package di

import (
	"net/http"
	"time"

	"cloudnest/internal/application/auth"
	"cloudnest/internal/application/captcha"
	"cloudnest/internal/application/email"
	"cloudnest/internal/application/file"
	"cloudnest/internal/config"
	"cloudnest/internal/domain/auth/repository"
	fileRepo "cloudnest/internal/domain/file/repository"
	"cloudnest/internal/infrastructure/database"
	infrastructureRepo "cloudnest/internal/infrastructure/repository"
	"cloudnest/internal/infrastructure/storage"
	"cloudnest/internal/interface/http/handler"
	"cloudnest/internal/interface/http/routes"
	"cloudnest/internal/middleware"
	"cloudnest/internal/pkg/logger"
	"github.com/gin-gonic/gin"
	"go.uber.org/dig"
)

type Container struct {
	*dig.Container
}

func New() *Container {
	c := dig.New()

	c.Provide(func() *config.Config {
		return config.Load()
	})

	c.Provide(func(cfg *config.Config) (*database.MySQLClient, error) {
		return database.NewMySQLClient(cfg.Database.DSN())
	})

	c.Provide(func(cfg *config.Config) (*database.RedisClient, error) {
		return database.NewRedisClient(cfg.Cache.Addr(), cfg.Cache.Password, cfg.Cache.DB)
	})

	c.Provide(func(cfg *config.Config) (*storage.MinioClient, error) {
		return storage.NewMinioClient(
			cfg.Storage.Endpoint,
			cfg.Storage.AccessKeyID,
			cfg.Storage.SecretAccessKey,
			cfg.Storage.UseSSL,
		)
	})

	c.Provide(func(mysql *database.MySQLClient) repository.UserRepository {
		return infrastructureRepo.NewUserRepository(mysql)
	})

	c.Provide(func(minio *storage.MinioClient) fileRepo.FileRepository {
		return infrastructureRepo.NewFileRepository(minio)
	})

	c.Provide(func(mysql *database.MySQLClient) *infrastructureRepo.FileMetaRepository {
		return infrastructureRepo.NewFileMetaRepository(mysql)
	})

	c.Provide(func(userRepo repository.UserRepository, emailService *email.EmailService, cfg *config.Config) *auth.AuthService {
		return auth.NewAuthService(userRepo, emailService, cfg.JWT.Secret, cfg.JWT.ExpiresIn)
	})

	c.Provide(func(fRepo fileRepo.FileRepository, fMetaRepo *infrastructureRepo.FileMetaRepository, cfg *config.Config) *file.FileService {
		return file.NewFileService(fRepo, fMetaRepo, cfg.Storage.BucketName)
	})

	c.Provide(func(redis *database.RedisClient) *captcha.CaptchaService {
		return captcha.NewCaptchaService(redis)
	})

	c.Provide(func(cfg *config.Config, redis *database.RedisClient) *email.EmailService {
		return email.NewEmailService(&cfg.Email, redis)
	})

	c.Provide(func(service *auth.AuthService, captchaService *captcha.CaptchaService, emailService *email.EmailService) *handler.AuthHandler {
		return handler.NewAuthHandler(service, captchaService, emailService)
	})

	c.Provide(func(emailService *email.EmailService, captchaService *captcha.CaptchaService) *handler.EmailHandler {
		return handler.NewEmailHandler(emailService, captchaService)
	})

	c.Provide(func(service *file.FileService, authService *auth.AuthService) *handler.FileHandler {
		return handler.NewFileHandler(service, authService)
	})

	c.Provide(func(service *captcha.CaptchaService) *handler.CaptchaHandler {
		return handler.NewCaptchaHandler(service)
	})

	return &Container{c}
}

// BuildEngine builds the Gin engine with routes based on service type.
// BuildEngine 根据服务类型构建 Gin 引擎并注册路由。
//
// Parameters:
//   - serviceType: The type of service (auth or file).
//
// Returns:
//   - *gin.Engine: The configured Gin engine.
//   - error: Any error that occurred during setup.
//
// 参数:
//   - serviceType: 服务类型 (auth 或 file)。
//
// 返回值:
//   - *gin.Engine: 配置好的 Gin 引擎。
//   - error: 设置过程中发生的任何错误。
func (c *Container) BuildEngine(serviceType routes.ServiceType) (*gin.Engine, error) {
	var engine *gin.Engine
	err := c.Invoke(func(cfg *config.Config, authHandler *handler.AuthHandler, fileHandler *handler.FileHandler, captchaHandler *handler.CaptchaHandler, emailHandler *handler.EmailHandler) {
		engine = gin.New()

		engine.RedirectTrailingSlash = false
		engine.RedirectFixedPath = false

		engine.Use(gin.Recovery())
		engine.Use(middleware.CORS())
		engine.Use(middleware.ErrorHandler())

		engine.GET("/healthz", func(ctx *gin.Context) {
			ctx.JSON(http.StatusOK, gin.H{"status": "ok"})
		})

		routes.SetupRoutes(engine, serviceType, authHandler, fileHandler, captchaHandler, emailHandler, cfg.JWT.Secret)

		logger.Info("engine built successfully")
	})

	return engine, err
}

// BuildAuthEngine builds the Gin engine for auth service.
// BuildAuthEngine 为认证服务构建 Gin 引擎。
//
// This method only registers authentication routes.
//
// 此方法只注册认证路由。
func (c *Container) BuildAuthEngine() (*gin.Engine, error) {
	return c.BuildEngine(routes.ServiceTypeAuth)
}

// BuildFileEngine builds the Gin engine for file service.
// BuildFileEngine 为文件服务构建 Gin 引擎。
//
// This method only registers file management routes.
//
// 此方法只注册文件管理路由。
func (c *Container) BuildFileEngine() (*gin.Engine, error) {
	return c.BuildEngine(routes.ServiceTypeFile)
}

func (c *Container) InitializeServices() error {
	return c.Invoke(func(mysql *database.MySQLClient, redis *database.RedisClient, minio *storage.MinioClient, cfg *config.Config) error {
		if err := mysql.Migrate(); err != nil {
			return err
		}

		if err := minio.EnsureBucket(cfg.Storage.BucketName); err != nil {
			return err
		}

		logger.Info("all services initialized")
		
		go startRecycleBinCleaner(cfg, mysql, minio)
		
		return nil
	})
}

func startRecycleBinCleaner(cfg *config.Config, mysql *database.MySQLClient, minio *storage.MinioClient) {
	expireDays := cfg.Storage.RecycleBinExpireDays
	if expireDays <= 0 {
		expireDays = 7
	}
	
	fMetaRepo := infrastructureRepo.NewFileMetaRepository(mysql)
	fRepo := infrastructureRepo.NewFileRepository(minio)
	
	ticker := time.NewTicker(24 * time.Hour)
	defer ticker.Stop()
	
	for {
		logger.Info("starting recycle bin cleanup", "expire_days", expireDays)
		
		expiredFiles, err := fMetaRepo.CleanExpiredRecycleBin(expireDays)
		if err != nil {
			logger.Error("failed to clean recycle bin", "error", err)
			continue
		}
		
		for _, df := range expiredFiles {
			if err := fRepo.Delete(df.UserCode, df.FileKey); err != nil {
				logger.Error("failed to delete file from storage", "file_key", df.FileKey, "error", err)
			}
		}
		
		logger.Info("recycle bin cleanup completed", "files_cleaned", len(expiredFiles))
		
		<-ticker.C
	}
}