package main

import (
	"context"
	"errors"
	"flag"

	"zero/core/conf"
	"zero/example/tracing/remote/portal"
	"zero/example/tracing/remote/user"
	"zero/rpcx"

	"google.golang.org/grpc"
)

var configFile = flag.String("f", "etc/config.json", "the config file")

type (
	Config struct {
		rpcx.RpcServerConf
		UserRpc rpcx.RpcClientConf
	}

	PortalServer struct {
		userRpc *rpcx.RpcClient
	}
)

func NewPortalServer(client *rpcx.RpcClient) *PortalServer {
	return &PortalServer{
		userRpc: client,
	}
}

func (gs *PortalServer) Portal(ctx context.Context, req *portal.PortalRequest) (*portal.PortalResponse, error) {
	conn, ok := gs.userRpc.Next()
	if !ok {
		return nil, errors.New("internal error")
	}

	greet := user.NewUserClient(conn)
	resp, err := greet.GetGrade(ctx, &user.UserRequest{
		Name: req.Name,
	})
	if err != nil {
		return &portal.PortalResponse{
			Response: err.Error(),
		}, nil
	} else {
		return &portal.PortalResponse{
			Response: resp.Response,
		}, nil
	}
}

func main() {
	flag.Parse()

	var c Config
	conf.MustLoad(*configFile, &c)

	client := rpcx.MustNewClient(c.UserRpc)
	server := rpcx.MustNewServer(c.RpcServerConf, func(grpcServer *grpc.Server) {
		portal.RegisterPortalServer(grpcServer, NewPortalServer(client))
	})
	server.Start()
}