package cRpc

import (
	"errors"
	"fmt"
	"reflect"

	"github.com/gin-gonic/gin"
	"google.golang.org/grpc"

	"gitee.com/csingo/cContext"
	"gitee.com/csingo/cLog"
)

func GRPCRequest[C any](ctx *gin.Context, client RpcClientInterface, f func(cc grpc.ClientConnInterface) C, method string, req interface{}) (rsp interface{}, err error) {
	var conn grpc.ClientConnInterface
	pkg, app, service := client.RpcClientName()
	conn, err = clientContainer.GetGrpcConn(pkg, app, service)
	if err != nil {
		return
	}

	svc := f(conn)
	newCtx := cContext.GinToGrpc(ctx)
	svcMethod := reflect.ValueOf(svc).MethodByName(method)
	if !svcMethod.IsValid() || svcMethod.IsNil() {
		err = fmt.Errorf("grpc client method not found: %s.%s.%s.%s", pkg, app, service, method)
		cLog.WithContext(ctx, map[string]interface{}{
			"source": "cRpc.GRPCRequest:reflect.MethodByName",
		}).Error("grpc client 方法调用异常")
		return
	}

	params := []reflect.Value{
		reflect.ValueOf(newCtx),
		reflect.ValueOf(req),
	}

	result := svcMethod.Call(params)
	if len(result) != 2 {
		err = fmt.Errorf("grpc server return invalid result")
		cLog.WithContext(ctx, map[string]interface{}{
			"source": "cRpc.GRPCRequest:.reflect.Call",
			"req":    req,
		}).Error("grpc server 返回结果异常")
		return
	}

	rsp = result[0].Interface()
	errors.As(err, result[1].Interface())

	return
}