package database

import (
	"fmt"
	"os"
	"path/filepath"

	"github.com/novablog/server/internal/config"
	"github.com/novablog/server/internal/models"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

var DB *gorm.DB

// Initialize 初始化数据库连接
func Initialize(cfg *config.Config) error {
	var err error

	// 确保数据目录存在
	dbDir := filepath.Dir(cfg.Database.Path)
	if err := os.MkdirAll(dbDir, 0755); err != nil {
		return fmt.Errorf("failed to create database directory: %w", err)
	}

	// 连接 SQLite 数据库
	DB, err = gorm.Open(sqlite.Open(cfg.Database.Path), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Info),
	})
	if err != nil {
		return fmt.Errorf("failed to connect database: %w", err)
	}

	// 自动迁移数据库表
	if err := autoMigrate(); err != nil {
		return fmt.Errorf("failed to migrate database: %w", err)
	}

	return nil
}

// autoMigrate 自动迁移数据库表结构
func autoMigrate() error {
	return DB.AutoMigrate(
		&models.User{},
		&models.Comment{},
		&models.Like{},
		&models.LikeCount{},
		&models.PostMeta{},
	)
}

// Close 关闭数据库连接
func Close() error {
	sqlDB, err := DB.DB()
	if err != nil {
		return err
	}
	return sqlDB.Close()
}