_latency_ms"`
    MaxLatencyMs  float64 `json:"max_latency_ms"`
    MinLatencyMs  float64 `json:"min_latency_ms"`
}

// NewSystemMetrics создаёт новый сборщик метрик
func NewSystemMetrics() *SystemMetrics {
    return &SystemMetrics{
        StartTime:       time.Now().UnixMilli(),
        EndpointMetrics: make(map[string]*EndpointMetric),
        latencyHistory:  make([]float64, 0, 1000),
        maxHistorySize:  10000,
    }
}

// sortFloat64sLocal локальная функция сортировки
func sortFloat64sLocal(a []float64) {
    for i := 0; i < len(a)-1; i++ {
        for j := i + 1; j < len(a); j++ {
            if a[i] > a[j] {
                a[i], a[j] = a[j], a[i]
            }
        }
    }
}

// RecordRequest записывает информацию о запросе
func (sm *SystemMetrics) RecordRequest(endpoint string, latencyMs float64, isError bool) {
    sm.mu.Lock()
    defer sm.mu.Unlock()
    
    sm.RequestCount++
    if isError {
        sm.ErrorCount++
    }
    
    em, exists := sm.EndpointMetrics[endpoint]
    if !exists {
        em = &EndpointMetric{
            MinLatencyMs: latencyMs,
            MaxLatencyMs: latencyMs,
        }
        sm.EndpointMetrics[endpoint] = em
    }
    
    em.Count++
    if isError {
        em.ErrorCount++
    }
    em.TotalLatencyMs += latencyMs
    em.AvgLatencyMs = em.TotalLatencyMs / float64(em.Count)
    if latencyMs > em.MaxLatencyMs {
        em.MaxLatencyMs = latencyMs
    }
    if latencyMs < em.MinLatencyMs {
        em.MinLatencyMs = latencyMs
    }
    
    sm.AverageLatencyMs = (sm.AverageLatencyMs*float64(sm.RequestCount-1) + latencyMs) / float64(sm.RequestCount)
    
    sm.latencyHistory = append(sm.latencyHistory, latencyMs)
    if len(sm.latencyHistory) > sm.maxHistorySize {
        sm.latencyHistory = sm.latencyHistory[len(sm.latencyHistory)-sm.maxHistorySize:]
    }
    
    if len(sm.latencyHistory) > 0 {
        sorted := make([]float64, len(sm.latencyHistory))
        copy(sorted, sm.latencyHistory)
        sortFloat64sLocal(sorted)
        p99Index := int(float64(len(sorted)) * 0.99)
        if p99Index < len(sorted) {
            sm.P99LatencyMs = sorted[p99Index]
        }
    }
}

// UpdateSystemInfo обновляет системную информацию
func (sm *SystemMetrics) UpdateSystemInfo() {
    sm.mu.Lock()
    defer sm.mu.Unlock()
    
    var memStats runtime.MemStats
    runtime.ReadMemStats(&memStats)
    
    sm.MemoryAllocBytes = memStats.Alloc
    sm.MemoryTotalBytes = memStats.TotalAlloc
    sm.GoroutineCount = runtime.NumGoroutine()
    sm.LastMetricTime = time.Now().UnixMilli()
    
    gcPauseTotal := memStats.PauseTotalNs
    timeDiff := float64(sm.LastMetricTime - sm.StartTime) / 1000.0
    if timeDiff > 0 {
        sm.GCPerSecond = float64(gcPauseTotal) / timeDiff / 1e9
    }
}

// GetMetrics возвращает копию метрик
func (sm *SystemMetrics) GetMetrics() map[string]interface{} {
    sm.mu.RLock()
    defer sm.mu.RUnlock()
    
    sm.UpdateSystemInfo()
    
    return map[string]interface{}{
        "request_count":       sm.RequestCount,
        "error_count":         sm.ErrorCount,
        "average_latency_ms":  sm.AverageLatencyMs,
        "p99_latency_ms":      sm.P99LatencyMs,
        "active_connections":  sm.ActiveConnections,
        "goroutine_count":     sm.GoroutineCount,
        "memory_alloc_bytes":  sm.MemoryAllocBytes,
        "memory_total_bytes":  sm.MemoryTotalBytes,
        "gc_per_second":       sm.GCPerSecond,
        "start_time":          sm.StartTime,
        "last_metric_time":    sm.LastMetricTime,
        "uptime_seconds":      (time.Now().UnixMilli() - sm.StartTime) / 1000,
        "endpoint_metrics":    sm.EndpointMetrics,
    }
}

// RecordConnection записывает изменение количества соединений
func (sm *SystemMetrics) RecordConnection(delta int) {
    sm.mu.Lock()
    defer sm.mu.Unlock()
    sm.ActiveConnections += delta
}

// ========== Health Check ==========

// HealthStatus представляет статус здоровья системы
type HealthStatus struct {
    Status     string                 `json:"status"`
    Timestamp  int64                  `json:"timestamp"`
    Components map[string]string      `json:"components"`
    Details    map[string]interface{} `json:"details"`
    Message    string                 `json:"message,omitempty"`
}

// HealthChecker проверяет здоровье компонентов
type HealthChecker struct {
    store       *storage.Storage
    coordinator *cluster.RaftCoordinator
    logger      *log.Logger
    mu          sync.RWMutex
    lastStatus  *HealthStatus
}

// NewHealthChecker создаёт новый проверяльщик здоровья
func NewHealthChecker(store *storage.Storage, coord *cluster.RaftCoordinator, logger *log.Logger) *HealthChecker {
    hc := &HealthChecker{
        store:       store,
        coordinator: coord,
        logger:      logger,
    }
    
    go hc.periodicCheck()
    
    return hc
}

// periodicCheck периодически проверяет здоровье
func (hc *HealthChecker) periodicCheck() {
    ticker := time.NewTicker(30 * time.Second)
    defer ticker.Stop()
    
    for range ticker.C {
        hc.Check()
    }
}

// Check выполняет проверку здоровья
func (hc *HealthChecker) Check() *HealthStatus {
    hc.mu.Lock()
    defer hc.mu.Unlock()
    
    status := &HealthStatus{
        Timestamp:  time.Now().UnixMilli(),
        Components: make(map[string]string),
        Details:    make(map[string]interface{}),
    }
    
    overallStatus := "healthy"
    
    if hc.store == nil {
        status.Components["storage"] = "unavailable"
        overallStatus = "unhealthy"
    } else {
        databases := hc.store.ListDatabases()
        status.Details["database_count"] = len(databases)
        if len(databases) >= 0 {
            status.Components["storage"] = "healthy"
        } else {
            status.Components["storage"] = "degraded"
            if overallStatus == "healthy" {
                overallStatus = "degraded"
            }
        }
    }
    
    if hc.coordinator == nil {
        status.Components["cluster"] = "disabled"
    } else {
        clusterStatus := hc.coordinator.GetClusterStatus()
        status.Details["cluster_health"] = clusterStatus.Health
        status.Details["active_nodes"] = clusterStatus.ActiveNodes
        status.Details["total_nodes"] = clusterStatus.TotalNodes
        
        if clusterStatus.Health == "critical" {
            status.Components["cluster"] = "critical"
            overallStatus = "unhealthy"
        } else if clusterStatus.Health == "degraded" {
            status.Components["cluster"] = "degraded"
            if overallStatus == "healthy" {
                overallStatus = "degraded"
            }
        } else {
            status.Components["cluster"] = "healthy"
        }
    }
    
    status.Status = overallStatus
    hc.lastStatus = status
    
    return status
}

// GetLastStatus возвращает последний статус здоровья
func (hc *HealthChecker) GetLastStatus() *HealthStatus {
    hc.mu.RLock()
    defer hc.mu.RUnlock()
    return hc.lastStatus
}

// ========== WebUIServer ==========

// WebUIServer представляет сервер веб-интерфейса
type WebUIServer struct {
    store          *storage.Storage
    coordinator    *cluster.RaftCoordinator
    aclManager     *acl.ACLManager
    logger         *log.Logger
    server         *http.Server
    port           int
    enabled        bool
    credentialMgr  *CredentialManager
    logBuffer      *LogBuffer
    pluginManager  *plugin.PluginManager
    metrics        *SystemMetrics
    healthChecker  *HealthChecker
    rateLimiter    *RateLimiter
}

// NewWebUIServer создаёт новый веб-сервер интерфейса
func NewWebUIServer(port int, enabled bool, store *storage.Storage, coord *cluster.RaftCoordinator, aclMgr *acl.ACLManager, logger *log.Logger) *WebUIServer {
    credMgr := NewCredentialManager()
    
    if err := credMgr.Load(); err != nil {
        logger.Warn(fmt.Sprintf("Failed to load credentials: %v, using defaults", err))
        if err := credMgr.CreateDefault(); err != nil {
            logger.Error(fmt.Sprintf("Failed to create default credentials: %v", err))
        }
    }
    
    logBuffer, err := NewLogBuffer("futriis/webui.log", 10000)
    if err != nil {
        logger.Warn(fmt.Sprintf("Failed to create log buffer: %v", err))
        logBuffer = &LogBuffer{entries: make([]LogEntry, 0, 1000)}
    }
    
    pluginManager := plugin.NewPluginManager("futriis/plugins", logger, store, true)
    
    w := &WebUIServer{
        store:         store,
        coordinator:   coord,
        aclManager:    aclMgr,
        logger:        logger,
        port:          port,
        enabled:       enabled,
        credentialMgr: credMgr,
        logBuffer:     logBuffer,
        pluginManager: pluginManager,
        metrics:       NewSystemMetrics(),
        rateLimiter:   NewRateLimiter(DefaultRateLimiterConfig()),
    }
    
    w.healthChecker = NewHealthChecker(store, coord, logger)
    
    return w
}

// generateSecureSessionID генерирует криптостойкий session ID
func generateSecureSessionID(username string) string {
    // 32 байта = 256 бит энтропии
    bytes := make([]byte, 32)
    _, err := rand.Read(bytes)
    if err != nil {
        // Fallback: используем комбинацию времени + username + random
        return fmt.Sprintf("fallback_%d_%s", time.Now().UnixNano(), username)
    }
    
    // Кодируем в base64 URL-safe
    sessionID := base64.URLEncoding.EncodeToString(bytes)
    
    // Добавляем username для трассировки (не влияет на безопасность)
    return fmt.Sprintf("%s_%s", sessionID[:24], username)
}

