package controller

import (
	"encoding/json"
	"fmt"
	"time"

	"be.ems/src/framework/i18n"
	"be.ems/src/framework/logger"
	"be.ems/src/framework/utils/ctx"
	"be.ems/src/framework/vo/result"
	neService "be.ems/src/modules/network_element/service"

	"github.com/gin-gonic/gin"
)

// ShellView 终端交互式文件内容查看
//
// GET /view
func (s *WSController) ShellView(c *gin.Context) {
	language := ctx.AcceptLanguage(c)
	var query struct {
		NeType string `form:"neType" binding:"required"` // 网元类型
		NeId   string `form:"neId" binding:"required"`   // 网元标识id
		Cols   int    `form:"cols"`                      // 终端单行字符数
		Rows   int    `form:"rows"`                      // 终端显示行数
	}
	if err := c.ShouldBindQuery(&query); err != nil {
		c.JSON(400, result.CodeMsg(400, i18n.TKey(language, "app.common.err400")))
		return
	}
	if query.Cols < 120 || query.Cols > 400 {
		query.Cols = 120
	}
	if query.Rows < 40 || query.Rows > 1200 {
		query.Rows = 40
	}

	// 登录用户信息
	loginUser, err := ctx.LoginUser(c)
	if err != nil {
		c.JSON(401, result.CodeMsg(401, i18n.TKey(language, err.Error())))
		return
	}

	// 网元主机的SSH客户端
	sshClient, err := neService.NewNeInfo.NeRunSSHClient(query.NeType, query.NeId)
	if err != nil {
		c.JSON(200, result.ErrMsg(err.Error()))
		return
	}
	defer sshClient.Close()
	// ssh连接会话
	clientSession, err := sshClient.NewClientSession(query.Cols, query.Rows)
	if err != nil {
		c.JSON(200, result.ErrMsg("neinfo ssh client session new err"))
		return
	}
	defer clientSession.Close()

	// 将 HTTP 连接升级为 WebSocket 连接
	wsConn := s.wsService.UpgraderWs(c.Writer, c.Request)
	if wsConn == nil {
		return
	}
	defer wsConn.Close()

	wsClient := s.wsService.ClientCreate(loginUser.UserID, nil, wsConn, clientSession)
	go s.wsService.ClientWriteListen(wsClient)
	go s.wsService.ClientReadListen(wsClient, s.wsReceiveService.ShellView)

	// 等待1秒，排空首次消息
	time.Sleep(1 * time.Second)
	_ = clientSession.Read()

	// 实时读取SSH消息直接输出
	msTicker := time.NewTicker(100 * time.Millisecond)
	defer msTicker.Stop()
	for {
		select {
		case ms := <-msTicker.C:
			outputByte := clientSession.Read()
			if len(outputByte) > 0 {
				outputStr := string(outputByte)
				msgByte, _ := json.Marshal(result.Ok(map[string]any{
					"requestId": fmt.Sprintf("view_%d", ms.UnixMilli()),
					"data":      outputStr,
				}))
				wsClient.MsgChan <- msgByte
			}
		case <-wsClient.StopChan: // 等待停止信号
			s.wsService.ClientClose(wsClient.ID)
			logger.Infof("ws Stop Client UID %s", wsClient.BindUid)
			return
		}
	}
}