/**
 * 虚拟终端模块
 * 更新：2016/04/13
 * 作者：蚁逅 <https://github.com/antoor>
 */
const LANG = antSword['language']['terminal'];
const LANG_T = antSword['language']['toastr'];

class Terminal {

  constructor(opts, options={}) {
    // 生存一个随机ID，用于标识多个窗口dom
    const hash = String(Math.random()).substr(2, 10);

    // 初始化UI::tabbar
    const tabbar = antSword['tabbar'];
    tabbar.addTab(
      `tab_terminal_${hash}`,
      `<i class="fa fa-terminal"></i> ${opts['ip']}`,
      null, null, true, true
    );
    tabbar.attachEvent('onTabClick', (id,lid) => {
      if (id !== `tab_terminal_${hash}`) { return };
      this.term ? this.term.focus() : 0;
    });
    // 初始化UI::cell
    const cell = tabbar.cells(`tab_terminal_${hash}`);
    cell.attachHTMLString(`
      <div
        id="div_terminal_${hash}"
        style="height:100%;margin:0;padding:0 5px 1px 5px;overflow:scroll;--size:1;"
      ></div>
    `);

    this.path = '';
    this.opts = opts;
    this.options = options || {};
    this.hash = hash;
    this.term = null;
    this.cell = cell;
    this.isWin = true;
    this.isPowershell = false;
    this.sessbin = null;
    this.sess_powershell = null;
    this.core = new antSword['core'][opts['type']](opts);
    this.cache = new antSword['CacheManager'](this.opts['_id']);

    this
      .getInformation()
      .then((ret) => {
        this.initTerminal(ret['info'], ret['dom']);
        if(this.options.hasOwnProperty("path")) {
          if(this.isWin && this.path.substr(0,1).toUpperCase() != this.options.path.substr(0,1).toUpperCase()) {
            this.term.exec(`${this.options.path.substr(0,1).toUpperCase()}:`);
          }
          this.term.exec(`cd ${this.options.path}`);
        }
      })
      .catch((err) => {
        toastr.error((typeof(err) === 'object') ? JSON.stringify(err) : String(err), LANG_T['error']);
        this.cell.progressOff();
        this.cell.close();
      })
  }

  /**
   * 获取目标信息
   * @return {Promise} 返回一个Promise操作对象//{dom,info}
   */
  getInformation() {
    return new Promise((ret, rej) => {
      // 获取DOM
      const dom = $(`#div_terminal_${this.hash}`);
      // 获取缓存
      let infoCache = this.cache.get('info');
      // 如果有缓存？初始化终端：获取信息&&保存缓存&&初始化终端
      if (infoCache) {
        return ret({
          dom: dom,
          info: infoCache
        });
      }
      // 开始获取信息
      this.cell.progressOn();
      this.core.request(
        this.core.base.info()
      ).then((_ret) => {
        this.cell.progressOff();
        this.cache.set('info', _ret['text']);
        return ret({
          dom: dom,
          info: _ret['text']
        });
      }).catch((e) => {
        rej(e);
      });
    });
  }

  /**
   * 初始化终端
   * @param  {String} ret 目标信息
   * @param  {Object} dom 要操作的dom元素
   * @return {None}     [description]
   */
  initTerminal(ret, dom) {
    let self = this;
    let info = ret.split('\t');
    let infoUser, infoPath, infoDrive, infoSystem;
    let banner = `[[b;cyan;](*) ${LANG['banner']['title']}]`;

    // 判断数据是否正确
    if (info.length === 4) {
      infoPath = info[0];
      infoDrive = info[1];
      infoSystem = info[2];
      infoUser = info[3];
    } else if (info.length === 2) {
      infoPath = info[0];
      infoDrive = info[1];
    } else {
      toastr.error('Loading infomations failed!<br/>' + ret, LANG_T['error']);
      this.cache.del('info');
      return this.cell.close();
    }

    // 转换路径特殊字符
    infoPath = infoPath.replace(/\\/g, '/').replace(/\.$/, '');

    // 判断是否为!win
    this.isWin = !(infoPath.substr(0, 1) === '/')
    this.path = infoPath;

    // 组合banner
    banner += `\n[[b;#99A50D;]${LANG['banner']['path']}]: [[;#C3C3C3;]${infoPath}]`;
    banner += `\n[[b;#99A50D;]${LANG['banner']['drive']}]: [[;#C3C3C3;]${infoDrive}]`;
    if (info.length === 4) {
      banner += `\n[[b;#99A50D;]${LANG['banner']['system']}]: [[;#C3C3C3;]${infoSystem}]`;
      banner += `\n[[b;#99A50D;]${LANG['banner']['user']}]: [[;#C3C3C3;]${infoUser}]`;
    }

