package main

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

	"gitea.com/red-future/common/consul"
	"gitea.com/red-future/common/http"
	"gitea.com/red-future/common/middleware"
	_ "gitea.com/red-future/common/swagger"
	"gitea.com/red-future/common/utils"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/net/ghttp"
	"github.com/gogf/gf/v2/util/gconv"
)

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跨域 -> 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
		}

		// 1. 解析 consul 配置地址
		consulAddr := g.Cfg().MustGet(r.GetCtx(), "consul.address").String()
		consulAddrList := strings.Split(consulAddr, ":")
		if len(consulAddrList) < 1 {
			g.Log().Error(r.GetCtx(), "consul.address 配置格式错误")
			r.Response.WriteJsonExit(map[string]interface{}{
				"success": false,
				"code":    500,
				"message": fmt.Sprintf("consul.address 配置格式错误：%s", consulAddr),
			})
			return
		}
		ipStr := instanceAddr
		if strings.Contains(instanceAddr, ":") {
			ipStr = strings.Split(instanceAddr, ":")[0]
		}
		// 2. 如果不是本地IP，则替换为consul配置的IP
		if !utils.IsLocalIP(ipStr) {
			instanceAddr = strings.Replace(instanceAddr, ipStr, consulAddrList[0], 1)
		}

		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)
		}
		if !strings.Contains(r.RequestURI, "/swagger") && !strings.Contains(r.RequestURI, "/pub/captcha/get") && !strings.Contains(r.RequestURI, "/login") && !strings.Contains(r.RequestURI, "/web/socket/") {
			user, err := utils.GetUserInfo(r.GetCtx())
			if err != nil {
				g.Log().Errorf(r.GetCtx(), "获取用户信息失败: %v", err)
				r.Response.Status = 500
				r.Response.WriteJsonExit(map[string]interface{}{
					"success": false,
					"code":    500,
					"message": "获取用户信息失败",
				})
				return
			}
			// 将用户信息通过 Header 传递给下游服务
			r.Request.Header.Set("X-User-Info", gconv.String(&user))
		}

		proxy.ServeHTTP(r.Response.Writer, r.Request)
	})
}
func main() {
	StartServerProxy()
	http.Httpserver.Run()
	// select {}
}