package db

import (
	"context"
	"database/sql"
	"fmt"

	"github.com/insertr/insertr/internal/db/sqlite"
)

// SQLiteRepository implements ContentRepository for SQLite databases
type SQLiteRepository struct {
	queries *sqlite.Queries
	db      *sql.DB
}

// NewSQLiteRepository creates a new SQLite repository
func NewSQLiteRepository(db *sql.DB) *SQLiteRepository {
	return &SQLiteRepository{
		queries: sqlite.New(db),
		db:      db,
	}
}

// GetContent retrieves a single content item
func (r *SQLiteRepository) GetContent(ctx context.Context, siteID, contentID string) (*ContentItem, error) {
	content, err := r.queries.GetContent(ctx, sqlite.GetContentParams{
		ID:     contentID,
		SiteID: siteID,
	})
	if err != nil {
		return nil, err
	}
	return &ContentItem{
		ID:               content.ID,
		SiteID:           content.SiteID,
		HTMLContent:      content.HtmlContent,
		OriginalTemplate: getStringFromNullString(content.OriginalTemplate),
		LastEditedBy:     content.LastEditedBy,
	}, nil
}

// GetBulkContent retrieves multiple content items
func (r *SQLiteRepository) GetBulkContent(ctx context.Context, siteID string, contentIDs []string) (map[string]ContentItem, error) {
	contents, err := r.queries.GetBulkContent(ctx, sqlite.GetBulkContentParams{
		SiteID: siteID,
		Ids:    contentIDs,
	})
	if err != nil {
		return nil, err
	}

	items := make(map[string]ContentItem)
	for _, content := range contents {
		items[content.ID] = ContentItem{
			ID:               content.ID,
			SiteID:           content.SiteID,
			HTMLContent:      content.HtmlContent,
			OriginalTemplate: getStringFromNullString(content.OriginalTemplate),
			LastEditedBy:     content.LastEditedBy,
		}
	}
	return items, nil
}

// GetAllContent retrieves all content items for a site
func (r *SQLiteRepository) GetAllContent(ctx context.Context, siteID string) (map[string]ContentItem, error) {
	contents, err := r.queries.GetAllContent(ctx, siteID)
	if err != nil {
		return nil, err
	}

	items := make(map[string]ContentItem)
	for _, content := range contents {
		items[content.ID] = ContentItem{
			ID:               content.ID,
			SiteID:           content.SiteID,
			HTMLContent:      content.HtmlContent,
			OriginalTemplate: getStringFromNullString(content.OriginalTemplate),
			LastEditedBy:     content.LastEditedBy,
		}
	}
	return items, nil
}

// CreateContent creates a new content item
func (r *SQLiteRepository) CreateContent(ctx context.Context, siteID, contentID, htmlContent, originalTemplate, lastEditedBy string) (*ContentItem, error) {
	content, err := r.queries.CreateContent(ctx, sqlite.CreateContentParams{
		ID:               contentID,
		SiteID:           siteID,
		HtmlContent:      htmlContent,
		OriginalTemplate: ToNullString(originalTemplate),
		LastEditedBy:     lastEditedBy,
	})
	if err != nil {
		return nil, err
	}
	return &ContentItem{
		ID:               content.ID,
		SiteID:           content.SiteID,
		HTMLContent:      content.HtmlContent,
		OriginalTemplate: getStringFromNullString(content.OriginalTemplate),
		LastEditedBy:     content.LastEditedBy,
	}, nil
}

// GetCollection retrieves a collection container
func (r *SQLiteRepository) GetCollection(ctx context.Context, siteID, collectionID string) (*CollectionItem, error) {
	collection, err := r.queries.GetCollection(ctx, sqlite.GetCollectionParams{
		ID:     collectionID,
		SiteID: siteID,
	})
	if err != nil {
		return nil, err
	}
	return &CollectionItem{
		ID:            collection.ID,
		SiteID:        collection.SiteID,
		ContainerHTML: collection.ContainerHtml,
		LastEditedBy:  collection.LastEditedBy,
	}, nil
}

// CreateCollection creates a new collection container
func (r *SQLiteRepository) CreateCollection(ctx context.Context, siteID, collectionID, containerHTML, lastEditedBy string) (*CollectionItem, error) {
	collection, err := r.queries.CreateCollection(ctx, sqlite.CreateCollectionParams{
		ID:            collectionID,
		SiteID:        siteID,
		ContainerHtml: containerHTML,
		LastEditedBy:  lastEditedBy,
	})
	if err != nil {
		return nil, err
	}
	return &CollectionItem{
		ID:            collection.ID,
		SiteID:        collection.SiteID,
		ContainerHTML: collection.ContainerHtml,
		LastEditedBy:  collection.LastEditedBy,
	}, nil
}

