package webx

import (
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"sync"
	"syscall"
	"time"

	"git.x2erp.com/qdy/go-base/client"
	"git.x2erp.com/qdy/go-base/config/subconfigs"
	"git.x2erp.com/qdy/go-base/logger"
)

// WebService Web服务实例
type WebService struct {
	serviceName string
	httpServer  *http.Server
	router      *http.ServeMux
	//RouterService *router.RouterService // 暴露RouterService
	quit   chan os.Signal
	config *subconfigs.ServiceConfig
	ip     string
	port   int
}

// WebServiceFactory Web服务工厂（全局单例模式）
type WebServiceFactory struct {
	mu         sync.RWMutex
	webService *WebService
}

var (
	instanceWebService     *WebServiceFactory
	instanceWebServiceOnce sync.Once
)

// GetWebServiceFactory 获取Web服务工厂单例
func GetWebServiceFactory() *WebServiceFactory {
	instanceWebServiceOnce.Do(func() {
		log.Printf("Creating WebServiceFactory...")

		instanceWebService = &WebServiceFactory{}

		log.Printf("WebServiceFactory is successfully created.")
	})

	return instanceWebService
}

// CreateService 创建Web服务实例
func (f *WebServiceFactory) CreateService(config *subconfigs.ServiceConfig) (*WebService, error) {
	f.mu.Lock()
	defer f.mu.Unlock()

	// 检查是否已存在服务
	if f.webService != nil {
		log.Printf("服务已存在，返回现有实例: %s", f.webService.serviceName)
		return f.webService, nil
	}

	// 验证配置
	if config == nil {
		return nil, fmt.Errorf("服务配置不能为空")
	}

	// 设置默认值
	if config.Port == 0 {
		config.Port = 8080
	}
	if config.ServiceName == "" {
		config.ServiceName = "default-service"
	}
	if config.ReadTimeout == 0 {
		config.ReadTimeout = 15
	}
	if config.WriteTimeout == 0 {
		config.WriteTimeout = 15
	}
	if config.IdleTimeout == 0 {
		config.IdleTimeout = 60
	}

	// 获取IP
	ip := client.GetServiceIP("")

	// 创建服务实例
	service := &WebService{
		serviceName: config.ServiceName,
		router:      http.NewServeMux(),
		quit:        make(chan os.Signal, 1),
		config:      config,
		ip:          ip,
		port:        config.Port,
	}

	// 创建HTTP服务器
	service.httpServer = &http.Server{
		Addr:         fmt.Sprintf(":%d", config.Port),
		Handler:      service.router,
		ReadTimeout:  time.Duration(config.ReadTimeout) * time.Second,
		WriteTimeout: time.Duration(config.WriteTimeout) * time.Second,
		IdleTimeout:  time.Duration(config.IdleTimeout) * time.Second,
	}

	// 保存实例
	f.webService = service

	log.Printf("已创建服务实例: %s (端口: %d)", config.ServiceName, config.Port)
	return service, nil
}

// IsCreated 检查服务是否已创建
func (f *WebServiceFactory) IsCreated() bool {
	f.mu.RLock()
	defer f.mu.RUnlock()
	return f.webService != nil
}

// ========== WebService 实例方法 ==========

// GetRouter 获取路由器
func (s *WebService) GetRouter() *http.ServeMux {
	return s.router
}

// GetServer 获取HTTP服务器
func (s *WebService) GetServer() *http.Server {
	return s.httpServer
}

// GetServiceName 获取服务名称
func (s *WebService) GetServiceName() string {
	return s.serviceName
}

// GetIP 获取服务IP
func (s *WebService) GetIP() string {
	return s.ip
}

// GetPort 获取服务端口
func (s *WebService) GetPort() int {
	return s.port
}

// GetConfig 获取服务配置
func (s *WebService) GetConfig() *subconfigs.ServiceConfig {
	return s.config
}

// RegisterRoute 注册路由
func (s *WebService) RegisterRoute(pattern string, handler http.Handler) {
	s.router.Handle(pattern, handler)
}

// RegisterRouteFunc 注册路由处理函数
func (s *WebService) RegisterRouteFunc(pattern string, handler func(http.ResponseWriter, *http.Request)) {
	s.router.HandleFunc(pattern, handler)
}

// Run 运行所有服务
func (s *WebService) Run() {
	// 设置全局信号监听
	signal.Notify(s.quit, syscall.SIGINT, syscall.SIGTERM)

	log.Printf("启动服务 %s 在 %s", s.serviceName, s.httpServer.Addr)

	// 在goroutine中启动服务，避免阻塞
	go func() {
		if err := s.httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("服务 %s 运行失败: %v", s.serviceName, err)
		}
	}()

