package config

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

	"github.com/joho/godotenv"
	"gorm.io/driver/mysql"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

var DB *gorm.DB

// JWTSecret is the secret key used for signing JWT tokens
var JWTSecret = "your-secret-key" // Default value, should be set via JWT_SECRET environment variable in production

// LoadEnvFile 从可执行文件同级目录加载 .env 文件
func LoadEnvFile() {
	// 获取可执行文件路径
	execPath, err := os.Executable()
	if err != nil {
		log.Printf("Warning: Failed to get executable path: %v. Using current working directory.", err)
		// 如果获取可执行文件路径失败，使用当前工作目录
		if err := godotenv.Load(".env"); err != nil {
			log.Printf("Info: .env file not found in current directory: %v", err)
		} else {
			log.Println("Loaded .env file from current directory")
		}
		return
	}

	// 获取可执行文件所在目录
	execDir := filepath.Dir(execPath)
	envPath := filepath.Join(execDir, ".env")

	// 检查 .env 文件是否存在
	if _, err := os.Stat(envPath); os.IsNotExist(err) {
		log.Printf("Info: .env file not found at %s, using environment variables or defaults", envPath)
		return
	}

	// 加载 .env 文件
	if err := godotenv.Load(envPath); err != nil {
		log.Printf("Warning: Failed to load .env file from %s: %v", envPath, err)
	} else {
		log.Printf("Loaded .env file from %s", envPath)
	}
}

func InitDB() {
	var err error

	// Try to get DSN from environment variable, otherwise use default
	dsn := os.Getenv("DB_DSN")
	if dsn == "" {
		dsn = "root:root@tcp(127.0.0.1:3306)/nl_blog?charset=utf8mb4&parseTime=True&loc=Local"
		//dsn = "root:mysql_PKC65h@tcp(127.0.0.1:3306)/nl_blog?charset=utf8mb4&parseTime=True&loc=Local"
	}

	// Try to get JWT secret from environment variable
	if secret := os.Getenv("JWT_SECRET"); secret != "" {
		JWTSecret = secret
	}

	DB, err = gorm.Open(mysql.Open(dsn), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent), // 禁用 GORM 日志，使用自定义日志
		// 不使用 NowFunc，因为我们使用模型钩子手动处理 int64 时间戳
	})
	if err != nil {
		log.Fatal("Failed to connect to database:", err)
	}

	sqlDB, err := DB.DB()
	if err != nil {
		log.Fatal("Failed to get underlying sql.DB:", err)
	}

	if err = sqlDB.Ping(); err != nil {
		log.Fatal("Failed to ping database:", err)
	}

	fmt.Println("Database connected successfully")
}

func CloseDB() {
	if DB != nil {
		sqlDB, err := DB.DB()
		if err == nil {
			sqlDB.Close()
		}
	}
}