// GetCollectionItems retrieves all items in a collection with template information
func (r *SQLiteRepository) GetCollectionItems(ctx context.Context, siteID, collectionID string) ([]CollectionItemWithTemplate, error) {
	items, err := r.queries.GetCollectionItemsWithTemplate(ctx, sqlite.GetCollectionItemsWithTemplateParams{
		CollectionID: collectionID,
		SiteID:       siteID,
	})
	if err != nil {
		return nil, err
	}

	result := make([]CollectionItemWithTemplate, len(items))
	for i, item := range items {
		result[i] = CollectionItemWithTemplate{
			ItemID:       item.ItemID,
			CollectionID: item.CollectionID,
			SiteID:       item.SiteID,
			TemplateID:   int(item.TemplateID),
			HTMLContent:  item.HtmlContent,
			Position:     int(item.Position),
			LastEditedBy: item.LastEditedBy,
			TemplateName: item.TemplateName,
			HTMLTemplate: item.HtmlTemplate,
			IsDefault:    item.IsDefault != 0, // SQLite uses INTEGER for boolean
		}
	}
	return result, nil
}

// CreateCollectionTemplate creates a new template for a collection
func (r *SQLiteRepository) CreateCollectionTemplate(ctx context.Context, siteID, collectionID, name, htmlTemplate string, isDefault bool) (*CollectionTemplateItem, error) {
	var isDefaultInt int64
	if isDefault {
		isDefaultInt = 1
	}

	template, err := r.queries.CreateCollectionTemplate(ctx, sqlite.CreateCollectionTemplateParams{
		CollectionID: collectionID,
		SiteID:       siteID,
		Name:         name,
		HtmlTemplate: htmlTemplate,
		IsDefault:    isDefaultInt,
	})
	if err != nil {
		return nil, err
	}
	return &CollectionTemplateItem{
		TemplateID:   int(template.TemplateID),
		CollectionID: template.CollectionID,
		SiteID:       template.SiteID,
		Name:         template.Name,
		HTMLTemplate: template.HtmlTemplate,
		IsDefault:    template.IsDefault != 0,
	}, nil
}

// GetCollectionTemplates retrieves all templates for a collection
func (r *SQLiteRepository) GetCollectionTemplates(ctx context.Context, siteID, collectionID string) ([]CollectionTemplateItem, error) {
	templates, err := r.queries.GetCollectionTemplates(ctx, sqlite.GetCollectionTemplatesParams{
		CollectionID: collectionID,
		SiteID:       siteID,
	})
	if err != nil {
		return nil, err
	}

	result := make([]CollectionTemplateItem, len(templates))
	for i, template := range templates {
		result[i] = CollectionTemplateItem{
			TemplateID:   int(template.TemplateID),
			CollectionID: template.CollectionID,
			SiteID:       template.SiteID,
			Name:         template.Name,
			HTMLTemplate: template.HtmlTemplate,
			IsDefault:    template.IsDefault != 0, // SQLite uses INTEGER for boolean
		}
	}
	return result, nil
}

// GetCollectionTemplate retrieves a single template by ID
func (r *SQLiteRepository) GetCollectionTemplate(ctx context.Context, templateID int) (*CollectionTemplateItem, error) {
	template, err := r.queries.GetCollectionTemplate(ctx, int64(templateID))
	if err != nil {
		return nil, err
	}

	result := &CollectionTemplateItem{
		TemplateID:   int(template.TemplateID),
		CollectionID: template.CollectionID,
		SiteID:       template.SiteID,
		Name:         template.Name,
		HTMLTemplate: template.HtmlTemplate,
		IsDefault:    template.IsDefault != 0, // SQLite uses INTEGER for boolean
	}
	return result, nil
}

