// Copyright 2019 Yunion
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package command

import (
	"context"
	"fmt"
	"io/ioutil"
	"net"
	"os"
	"os/exec"
	"strings"
	"time"

	"yunion.io/x/jsonutils"
	"yunion.io/x/log"

	"yunion.io/x/onecloud/pkg/mcclient"
	"yunion.io/x/onecloud/pkg/mcclient/auth"
	"yunion.io/x/onecloud/pkg/mcclient/modules"
	"yunion.io/x/onecloud/pkg/util/ansible"
	o "yunion.io/x/onecloud/pkg/webconsole/options"
)

type SSHtoolSol struct {
	*BaseCommand
	IP       string
	Port     int
	Username string
	reTry    int
	showInfo string
	keyFile  string
}

func getCommand(ctx context.Context, userCred mcclient.TokenCredential, ip string, port int) (string, *BaseCommand, error) {
	cmd := NewBaseCommand(o.Options.SshToolPath)
	if !o.Options.EnableAutoLogin {
		return "", nil, nil
	}
	s := auth.GetAdminSession(ctx, o.Options.Region, "v2")
	key, err := modules.Sshkeypairs.GetById(s, userCred.GetProjectId(), jsonutils.Marshal(map[string]bool{"admin": true}))
	if err != nil {
		return "", nil, err
	}
	file, err := ioutil.TempFile("", fmt.Sprintf("id_rsa.%s.", ip))
	if err != nil {
		return "", nil, err
	}
	defer file.Close()
	filename := file.Name()
	{
		err = os.Chmod(filename, 0600)
		if err != nil {
			return "", nil, err
		}
		privKey, err := key.GetString("private_key")
		if err != nil {
			return "", nil, err
		}
		_, err = file.Write([]byte(privKey))
		if err != nil {
			return "", nil, err
		}
	}
	cmd.AppendArgs("-i", filename)
	cmd.AppendArgs("-q")
	cmd.AppendArgs("-o", "StrictHostKeyChecking=no")
	cmd.AppendArgs("-o", "GlobalKnownHostsFile=/dev/null")
	cmd.AppendArgs("-o", "UserKnownHostsFile=/dev/null")
	cmd.AppendArgs("-o", "PasswordAuthentication=no")
	cmd.AppendArgs("-p", fmt.Sprintf("%d", port))
	cmd.AppendArgs(fmt.Sprintf("%s@%s", ansible.PUBLIC_CLOUD_ANSIBLE_USER, ip))
	return filename, cmd, nil
}

func NewSSHtoolSolCommand(ctx context.Context, userCred mcclient.TokenCredential, ip string, query jsonutils.JSONObject) (*SSHtoolSol, error) {
	port := 22
	if query != nil {
		if _port, _ := query.Int("webconsole", "port"); _port != 0 {
			port = int(_port)
		}
	}
	conn, err := net.DialTimeout("tcp", fmt.Sprintf("%s:%d", ip, port), time.Second*2)
	if err != nil {
		return nil, fmt.Errorf("IPAddress %s:%d not accessible", ip, port)
	}
	defer conn.Close()

	keyFile, cmd, err := getCommand(ctx, userCred, ip, port)
	if err != nil {
		log.Errorf("getCommand error: %v", err)
	}

	return &SSHtoolSol{
		BaseCommand: cmd,
		IP:          ip,
		Port:        port,
		Username:    "",
		reTry:       0,
		showInfo:    fmt.Sprintf("%s login: ", ip),
		keyFile:     keyFile,
	}, nil
}

func (c *SSHtoolSol) GetCommand() *exec.Cmd {
	if c.BaseCommand != nil {
		cmd := c.BaseCommand.GetCommand()
		cmd.Env = append(cmd.Env, "TERM=xterm-256color")
		return cmd
	}
	return nil
}

func (c *SSHtoolSol) Cleanup() error {
	if len(c.keyFile) > 0 {
		os.Remove(c.keyFile)
		c.keyFile = ""
	}
	return nil
}

func (c *SSHtoolSol) GetProtocol() string {
	return PROTOCOL_TTY
}

func (c *SSHtoolSol) Connect() error {
	conn, err := net.DialTimeout("tcp", fmt.Sprintf("%s:%d", c.IP, c.Port), time.Second*2)
	if err != nil {
		return err
	}
	defer conn.Close()
	return nil
}

func (c *SSHtoolSol) GetData(data string) (isShow bool, ouput string, command string) {
	if len(c.Username) == 0 {
		if len(data) == 0 {
			//用户名不能为空
			return true, c.showInfo, ""
		}
		c.Username = data
		return false, "Password:", ""
	}
	args := []string{
		o.Options.SshpassToolPath, "-p", data,
		o.Options.SshToolPath, "-p", fmt.Sprintf("%d", c.Port), fmt.Sprintf("%s@%s", c.Username, c.IP),
		"-oGlobalKnownHostsFile=/dev/null",
		"-oUserKnownHostsFile=/dev/null",
		"-oStrictHostKeyChecking=no",
		"-oPreferredAuthentications=password,keyboard-interactive",
		"-oPubkeyAuthentication=no", //密码登录时,避免搜寻秘钥登录
	}
	return true, "", strings.Join(args, " ")
}

func (c *SSHtoolSol) ShowInfo() string {
	c.Username = ""
	c.reTry++
	if c.reTry == 3 {
		c.reTry = 0
		//清屏
		time.Sleep(1 * time.Second)
		return "\033c " + c.showInfo
	}
	return c.showInfo
}