// middlewareWithMetrics добавляет метрики к обработчикам
func (w *WebUIServer) middlewareWithMetrics(handler http.HandlerFunc, endpoint string) http.HandlerFunc {
    return func(wr http.ResponseWriter, r *http.Request) {
        start := time.Now()
        
        rw := &responseWriter{ResponseWriter: wr, statusCode: http.StatusOK}
        
        // Применяем rate limiting
        if !w.rateLimiter.Allow(r.RemoteAddr) {
            w.rateLimiter.rejected.Add(1)
            wr.Header().Set("X-RateLimit-Limit", fmt.Sprintf("%d", w.rateLimiter.config.RequestsPerSecond))
            wr.Header().Set("X-RateLimit-Remaining", "0")
            wr.Header().Set("Retry-After", "1")
            http.Error(wr, "Rate limit exceeded. Please try again later.", http.StatusTooManyRequests)
            return
        }
        w.rateLimiter.allowed.Add(1)
        
        handler(rw, r)
        
        latency := float64(time.Since(start).Microseconds()) / 1000.0
        isError := rw.statusCode >= 400
        
        w.metrics.RecordRequest(endpoint, latency, isError)
        
        if w.logger != nil && isError {
            w.logger.Debugf("[METRICS] %s %s: %d in %.2fms", r.Method, endpoint, rw.statusCode, latency)
        }
    }
}

// responseWriter захватывает статус код
type responseWriter struct {
    http.ResponseWriter
    statusCode int
}

func (rw *responseWriter) WriteHeader(code int) {
    rw.statusCode = code
    rw.ResponseWriter.WriteHeader(code)
}

// logOperation логирует операцию веб-интерфейса
func (w *WebUIServer) logOperation(operation, target, status, errMsg string, details map[string]interface{}) {
    entry := LogEntry{
        Timestamp: time.Now().UnixMilli(),
        Operation: operation,
        Target:    target,
        User:      w.credentialMgr.GetCurrentUsername(),
        Status:    status,
        ErrorMsg:  errMsg,
        Details:   details,
    }
    
    if w.logBuffer != nil {
        w.logBuffer.Add(entry)
    }
    
    if w.logger != nil {
        if status == "error" {
            w.logger.Error(fmt.Sprintf("[WEBUI] %s: %s - %s", operation, target, errMsg))
        } else {
            w.logger.Info(fmt.Sprintf("[WEBUI] %s: %s", operation, target))
        }
    }
}

// Start запускает веб-сервер интерфейса
func (w *WebUIServer) Start() error {
    if !w.enabled {
        w.logger.Info("Web UI is disabled in configuration")
        return nil
    }

    mux := http.NewServeMux()

    staticFS, err := fs.Sub(staticFiles, "static")
    if err != nil {
        return fmt.Errorf("failed to load static files: %v", err)
    }
    mux.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.FS(staticFS))))

    mux.HandleFunc("/", w.handleWebIndex)

    // Observability endpoints
    mux.HandleFunc("/api/webui/metrics", w.middlewareWithMetrics(w.handleMetrics, "metrics"))
    mux.HandleFunc("/api/webui/health", w.middlewareWithMetrics(w.handleHealth, "health"))
    mux.HandleFunc("/api/webui/pipeline/status", w.middlewareWithMetrics(w.handlePipelineStatus, "pipeline_status"))
    mux.HandleFunc("/api/webui/resharding/trigger", w.middlewareWithMetrics(w.handleReshardingTrigger, "resharding_trigger"))

    // API для веб-интерфейса
    mux.HandleFunc("/api/webui/databases", w.middlewareWithMetrics(w.handleGetDatabases, "databases"))
    mux.HandleFunc("/api/webui/collections/", w.middlewareWithMetrics(w.handleGetCollections, "collections"))
    mux.HandleFunc("/api/webui/documents/", w.middlewareWithMetrics(w.handleDocuments, "documents"))
    mux.HandleFunc("/api/webui/cluster/status", w.middlewareWithMetrics(w.handleClusterStatus, "cluster_status"))
    mux.HandleFunc("/api/webui/cluster/nodes", w.middlewareWithMetrics(w.handleClusterNodes, "cluster_nodes"))
    mux.HandleFunc("/api/webui/stats", w.middlewareWithMetrics(w.handleStats, "stats"))
    mux.HandleFunc("/api/webui/login", w.middlewareWithMetrics(w.handleWebLogin, "login"))
    mux.HandleFunc("/api/webui/logout", w.middlewareWithMetrics(w.handleWebLogout, "logout"))
    mux.HandleFunc("/api/webui/session", w.middlewareWithMetrics(w.handleSessionCheck, "session"))
    mux.HandleFunc("/api/webui/change-password", w.middlewareWithMetrics(w.handleChangePassword, "change_password"))
    mux.HandleFunc("/api/webui/user/avatar", w.middlewareWithMetrics(w.handleUserAvatar, "user_avatar"))
    mux.HandleFunc("/api/webui/user/info", w.middlewareWithMetrics(w.handleUserInfo, "user_info"))
    mux.HandleFunc("/api/webui/admin/users", w.middlewareWithMetrics(w.handleAdminUsers, "admin_users"))
    mux.HandleFunc("/api/webui/logs", w.middlewareWithMetrics(w.handleWebLogs, "logs"))
    mux.HandleFunc("/api/webui/plugins", w.middlewareWithMetrics(w.handlePlugins, "plugins"))
    mux.HandleFunc("/api/webui/plugin/", w.middlewareWithMetrics(w.handlePluginOperation, "plugin_operation"))
    mux.HandleFunc("/api/webui/acl/users", w.middlewareWithMetrics(w.handleACLUsers, "acl_users"))
    mux.HandleFunc("/api/webui/acl/roles", w.middlewareWithMetrics(w.handleACLRoles, "acl_roles"))
    mux.HandleFunc("/api/webui/acl/permissions", w.middlewareWithMetrics(w.handleACLPermissions, "acl_permissions"))
    mux.HandleFunc("/api/webui/acl/user/", w.middlewareWithMetrics(w.handleACLUser, "acl_user"))
    mux.HandleFunc("/api/webui/acl/role/", w.middlewareWithMetrics(w.handleACLRole, "acl_role"))
    mux.HandleFunc("/api/webui/transactions", w.middlewareWithMetrics(w.handleTransactions, "transactions"))
    mux.HandleFunc("/api/webui/transaction/", w.middlewareWithMetrics(w.handleTransactionAction, "transaction_action"))
    mux.HandleFunc("/api/webui/indexes/", w.middlewareWithMetrics(w.handleIndexesList, "indexes_list"))
    mux.HandleFunc("/api/webui/index/", w.middlewareWithMetrics(w.handleIndexOperation, "index_operation"))
    mux.HandleFunc("/api/webui/export", w.middlewareWithMetrics(w.handleExportData, "export"))
    mux.HandleFunc("/api/webui/import", w.middlewareWithMetrics(w.handleImportData, "import"))
    mux.HandleFunc("/api/webui/triggers/", w.middlewareWithMetrics(w.handleTriggers, "triggers"))
    mux.HandleFunc("/api/webui/trigger/", w.middlewareWithMetrics(w.handleTriggerOperation, "trigger_operation"))
    mux.HandleFunc("/api/webui/trigger/log", w.middlewareWithMetrics(w.handleTriggerLog, "trigger_log"))
    mux.HandleFunc("/api/webui/constraints/", w.middlewareWithMetrics(w.handleConstraintsList, "constraints_list"))
    mux.HandleFunc("/api/webui/constraint/", w.middlewareWithMetrics(w.handleConstraintOperation, "constraint_operation"))

    w.server = &http.Server{
        Addr:         fmt.Sprintf(":%d", w.port),
        Handler:      mux,
        ReadTimeout:  30 * time.Second,
        WriteTimeout: 30 * time.Second,
    }

    w.logger.Info(fmt.Sprintf("Web UI started on port %d with observability enabled", w.port))
    return w.server.ListenAndServe()
}

// Stop останавливает веб-сервер
func (w *WebUIServer) Stop() error {
    if w.logBuffer != nil {
        w.logBuffer.Close()
    }
    if w.server != nil {
        return w.server.Close()
    }
    return nil
}

// checkAuth проверяет аутентификацию
func (w *WebUIServer) checkAuth(r *http.Request) bool {
    sessionID := w.getSessionID(r)
    return sessionID != ""
}

// getSessionID возвращает ID сессии из cookie
func (w *WebUIServer) getSessionID(r *http.Request) string {
    if cookie, err := r.Cookie("session_id"); err == nil {
        return cookie.Value
    }
    return ""
}

// sendJSONSuccess отправляет успешный JSON ответ
func (w *WebUIServer) sendJSONSuccess(wr http.ResponseWriter, data interface{}) {
    wr.Header().Set("Content-Type", "application/json")
    wr.WriteHeader(http.StatusOK)
    json.NewEncoder(wr).Encode(map[string]interface{}{
        "success": true,
        "data":    data,
    })
}

// sendJSONError отправляет JSON ответ с ошибкой
func (w *WebUIServer) sendJSONError(wr http.ResponseWriter, errMsg string, statusCode int) {
    wr.Header().Set("Content-Type", "application/json")
    wr.WriteHeader(statusCode)
    json.NewEncoder(wr).Encode(map[string]interface{}{
        "success": false,
        "error":   errMsg,
    })
}

// handleWebIndex возвращает главную HTML страницу
func (w *WebUIServer) handleWebIndex(wr http.ResponseWriter, r *http.Request) {
    if r.URL.Path != "/" {
        http.NotFound(wr, r)
        return
    }

    html := `<!DOCTYPE html>
<html lang="ru">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <title>Futriis Database Management System</title>
    <link rel="stylesheet" href="/static/style.css">
    <link href="https://fonts.googleapis.com/css2?family=Inter:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
</head>
<body>
    <div class="dashboard-container">
        <nav class="sidebar">
            <div class="sidebar-header">
                <div class="logo">
                    <img src="/static/logo.png" alt="Futriis" style="width: 112px; height: 53px; object-fit: contain;">
                </div>
                <button class="menu-toggle" id="menuToggle">
                    <i class="fas fa-bars"></i>
                </button>
            </div>
            
            <ul class="nav-menu">
                <li class="nav-item">
                    <a href="#" class="nav-link" data-section="dashboard">
                        <i class="fas fa-tachometer-alt"></i>
                        <span>Панель управления</span>
                    </a>
                </li>
                <li class="nav-item has-submenu">
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                <li class="nav-item has-submenu">
                    <a href="#" class="nav-link" data-submenu="transactions">
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                        <span>Транзакции</span>
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                    </a>
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                    <a href="#" class="nav-link" data-submenu="indexes">
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                    <a href="#" class="nav-link" data-submenu="import-export">
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            <div class="sidebar-footer">
                <div class="user-info" id="userInfo">
                    <div class="user-avatar" id="userAvatar">
                        <i class="fas fa-user-circle" style="font-size: 40px;"></i>
                    </div>
                    <div class="user-details">
                        <span id="userName">Гость</span>
                        <span id="userRole" class="user-role"></span>
                    </div>
                    <button class="change-password-icon" id="changePasswordIcon" title="Сменить пароль">
                        <i class="fas fa-key"></i>
                    </button>
                </div>
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                    <span>Выход</span>
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        </nav>
        
