package config

import (
	"fmt"
	"os"
	"strconv"
)

// Config 网关配置
type Config struct {
	Server          ServerConfig
	Dubbo           DubboConfig
	JWT             JWTConfig
	OSS             OSSConfig
	Segment         SegmentConfig
	Dify            DifyConfig
	Minimax         MinimaxConfig
	LaserCompositor LaserCompositorConfig
	Redis           RedisConfig
	DB              DBConfig
	WebSocket       WebSocketConfig
	Root            string
}

// MinimaxConfig MiniMax 图像生成配置
type MinimaxConfig struct {
	APIKey string // MiniMax API 密钥
	APIURL string // 默认 https://api.minimaxi.com/v1/image_generation
}

// LaserCompositorConfig laser-compositor 合成服务配置
type LaserCompositorConfig struct {
	URL string // 默认 http://127.0.0.1:7000
}

// DifyConfig Dify 工作流配置
type DifyConfig struct {
	APIBase string
	APIKey  string
}

// RedisConfig Redis 配置
type RedisConfig struct {
	Host     string
	Port     int
	Password string
	DB       int
}

// DBConfig 数据库配置
type DBConfig struct {
	Host     string
	Port     int
	User     string
	Password string
	DBName   string
	SSLMode  string
	TimeZone string
}

// ServerConfig 服务器配置
type ServerConfig struct {
	Port string
	Mode string // debug, release, test
}

// DubboConfig Dubbo 服务配置
type DubboConfig struct {
	UserServiceURL     string
	SocialServiceURL    string
	AssetServiceURL     string
	GalleryServiceURL   string
	ActivityServiceURL  string
	TaskServiceURL      string
	StarbookServiceURL  string
	AIChatServiceURL    string
}

// JWTConfig JWT 配置
type JWTConfig struct {
	Secret string
}

// SegmentConfig 人像抠图（服务端代理）
type SegmentConfig struct {
	Provider     string // auto | imageseg | viapi | ivpd | http
	InferenceURL string // 自部署 rembg 等 HTTP 地址，如 http://127.0.0.1:7000/api/remove
}

// OSSConfig OSS 配置
type OSSConfig struct {
	Region          string
	BucketName      string
	RoleArn         string
	AccessKeyID     string
	AccessKeySecret string
	AvatarDir       string // 头像上传目录，如 "avatar/"
	AssetDir        string // 资产上传目录，如 "asset/"
	TokenExpireTime int    // Token 过期时间（秒），默认 3600
}

// GetUploadDir 根据类型获取上传目录
func (c *OSSConfig) GetUploadDir(uploadType string) string {
	switch uploadType {
	case "avatar":
		return c.AvatarDir
	case "asset":
		return c.AssetDir
	default:
		return c.AssetDir // 默认使用 asset 目录
	}
}

// WebSocketConfig WebSocket 配置
type WebSocketConfig struct {
	AIChatPath string // WebSocket 路径，默认 /ws/ai-chat
}

