// /futriis/internal/storage/slice.go
// Пакет storage реализует операции со слайсами (таблицами)

package storage

import (
	"errors"
	"sync/atomic"
	
	"futriis/pkg/types"
	"futriis/pkg/utils"
)

// SliceManager управляет операциями со слайсами
type SliceManager struct {
	tupleManager *TupleManager
	stats        struct {
		created int64
		deleted int64
	}
}

// NewSliceManager создаёт новый менеджер слайсов
func NewSliceManager() *SliceManager {
	return &SliceManager{
		tupleManager: NewTupleManager(),
	}
}

// CreateSlice создаёт новый слайс в указанном таппле
func (sm *SliceManager) CreateSlice(tapple *types.Tapple, name string) (*types.Slice, error) {
	if tapple == nil {
		return nil, errors.New("tapple is nil")
	}

	tapple.RLock()
	_, exists := tapple.Slices[name]
	tapple.RUnlock()
	
	if exists {
		return nil, errors.New("slice already exists")
	}

	slice := types.NewSlice(name)

	tapple.Lock()
	tapple.Slices[name] = slice
	tapple.Unlock()

	atomic.AddInt64(&sm.stats.created, 1)
	
	logger := utils.GetLogger()
	if logger != nil {
		logger.Log("INFO", "Created slice: "+name)
	}

	return slice, nil
}

// GetSlice возвращает слайс по имени
func (sm *SliceManager) GetSlice(tapple *types.Tapple, name string) (*types.Slice, error) {
	if tapple == nil {
		return nil, errors.New("tapple is nil")
	}

	tapple.RLock()
	slice, exists := tapple.Slices[name]
	tapple.RUnlock()

	if !exists {
		return nil, errors.New("slice not found")
	}

	return slice, nil
}

// DeleteSlice удаляет слайс
func (sm *SliceManager) DeleteSlice(tapple *types.Tapple, name string) error {
	if tapple == nil {
		return errors.New("tapple is nil")
	}

	tapple.Lock()
	_, exists := tapple.Slices[name]
	if !exists {
		tapple.Unlock()
		return errors.New("slice not found")
	}

	delete(tapple.Slices, name)
	tapple.Unlock()

	atomic.AddInt64(&sm.stats.deleted, 1)
	
	logger := utils.GetLogger()
	if logger != nil {
		logger.Log("INFO", "Deleted slice: "+name)
	}

	return nil
}

// ListSlices возвращает список всех слайсов в таппле
func (sm *SliceManager) ListSlices(tapple *types.Tapple) []string {
	if tapple == nil {
		return nil
	}

	tapple.RLock()
	defer tapple.RUnlock()

	slices := make([]string, 0, len(tapple.Slices))
	for name := range tapple.Slices {
		slices = append(slices, name)
	}
	return slices
}

// GetTupleManager возвращает менеджер кортежей
func (sm *SliceManager) GetTupleManager() *TupleManager {
	return sm.tupleManager
}