        <main class="main-content">
            <header class="top-bar">
                <h1 id="pageTitle">Панель управления <span class="version-badge">futriis 3i² (02.04.2026)</span></h1>
                <div class="connection-status" id="connectionStatus">
                    <span>Подключено</span>
                </div>
            </header>
            
            <div class="content-area" id="contentArea">
                <div class="loading-spinner">
                    <i class="fas fa-spinner fa-pulse"></i>
                    <p>Загрузка...</p>
                </div>
            </div>
        </main>
    </div>
    
    <div id="modal" class="modal">
        <div class="modal-content">
            <div class="modal-header">
                <h2 id="modalTitle">Заголовок</h2>
                <button class="modal-close">&times;</button>
            </div>
            <div class="modal-body" id="modalBody"></div>
            <div class="modal-footer">
                <button class="btn btn-secondary modal-close">Отмена</button>
                <button class="btn btn-primary" id="modalConfirm">Подтвердить</button>
            </div>
        </div>
    </div>
    
    <div id="avatarUploadModal" class="modal">
        <div class="modal-content">
            <div class="modal-header">
                <h2>Загрузить аватар</h2>
                <button class="modal-close">&times;</button>
            </div>
            <div class="modal-body">
                <div class="form-group">
                    <label>Выберите изображение (JPEG, PNG, GIF, до 2MB)</label>
                    <input type="file" id="avatarFile" class="form-control" accept="image/jpeg,image/png,image/gif">
                </div>
                <div id="avatarPreview" class="avatar-preview" style="text-align: center; margin-top: 16px;"></div>
            </div>
            <div class="modal-footer">
                <button class="btn btn-secondary modal-close">Отмена</button>
                <button class="btn btn-primary" id="uploadAvatarBtn">Загрузить</button>
            </div>
        </div>
    </div>
    
    <div id="changePasswordModal" class="modal">
        <div class="modal-content">
            <div class="modal-header">
                <h2>Смена пароля</h2>
                <button class="modal-close">&times;</button>
            </div>
            <div class="modal-body">
                <div class="form-group">
                    <label>Текущий пароль</label>
                    <input type="password" id="currentPassword" class="form-control" placeholder="Введите текущий пароль">
                </div>
                <div class="form-group">
                    <label>Новый пароль</label>
                    <input type="password" id="newPassword" class="form-control" placeholder="Введите новый пароль">
                </div>
                <div class="form-group">
                    <label>Подтверждение нового пароля</label>
                    <input type="password" id="confirmPassword" class="form-control" placeholder="Подтвердите новый пароль">
                </div>
            </div>
            <div class="modal-footer">
                <button class="btn btn-secondary modal-close">Отмена</button>
                <button class="btn btn-primary" id="changePasswordBtn">Сменить пароль</button>
            </div>
        </div>
    </div>
    
    <div id="notificationContainer" class="notification-container"></div>
    
    <script src="/static/app.js"></script>
</body>
</html>`
    
    wr.Header().Set("Content-Type", "text/html; charset=utf-8")
    wr.Write([]byte(html))
}

// ========== Observability Handlers ==========

// handleMetrics возвращает метрики системы
func (w *WebUIServer) handleMetrics(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    metrics := w.metrics.GetMetrics()
    
    if w.coordinator != nil {
        metrics["pipeline_stats"] = w.coordinator.GetPipelineStats()
        metrics["batch_commit_stats"] = w.coordinator.GetBatchCommitStats()
        metrics["resharding_stats"] = w.coordinator.GetReshardingStats()
        metrics["joint_consensus_status"] = w.coordinator.GetJointConsensusStatus()
    }
    
    metrics["rate_limiter_stats"] = w.rateLimiter.GetStats()
    
    w.sendJSONSuccess(wr, metrics)
}

// handleHealth возвращает статус здоровья
func (w *WebUIServer) handleHealth(wr http.ResponseWriter, r *http.Request) {
    status := w.healthChecker.Check()
    w.sendJSONSuccess(wr, status)
}

// handlePipelineStatus возвращает статус пайплайна
func (w *WebUIServer) handlePipelineStatus(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    if w.coordinator == nil {
        w.sendJSONError(wr, "Cluster not available", http.StatusServiceUnavailable)
        return
    }
    
    w.sendJSONSuccess(wr, map[string]interface{}{
        "pipeline":        w.coordinator.GetPipelineStats(),
        "batch_commit":    w.coordinator.GetBatchCommitStats(),
        "resharding":      w.coordinator.GetReshardingStats(),
        "joint_consensus": w.coordinator.GetJointConsensusStatus(),
    })
}

// handleReshardingTrigger запускает перераспределение шардов
func (w *WebUIServer) handleReshardingTrigger(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    if w.coordinator == nil {
        w.sendJSONError(wr, "Cluster not available", http.StatusServiceUnavailable)
        return
    }
    
    username := w.credentialMgr.GetCurrentUsername()
    if !w.credentialMgr.IsAdmin(username) {
        w.sendJSONError(wr, "Forbidden", http.StatusForbidden)
        return
    }
    
    var req struct {
        Reason string `json:"reason"`
    }
    json.NewDecoder(r.Body).Decode(&req)
    
    if req.Reason == "" {
        req.Reason = "manual_trigger"
    }
    
    if err := w.coordinator.TriggerResharding(req.Reason); err != nil {
        w.logOperation("RESHARDING_TRIGGER", "", "error", err.Error(), nil)
        w.sendJSONError(wr, err.Error(), http.StatusInternalServerError)
        return
    }
    
    w.logOperation("RESHARDING_TRIGGER", "", "success", "", map[string]interface{}{
        "reason": req.Reason,
    })
    
    w.sendJSONSuccess(wr, map[string]interface{}{
        "status": "resharding_triggered",
        "reason": req.Reason,
    })
}

// ========== Authentication Handlers ==========

// handleWebLogin обрабатывает вход в веб-интерфейс
func (w *WebUIServer) handleWebLogin(wr http.ResponseWriter, r *http.Request) {
    if r.Method != http.MethodPost {
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
        return
    }
    
    var creds struct {
        Username string `json:"username"`
        Password string `json:"password"`
    }
    
    if err := json.NewDecoder(r.Body).Decode(&creds); err != nil {
        w.sendJSONError(wr, "Invalid request body", http.StatusBadRequest)
        return
    }
    
    w.logger.Debug(fmt.Sprintf("Login attempt: username=%s", creds.Username))
    
    if !w.credentialMgr.Validate(creds.Username, creds.Password) {
        w.logger.Debug(fmt.Sprintf("Authentication failed for %s", creds.Username))
        w.logOperation("LOGIN", creds.Username, "error", "Invalid credentials", nil)
        w.sendJSONError(wr, "Неверный логин и/или пароль", http.StatusUnauthorized)
        return
    }
    
    // Криптостойкая генерация session ID
    sessionID := generateSecureSessionID(creds.Username)
    
    w.credentialMgr.SetCurrentUsername(creds.Username)
    w.credentialMgr.UpdateLastLogin(creds.Username)
    
    w.logger.Debug(fmt.Sprintf("Authentication successful for %s, sessionID=%s", creds.Username, sessionID[:20]+"..."))
    w.logOperation("LOGIN", creds.Username, "success", "", nil)
    
    // Устанавливаем secure cookie
    http.SetCookie(wr, &http.Cookie{
        Name:     "session_id",
        Value:    sessionID,
        Path:     "/",
        MaxAge:   86400,
        HttpOnly: true,
        Secure:   true,
        SameSite: http.SameSiteStrictMode,
    })
    
    avatarData := ""
    if avatar, err := w.credentialMgr.GetAvatar(creds.Username); err == nil && avatar != "" {
        avatarData = avatar
    }
    
    w.sendJSONSuccess(wr, map[string]interface{}{
        "session_id": sessionID,
        "username":   creds.Username,
        "avatar":     avatarData,
        "is_admin":   w.credentialMgr.IsAdmin(creds.Username),
    })
}

// handleWebLogout обрабатывает выход из веб-интерфейса
func (w *WebUIServer) handleWebLogout(wr http.ResponseWriter, r *http.Request) {
    username := w.credentialMgr.GetCurrentUsername()
    w.logOperation("LOGOUT", username, "success", "", nil)
    
    http.SetCookie(wr, &http.Cookie{
        Name:     "session_id",
        Value:    "",
        Path:     "/",
        MaxAge:   -1,
        HttpOnly: true,
        Secure:   true,
    })
    
    w.sendJSONSuccess(wr, map[string]interface{}{
        "status": "logged out",
    })
}

// handleSessionCheck проверяет активность сессии
func (w *WebUIServer) handleSessionCheck(wr http.ResponseWriter, r *http.Request) {
    sessionID := w.getSessionID(r)
    if sessionID == "" {
        w.sendJSONError(wr, "No session", http.StatusUnauthorized)
        return
    }
    
    username := w.credentialMgr.GetCurrentUsername()
    if username == "" {
        username = "admin"
    }
    
    connectionStatus := "connected"
    if w.coordinator == nil {
        connectionStatus = "disconnected"
    } else if status := w.coordinator.GetClusterStatus(); status.Health == "critical" {
        connectionStatus = "disconnected"
    }
    
    avatarData := ""
    if avatar, err := w.credentialMgr.GetAvatar(username); err == nil && avatar != "" {
        avatarData = avatar
    }
    
    w.sendJSONSuccess(wr, map[string]interface{}{
        "authenticated":     true,
        "username":          username,
        "avatar":            avatarData,
        "is_admin":          w.credentialMgr.IsAdmin(username),
        "connection_status": connectionStatus,
    })
}

