package main

import (
	"context"
	"fmt"
	"github.com/afex/hystrix-go/hystrix"
	consul "github.com/asim/go-micro/plugins/registry/consul/v4"
	"github.com/go-micro/plugins/v4/wrapper/select/roundrobin"
	opentracing2 "github.com/go-micro/plugins/v4/wrapper/trace/opentracing"
	"github.com/opentracing/opentracing-go"
	"go-micro.dev/v4/client"
	"go-micro.dev/v4/web"
	"goproduct/common"
	"goproduct/proto"
	"log"
	"net"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"go-micro.dev/v4"
	"go-micro.dev/v4/registry"
)

// 获取远程服务的客户端
func main() {
	router := gin.Default()

	//注册到consul
	consulReg := consul.NewRegistry(func(options *registry.Options) {
		options.Addrs = []string{"192.168.100.131:8500"}
	})
	//初始化链路追踪的jaeper
	t, io, err := common.NewTracer("shop-cart-client", "192.168.100.131:6831")
	if err != nil {
		log.Println(err)
	}
	defer io.Close()
	opentracing.SetGlobalTracer(t)

	//熔断器
	hystrixStreamHandler := hystrix.NewStreamHandler()
	hystrixStreamHandler.Start()
	go func() {
		err := http.ListenAndServe(net.JoinHostPort("192.168.100.1", "9096"), hystrixStreamHandler)
		if err != nil {
			log.Panic(err)
		}
	}()

	rpcServer := micro.NewService(
		//micro.Name("shop-product-client"),
		micro.Registry(consulReg), //服务发现
		micro.WrapClient(opentracing2.NewClientWrapper(opentracing.GlobalTracer())),
		//加入熔断器
		micro.WrapClient(NewClientHystrixWrapper()),
		//负载均衡
		micro.WrapClient(roundrobin.NewClientWrapper()),
	)
	client := proto.NewAddCartService("shop-cart", rpcServer.Client())
	clientA := proto.NewShowProductDetailService("shop-product", rpcServer.Client())
	clientB := proto.NewShowDetailSkuService("shop-product", rpcServer.Client())
	//分页查询商品列表
	router.GET("/increase", func(c *gin.Context) {
		// "number": 0,
		//  "productId": 0,
		//  "productSkuId": 0
		number, _ := strconv.Atoi(c.Request.FormValue("number"))
		productId, _ := strconv.Atoi(c.Request.FormValue("productId"))
		productSkuId, _ := strconv.Atoi(c.Request.FormValue("productSkuId"))

		//拼接请求信息
		req := &proto.AddCartReq{
			Number:       int32(number),
			ProductId:    int32(productId),
			ProductSkuId: int32(productSkuId),
		}
		//商品详情
		reqDetail := &proto.ProductDetailReq{
			Id: int32(productId),
		}
		respDetail, err := clientA.ShowProductDetail(context.TODO(), reqDetail)
		if respDetail != nil {
			req.ProductName = respDetail.ProductDetail[0].Name
			req.ProductMainPicture = respDetail.ProductDetail[0].MainPicture
		}

		log.Println(" /ShowProductDetail   resp   :", respDetail)
		//SKU详情
		reqDetail.Id = req.ProductSkuId
		respSkuDetail, err := clientB.ShowDetailSku(context.TODO(), reqDetail)

		log.Println(" /ShowDetailSku   resp   :", respSkuDetail)

		//添加购物车  远程调用服务
		log.Println(" /AddCart  req :", req)

		if respSkuDetail.ProductSku[0].Stock < req.Number {
			common.RespFail(c.Writer, &proto.AddCartResp{}, "库存不足，添加失败")
			return
		}

		resp, err := client.AddCart(context.TODO(), req)
		resp.ProductSkuSimple = respSkuDetail.ProductSku[0]
		resp.ProductSimple = respDetail.ProductDetail[0]

		log.Println(" /AddCart  resp :", resp)

		//根据响应做输出
		if err != nil {
			log.Println(err.Error())
			common.RespFail(c.Writer, resp, "请求失败")
			return
		}
		////writer  data  message  row  total  field
		common.RespOK(c.Writer, resp, "请求成功")
	})

	service := web.NewService(
		web.Address(":6668"),
		web.Name("shop-cart-client"),
		web.Registry(consulReg),
		web.Handler(router),
	)
	//启动服务
	service.Run()
}

type clientWrapper struct {
	client.Client
}

func (c clientWrapper) Call(ctx context.Context, req client.Request, resp interface{}, opts ...client.CallOption) error {
	return hystrix.Do(req.Service()+"."+req.Endpoint(), func() error {
		//正常执行
		fmt.Println("call success ", req.Service()+"."+req.Endpoint())
		return c.Client.Call(ctx, req, resp, opts...)
	}, func(err error) error {
		fmt.Println("call err :", err)
		return err
	})

}

func NewClientHystrixWrapper() client.Wrapper {
	return func(i client.Client) client.Client {
		return &clientWrapper{i}
	}

}