package service

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

	"nms_cxy/src/framework/logger"
	"nms_cxy/src/framework/utils/ssh"
	"nms_cxy/src/framework/utils/telnet"
	"nms_cxy/src/framework/vo/result"
	"nms_cxy/src/modules/ws/model"
	"nms_cxy/src/modules/ws/processor"
)

// 实例化服务层 WSReceiveImpl 结构体
var NewWSReceiveImpl = &WSReceiveImpl{}

// WSReceiveImpl WebSocket消息接收处理 服务层处理
type WSReceiveImpl struct{}

// Commont 接收通用业务处理
func (s *WSReceiveImpl) close(client *model.WSClient) {
	// 主动关闭
	resultByte, _ := json.Marshal(result.OkMsg("user initiated closure"))
	client.MsgChan <- resultByte
	// 等待1s后关闭连接
	time.Sleep(1 * time.Second)
	NewWSImpl.ClientClose(client.ID)
}

// Commont 接收通用业务处理
func (s *WSReceiveImpl) Commont(client *model.WSClient, reqMsg model.WSRequest) {
	// 必传requestId确认消息
	if reqMsg.RequestID == "" {
		msg := "message requestId is required"
		logger.Infof("ws Commont UID %s err: %s", client.BindUid, msg)
		msgByte, _ := json.Marshal(result.ErrMsg(msg))
		client.MsgChan <- msgByte
		return
	}

	var resByte []byte
	var err error

	switch reqMsg.Type {
	case "close":
		s.close(client)
		return
	case "ps":
		resByte, err = processor.GetProcessData(reqMsg.RequestID, reqMsg.Data)
	case "net":
		resByte, err = processor.GetNetConnections(reqMsg.RequestID, reqMsg.Data)
	case "ims_cdr":
		resByte, err = processor.GetCDRConnectByIMS(reqMsg.RequestID, reqMsg.Data)
	case "smf_cdr":
		resByte, err = processor.GetCDRConnectBySMF(reqMsg.RequestID, reqMsg.Data)
	case "smsc_cdr":
		resByte, err = processor.GetCDRConnectBySMSC(reqMsg.RequestID, reqMsg.Data)
	case "amf_ue":
		resByte, err = processor.GetUEConnectByAMF(reqMsg.RequestID, reqMsg.Data)
	case "mme_ue":
		resByte, err = processor.GetUEConnectByMME(reqMsg.RequestID, reqMsg.Data)
	case "upf_tf":
		resByte, err = processor.GetUPFTotalFlow(reqMsg.RequestID, reqMsg.Data)
	case "ne_state":
		resByte, err = processor.GetNeState(reqMsg.RequestID, reqMsg.Data)
	default:
		err = fmt.Errorf("message type %s not supported", reqMsg.Type)
	}

	if err != nil {
		logger.Warnf("ws Commont UID %s err: %s", client.BindUid, err.Error())
		msgByte, _ := json.Marshal(result.ErrMsg(err.Error()))
		client.MsgChan <- msgByte
		return
	}
	if len(resByte) > 0 {
		client.MsgChan <- resByte
	}
}

// Shell 接收终端交互业务处理
func (s *WSReceiveImpl) Shell(client *model.WSClient, reqMsg model.WSRequest) {
	// 必传requestId确认消息
	if reqMsg.RequestID == "" {
		msg := "message requestId is required"
		logger.Infof("ws Shell UID %s err: %s", client.BindUid, msg)
		msgByte, _ := json.Marshal(result.ErrMsg(msg))
		client.MsgChan <- msgByte
		return
	}

	var resByte []byte
	var err error

	switch reqMsg.Type {
	case "close":
		s.close(client)
		return
	case "ssh":
		// SSH会话消息接收写入会话
		command := reqMsg.Data.(string)
		sshClientSession := client.ChildConn.(*ssh.SSHClientSession)
		_, err = sshClientSession.Write(command)
	case "ssh_resize":
		// SSH会话窗口重置
		msgByte, _ := json.Marshal(reqMsg.Data)
		var data struct {
			Cols int `json:"cols"`
			Rows int `json:"rows"`
		}
		err = json.Unmarshal(msgByte, &data)
		if err == nil {
			sshClientSession := client.ChildConn.(*ssh.SSHClientSession)
			err = sshClientSession.Session.WindowChange(data.Rows, data.Cols)
		}
	default:
		err = fmt.Errorf("message type %s not supported", reqMsg.Type)
	}

	if err != nil {
		logger.Warnf("ws Shell UID %s err: %s", client.BindUid, err.Error())
		msgByte, _ := json.Marshal(result.ErrMsg(err.Error()))
		client.MsgChan <- msgByte
		if err == io.EOF {
			// 等待1s后关闭连接
			time.Sleep(1 * time.Second)
			client.StopChan <- struct{}{}
		}
		return
	}
	if len(resByte) > 0 {
		client.MsgChan <- resByte
	}
}