// handleChangePassword обрабатывает смену пароля
func (w *WebUIServer) handleChangePassword(wr http.ResponseWriter, r *http.Request) {
    if r.Method != http.MethodPost {
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
        return
    }
    
    sessionID := w.getSessionID(r)
    if sessionID == "" {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    var req struct {
        CurrentPassword string `json:"current_password"`
        NewPassword     string `json:"new_password"`
    }
    
    if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
        w.sendJSONError(wr, "Invalid request body", http.StatusBadRequest)
        return
    }
    
    if req.CurrentPassword == "" || req.NewPassword == "" {
        w.sendJSONError(wr, "Current and new password are required", http.StatusBadRequest)
        return
    }
    
    if len(req.NewPassword) < 4 {
        w.sendJSONError(wr, "New password must be at least 4 characters", http.StatusBadRequest)
        return
    }
    
    username := w.credentialMgr.GetCurrentUsername()
    if username == "" {
        username = "admin"
    }
    
    if err := w.credentialMgr.ChangePassword(username, req.CurrentPassword, req.NewPassword); err != nil {
        w.logOperation("CHANGE_PASSWORD", username, "error", err.Error(), nil)
        w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
        return
    }
    
    w.logger.Info(fmt.Sprintf("Password changed for user: %s", username))
    w.logOperation("CHANGE_PASSWORD", username, "success", "", nil)
    w.sendJSONSuccess(wr, map[string]interface{}{
        "status":  "password_changed",
        "message": "Пароль успешно изменён",
    })
}

// handleUserAvatar обрабатывает загрузку и получение аватара пользователя
func (w *WebUIServer) handleUserAvatar(wr http.ResponseWriter, r *http.Request) {
    sessionID := w.getSessionID(r)
    if sessionID == "" {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    username := w.credentialMgr.GetCurrentUsername()
    if username == "" {
        username = "admin"
    }
    
    switch r.Method {
    case http.MethodGet:
        avatar, err := w.credentialMgr.GetAvatar(username)
        if err != nil {
            w.sendJSONError(wr, err.Error(), http.StatusNotFound)
            return
        }
        w.sendJSONSuccess(wr, map[string]interface{}{
            "avatar": avatar,
        })
        
    case http.MethodPost:
        if err := r.ParseMultipartForm(2 << 20); err != nil {
            w.sendJSONError(wr, "Failed to parse form: "+err.Error(), http.StatusBadRequest)
            return
        }
        
        file, handler, err := r.FormFile("avatar")
        if err != nil {
            w.sendJSONError(wr, "Failed to get avatar file: "+err.Error(), http.StatusBadRequest)
            return
        }
        defer file.Close()
        
        if handler.Size > 2<<20 {
            w.sendJSONError(wr, "Avatar file too large (max 2MB)", http.StatusBadRequest)
            return
        }
        
        contentType := handler.Header.Get("Content-Type")
        if contentType != "image/jpeg" && contentType != "image/png" && contentType != "image/gif" {
            w.sendJSONError(wr, "Invalid image type. Use JPEG, PNG or GIF", http.StatusBadRequest)
            return
        }
        
        fileData := make([]byte, handler.Size)
        if _, err := file.Read(fileData); err != nil {
            w.sendJSONError(wr, "Failed to read file: "+err.Error(), http.StatusInternalServerError)
            return
        }
        
        avatarBase64 := "data:" + contentType + ";base64," + base64.StdEncoding.EncodeToString(fileData)
        
        if err := w.credentialMgr.SetAvatar(username, avatarBase64); err != nil {
            w.sendJSONError(wr, "Failed to save avatar: "+err.Error(), http.StatusInternalServerError)
            return
        }
        
        w.logger.Info(fmt.Sprintf("Avatar uploaded for user: %s", username))
        w.logOperation("AVATAR_UPLOAD", username, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{
            "status": "avatar_uploaded",
            "avatar": avatarBase64,
        })
        
    case http.MethodDelete:
        if err := w.credentialMgr.DeleteAvatar(username); err != nil {
            w.sendJSONError(wr, err.Error(), http.StatusNotFound)
            return
        }
        w.logOperation("AVATAR_DELETE", username, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{
            "status": "avatar_deleted",
        })
        
    default:
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
    }
}

// handleUserInfo возвращает информацию о пользователе
func (w *WebUIServer) handleUserInfo(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    username := w.credentialMgr.GetCurrentUsername()
    if username == "" {
        username = "admin"
    }
    
    avatar, _ := w.credentialMgr.GetAvatar(username)
    
    w.sendJSONSuccess(wr, map[string]interface{}{
        "username": username,
        "avatar":   avatar,
        "is_admin": w.credentialMgr.IsAdmin(username),
    })
}

// ========== Database Handlers ==========

// handleGetDatabases возвращает список баз данных
func (w *WebUIServer) handleGetDatabases(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }

    databases := w.store.ListDatabases()
    
    dbInfo := make([]map[string]interface{}, 0)
    for _, dbName := range databases {
        db, err := w.store.GetDatabase(dbName)
        if err == nil {
            collections := db.ListCollections()
            dbInfo = append(dbInfo, map[string]interface{}{
                "name":        dbName,
                "collections": len(collections),
                "collections_list": collections,
            })
        }
    }
    
    w.sendJSONSuccess(wr, dbInfo)
}

// handleGetCollections возвращает список коллекций в базе данных
func (w *WebUIServer) handleGetCollections(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }

    path := strings.TrimPrefix(r.URL.Path, "/api/webui/collections/")
    parts := strings.Split(path, "/")
    
    if len(parts) < 1 || parts[0] == "" {
        w.sendJSONError(wr, "Database name required", http.StatusBadRequest)
        return
    }
    
    dbName := parts[0]
    db, err := w.store.GetDatabase(dbName)
    if err != nil {
        w.sendJSONError(wr, err.Error(), http.StatusNotFound)
        return
    }
    
    collections := db.ListCollections()
    collectionsInfo := make([]map[string]interface{}, 0)
    
    for _, collName := range collections {
        coll, err := db.GetCollection(collName)
        if err == nil {
            collectionsInfo = append(collectionsInfo, map[string]interface{}{
                "name":     collName,
                "count":    coll.Count(),
                "size":     coll.Size(),
                "indexes":  coll.GetIndexes(),
            })
        }
    }
    
    w.sendJSONSuccess(wr, map[string]interface{}{
        "database":    dbName,
        "collections": collectionsInfo,
    })
}

// handleDocuments обрабатывает CRUD операции с документами
func (w *WebUIServer) handleDocuments(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }

    path := strings.TrimPrefix(r.URL.Path, "/api/webui/documents/")
    parts := strings.Split(path, "/")
    
    if len(parts) < 2 {
        w.sendJSONError(wr, "Invalid path. Use /api/webui/documents/{database}/{collection}", http.StatusBadRequest)
        return
    }
    
    dbName := parts[0]
    collName := parts[1]
    
    db, err := w.store.GetDatabase(dbName)
    if err != nil {
        w.sendJSONError(wr, err.Error(), http.StatusNotFound)
        return
    }
    
    coll, err := db.GetCollection(collName)
    if err != nil {
        w.sendJSONError(wr, err.Error(), http.StatusNotFound)
        return
    }
    
    switch r.Method {
    case http.MethodGet:
        limit := 50
        if limitStr := r.URL.Query().Get("limit"); limitStr != "" {
            if l, err := strconv.Atoi(limitStr); err == nil && l > 0 && l <= 500 {
                limit = l
            }
        }
        
        offset := 0
        if offsetStr := r.URL.Query().Get("offset"); offsetStr != "" {
            if o, err := strconv.Atoi(offsetStr); err == nil && o >= 0 {
                offset = o
            }
        }
        
        allDocs := coll.GetAllDocuments()
        start := offset
        end := offset + limit
        if start > len(allDocs) {
            start = len(allDocs)
        }
        if end > len(allDocs) {
            end = len(allDocs)
        }
        
        docs := make([]map[string]interface{}, 0)
        for _, doc := range allDocs[start:end] {
            docs = append(docs, map[string]interface{}{
                "id":         doc.ID,
                "fields":     doc.GetFields(),
                "created_at": doc.CreatedAt,
                "updated_at": doc.UpdatedAt,
                "version":    doc.Version,
            })
        }
        
        w.sendJSONSuccess(wr, map[string]interface{}{
            "documents": docs,
            "total":     len(allDocs),
            "limit":     limit,
            "offset":    offset,
        })
        
    case http.MethodPost:
        var docData map[string]interface{}
        if err := json.NewDecoder(r.Body).Decode(&docData); err != nil {
            w.sendJSONError(wr, "Invalid JSON", http.StatusBadRequest)
            return
        }
        
        if err := coll.InsertFromMap(docData); err != nil {
            w.logOperation("INSERT_DOCUMENT", fmt.Sprintf("%s.%s", dbName, collName), "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        
        w.logOperation("INSERT_DOCUMENT", fmt.Sprintf("%s.%s/%v", dbName, collName, docData["_id"]), "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{
            "status": "inserted",
            "id":     docData["_id"],
        })
        
    case http.MethodPut:
        docID := r.URL.Query().Get("id")
        if docID == "" {
            w.sendJSONError(wr, "Document ID required", http.StatusBadRequest)
            return
        }
        
        var updates map[string]interface{}
        if err := json.NewDecoder(r.Body).Decode(&updates); err != nil {
            w.sendJSONError(wr, "Invalid JSON", http.StatusBadRequest)
            return
        }
        
        if err := coll.Update(docID, updates); err != nil {
            w.logOperation("UPDATE_DOCUMENT", fmt.Sprintf("%s.%s/%s", dbName, collName, docID), "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        
        w.logOperation("UPDATE_DOCUMENT", fmt.Sprintf("%s.%s/%s", dbName, collName, docID), "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{
            "status": "updated",
            "id":     docID,
        })
        
    case http.MethodDelete:
        docID := r.URL.Query().Get("id")
        if docID == "" {
            w.sendJSONError(wr, "Document ID required", http.StatusBadRequest)
            return
        }
        
        if err := coll.Delete(docID); err != nil {
            w.logOperation("DELETE_DOCUMENT", fmt.Sprintf("%s.%s/%s", dbName, collName, docID), "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusNotFound)
            return
        }
        
        w.logOperation("DELETE_DOCUMENT", fmt.Sprintf("%s.%s/%s", dbName, collName, docID), "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{
            "status": "deleted",
            "id":     docID,
        })
        
    default:
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
    }
}

// ========== Cluster Handlers ==========

// handleClusterStatus возвращает статус кластера
func (w *WebUIServer) handleClusterStatus(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    if w.coordinator == nil {
        w.sendJSONError(wr, "Cluster not available", http.StatusServiceUnavailable)
        return
    }
    
    status := w.coordinator.GetClusterStatus()
    w.sendJSONSuccess(wr, status)
}

// handleClusterNodes возвращает список узлов кластера
func (w *WebUIServer) handleClusterNodes(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    if w.coordinator == nil {
        w.sendJSONError(wr, "Cluster not available", http.StatusServiceUnavailable)
        return
    }
    
