/*
 * @Description:
 * @Version: 1.0
 * @Autor: solid
 * @Date: 2022-08-24 18:37:22
 * @LastEditors: solid
 * @LastEditTime: 2022-09-16 14:56:15
 */
package main

import (
	"fmt"
	"net/http"
	"strings"

	"gitee.com/solidone/sutils/swebsocket"
	"github.com/gin-gonic/gin"
	"github.com/gorilla/websocket"
)

var Upgrader *websocket.Upgrader = &websocket.Upgrader{
	ReadBufferSize:  2 * 1024,
	WriteBufferSize: 2 * 1024,
	// Allow connections from any Origin
	CheckOrigin: func(r *http.Request) bool { return true },
}

type Response struct {
	Code int         `json:"code"`
	Msg  string      `json:"message"`
	Data interface{} `json:"data"`
}

func Connect(ctx *gin.Context) {
	wsConn, err := Upgrader.Upgrade(ctx.Writer, ctx.Request, nil)
	if err != nil {
		fmt.Println(err)
		return
	}
	ClientConn, _ := swebsocket.CreateConn(wsConn, 1)

	ClientConn.Handle(func(msg []byte, conn *swebsocket.ServerConn) {
		ClientConn.Send <- msg
	})
	ClientConn.WriteReadLoop()
}

func main() {
	router := gin.Default()
	//跨域
	router.Use(Cors())

	router.GET("/ws", Connect)

	err := router.Run(":8888")
	if err != nil {
		fmt.Println("Init http server. Error :", err)
	}

}

// 跨域
func Cors() gin.HandlerFunc {
	return func(c *gin.Context) {
		method := c.Request.Method               // 请求方法
		origin := c.Request.Header.Get("Origin") // 请求头部

		var headerKeys []string // 声明请求头keys
		for k := range c.Request.Header {
			headerKeys = append(headerKeys, k)
		}
		headerStr := strings.Join(headerKeys, ", ")
		if headerStr == "" {
			headerStr = "access-control-allow-origin, access-control-allow-headers"
		}
		if origin != "" {
			c.Header("Access-Control-Allow-Origin", origin)                                    // 这是允许访问所有域
			c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE,UPDATE") // 服务器支持的所有跨域请求的方法,为了避免浏览次请求的多次'预检'请求
			//  header的类型
			c.Header("Access-Control-Allow-Headers", "*")
			//              允许跨域设置                                                                                                      可以返回其他子段
			c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers,Cache-Control,Content-Language,Content-Type,Expires,Last-Modified,Pragma,FooBar") // 跨域关键设置 让浏览器可以解析
			c.Header("Access-Control-Max-Age", "172800")                                                                                                                                                           // 缓存请求信息 单位为秒
			c.Header("Access-Control-Allow-Credentials", "true")                                                                                                                                                   //  跨域请求是否需要带cookie信息 默认设置为true
			c.Set("content-type", "application/json")                                                                                                                                                              // 设置返回格式是json
		}

		// 放行所有OPTIONS方法
		if method == "OPTIONS" {
			c.JSON(http.StatusOK, "Options Request!")
		}
		// 处理请求
		c.Next() //  处理请求
	}
}