package dialer

import (
	"bff/internal/response"
	"context"
	"fmt"
	"net"

	"pkg.local/discovery"

	"github.com/zeromicro/go-zero/zrpc"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
)

// Nacos builds a zrpc client whose dials resolve via discovery.Pick.
func Nacos(conf zrpc.RpcClientConf) zrpc.Client {
	serviceName := conf.Target
	if serviceName == "" {
		panic("gateway dialer: Grpc.Target (nacos serviceName) is required")
	}

	cliConf := conf
	cliConf.Target = "passthrough:///nacos/" + serviceName
	cliConf.Endpoints = nil

	return zrpc.MustNewClient(cliConf,
		zrpc.WithDialOption(grpc.WithTransportCredentials(insecure.NewCredentials())),
		zrpc.WithDialOption(grpc.WithUnaryInterceptor(response.UserClientInterceptor)),
		zrpc.WithDialOption(grpc.WithContextDialer(func(ctx context.Context, _ string) (net.Conn, error) {
			inst, err := discovery.Pick(serviceName)
			if err != nil {
				return nil, err
			}
			var d net.Dialer
			return d.DialContext(ctx, "tcp", net.JoinHostPort(inst.IP, fmt.Sprintf("%d", inst.Port)))
		})),
	)
}