package localdb

import (
	"time"

	"git.mchus.pro/mchus/priceforge/internal/models"
)

// ConfigurationToLocal converts models.Configuration to LocalConfiguration
func ConfigurationToLocal(cfg *models.Configuration) *LocalConfiguration {
	items := make(LocalConfigItems, len(cfg.Items))
	for i, item := range cfg.Items {
		items[i] = LocalConfigItem{
			LotName:   item.LotName,
			Quantity:  item.Quantity,
			UnitPrice: item.UnitPrice,
		}
	}

	local := &LocalConfiguration{
		UUID:             cfg.UUID,
		ProjectUUID:      cfg.ProjectUUID,
		IsActive:         true,
		Name:             cfg.Name,
		Items:            items,
		TotalPrice:       cfg.TotalPrice,
		CustomPrice:      cfg.CustomPrice,
		Notes:            cfg.Notes,
		IsTemplate:       cfg.IsTemplate,
		ServerCount:      cfg.ServerCount,
		PricelistID:      cfg.PricelistID,
		OnlyInStock:      cfg.OnlyInStock,
		PriceUpdatedAt:   cfg.PriceUpdatedAt,
		CreatedAt:        cfg.CreatedAt,
		UpdatedAt:        time.Now(),
		SyncStatus:       "pending",
		OriginalUserID:   derefUint(cfg.UserID),
		OriginalUsername: cfg.OwnerUsername,
	}

	if local.OriginalUsername == "" && cfg.User != nil {
		local.OriginalUsername = cfg.User.Username
	}

	if cfg.ID > 0 {
		serverID := cfg.ID
		local.ServerID = &serverID
	}

	return local
}

// LocalToConfiguration converts LocalConfiguration to models.Configuration
func LocalToConfiguration(local *LocalConfiguration) *models.Configuration {
	items := make(models.ConfigItems, len(local.Items))
	for i, item := range local.Items {
		items[i] = models.ConfigItem{
			LotName:   item.LotName,
			Quantity:  item.Quantity,
			UnitPrice: item.UnitPrice,
		}
	}

	cfg := &models.Configuration{
		UUID:           local.UUID,
		OwnerUsername:  local.OriginalUsername,
		ProjectUUID:    local.ProjectUUID,
		Name:           local.Name,
		Items:          items,
		TotalPrice:     local.TotalPrice,
		CustomPrice:    local.CustomPrice,
		Notes:          local.Notes,
		IsTemplate:     local.IsTemplate,
		ServerCount:    local.ServerCount,
		PricelistID:    local.PricelistID,
		OnlyInStock:    local.OnlyInStock,
		PriceUpdatedAt: local.PriceUpdatedAt,
		CreatedAt:      local.CreatedAt,
	}

	if local.ServerID != nil {
		cfg.ID = *local.ServerID
	}
	if local.OriginalUserID != 0 {
		userID := local.OriginalUserID
		cfg.UserID = &userID
	}

	return cfg
}

func derefUint(v *uint) uint {
	if v == nil {
		return 0
	}
	return *v
}

func ProjectToLocal(project *models.Project) *LocalProject {
	local := &LocalProject{
		UUID:          project.UUID,
		OwnerUsername: project.OwnerUsername,
		Name:          project.Name,
		TrackerURL:    project.TrackerURL,
		IsActive:      project.IsActive,
		IsSystem:      project.IsSystem,
		CreatedAt:     project.CreatedAt,
		UpdatedAt:     project.UpdatedAt,
		SyncStatus:    "pending",
	}
	if project.ID > 0 {
		serverID := project.ID
		local.ServerID = &serverID
	}
	return local
}

func LocalToProject(local *LocalProject) *models.Project {
	project := &models.Project{
		UUID:          local.UUID,
		OwnerUsername: local.OwnerUsername,
		Name:          local.Name,
		TrackerURL:    local.TrackerURL,
		IsActive:      local.IsActive,
		IsSystem:      local.IsSystem,
		CreatedAt:     local.CreatedAt,
		UpdatedAt:     local.UpdatedAt,
	}
	if local.ServerID != nil {
		project.ID = *local.ServerID
	}
	return project
}

// PricelistToLocal converts models.Pricelist to LocalPricelist
func PricelistToLocal(pl *models.Pricelist) *LocalPricelist {
	name := pl.Notification
	if name == "" {
		name = pl.Version
	}

	return &LocalPricelist{
		ServerID:  pl.ID,
		Source:    pl.Source,
		Version:   pl.Version,
		Name:      name,
		CreatedAt: pl.CreatedAt,
		SyncedAt:  time.Now(),
		IsUsed:    false,
	}
}

// LocalToPricelist converts LocalPricelist to models.Pricelist
func LocalToPricelist(local *LocalPricelist) *models.Pricelist {
	return &models.Pricelist{
		ID:           local.ServerID,
		Source:       local.Source,
		Version:      local.Version,
		Notification: local.Name,
		CreatedAt:    local.CreatedAt,
		IsActive:     true,
	}
}

// PricelistItemToLocal converts models.PricelistItem to LocalPricelistItem
func PricelistItemToLocal(item *models.PricelistItem, localPricelistID uint) *LocalPricelistItem {
	partnumbers := make(LocalStringList, 0, len(item.Partnumbers))
	partnumbers = append(partnumbers, item.Partnumbers...)
	return &LocalPricelistItem{
		PricelistID:  localPricelistID,
		LotName:      item.LotName,
		Price:        item.Price,
		AvailableQty: item.AvailableQty,
		Partnumbers:  partnumbers,
	}
}

// LocalToPricelistItem converts LocalPricelistItem to models.PricelistItem
func LocalToPricelistItem(local *LocalPricelistItem, serverPricelistID uint) *models.PricelistItem {
	partnumbers := make([]string, 0, len(local.Partnumbers))
	partnumbers = append(partnumbers, local.Partnumbers...)
	return &models.PricelistItem{
		ID:           local.ID,
		PricelistID:  serverPricelistID,
		LotName:      local.LotName,
		Price:        local.Price,
		AvailableQty: local.AvailableQty,
		Partnumbers:  partnumbers,
	}
}

// ComponentToLocal converts models.LotMetadata to LocalComponent
func ComponentToLocal(meta *models.LotMetadata) *LocalComponent {
	var lotDesc string
	var category string

	if meta.Lot != nil {
		lotDesc = meta.Lot.LotDescription
	}

	// Extract category from lot_name (e.g., "CPU_AMD_9654" -> "CPU")
	if len(meta.LotName) > 0 {
		for i, ch := range meta.LotName {
			if ch == '_' {
				category = meta.LotName[:i]
				break
			}
		}
	}

	return &LocalComponent{
		LotName:        meta.LotName,
		LotDescription: lotDesc,
		Category:       category,
		Model:          meta.Model,
		CurrentPrice:   meta.CurrentPrice,
		SyncedAt:       time.Now(),
	}
}

// LocalToComponent converts LocalComponent to models.LotMetadata
func LocalToComponent(local *LocalComponent) *models.LotMetadata {
	return &models.LotMetadata{
		LotName:      local.LotName,
		Model:        local.Model,
		CurrentPrice: local.CurrentPrice,
		Lot: &models.Lot{
			LotName:        local.LotName,
			LotDescription: local.LotDescription,
		},
	}
}