    nodes := w.coordinator.GetAllNodes()
    w.sendJSONSuccess(wr, nodes)
}

// handleStats возвращает статистику системы
func (w *WebUIServer) handleStats(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    databases := w.store.ListDatabases()
    totalDocs := int64(0)
    totalCollections := 0
    
    for _, dbName := range databases {
        db, _ := w.store.GetDatabase(dbName)
        if db != nil {
            collections := db.ListCollections()
            totalCollections += len(collections)
            for _, collName := range collections {
                coll, _ := db.GetCollection(collName)
                if coll != nil {
                    totalDocs += coll.Count()
                }
            }
        }
    }
    
    stats := map[string]interface{}{
        "databases":         len(databases),
        "collections":       totalCollections,
        "documents":         totalDocs,
        "storage_used_mb":   float64(w.store.GetPageSize()*int64(len(databases))) / (1024 * 1024),
        "uptime_seconds":    time.Now().Unix(),
        "cluster_enabled":   w.coordinator != nil,
        "replication_factor": 0,
    }
    
    if w.coordinator != nil {
        stats["replication_factor"] = w.coordinator.GetReplicationFactor()
        stats["cluster_health"] = w.coordinator.GetClusterStatus().Health
        stats["pipeline_enabled"] = true
        stats["batch_commit_enabled"] = true
        stats["resharding_enabled"] = true
    }
    
    w.sendJSONSuccess(wr, stats)
}

// ========== Logs Handlers ==========

// handleWebLogs возвращает логи веб-интерфейса
func (w *WebUIServer) handleWebLogs(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    username := w.credentialMgr.GetCurrentUsername()
    if !w.credentialMgr.IsAdmin(username) {
        w.sendJSONError(wr, "Forbidden", http.StatusForbidden)
        return
    }
    
    limit := 100
    if limitStr := r.URL.Query().Get("limit"); limitStr != "" {
        if l, err := strconv.Atoi(limitStr); err == nil && l > 0 && l <= 5000 {
            limit = l
        }
    }
    
    entries := w.logBuffer.GetEntries()
    if len(entries) > limit {
        entries = entries[len(entries)-limit:]
    }
    
    w.sendJSONSuccess(wr, entries)
}

// ========== Plugin Handlers ==========

// handlePlugins возвращает список плагинов
func (w *WebUIServer) handlePlugins(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    username := w.credentialMgr.GetCurrentUsername()
    if !w.credentialMgr.IsAdmin(username) {
        w.sendJSONError(wr, "Forbidden", http.StatusForbidden)
        return
    }
    
    switch r.Method {
    case http.MethodGet:
        plugins := w.pluginManager.ListPlugins()
        pluginList := make([]map[string]interface{}, 0, len(plugins))
        for _, p := range plugins {
            pluginList = append(pluginList, map[string]interface{}{
                "name":        p.Name,
                "version":     p.Version(),
                "author":      p.Author(),
                "description": p.Description(),
                "file_path":   p.FilePath,
                "loaded_at":   p.LoadedAt(),
            })
        }
        w.sendJSONSuccess(wr, pluginList)
        
    default:
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
    }
}

// handlePluginOperation обрабатывает операции с плагинами
func (w *WebUIServer) handlePluginOperation(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    username := w.credentialMgr.GetCurrentUsername()
    if !w.credentialMgr.IsAdmin(username) {
        w.sendJSONError(wr, "Forbidden", http.StatusForbidden)
        return
    }
    
    path := strings.TrimPrefix(r.URL.Path, "/api/webui/plugin/")
    parts := strings.Split(path, "/")
    
    if len(parts) < 2 {
        w.sendJSONError(wr, "Plugin name and action required", http.StatusBadRequest)
        return
    }
    
    pluginName := parts[0]
    action := parts[1]
    
    switch action {
    case "start":
        if r.Method != http.MethodPost {
            w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
            return
        }
        if err := w.pluginManager.StartPlugin(pluginName); err != nil {
            w.logOperation("PLUGIN_START", pluginName, "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        w.logOperation("PLUGIN_START", pluginName, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "started"})
        
    case "stop":
        if r.Method != http.MethodPost {
            w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
            return
        }
        if err := w.pluginManager.StopPlugin(pluginName); err != nil {
            w.logOperation("PLUGIN_STOP", pluginName, "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        w.logOperation("PLUGIN_STOP", pluginName, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "stopped"})
        
    case "reload":
        if r.Method != http.MethodPost {
            w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
            return
        }
        if err := w.pluginManager.UnloadPlugin(pluginName); err != nil {
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        w.logOperation("PLUGIN_RELOAD", pluginName, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "reloaded"})
        
    case "delete":
        if r.Method != http.MethodDelete {
            w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
            return
        }
        if err := w.pluginManager.UnloadPlugin(pluginName); err != nil {
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        pluginPath := filepath.Join(w.pluginManager.GetPluginsDir(), pluginName+".lua")
        if err := os.Remove(pluginPath); err != nil {
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        w.logOperation("PLUGIN_DELETE", pluginName, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "deleted"})
        
    case "upload":
        if r.Method != http.MethodPost {
            w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
            return
        }
        if err := r.ParseMultipartForm(1024 * 1024); err != nil {
            w.sendJSONError(wr, "Failed to parse form", http.StatusBadRequest)
            return
        }
        
        file, handler, err := r.FormFile("plugin")
        if err != nil {
            w.sendJSONError(wr, "Failed to get plugin file", http.StatusBadRequest)
            return
        }
        defer file.Close()
        
        if !strings.HasSuffix(handler.Filename, ".lua") {
            w.sendJSONError(wr, "Only .lua files are allowed", http.StatusBadRequest)
            return
        }
        
        pluginPath := filepath.Join(w.pluginManager.GetPluginsDir(), handler.Filename)
        
        dst, err := os.Create(pluginPath)
        if err != nil {
            w.sendJSONError(wr, "Failed to create plugin file", http.StatusInternalServerError)
            return
        }
        defer dst.Close()
        
        if _, err := file.Seek(0, 0); err != nil {
            w.sendJSONError(wr, "Failed to read file", http.StatusInternalServerError)
            return
        }
        
        if _, err := dst.ReadFrom(file); err != nil {
            w.sendJSONError(wr, "Failed to write plugin file", http.StatusInternalServerError)
            return
        }
        
        w.logOperation("PLUGIN_UPLOAD", handler.Filename, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "uploaded", "filename": handler.Filename})
        
    default:
        w.sendJSONError(wr, "Unknown action", http.StatusBadRequest)
    }
}

// ========== Admin Handlers ==========

// handleAdminUsers обрабатывает административные операции с пользователями
func (w *WebUIServer) handleAdminUsers(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    username := w.credentialMgr.GetCurrentUsername()
    if !w.credentialMgr.IsAdmin(username) {
        w.sendJSONError(wr, "Forbidden", http.StatusForbidden)
        return
    }
    
    switch r.Method {
    case http.MethodGet:
        users := w.credentialMgr.ListUsers()
        w.sendJSONSuccess(wr, users)
        
    case http.MethodPost:
        var req struct {
            Username string `json:"username"`
            Password string `json:"password"`
            IsAdmin  bool   `json:"is_admin"`
        }
        if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
            w.sendJSONError(wr, "Invalid request body", http.StatusBadRequest)
            return
        }
        
        if err := w.credentialMgr.CreateUser(req.Username, req.Password, req.IsAdmin); err != nil {
            w.logOperation("ADMIN_CREATE_USER", req.Username, "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        
        w.logOperation("ADMIN_CREATE_USER", req.Username, "success", "", map[string]interface{}{
            "is_admin": req.IsAdmin,
        })
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "created"})
        
    case http.MethodDelete:
        usernameToDelete := r.URL.Query().Get("username")
        if usernameToDelete == "" {
            w.sendJSONError(wr, "Username required", http.StatusBadRequest)
            return
        }
        
        if err := w.credentialMgr.DeleteUser(usernameToDelete); err != nil {
            w.logOperation("ADMIN_DELETE_USER", usernameToDelete, "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        
        w.logOperation("ADMIN_DELETE_USER", usernameToDelete, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "deleted"})
        
    case http.MethodPut:
        var req struct {
            Username    string `json:"username"`
            NewPassword string `json:"new_password"`
        }
        if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
            w.sendJSONError(wr, "Invalid request body", http.StatusBadRequest)
            return
        }
        
        if err := w.credentialMgr.AdminChangePassword(req.Username, req.NewPassword); err != nil {
            w.logOperation("ADMIN_CHANGE_PASSWORD", req.Username, "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        
        w.logOperation("ADMIN_CHANGE_PASSWORD", req.Username, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "password_changed"})
        
    default:
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
    }
}

// ========== ACL Handlers ==========

// handleACLUsers возвращает список пользователей ACL
func (w *WebUIServer) handleACLUsers(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    users := w.aclManager.ListUsers()
    usersInfo := make([]map[string]interface{}, 0)
    
    for _, username := range users {
        user, err := w.aclManager.GetUserInfo(username)
        if err == nil {
            usersInfo = append(usersInfo, map[string]interface{}{
                "username":   user.Username,
                "roles":      user.Roles,
                "active":     user.Active,
                "created_at": user.CreatedAt,
                "last_login": user.LastLogin,
            })
        }
    }
    
    w.sendJSONSuccess(wr, usersInfo)
}

// handleACLRoles возвращает список ролей ACL
func (w *WebUIServer) handleACLRoles(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    roles := w.aclManager.ListRoles()
    rolesInfo := make([]map[string]interface{}, 0)
    
    for _, roleName := range roles {
        perms, err := w.aclManager.GetRolePermissions(roleName)
        if err == nil {
            rolesInfo = append(rolesInfo, map[string]interface{}{
                "name":        roleName,
                "permissions": perms,
            })
        }
    }
    
    w.sendJSONSuccess(wr, rolesInfo)
}

// handleACLPermissions возвращает все разрешения ACL
func (w *WebUIServer) handleACLPermissions(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    roles := w.aclManager.ListRoles()
    allPermissions := make(map[string][]string)
    
    for _, roleName := range roles {
        perms, _ := w.aclManager.GetRolePermissions(roleName)
        allPermissions[roleName] = perms
    }
    
    w.sendJSONSuccess(wr, allPermissions)
}

// handleACLUser обрабатывает операции с конкретным пользователем ACL
func (w *WebUIServer) handleACLUser(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    path := strings.TrimPrefix(r.URL.Path, "/api/webui/acl/user/")
    username := path
    
    if username == "" {
        w.sendJSONError(wr, "Username required", http.StatusBadRequest)
        return
    }
    
    switch r.Method {
    case http.MethodPost:
        var req struct {
            Password string   `json:"password"`
            Roles    []string `json:"roles"`
        }
        if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
            w.sendJSONError(wr, "Invalid request body", http.StatusBadRequest)
            return
        }
        
