package config

import (
	"log"
	"os"
	"strconv"
	"time"

	"github.com/joho/godotenv"
)

type Config struct {
	Server     ServerConfig
	Database   DatabaseConfig
	JWT        JWTConfig
	ShortVideo ShortVideoConfig
	Qiniu      QiniuConfig
}

type ServerConfig struct {
	Port string
	Mode string
}

type DatabaseConfig struct {
	Host     string
	Port     string
	User     string
	Password string
	DBName   string
}

type JWTConfig struct {
	Secret string
	Expire int
}

type ShortVideoConfig struct {
	APIKey         string
	FreeDailyQuota int
	RequestTimeout time.Duration
}

// QiniuConfig 用于七牛云（Kodo）直传相关配置。
// 前端通常会向后端请求 upload token，然后直传文件到七牛。
type QiniuConfig struct {
	AccessKey          string
	SecretKey          string
	Bucket             string
	UploadURL          string
	CDNDomain          string
	KeyPrefix          string
	TokenExpireSeconds int
}

var AppConfig *Config

func LoadConfig() {
	// 加载 .env 文件
	if err := godotenv.Load(); err != nil {
		log.Println("未找到 .env 文件，使用环境变量")
	}

	AppConfig = &Config{
		Server: ServerConfig{
			Port: getEnv("SERVER_PORT", "8080"),
			Mode: getEnv("GIN_MODE", "debug"),
		},
		Database: DatabaseConfig{
			Host:     getEnv("DB_HOST", "localhost"),
			Port:     getEnv("DB_PORT", "3306"),
			User:     getEnv("DB_USER", "root"),
			Password: getEnv("DB_PASSWORD", ""),
			DBName:   getEnv("DB_NAME", "wx_service"),
		},
		JWT: JWTConfig{
			Secret: getEnv("JWT_SECRET", "your-secret-key"),
			Expire: 86400, // 24小时
		},
		ShortVideo: ShortVideoConfig{
			APIKey:         getEnv("SHORT_VIDEO_API_KEY", ""),
			FreeDailyQuota: getEnvAsInt("SHORT_VIDEO_FREE_QUOTA", 20),
			RequestTimeout: time.Duration(getEnvAsInt("SHORT_VIDEO_TIMEOUT_SECONDS", 5)) * time.Second,
		},
		Qiniu: QiniuConfig{
			AccessKey:          getEnv("QINIU_ACCESS_KEY", ""),
			SecretKey:          getEnv("QINIU_SECRET_KEY", ""),
			Bucket:             getEnv("QINIU_BUCKET", ""),
			UploadURL:          getEnv("QINIU_UPLOAD_URL", "https://upload.qiniup.com"),
			CDNDomain:          getEnv("QINIU_CDN_DOMAIN", ""),
			KeyPrefix:          getEnv("QINIU_KEY_PREFIX", "uploads/"),
			TokenExpireSeconds: getEnvAsInt("QINIU_TOKEN_EXPIRE_SECONDS", 300),
		},
	}
}

func getEnv(key, defaultValue string) string {
	if value := os.Getenv(key); value != "" {
		return value
	}
	return defaultValue
}

func getEnvAsInt(key string, defaultValue int) int {
	if value := os.Getenv(key); value != "" {
		if v, err := strconv.Atoi(value); err == nil {
			return v
		}
	}
	return defaultValue
}