package main

import (
	"context"
	"fmt"
	netHttp "net/http"
	"net/http/httputil"
	"net/url"
	"strings"

	"gitee.com/red-future---jilin-g/common/consul"
	"gitee.com/red-future---jilin-g/common/http"
	"gitee.com/red-future---jilin-g/common/middleware"
	_ "gitee.com/red-future---jilin-g/common/swagger"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/net/ghttp"
)

func StartServerProxy() {
	// 初始化Sentinel熔断器
	err := middleware.InitCircuitBreaker()
	if err != nil {
		g.Log().Errorf(context.Background(), "熔断器初始化失败: %v", err)
		panic("熔断器初始化失败")
	}

	// 绑定中间件：CORS -> IP限流 -> 用户限流 -> 熔断降级 -> 服务限流 -> 全局限流
	http.Httpserver.BindMiddlewareDefault(
		ghttp.MiddlewareCORS,
		middleware.IPLimiter,                // IP限流(防DDoS)
		middleware.UserLimiter,              // 用户限流(防止单用户滥用)
		middleware.CircuitBreakerMiddleware, // ⭐ 熔断降级(保护后端服务)
		middleware.ServiceLimiter,           // 服务限流(保护微服务)
		middleware.GlobalLimiter,            // Redis全局限流(分布式支持)
	) //使用默认http返回结构

	// 熔断器健康检查接口
	http.Httpserver.BindHandler("/circuit-breaker/health", middleware.CircuitBreakerHealthCheckHandler)

	// 熔断器手动重置接口（仅限管理后台调用）
	http.Httpserver.BindHandler("/circuit-breaker/reset", middleware.CircuitBreakerResetHandler)

	// 熔断器配置重载接口
	http.Httpserver.BindHandler("/circuit-breaker/reload", middleware.CircuitBreakerReloadHandler)

	http.Httpserver.BindHandler("/*", func(r *ghttp.Request) {
		g.Log().Debugf(r.GetCtx(), "url:%s", r.RequestURI)
		serverName := strings.Split(r.RequestURI, "/")[1]
		instanceAddr, err := consul.GetInstanceAddr(r.GetCtx(), serverName)
		if err != nil {
			g.Log().Errorf(r.GetCtx(), "serverName:%s不可用", serverName)
			r.Response.Status = 503
			r.Response.WriteJsonExit(map[string]interface{}{
				"success": false,
				"code":    503,
				"message": fmt.Sprintf("服务 '%s' 暂时不可用", serverName),
			})
			return
		}
		r.Request.URL.Path = strings.Replace(r.Request.URL.Path, fmt.Sprintf("%s/", serverName), "", 1)
		r.MakeBodyRepeatableRead(false)
		u, _ := url.Parse(fmt.Sprintf("%s://%s", "http", instanceAddr))
		proxy := httputil.NewSingleHostReverseProxy(u)
		proxy.ErrorHandler = func(writer netHttp.ResponseWriter, request *netHttp.Request, e error) {
			writer.WriteHeader(netHttp.StatusBadGateway)
		}
		proxy.ServeHTTP(r.Response.Writer, r.Request)
	})
}
func main() {
	StartServerProxy()
	http.Httpserver.Run()
	// select {}
}