// CreateCollectionItem creates a new collection item
func (r *SQLiteRepository) CreateCollectionItem(ctx context.Context, siteID, collectionID, itemID string, templateID int, htmlContent string, position int, lastEditedBy string) (*CollectionItemWithTemplate, error) {
	item, err := r.queries.CreateCollectionItem(ctx, sqlite.CreateCollectionItemParams{
		ItemID:       itemID,
		CollectionID: collectionID,
		SiteID:       siteID,
		TemplateID:   int64(templateID),
		HtmlContent:  htmlContent,
		Position:     int64(position),
		LastEditedBy: lastEditedBy,
	})
	if err != nil {
		return nil, err
	}
	return &CollectionItemWithTemplate{
		ItemID:       item.ItemID,
		CollectionID: item.CollectionID,
		SiteID:       item.SiteID,
		TemplateID:   int(item.TemplateID),
		HTMLContent:  item.HtmlContent,
		Position:     int(item.Position),
		LastEditedBy: item.LastEditedBy,
	}, nil
}

// CreateCollectionItemAtomic creates a collection item with all its content entries atomically
func (r *SQLiteRepository) CreateCollectionItemAtomic(ctx context.Context, siteID, collectionID string, templateID int, lastEditedBy string) (*CollectionItemWithTemplate, error) {
	// Get template HTML for processing
	templates, err := r.GetCollectionTemplates(ctx, siteID, collectionID)
	if err != nil {
		return nil, fmt.Errorf("failed to get templates: %w", err)
	}

	var templateHTML string
	for _, template := range templates {
		if template.TemplateID == templateID {
			templateHTML = template.HTMLTemplate
			break
		}
	}

	if templateHTML == "" {
		return nil, fmt.Errorf("template %d not found", templateID)
	}

	// TODO: Implement using unified engine approach
	// This requires circular dependency resolution
	return nil, fmt.Errorf("CreateCollectionItemAtomic not yet implemented for SQLite")
}

// GetMaxPosition returns the maximum position for items in a collection
func (r *SQLiteRepository) GetMaxPosition(ctx context.Context, siteID, collectionID string) (int, error) {
	result, err := r.queries.GetMaxPosition(ctx, sqlite.GetMaxPositionParams{
		CollectionID: collectionID,
		SiteID:       siteID,
	})
	if err != nil {
		return 0, err
	}

	// Convert interface{} to int (SQLite returns int64)
	if maxPos, ok := result.(int64); ok {
		return int(maxPos), nil
	}
	return 0, nil
}

// UpdateContent updates an existing content item
func (r *SQLiteRepository) UpdateContent(ctx context.Context, siteID, contentID, htmlContent, lastEditedBy string) (*ContentItem, error) {
	content, err := r.queries.UpdateContent(ctx, sqlite.UpdateContentParams{
		HtmlContent:  htmlContent,
		LastEditedBy: lastEditedBy,
		ID:           contentID,
		SiteID:       siteID,
	})
	if err != nil {
		return nil, err
	}

	return &ContentItem{
		ID:               content.ID,
		SiteID:           content.SiteID,
		HTMLContent:      content.HtmlContent,
		OriginalTemplate: FromNullString(content.OriginalTemplate),
		UpdatedAt:        fmt.Sprintf("%d", content.UpdatedAt),
		LastEditedBy:     content.LastEditedBy,
	}, nil
}

// ReorderCollectionItems reorders collection items in bulk
func (r *SQLiteRepository) ReorderCollectionItems(ctx context.Context, siteID, collectionID string, items []CollectionItemPosition, lastEditedBy string) error {
	// Use transaction for atomic bulk updates
	tx, err := r.db.BeginTx(ctx, nil)
	if err != nil {
		return err
	}
	defer tx.Rollback()

	qtx := r.queries.WithTx(tx)
	for _, item := range items {
		err = qtx.UpdateCollectionItemPosition(ctx, sqlite.UpdateCollectionItemPositionParams{
			ItemID:       item.ItemID,
			CollectionID: collectionID,
			SiteID:       siteID,
			Position:     int64(item.Position),
			LastEditedBy: lastEditedBy,
		})
		if err != nil {
			return fmt.Errorf("failed to update position for item %s: %w", item.ItemID, err)
		}
	}

	return tx.Commit()
}

// WithTransaction executes a function within a database transaction
func (r *SQLiteRepository) WithTransaction(ctx context.Context, fn func(ContentRepository) error) error {
	tx, err := r.db.BeginTx(ctx, nil)
	if err != nil {
		return err
	}

	txRepo := &SQLiteRepository{
		queries: r.queries.WithTx(tx),
		db:      r.db,
	}

	if err := fn(txRepo); err != nil {
		tx.Rollback()
		return err
	}

	return tx.Commit()
}