package database

import (
	"ankao/internal/models"
	"ankao/pkg/config"
	"fmt"
	"log"

	"gorm.io/driver/postgres"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

var DB *gorm.DB

// InitDB 初始化数据库连接
func InitDB() error {
	cfg := config.GetDatabaseConfig()
	dsn := cfg.GetDSN()

	var err error
	DB, err = gorm.Open(postgres.Open(dsn), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Info), // 开启SQL日志
	})
	if err != nil {
		return fmt.Errorf("failed to connect to database: %w", err)
	}

	log.Println("Database connected successfully")

	// 自动迁移数据库表结构
	err = DB.AutoMigrate(
		&models.User{},
		&models.PracticeQuestion{},
	)
	if err != nil {
		return fmt.Errorf("failed to migrate database: %w", err)
	}

	log.Println("Database migration completed")

	return nil
}

// GetDB 获取数据库实例
func GetDB() *gorm.DB {
	return DB
}