        if err := w.aclManager.CreateUser(username, req.Password, req.Roles); err != nil {
            w.logOperation("ACL_CREATE_USER", username, "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        w.logOperation("ACL_CREATE_USER", username, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "created"})
        
    case http.MethodPut:
        var req struct {
            AddRole    string `json:"add_role"`
            RemoveRole string `json:"remove_role"`
            Password   string `json:"password"`
            Disable    bool   `json:"disable"`
            Enable     bool   `json:"enable"`
        }
        if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
            w.sendJSONError(wr, "Invalid request body", http.StatusBadRequest)
            return
        }
        
        if req.AddRole != "" {
            if err := w.aclManager.AddUserRole(username, req.AddRole); err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
                return
            }
        }
        
        if req.RemoveRole != "" {
            if err := w.aclManager.RemoveUserRole(username, req.RemoveRole); err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
                return
            }
        }
        
        if req.Password != "" {
            if err := w.aclManager.ChangePassword(username, req.Password); err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
                return
            }
        }
        
        if req.Disable {
            if err := w.aclManager.DisableUser(username); err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
                return
            }
        }
        
        if req.Enable {
            if err := w.aclManager.EnableUser(username); err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
                return
            }
        }
        
        w.logOperation("ACL_UPDATE_USER", username, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "updated"})
        
    case http.MethodDelete:
        if err := w.aclManager.DeleteUser(username); err != nil {
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        w.logOperation("ACL_DELETE_USER", username, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "deleted"})
        
    default:
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
    }
}

// handleACLRole обрабатывает операции с ролью ACL
func (w *WebUIServer) handleACLRole(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    path := strings.TrimPrefix(r.URL.Path, "/api/webui/acl/role/")
    parts := strings.Split(path, "/")
    
    roleName := parts[0]
    if roleName == "" {
        w.sendJSONError(wr, "Role name required", http.StatusBadRequest)
        return
    }
    
    switch r.Method {
    case http.MethodPost:
        if err := w.aclManager.CreateRole(roleName); err != nil {
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        w.logOperation("ACL_CREATE_ROLE", roleName, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "created"})
        
    case http.MethodPut:
        if len(parts) < 3 {
            w.sendJSONError(wr, "Action and permission required", http.StatusBadRequest)
            return
        }
        
        action := parts[1]
        permission := strings.Join(parts[2:], "/")
        
        switch action {
        case "grant":
            if err := w.aclManager.GrantPermission(roleName, permission); err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
                return
            }
        case "revoke":
            if err := w.aclManager.RevokePermission(roleName, permission); err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
                return
            }
        default:
            w.sendJSONError(wr, "Unknown action", http.StatusBadRequest)
            return
        }
        w.logOperation("ACL_UPDATE_ROLE", roleName, "success", "", map[string]interface{}{"action": action, "permission": permission})
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "updated"})
        
    case http.MethodDelete:
        if err := w.aclManager.DeleteRole(roleName); err != nil {
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        w.logOperation("ACL_DELETE_ROLE", roleName, "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "deleted"})
        
    default:
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
    }
}

// ========== Transaction Handlers ==========

// handleTransactions обрабатывает операции с транзакциями
func (w *WebUIServer) handleTransactions(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    switch r.Method {
    case http.MethodGet:
        txList := storage.GetActiveTransactions()
        w.sendJSONSuccess(wr, txList)
        
    case http.MethodPost:
        var req struct {
            Action string `json:"action"`
        }
        if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
            w.sendJSONError(wr, "Invalid request body", http.StatusBadRequest)
            return
        }
        
        switch req.Action {
        case "start_session":
            if err := storage.InitTransactionManager("futriis.wal"); err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusInternalServerError)
                return
            }
            w.logOperation("TRANSACTION_START_SESSION", "", "success", "", nil)
            w.sendJSONSuccess(wr, map[string]interface{}{"status": "session_started"})
            
        case "start_transaction":
            databases := w.store.ListDatabases()
            if len(databases) == 0 {
                w.sendJSONError(wr, "No database available", http.StatusBadRequest)
                return
            }
            
            db, err := w.store.GetDatabase(databases[0])
            if err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
                return
            }
            
            collections := db.ListCollections()
            if len(collections) == 0 {
                w.sendJSONError(wr, "No collection available", http.StatusBadRequest)
                return
            }
            
            coll, err := db.GetCollection(collections[0])
            if err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
                return
            }
            
            if err := storage.BeginTransactionOnCollection(coll); err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusInternalServerError)
                return
            }
            w.logOperation("TRANSACTION_START", "", "success", "", nil)
            w.sendJSONSuccess(wr, map[string]interface{}{"status": "transaction_started"})
            
        default:
            w.sendJSONError(wr, "Unknown action", http.StatusBadRequest)
        }
        
    default:
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
    }
}

// handleTransactionAction обрабатывает действия с транзакцией
func (w *WebUIServer) handleTransactionAction(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    path := strings.TrimPrefix(r.URL.Path, "/api/webui/transaction/")
    
    switch r.Method {
    case http.MethodPost:
        switch path {
        case "commit":
            if err := storage.CommitCurrentTransaction(); err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusInternalServerError)
                return
            }
            w.logOperation("TRANSACTION_COMMIT", "", "success", "", nil)
            w.sendJSONSuccess(wr, map[string]interface{}{"status": "committed"})
            
        case "abort":
            if err := storage.AbortCurrentTransaction(); err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusInternalServerError)
                return
            }
            w.logOperation("TRANSACTION_ABORT", "", "success", "", nil)
            w.sendJSONSuccess(wr, map[string]interface{}{"status": "aborted"})
            
        default:
            w.sendJSONError(wr, "Unknown action", http.StatusBadRequest)
        }
        
    default:
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
    }
}

// ========== Index Handlers ==========

// handleIndexesList возвращает список индексов
func (w *WebUIServer) handleIndexesList(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    path := strings.TrimPrefix(r.URL.Path, "/api/webui/indexes/")
    parts := strings.Split(path, "/")
    
    if len(parts) < 2 {
        w.sendJSONError(wr, "Database and collection required", http.StatusBadRequest)
        return
    }
    
    dbName := parts[0]
    collName := parts[1]
    
    db, err := w.store.GetDatabase(dbName)
    if err != nil {
        w.sendJSONError(wr, err.Error(), http.StatusNotFound)
        return
    }
    
    coll, err := db.GetCollection(collName)
    if err != nil {
        w.sendJSONError(wr, err.Error(), http.StatusNotFound)
        return
    }
    
    switch r.Method {
    case http.MethodGet:
        indexes := coll.GetIndexesInfo()
        w.sendJSONSuccess(wr, indexes)
        
    default:
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
    }
}

// handleIndexOperation обрабатывает операции с индексами
func (w *WebUIServer) handleIndexOperation(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    path := strings.TrimPrefix(r.URL.Path, "/api/webui/index/")
    parts := strings.Split(path, "/")
    
    if len(parts) < 3 {
        w.sendJSONError(wr, "Database, collection and action required", http.StatusBadRequest)
        return
    }
    
    dbName := parts[0]
    collName := parts[1]
    action := parts[2]
    
    db, err := w.store.GetDatabase(dbName)
    if err != nil {
        w.sendJSONError(wr, err.Error(), http.StatusNotFound)
        return
    }
    
    coll, err := db.GetCollection(collName)
    if err != nil {
        w.sendJSONError(wr, err.Error(), http.StatusNotFound)
        return
    }
    
    switch action {
    case "create":
        var req struct {
            Name   string   `json:"name"`
            Fields []string `json:"fields"`
            Unique bool     `json:"unique"`
        }
        if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
            w.sendJSONError(wr, "Invalid request body", http.StatusBadRequest)
            return
        }
        
        if err := coll.CreateIndex(req.Name, req.Fields, req.Unique); err != nil {
            w.logOperation("INDEX_CREATE", fmt.Sprintf("%s.%s.%s", dbName, collName, req.Name), "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        w.logOperation("INDEX_CREATE", fmt.Sprintf("%s.%s.%s", dbName, collName, req.Name), "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "created"})
        
    case "drop":
        if len(parts) < 4 {
            w.sendJSONError(wr, "Index name required", http.StatusBadRequest)
            return
        }
        indexName := parts[3]
        if err := coll.DropIndex(indexName); err != nil {
            w.logOperation("INDEX_DROP", fmt.Sprintf("%s.%s.%s", dbName, collName, indexName), "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        w.logOperation("INDEX_DROP", fmt.Sprintf("%s.%s.%s", dbName, collName, indexName), "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "dropped"})
        
    default:
        w.sendJSONError(wr, "Unknown action", http.StatusBadRequest)
    }
}

// ========== Import/Export Handlers ==========

// handleExportData обрабатывает экспорт данных
func (w *WebUIServer) handleExportData(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    if r.Method != http.MethodPost {
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
        return
    }
    
    var req struct {
        Database string `json:"database"`
        Filename string `json:"filename"`
        Format   string `json:"format"`
    }
    
    if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
        w.sendJSONError(wr, "Invalid request body", http.StatusBadRequest)
        return
    }
    
    if req.Database == "" {
        w.sendJSONError(wr, "Database name required", http.StatusBadRequest)
        return
    }
    
    if req.Filename == "" {
        req.Filename = req.Database + "_export_" + strconv.FormatInt(time.Now().Unix(), 10)
        if req.Format == "msgpack" {
            req.Filename += ".msgpack"
        } else {
            req.Filename += ".json"
        }
    }
    
    if req.Format == "" {
        req.Format = "json"
    }
    
    db, err := w.store.GetDatabase(req.Database)
    if err != nil {
        w.sendJSONError(wr, err.Error(), http.StatusNotFound)
        return
    }
    
    exportData := make(map[string]interface{})
    collections := db.ListCollections()
    totalDocuments := 0
    
    for _, collName := range collections {
        coll, err := db.GetCollection(collName)
        if err != nil {
            continue
        }
        
        docs := coll.GetAllDocuments()
        totalDocuments += len(docs)
        collData := make([]map[string]interface{}, 0, len(docs))
        for _, doc := range docs {
            docData := map[string]interface{}{
                "_id":        doc.ID,
                "fields":     doc.GetFields(),
                "created_at": doc.CreatedAt,
                "updated_at": doc.UpdatedAt,
                "version":    doc.Version,
            }
            if doc.DeletedAt > 0 {
                docData["deleted_at"] = doc.DeletedAt
            }
            collData = append(collData, docData)
        }
        exportData[collName] = collData
    }
    
    exportData["_metadata"] = map[string]interface{}{
        "database":         req.Database,
        "export_time":      time.Now().Unix(),
        "export_time_str":  time.Now().Format("2006-01-02 15:04:05.000"),
        "version":          "1.0",
        "collections":      len(collections),
        "total_documents":  totalDocuments,
        "format":           req.Format,
        "exported_by":      w.credentialMgr.GetCurrentUsername(),
    }
    
    w.logOperation("EXPORT", req.Database, "success", "", map[string]interface{}{
        "collections":     len(collections),
        "total_documents": totalDocuments,
        "format":          req.Format,
    })
    
    w.sendJSONSuccess(wr, map[string]interface{}{
        "status":           "export_prepared",
        "database":         req.Database,
        "filename":         req.Filename,
        "format":           req.Format,
        "collections":      len(collections),
        "total_documents":  totalDocuments,
        "data":             exportData,
    })
}

