package sig

import (
	"context"
	"encoding/json"
	"io"
	"net/http"
	"runtime/debug"
	"sig-pub/pkg/grpc/generic"
	"sig-pub/pkg/grpc/session"
	"sig-pub/pkg/resp"
	"sig-pub/pkg/utils/strs"
	"sig-pub/pkg/zlog"
	"time"

	"github.com/gin-gonic/gin"
	"google.golang.org/protobuf/encoding/protojson"
)

type SigServer struct {
	engine                   *gin.Engine
	grpcGenericClientFactory *generic.GrpcGenericClientFactory
}

func NewSigServer(grpcGenericClientFactory *generic.GrpcGenericClientFactory) *SigServer {
	return &SigServer{
		grpcGenericClientFactory: grpcGenericClientFactory,
	}
}

func (s *SigServer) Init() (err error) {
	s.initGinServer()
	return
}

func (s *SigServer) initGinServer() {
	s.engine = gin.Default()
	s.engine.Use(func(c *gin.Context) {
		// global recover
		defer func() {
			if r := recover(); r != nil {
				zlog.Error("http server recover error:", r)
				debug.PrintStack()
				c.JSON(http.StatusInternalServerError, resp.Error("server error"))
				c.Abort()
			}
		}()
		c.Next()
	})

	routerGroup := s.engine.Group("/api")
	routerGroup.POST("/v1/:svr/:method", s.handleGrpcGenericCall)
	// inst api
	// tradeInstanceApi := inst.NewTradeInstanceApi()
	// tradeInstanceApi.InitRoute(routerGroup)
}

func (s *SigServer) Run(addr string) (err error) {
	// todo grpc server run
	return s.engine.Run(addr)
}

func (s *SigServer) handleGrpcGenericCall(c *gin.Context) {
	svc := strs.UpperInitialLetter(c.Param("svr"))
	method := strs.UpperInitialLetter(c.Param("method"))

	if svc == "" || method == "" {
		c.JSON(http.StatusBadRequest, resp.Error("service not found"))
		return
	}

	// todo service white list

	// get request body
	jsonBody, err := io.ReadAll(c.Request.Body)
	if err != nil {
		c.JSON(http.StatusBadRequest, resp.Error("parse request body error: "+err.Error()))
		return
	}

	ctx1, cancel := context.WithTimeout(context.Background(), time.Second*5)
	defer cancel()
	grpcGenericClient, err := s.grpcGenericClientFactory.GetClient(ctx1, svc)
	if err != nil {
		zlog.Error(err)
		c.JSON(http.StatusForbidden, resp.Error(err.Error()))
		return
	}

	// put session
	ctx := context.Background()
	ctx = session.PutSubject(ctx, session.NewRpcSubject("123456"))
	ctx, cancel = context.WithTimeout(ctx, time.Second*10)
	defer cancel()

	// generic call with json
	rsp, err := grpcGenericClient.InvokeUnaryJsonBytes(ctx, method, jsonBody)
	if err != nil {
		if err == generic.ErrorMethodNotExists {
			c.JSON(http.StatusNotFound, resp.Error(err.Error()))
			return
		}
		c.JSON(http.StatusInternalServerError, resp.Error(err.Error()))
		return
	}

	// decode response
	bytes, err := protojson.Marshal(rsp)
	if err != nil {
		c.JSON(http.StatusInternalServerError, resp.Error(err.Error()))
		return
	}

	r := json.RawMessage(bytes)
	c.JSON(http.StatusOK, resp.Success(r))
}