	// 等待中断信号，传递指针
	//s.waitForServiceShutdown(containerFactory)
}

// RunTLS 运行HTTPS服务
func (s *WebService) RunTLS(serviceName, certFile, keyFile string) {

	log.Printf("服务 %s 开始运行(HTTPS)...", s.serviceName)

	// 设置服务级别的信号监听
	signal.Notify(s.quit, syscall.SIGINT, syscall.SIGTERM)

	// 启动HTTPS服务器
	go func() {
		log.Printf("HTTPS服务器启动在 %s", s.httpServer.Addr)
		if err := s.httpServer.ListenAndServeTLS(certFile, keyFile); err != nil && err != http.ErrServerClosed {
			log.Fatalf("服务运行失败: %v", err)
		}
	}()

	// 等待中断信号
	//s.waitForServiceShutdown(containerFactory)
}

// // waitForServiceShutdown 等待单个服务关闭
// func (s *WebService) WaitForServiceShutdown(containerFactory *container.ContainerFactory) {

// 	log.Printf("按 Ctrl+C 停止服务 %s", s.serviceName)

// 	// 等待信号
// 	<-s.quit
// 	log.Printf("接收到终止信号，正在优雅关闭服务 %s...", s.serviceName)

// 	//退出注册中心
// 	//consul.Deregister(s.serviceName, s.Ip, s.Port, b.Cfg.GetConsulConfig())

// 	// 创建关闭上下文，给30秒完成当前请求
// 	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
// 	defer cancel()

// 	// 停止接收新请求，完成当前请求
// 	if err := s.httpServer.Shutdown(ctx); err != nil {
// 		log.Printf("服务 %s 关闭失败: %v", s.serviceName, err)
// 	} else {
// 		log.Printf("服务 %s 已关闭", s.serviceName)
// 	}

// 	// 执行关闭处理
// 	if containerFactory != nil {
// 		containerFactory.CloseAll()
// 	}

// 	// 停止日志写入
// 	logger.StopESWriter()
// 	log.Printf("服务 %s 优雅关闭完成", s.serviceName)

// 	// 等待一小段时间确保日志写入完成
// 	time.Sleep(100 * time.Millisecond)
// 	os.Exit(0)
// }

// AddMiddleware 添加中间件
func (s *WebService) AddMiddleware(middleware func(http.Handler) http.Handler) {
	s.httpServer.Handler = middleware(s.httpServer.Handler)
}

// EnableCORS 启用CORS支持
func (s *WebService) EnableCORS() {
	s.AddMiddleware(func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			w.Header().Set("Access-Control-Allow-Origin", "*")
			w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
			w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")

			if r.Method == "OPTIONS" {
				w.WriteHeader(http.StatusOK)
				return
			}

			next.ServeHTTP(w, r)
		})
	})
}

// EnableRequestLogging 启用请求日志记录
func (s *WebService) EnableRequestLogging() {
	s.AddMiddleware(func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			start := time.Now()

			// 使用包装器记录响应状态码
			rw := &responseWriter{ResponseWriter: w, statusCode: http.StatusOK}

			next.ServeHTTP(rw, r)

			// 记录日志
			duration := time.Since(start)
			log.Printf("%s %s %d %v", r.Method, r.URL.Path, rw.statusCode, duration)
			logger.Info("%s %s %d %v", r.Method, r.URL.Path, rw.statusCode, duration)
		})
	})
}

// 辅助类型，用于记录响应状态码
type responseWriter struct {
	http.ResponseWriter
	statusCode int
}

func (rw *responseWriter) WriteHeader(code int) {
	rw.statusCode = code
	rw.ResponseWriter.WriteHeader(code)
}

// HealthCheck 添加健康检查端点
func (s *WebService) HealthCheck(pattern string) {
	s.RegisterRouteFunc(pattern, func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
		w.Write([]byte("OK"))
	})
}

// Metrics 添加指标端点
func (s *WebService) Metrics(pattern string) {
	s.RegisterRouteFunc(pattern, func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "text/plain")
		w.WriteHeader(http.StatusOK)
		// 这里可以添加应用的指标数据
		w.Write([]byte("# HELP go_info Information about the Go environment.\n"))
		w.Write([]byte("# TYPE go_info gauge\n"))
		w.Write([]byte("go_info{version=\"1.19\"} 1\n"))
	})
}

// StaticFile 添加静态文件服务
func (s *WebService) StaticFile(pattern, filepath string) {
	s.RegisterRouteFunc(pattern, func(w http.ResponseWriter, r *http.Request) {
		http.ServeFile(w, r, filepath)
	})
}

// StaticDirectory 添加静态目录服务
func (s *WebService) StaticDirectory(pattern, directory string) {
	s.RegisterRoute(pattern, http.StripPrefix(pattern, http.FileServer(http.Dir(directory))))
}