// ShellView 接收查看文件终端交互业务处理
func (s *WSReceiveImpl) ShellView(client *model.WSClient, reqMsg model.WSRequest) {
	// 必传requestId确认消息
	if reqMsg.RequestID == "" {
		msg := "message requestId is required"
		logger.Infof("ws ShellView UID %s err: %s", client.BindUid, msg)
		msgByte, _ := json.Marshal(result.ErrMsg(msg))
		client.MsgChan <- msgByte
		return
	}

	var resByte []byte
	var err error

	switch reqMsg.Type {
	case "close":
		s.close(client)
		return
	case "cat", "tail":
		var command string
		if reqMsg.Type == "cat" {
			command, err = processor.ParseCat(reqMsg.Data)
		}
		if reqMsg.Type == "tail" {
			command, err = processor.ParseTail(reqMsg.Data)
		}
		if command != "" && err == nil {
			sshClientSession := client.ChildConn.(*ssh.SSHClientSession)
			_, err = sshClientSession.Write(command)
		}
	case "ctrl-c":
		// 模拟按下 Ctrl+C
		sshClientSession := client.ChildConn.(*ssh.SSHClientSession)
		_, err = sshClientSession.Write("\u0003\n")
	case "resize":
		// 会话窗口重置
		msgByte, _ := json.Marshal(reqMsg.Data)
		var data struct {
			Cols int `json:"cols"`
			Rows int `json:"rows"`
		}
		err = json.Unmarshal(msgByte, &data)
		if err == nil {
			sshClientSession := client.ChildConn.(*ssh.SSHClientSession)
			err = sshClientSession.Session.WindowChange(data.Rows, data.Cols)
		}
	default:
		err = fmt.Errorf("message type %s not supported", reqMsg.Type)
	}

	if err != nil {
		logger.Warnf("ws ShellView UID %s err: %s", client.BindUid, err.Error())
		msgByte, _ := json.Marshal(result.ErrMsg(err.Error()))
		client.MsgChan <- msgByte
		if err == io.EOF {
			// 等待1s后关闭连接
			time.Sleep(1 * time.Second)
			client.StopChan <- struct{}{}
		}
		return
	}
	if len(resByte) > 0 {
		client.MsgChan <- resByte
	}
}

// Telnet 接收终端交互业务处理
func (s *WSReceiveImpl) Telnet(client *model.WSClient, reqMsg model.WSRequest) {
	// 必传requestId确认消息
	if reqMsg.RequestID == "" {
		msg := "message requestId is required"
		logger.Infof("ws Shell UID %s err: %s", client.BindUid, msg)
		msgByte, _ := json.Marshal(result.ErrMsg(msg))
		client.MsgChan <- msgByte
		return
	}

	var resByte []byte
	var err error

	switch reqMsg.Type {
	case "close":
		s.close(client)
		return
	case "telnet":
		// Telnet会话消息接收写入会话
		command := reqMsg.Data.(string)
		telnetClientSession := client.ChildConn.(*telnet.TelnetClientSession)
		_, err = telnetClientSession.Write(command)
	case "telnet_resize":
		// Telnet会话窗口重置
		msgByte, _ := json.Marshal(reqMsg.Data)
		var data struct {
			Cols int `json:"cols"`
			Rows int `json:"rows"`
		}
		err = json.Unmarshal(msgByte, &data)
		if err == nil {
			telnetClientSession := client.ChildConn.(*telnet.TelnetClientSession)
			err = telnetClientSession.WindowChange(data.Rows, data.Cols)
			_ = telnetClientSession.Read()
		}
	default:
		err = fmt.Errorf("message type %s not supported", reqMsg.Type)
	}

	if err != nil {
		logger.Warnf("ws Shell UID %s err: %s", client.BindUid, err.Error())
		msgByte, _ := json.Marshal(result.ErrMsg(err.Error()))
		client.MsgChan <- msgByte
		if err == io.EOF {
			// 等待1s后关闭连接
			time.Sleep(1 * time.Second)
			client.StopChan <- struct{}{}
		}
		return
	}
	if len(resByte) > 0 {
		client.MsgChan <- resByte
	}
}