// handleImportData обрабатывает импорт данных
func (w *WebUIServer) handleImportData(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    if r.Method != http.MethodPost {
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
        return
    }
    
    var req struct {
        Database  string                 `json:"database"`
        Data      map[string]interface{} `json:"data"`
        Overwrite bool                   `json:"overwrite"`
        Format    string                 `json:"format"`
    }
    
    if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
        w.sendJSONError(wr, "Invalid request body", http.StatusBadRequest)
        return
    }
    
    if req.Database == "" {
        w.sendJSONError(wr, "Database name required", http.StatusBadRequest)
        return
    }
    
    if req.Data == nil {
        w.sendJSONError(wr, "Import data required", http.StatusBadRequest)
        return
    }
    
    if req.Format == "" {
        req.Format = "json"
    }
    
    if !w.store.ExistsDatabase(req.Database) {
        if err := w.store.CreateDatabase(req.Database); err != nil {
            w.sendJSONError(wr, err.Error(), http.StatusInternalServerError)
            return
        }
    }
    
    db, err := w.store.GetDatabase(req.Database)
    if err != nil {
        w.sendJSONError(wr, err.Error(), http.StatusNotFound)
        return
    }
    
    importedCollections := 0
    importedDocuments := 0
    skippedDocuments := 0
    failedDocuments := 0
    
    for key, value := range req.Data {
        if key == "_metadata" {
            continue
        }
        
        collName := key
        collData, ok := value.([]interface{})
        if !ok {
            continue
        }
        
        if _, err := db.GetCollection(collName); err != nil {
            if err := db.CreateCollection(collName); err != nil {
                w.logOperation("IMPORT_COLLECTION_CREATE", collName, "error", err.Error(), nil)
                continue
            }
        }
        
        coll, err := db.GetCollection(collName)
        if err != nil {
            continue
        }
        
        for _, docRaw := range collData {
            docMap, ok := docRaw.(map[string]interface{})
            if !ok {
                failedDocuments++
                continue
            }
            
            var docID string
            if id, ok := docMap["_id"].(string); ok {
                docID = id
            } else {
                failedDocuments++
                continue
            }
            
            if existingDoc, _ := coll.Find(docID); existingDoc != nil && !req.Overwrite {
                skippedDocuments++
                continue
            }
            
            doc := storage.NewDocumentWithID(docID)
            
            if fields, ok := docMap["fields"].(map[string]interface{}); ok {
                for k, v := range fields {
                    doc.SetField(k, v)
                }
            }
            
            if createdAt, ok := docMap["created_at"]; ok {
                switch v := createdAt.(type) {
                case float64:
                    doc.CreatedAt = int64(v)
                case int64:
                    doc.CreatedAt = v
                }
            }
            
            if updatedAt, ok := docMap["updated_at"]; ok {
                switch v := updatedAt.(type) {
                case float64:
                    doc.UpdatedAt = int64(v)
                case int64:
                    doc.UpdatedAt = v
                }
            }
            
            if deletedAt, ok := docMap["deleted_at"]; ok {
                switch v := deletedAt.(type) {
                case float64:
                    doc.DeletedAt = int64(v)
                case int64:
                    doc.DeletedAt = v
                }
            }
            
            if version, ok := docMap["version"]; ok {
                switch v := version.(type) {
                case float64:
                    doc.Version = uint64(v)
                case int64:
                    doc.Version = uint64(v)
                case uint64:
                    doc.Version = v
                }
            }
            
            if err := coll.Insert(doc); err != nil {
                failedDocuments++
                continue
            }
            importedDocuments++
        }
        importedCollections++
    }
    
    w.logOperation("IMPORT", req.Database, "success", "", map[string]interface{}{
        "collections": importedCollections,
        "documents":   importedDocuments,
        "skipped":     skippedDocuments,
        "failed":      failedDocuments,
        "overwrite":   req.Overwrite,
        "format":      req.Format,
    })
    
    w.sendJSONSuccess(wr, map[string]interface{}{
        "status":      "imported",
        "database":    req.Database,
        "collections": importedCollections,
        "documents":   importedDocuments,
        "skipped":     skippedDocuments,
        "failed":      failedDocuments,
        "format":      req.Format,
    })
}

// ========== Trigger Handlers ==========

// handleTriggers возвращает список триггеров
func (w *WebUIServer) handleTriggers(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    path := strings.TrimPrefix(r.URL.Path, "/api/webui/triggers/")
    parts := strings.Split(path, "/")
    
    tm := storage.GetTriggerManager()
    if tm == nil {
        storage.InitTriggerManager(w.logger)
        tm = storage.GetTriggerManager()
    }
    
    switch r.Method {
    case http.MethodGet:
        if len(parts) >= 2 && parts[0] != "" && parts[1] != "" {
            dbName := parts[0]
            collName := parts[1]
            
            db, err := w.store.GetDatabase(dbName)
            if err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusNotFound)
                return
            }
            
            if _, err := db.GetCollection(collName); err != nil {
                w.sendJSONError(wr, err.Error(), http.StatusNotFound)
                return
            }
            
            triggers := tm.ListTriggers(collName)
            
            triggerList := make([]map[string]interface{}, 0, len(triggers))
            for _, trigger := range triggers {
                triggerList = append(triggerList, map[string]interface{}{
                    "name":            trigger.Name,
                    "collection":      trigger.Collection,
                    "event":           trigger.Event,
                    "action":          trigger.Action,
                    "enabled":         trigger.Enabled,
                    "description":     trigger.Description,
                    "created_at":      trigger.CreatedAt,
                    "updated_at":      trigger.UpdatedAt,
                    "has_condition":   trigger.Condition != nil,
                    "operations_count": len(trigger.Operations),
                })
            }
            w.sendJSONSuccess(wr, triggerList)
        } else {
            triggers := tm.ListTriggers("")
            triggerList := make([]map[string]interface{}, 0, len(triggers))
            for _, trigger := range triggers {
                triggerList = append(triggerList, map[string]interface{}{
                    "name":        trigger.Name,
                    "collection":  trigger.Collection,
                    "event":       trigger.Event,
                    "action":      trigger.Action,
                    "enabled":     trigger.Enabled,
                    "description": trigger.Description,
                    "created_at":  trigger.CreatedAt,
                })
            }
            w.sendJSONSuccess(wr, triggerList)
        }
        
    default:
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
    }
}

// handleTriggerOperation обрабатывает операции с триггерами
func (w *WebUIServer) handleTriggerOperation(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    path := strings.TrimPrefix(r.URL.Path, "/api/webui/trigger/")
    parts := strings.Split(path, "/")
    
    if len(parts) < 3 {
        w.sendJSONError(wr, "Invalid path. Use /api/webui/trigger/{db}/{collection}/{action}", http.StatusBadRequest)
        return
    }
    
    dbName := parts[0]
    collName := parts[1]
    action := parts[2]
    
    tm := storage.GetTriggerManager()
    if tm == nil {
        storage.InitTriggerManager(w.logger)
        tm = storage.GetTriggerManager()
    }
    
    switch action {
    case "create":
        if r.Method != http.MethodPost {
            w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
            return
        }
        
        var req struct {
            Name        string                   `json:"name"`
            Event       string                   `json:"event"`
            Action      string                   `json:"action"`
            Condition   map[string]interface{}   `json:"condition"`
            Operations  []map[string]interface{} `json:"operations"`
            Description string                   `json:"description"`
        }
        
        if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
            w.sendJSONError(wr, "Invalid request body", http.StatusBadRequest)
            return
        }
        
        if req.Name == "" {
            w.sendJSONError(wr, "Trigger name required", http.StatusBadRequest)
            return
        }
        
        config := make(map[string]interface{})
        config["action"] = req.Action
        config["description"] = req.Description
        
        if req.Condition != nil {
            config["condition"] = req.Condition
        }
        
        if len(req.Operations) > 0 {
            ops := make([]interface{}, len(req.Operations))
            for i, op := range req.Operations {
                ops[i] = op
            }
            config["operations"] = ops
        }
        
        event := storage.TriggerEvent(req.Event)
        if event == "" {
            event = storage.TriggerAfterInsert
        }
        
        if err := tm.CreateTrigger(dbName, collName, req.Name, event, config); err != nil {
            w.logOperation("TRIGGER_CREATE", fmt.Sprintf("%s.%s.%s", dbName, collName, req.Name), "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusBadRequest)
            return
        }
        
        w.logOperation("TRIGGER_CREATE", fmt.Sprintf("%s.%s.%s", dbName, collName, req.Name), "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{
            "status": "created",
            "name":   req.Name,
        })
        
    case "enable":
        if r.Method != http.MethodPost {
            w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
            return        }
        
        if len(parts) < 4 {
            w.sendJSONError(wr, "Trigger name required", http.StatusBadRequest)
            return
        }
        triggerName := parts[3]
        
        if err := tm.EnableTrigger(collName, "", triggerName); err != nil {
            w.logOperation("TRIGGER_ENABLE", fmt.Sprintf("%s.%s.%s", dbName, collName, triggerName), "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusNotFound)
            return
        }
        w.logOperation("TRIGGER_ENABLE", fmt.Sprintf("%s.%s.%s", dbName, collName, triggerName), "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "enabled", "name": triggerName})
        
    case "disable":
        if r.Method != http.MethodPost {
            w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
            return
        }
        
        if len(parts) < 4 {
            w.sendJSONError(wr, "Trigger name required", http.StatusBadRequest)
            return
        }
        triggerName := parts[3]
        
        if err := tm.DisableTrigger(collName, "", triggerName); err != nil {
            w.logOperation("TRIGGER_DISABLE", fmt.Sprintf("%s.%s.%s", dbName, collName, triggerName), "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusNotFound)
            return
        }
        w.logOperation("TRIGGER_DISABLE", fmt.Sprintf("%s.%s.%s", dbName, collName, triggerName), "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "disabled", "name": triggerName})
        
    case "delete":
        if r.Method != http.MethodDelete {
            w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
            return
        }
        
        if len(parts) < 4 {
            w.sendJSONError(wr, "Trigger name required", http.StatusBadRequest)
            return
        }
        triggerName := parts[3]
        triggerEvent := ""
        if len(parts) > 4 {
            triggerEvent = parts[4]
        }
        
        if err := tm.DropTrigger(collName, triggerEvent, triggerName); err != nil {
            w.logOperation("TRIGGER_DELETE", fmt.Sprintf("%s.%s.%s", dbName, collName, triggerName), "error", err.Error(), nil)
            w.sendJSONError(wr, err.Error(), http.StatusNotFound)
            return
        }
        w.logOperation("TRIGGER_DELETE", fmt.Sprintf("%s.%s.%s", dbName, collName, triggerName), "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{"status": "deleted", "name": triggerName})
        
    default:
        w.sendJSONError(wr, "Unknown action", http.StatusBadRequest)
    }
}

