package server

import (
	"context"
	"fmt"
	"github.com/gorilla/websocket"
	"runtime/debug"
	"sonet/internal/gateway_ws/session"
	"sonet/pkg/grpc/generic"
	"sonet/pkg/protocol"
	"sonet/pkg/utils/logger"
)

type ConnHandler struct {
	grpcFactory *generic.GrpcGenericClientFactory
}

func NewConnHandler(grpcFactory *generic.GrpcGenericClientFactory) *ConnHandler {
	return &ConnHandler{
		grpcFactory: grpcFactory,
	}
}

func (c *ConnHandler) handleConn(conn *websocket.Conn) {
	client := session.NewNetClient(conn, ReadDeadline, WriteDeadline)

	defer func() {
		// 捕获其他错误
		if r := recover(); r != nil {
			logger.Error("NetClient recover error: ", r)
			// 输出堆栈信息
			logger.Error("NetClient recover error stack: ", string(debug.Stack()))
		}
	}()

	defer client.Close()

	for {
		message, err := client.ReadMessage()
		if err != nil {
			// TODO 连接关闭，mq发送关闭事件
			if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway) {
				logger.Error("unexpected close error: ", err)
			} else {
				// 读失败
				logger.Errorf("NetClient ReadMessage error: %T, %v", err, err)
			}
			return
		}

		payload, err := protocol.Decode(message)
		if err != nil {
			logger.Errorf("decode message error: len=%d", len(message), err)
			return
		}
		fmt.Printf("%v\n", payload)

		// grpc generic call
		ctx := context.Background()
		grpcClient, err := c.grpcFactory.GetClient(ctx, payload.Header.Svc)
		if err != nil {
			logger.Error("get grpc generic client error: ", err)
			continue
		}
		resp, err := grpcClient.InvokeUnary(ctx, payload.Header.Target, payload.Body)
		if err != nil {
			logger.Error("grpc generic call error: ", err)
			continue
		}
		fmt.Println(resp)

		// write response
		payload.Header.Type = protocol.TypeResponse
		payload.Header.Svc = ""
		payload.Header.Target = ""
		payload.Body, err = resp.Marshal()
		if err != nil {
			logger.Error("generic call response marshal error: ", err)
			continue
		}
		resMessage, err := protocol.Encode(payload)
		if err != nil {
			logger.Error("grpc generic call error: ", err)
			continue
		}
		client.MustWrite(resMessage)
	}

}