package engine

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

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

// Helper function to convert sql.NullString to string
func getStringFromNullString(ns sql.NullString) string {
	if ns.Valid {
		return ns.String
	}
	return ""
}

// DatabaseClient implements ContentClient interface using the database
type DatabaseClient struct {
	database *db.Database
}

// NewDatabaseClient creates a new database client
func NewDatabaseClient(database *db.Database) *DatabaseClient {
	return &DatabaseClient{
		database: database,
	}
}

// GetContent retrieves a single content item
func (c *DatabaseClient) GetContent(siteID, contentID string) (*ContentItem, error) {
	switch c.database.GetDBType() {
	case "sqlite3":
		content, err := c.database.GetSQLiteQueries().GetContent(context.Background(), 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),
			Type:             content.Type,
			LastEditedBy:     content.LastEditedBy,
		}, nil

	case "postgresql":
		content, err := c.database.GetPostgreSQLQueries().GetContent(context.Background(), postgresql.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),
			Type:             content.Type,
			LastEditedBy:     content.LastEditedBy,
		}, nil

	default:
		return nil, fmt.Errorf("unsupported database type: %s", c.database.GetDBType())
	}
}

// GetBulkContent retrieves multiple content items
func (c *DatabaseClient) GetBulkContent(siteID string, contentIDs []string) (map[string]ContentItem, error) {
	switch c.database.GetDBType() {
	case "sqlite3":
		contents, err := c.database.GetSQLiteQueries().GetBulkContent(context.Background(), 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),
				Type:             content.Type,
				LastEditedBy:     content.LastEditedBy,
			}
		}
		return items, nil

	case "postgresql":
		contents, err := c.database.GetPostgreSQLQueries().GetBulkContent(context.Background(), postgresql.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),
				Type:             content.Type,
				LastEditedBy:     content.LastEditedBy,
			}
		}
		return items, nil

	default:
		return nil, fmt.Errorf("unsupported database type: %s", c.database.GetDBType())
	}
}

// GetAllContent retrieves all content items for a site
func (c *DatabaseClient) GetAllContent(siteID string) (map[string]ContentItem, error) {
	switch c.database.GetDBType() {
	case "sqlite3":
		contents, err := c.database.GetSQLiteQueries().GetAllContent(context.Background(), 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),
				Type:             content.Type,
				LastEditedBy:     content.LastEditedBy,
			}
		}
		return items, nil

	case "postgresql":
		contents, err := c.database.GetPostgreSQLQueries().GetAllContent(context.Background(), 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),
				Type:             content.Type,
				LastEditedBy:     content.LastEditedBy,
			}
		}
		return items, nil

	default:
		return nil, fmt.Errorf("unsupported database type: %s", c.database.GetDBType())
	}
}

// CreateContent creates a new content item
func (c *DatabaseClient) CreateContent(siteID, contentID, htmlContent, originalTemplate, contentType, lastEditedBy string) (*ContentItem, error) {
	switch c.database.GetDBType() {
	case "sqlite3":
		content, err := c.database.GetSQLiteQueries().CreateContent(context.Background(), sqlite.CreateContentParams{
			ID:               contentID,
			SiteID:           siteID,
			HtmlContent:      htmlContent,
			OriginalTemplate: toNullString(originalTemplate),
			Type:             contentType,
			LastEditedBy:     lastEditedBy,
		})
		if err != nil {
			return nil, err
		}
		return &ContentItem{
			ID:               content.ID,
			SiteID:           content.SiteID,
			HTMLContent:      content.HtmlContent,
			OriginalTemplate: getStringFromNullString(content.OriginalTemplate),
			Type:             content.Type,
			LastEditedBy:     content.LastEditedBy,
		}, nil

	case "postgresql":
		content, err := c.database.GetPostgreSQLQueries().CreateContent(context.Background(), postgresql.CreateContentParams{
			ID:               contentID,
			SiteID:           siteID,
			HtmlContent:      htmlContent,
			OriginalTemplate: toNullString(originalTemplate),
			Type:             contentType,
			LastEditedBy:     lastEditedBy,
		})
		if err != nil {
			return nil, err
		}
		return &ContentItem{
			ID:               content.ID,
			SiteID:           content.SiteID,
			HTMLContent:      content.HtmlContent,
			OriginalTemplate: getStringFromNullString(content.OriginalTemplate),
			Type:             content.Type,
			LastEditedBy:     content.LastEditedBy,
		}, nil

	default:
		return nil, fmt.Errorf("unsupported database type: %s", c.database.GetDBType())
	}
}

// Helper function to convert string to sql.NullString  
func toNullString(s string) sql.NullString {
	if s == "" {
		return sql.NullString{Valid: false}
	}
	return sql.NullString{String: s, Valid: true}
}