// Load 加载配置
func Load() *Config {
	root, _ := os.Getwd()
	return &Config{
		Root: root,
		Server: ServerConfig{
			Port: getEnv("SERVER_PORT", "8080"),
			Mode: getEnv("GIN_MODE", "debug"),
		},
		Dubbo: DubboConfig{
			UserServiceURL:     getEnv("DUBBO_USER_SERVICE_URL", "tri://127.0.0.1:20000"),
			SocialServiceURL:    getEnv("DUBBO_SOCIAL_SERVICE_URL", "tri://127.0.0.1:20002"),
			AssetServiceURL:     getEnv("DUBBO_ASSET_SERVICE_URL", "tri://127.0.0.1:20003"),
			GalleryServiceURL:   getEnv("DUBBO_GALLERY_SERVICE_URL", "tri://127.0.0.1:20004"),
			ActivityServiceURL:  getEnv("DUBBO_ACTIVITY_SERVICE_URL", "tri://127.0.0.1:20005"),
			TaskServiceURL:      getEnv("DUBBO_TASK_SERVICE_URL", "tri://127.0.0.1:20006"),
			StarbookServiceURL:  getEnv("DUBBO_STARBOOK_SERVICE_URL", "tri://127.0.0.1:20007"),
			AIChatServiceURL:    getEnv("DUBBO_AI_CHAT_SERVICE_URL", "tri://127.0.0.1:20008"),
		},
		JWT: JWTConfig{
			Secret: getEnv("JWT_SECRET", ""),
		},
		OSS: OSSConfig{
			Region:          getEnv("OSS_REGION", "cn-shanghai"),
			BucketName:      getEnv("OSS_BUCKET_NAME", ""),
			RoleArn:         getEnv("OSS_STS_ROLE_ARN", ""),
			AccessKeyID:     getEnv("OSS_ACCESS_KEY_ID", ""),
			AccessKeySecret: getEnv("OSS_ACCESS_KEY_SECRET", ""),
			AvatarDir:       getEnv("OSS_AVATAR_DIR", "avatar/"),
			AssetDir:        getEnv("OSS_ASSET_DIR", "asset/"),
			TokenExpireTime: getEnvInt("OSS_TOKEN_EXPIRE_TIME", 3600),
		},
		Segment: SegmentConfig{
			Provider:     getEnv("SEGMENT_PROVIDER", "imageseg"),
			InferenceURL: getEnv("SEGMENT_INFERENCE_URL", ""),
		},
		Dify: DifyConfig{
			APIBase: getEnv("DIFY_API_BASE", ""),
			APIKey:  getEnv("DIFY_API_KEY", ""),
		},
		Minimax: MinimaxConfig{
			APIKey: getEnv("MINIMAX_API_KEY", ""),
			APIURL: getEnv("MINIMAX_API_URL", "https://api.minimaxi.com/v1/image_generation"),
		},
		LaserCompositor: LaserCompositorConfig{
			URL: getEnv("LASER_COMPOSITOR_URL", "http://127.0.0.1:7000"),
		},
		Redis: RedisConfig{
			Host:     getEnv("REDIS_HOST", "127.0.0.1"),
			Port:     getEnvInt("REDIS_PORT", 6379),
			Password: getEnv("REDIS_PASSWORD", ""),
			DB:       getEnvInt("REDIS_DB", 0),
		},
		DB: DBConfig{
			Host:     getEnv("DB_HOST", "localhost"),
			Port:     getEnvInt("DB_PORT", 5432),
			User:     getEnv("DB_USER", "postgres"),
			Password: getEnv("DB_PASSWORD", ""),
			DBName:   getEnv("DB_NAME", "top-fans"),
			SSLMode:  getEnv("DB_SSLMODE", "disable"),
			TimeZone: getEnv("DB_TIMEZONE", "Asia/Shanghai"),
		},
		WebSocket: WebSocketConfig{
			AIChatPath: getEnv("WS_AI_CHAT_PATH", "/ws/ai-chat"),
		},
	}
}

// getEnv 获取环境变量，如果不存在则返回默认值
func getEnv(key, defaultValue string) string {
	value := os.Getenv(key)
	if value == "" {
		return defaultValue
	}
	return value
}

// getEnvInt 获取整型环境变量，如果不存在或解析失败则返回默认值
func getEnvInt(key string, defaultValue int) int {
	value := os.Getenv(key)
	if value == "" {
		return defaultValue
	}
	intValue, err := strconv.Atoi(value)
	if err != nil {
		return defaultValue
	}
	return intValue
}

// Validate 验证配置
func (c *Config) Validate() error {
	if c.Server.Port == "" {
		return fmt.Errorf("server port is required")
	}
	if c.Dubbo.UserServiceURL == "" {
		return fmt.Errorf("dubbo user service URL is required")
	}
	if c.Dubbo.SocialServiceURL == "" {
		return fmt.Errorf("dubbo social service URL is required")
	}
	if c.Dubbo.AssetServiceURL == "" {
		return fmt.Errorf("dubbo asset service URL is required")
	}
	if c.Dubbo.GalleryServiceURL == "" {
		return fmt.Errorf("dubbo gallery service URL is required")
	}
	if c.Dubbo.ActivityServiceURL == "" {
		return fmt.Errorf("dubbo activity service URL is required")
	}
	if c.Dubbo.TaskServiceURL == "" {
		return fmt.Errorf("dubbo task service URL is required")
	}
	if c.JWT.Secret == "" {
		return fmt.Errorf("JWT secret is required")
	}
	return nil
}