// handleTriggerLog возвращает лог выполнения триггеров
func (w *WebUIServer) handleTriggerLog(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    if r.Method != http.MethodGet {
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
        return
    }
    
    tm := storage.GetTriggerManager()
    if tm == nil {
        w.sendJSONSuccess(wr, []interface{}{})
        return
    }
    
    logEntries := tm.GetTriggerExecutionLog()
    
    formattedLog := make([]map[string]interface{}, 0, len(logEntries))
    for _, entry := range logEntries {
        formattedLog = append(formattedLog, map[string]interface{}{
            "trigger_name": entry.TriggerName,
            "event":        entry.Event,
            "collection":   entry.Collection,
            "database":     entry.Database,
            "document_id":  entry.DocumentID,
            "operation":    entry.Operation,
            "timestamp":    entry.Timestamp.UnixMilli(),
            "user":         entry.User,
            "role":         entry.Role,
            "custom_data":  entry.CustomData,
        })
    }
    
    w.sendJSONSuccess(wr, formattedLog)
}

// ========== Constraint Handlers ==========

// handleConstraintsList возвращает список ограничений
func (w *WebUIServer) handleConstraintsList(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    if r.Method != http.MethodGet {
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
        return
    }
    
    path := strings.TrimPrefix(r.URL.Path, "/api/webui/constraints/")
    parts := strings.Split(path, "/")
    
    if len(parts) < 2 {
        w.sendJSONError(wr, "Database and collection required", http.StatusBadRequest)
        return
    }
    
    dbName := parts[0]
    collName := parts[1]
    
    db, err := w.store.GetDatabase(dbName)
    if err != nil {
        w.sendJSONError(wr, err.Error(), http.StatusNotFound)
        return
    }
    
    coll, err := db.GetCollection(collName)
    if err != nil {
        w.sendJSONError(wr, err.Error(), http.StatusNotFound)
        return
    }
    
    constraintsList := make([]map[string]interface{}, 0)
    
    requiredFields := coll.GetRequiredFields()
    for _, field := range requiredFields {
        constraintsList = append(constraintsList, map[string]interface{}{
            "type":  "required",
            "field": field,
        })
    }
    
    uniqueFields := coll.GetUniqueConstraints()
    for _, field := range uniqueFields {
        constraintsList = append(constraintsList, map[string]interface{}{
            "type":  "unique",
            "field": field,
        })
    }
    
    minConstraints := coll.GetMinConstraints()
    for field, value := range minConstraints {
        constraintsList = append(constraintsList, map[string]interface{}{
            "type":  "min",
            "field": field,
            "value": value,
        })
    }
    
    maxConstraints := coll.GetMaxConstraints()
    for field, value := range maxConstraints {
        constraintsList = append(constraintsList, map[string]interface{}{
            "type":  "max",
            "field": field,
            "value": value,
        })
    }
    
    enumConstraints := coll.GetEnumConstraints()
    for field, values := range enumConstraints {
        constraintsList = append(constraintsList, map[string]interface{}{
            "type":   "enum",
            "field":  field,
            "values": values,
        })
    }
    
    regexConstraints := coll.GetRegexConstraints()
    for field, pattern := range regexConstraints {
        constraintsList = append(constraintsList, map[string]interface{}{
            "type":    "regex",
            "field":   field,
            "pattern": pattern,
        })
    }
    
    w.sendJSONSuccess(wr, constraintsList)
}

// handleConstraintOperation обрабатывает операции с ограничениями
func (w *WebUIServer) handleConstraintOperation(wr http.ResponseWriter, r *http.Request) {
    if !w.checkAuth(r) {
        w.sendJSONError(wr, "Unauthorized", http.StatusUnauthorized)
        return
    }
    
    path := strings.TrimPrefix(r.URL.Path, "/api/webui/constraint/")
    parts := strings.Split(path, "/")
    
    if len(parts) < 3 {
        w.sendJSONError(wr, "Invalid path. Use /api/webui/constraint/{db}/{collection}/{action}", http.StatusBadRequest)
        return
    }
    
    dbName := parts[0]
    collName := parts[1]
    action := parts[2]
    
    db, err := w.store.GetDatabase(dbName)
    if err != nil {
        w.sendJSONError(wr, err.Error(), http.StatusNotFound)
        return
    }
    
    coll, err := db.GetCollection(collName)
    if err != nil {
        w.sendJSONError(wr, err.Error(), http.StatusNotFound)
        return
    }
    
    switch r.Method {
    case http.MethodPost:
        switch action {
        case "required":
            if len(parts) < 4 {
                w.sendJSONError(wr, "Field name required", http.StatusBadRequest)
                return
            }
            field := parts[3]
            coll.AddRequiredField(field)
            w.logOperation("CONSTRAINT_ADD", fmt.Sprintf("%s.%s.required.%s", dbName, collName, field), "success", "", nil)
            w.sendJSONSuccess(wr, map[string]interface{}{
                "status": "added",
                "type":   "required",
                "field":  field,
            })
            
        case "unique":
            if len(parts) < 4 {
                w.sendJSONError(wr, "Field name required", http.StatusBadRequest)
                return
            }
            field := parts[3]
            coll.AddUniqueConstraint(field)
            w.logOperation("CONSTRAINT_ADD", fmt.Sprintf("%s.%s.unique.%s", dbName, collName, field), "success", "", nil)
            w.sendJSONSuccess(wr, map[string]interface{}{
                "status": "added",
                "type":   "unique",
                "field":  field,
            })
            
        case "min":
            if len(parts) < 5 {
                w.sendJSONError(wr, "Field name and value required", http.StatusBadRequest)
                return
            }
            field := parts[3]
            minVal, err := strconv.ParseFloat(parts[4], 64)
            if err != nil {
                w.sendJSONError(wr, "Invalid minimum value", http.StatusBadRequest)
                return
            }
            coll.AddMinConstraint(field, minVal)
            w.logOperation("CONSTRAINT_ADD", fmt.Sprintf("%s.%s.min.%s", dbName, collName, field), "success", "", map[string]interface{}{"value": minVal})
            w.sendJSONSuccess(wr, map[string]interface{}{
                "status": "added",
                "type":   "min",
                "field":  field,
                "value":  minVal,
            })
            
        case "max":
            if len(parts) < 5 {
                w.sendJSONError(wr, "Field name and value required", http.StatusBadRequest)
                return
            }
            field := parts[3]
            maxVal, err := strconv.ParseFloat(parts[4], 64)
            if err != nil {
                w.sendJSONError(wr, "Invalid maximum value", http.StatusBadRequest)
                return
            }
            coll.AddMaxConstraint(field, maxVal)
            w.logOperation("CONSTRAINT_ADD", fmt.Sprintf("%s.%s.max.%s", dbName, collName, field), "success", "", map[string]interface{}{"value": maxVal})
            w.sendJSONSuccess(wr, map[string]interface{}{
                "status": "added",
                "type":   "max",
                "field":  field,
                "value":  maxVal,
            })
            
        case "enum":
            if len(parts) < 5 {
                w.sendJSONError(wr, "Field name and values required", http.StatusBadRequest)
                return
            }
            field := parts[3]
            values := make([]interface{}, len(parts)-4)
            for i := 4; i < len(parts); i++ {
                if num, err := strconv.ParseFloat(parts[i], 64); err == nil {
                    values[i-4] = num
                } else {
                    values[i-4] = parts[i]
                }
            }
            coll.AddEnumConstraint(field, values)
            w.logOperation("CONSTRAINT_ADD", fmt.Sprintf("%s.%s.enum.%s", dbName, collName, field), "success", "", nil)
            w.sendJSONSuccess(wr, map[string]interface{}{
                "status": "added",
                "type":   "enum",
                "field":  field,
                "values": values,
            })
            
        case "regex":
            if len(parts) < 5 {
                w.sendJSONError(wr, "Field name and pattern required", http.StatusBadRequest)
                return
            }
            field := parts[3]
            pattern := parts[4]
            coll.AddRegexConstraint(field, pattern)
            w.logOperation("CONSTRAINT_ADD", fmt.Sprintf("%s.%s.regex.%s", dbName, collName, field), "success", "", nil)
            w.sendJSONSuccess(wr, map[string]interface{}{
                "status":  "added",
                "type":    "regex",
                "field":   field,
                "pattern": pattern,
            })
            
        default:
            w.sendJSONError(wr, "Unknown constraint type", http.StatusBadRequest)
        }
        
    case http.MethodDelete:
        if len(parts) < 4 {
            w.sendJSONError(wr, "Constraint type and field required", http.StatusBadRequest)
            return
        }
        constraintType := parts[2]
        field := parts[3]
        
        switch constraintType {
        case "required":
            coll.RemoveRequiredField(field)
        case "unique":
            coll.RemoveUniqueConstraint(field)
        case "min":
            coll.RemoveMinConstraint(field)
        case "max":
            coll.RemoveMaxConstraint(field)
        case "enum":
            coll.RemoveEnumConstraint(field)
        case "regex":
            coll.RemoveRegexConstraint(field)
        default:
            w.sendJSONError(wr, "Unknown constraint type", http.StatusBadRequest)
            return
        }
        
        w.logOperation("CONSTRAINT_REMOVE", fmt.Sprintf("%s.%s.%s.%s", dbName, collName, constraintType, field), "success", "", nil)
        w.sendJSONSuccess(wr, map[string]interface{}{
            "status": "removed",
            "type":   constraintType,
            "field":  field,
        })
        
    default:
        w.sendJSONError(wr, "Method not allowed", http.StatusMethodNotAllowed)
    }
}