    // 初始化终端
    this.term = dom.terminal( (cmd, term) => {
      if (!cmd) { return false }
      // 如果为exit||quit则关闭窗口
      if (cmd === 'exit' || cmd === 'quit') { return this.cell.close() }
      // clear清空
      if (cmd === 'cls' || cmd === 'clear') { return term.clear() }
      
      if (cmd === 'ashelp'){
        term.echo(LANG['ascmd']['ashelp']);
        return;
      }
      if (cmd === 'aslistcmd'){
        var binarr = "";
        if (this.isWin) {
          binarr = [
            "C:/Windows/System32/cmd.exe",
            "C:/Windows/SysWOW64/cmd.exe",
            "C:/Windows/System32/WindowsPowerShell/v1.0/powershell.exe",
            "C:/Windows/SysWOW64/WindowsPowerShell/v1.0/powershell.exe",
            "C:/Windows/System32/WindowsPowerShell/v2.0/powershell.exe",
            "C:/Windows/SysWOW64/WindowsPowerShell/v2.0/powershell.exe",
            "C:/Windows/System32/WindowsPowerShell/v3.0/powershell.exe",
            "C:/Windows/SysWOW64/WindowsPowerShell/v3.0/powershell.exe",
            "C:/Windows/System32/WindowsPowerShell/v4.0/powershell.exe",
            "C:/Windows/SysWOW64/WindowsPowerShell/v4.0/powershell.exe",
          ].join(',');
        }else{
          binarr = [
            "/bin/sh",
            "/bin/ash",
            "/bin/bash",
            "/bin/zsh",
            "/bin/busybox",
          ].join(',');
        }
        this.core.request(
          this.core.command.listcmd({
            binarr: binarr,
          })
        ).then((ret) => {
          let res = ret['text'];
          if(res.indexOf("ERROR://") > -1){
            throw res;
          }
          let result = "";
          res.split('\n').map((v) => {
            var line = v.split('\t');
            if(line.length == 2){
              var r = parseInt(line[1]) === 1 ? '[[b;#15af63;]OK]' : '[[b;#E80000;]FAIL]';
              result += `${line[0]}\t\t\t${r}\n`;
            }
          });
          term.echo(result);
          term.resume();
        }).catch((err) => {
          term.resume();
        });
        return;
      }
      if ( cmd.substr(0,5) === 'ascmd') {
        var sessbin = cmd.substr(5).trim();
        if(sessbin.length>0){
          self.sessbin = sessbin;
          term.echo(LANG['ascmd']['ascmd'](self.sessbin));
        }else{
          term.echo(LANG['ascmd']['ashelp']);
        }
        return;
      }
      if ( cmd.substr(0,12) === 'aspowershell') {
        var _switch = cmd.substr(12).trim().toLowerCase();
        if(_switch === "on") {
          self.sess_powershell = true;
          term.echo(LANG['ascmd']['aspowershell']["on"]);
        }else {
          self.sess_powershell = false;
          term.echo(LANG['ascmd']['aspowershell']["off"]);
        }
        return;
      }
      term.pause();
      // 是否有缓存
      let cacheTag = 'command-' + Buffer.from(this.path + cmd).toString('base64');
      let cacheCmd = this.cache.get(cacheTag);
      if (
        (this.opts.otherConf || {})['terminal-cache'] === 1 && cacheCmd
      ) {
        term.echo(
          antSword.noxss(cacheCmd, false)
        );
        return term.resume();
      };
      // 获取自定义执行路径
      let _bin = this.isWin ? 'cmd' : '/bin/sh';
      let _confBin = (this.opts['otherConf'] || {})['command-path'];
      _bin = _confBin || _bin;
      if(self.sessbin !== null) {
        _bin = self.sessbin;
      }
      if(self.isWin && _bin.indexOf("powershell") > -1) {
        self.isPowershell = true
      }else{
        self.isPowershell = false
      }
      if(self.sess_powershell !== null) {
        self.isPowershell = self.sess_powershell;
      }
      // 开始执行命令
      this.core.request(
        this.core.command.exec({
          cmd: this.parseCmd(cmd, this.path),
          bin: _bin
        })
      ).then((ret) => {
        let _ = ret['text'];
        // 解析出命令执行路径
        const indexS = _.lastIndexOf('[S]');
        const indexE = _.lastIndexOf('[E]');
        let _path = _.substr(indexS + 3, indexE - indexS - 3);

        let output = _.replace(`[S]${_path}[E]`, '');
        _path = _path.replace(/\n/g, '').replace(/\r/g, '');

        this.path = _path || this.path;
        term.set_prompt(this.parsePrompt(infoUser));

        // 去除换行符
        [
          /\n\n$/, /^\n\n/, /\r\r$/,
          /^\r\r/, /\r\n$/, /^\r\n/,
          /\n\r$/, /^\n\r/, /\r$/,
          /^\r/, /\n$/, /^\n/
        ].map((_) => {
          output = output.replace(_, '');
        });
        if (output.length > 0) {
          term.echo(
            antSword.noxss(output, false)
          );
          // 保存最大100kb数据
          if (output.length < (1024 * 1024)) {
            this.cache.set(cacheTag, output);
          };
        };
        term.resume();
      }).catch((_) => {
        // term.error('ERR: ' + (_ instanceof Object) ? JSON.stringify(_) : String(_));
        term.resume();
      });
    }, {
        greetings: banner,
        name: `terminal_${this.hash}`,
        prompt: this.parsePrompt(infoUser),
        numChars: 2048,
        exit: false,
        // < 1.0.0 时使用3个参数 completion: (term, value, callback) => {}
        completion: (value, callback) => {
          callback([
            'ashelp', 'ascmd', 'aslistcmd', 'aspowershell', 'quit', 'exit'
          ].concat(
            this.isWin ? [
              'dir', 'whoami', 'net', 'ipconfig', 'netstat', 'cls',
              'wscript', 'nslookup', 'copy', 'del', 'ren', 'md', 'type',
              'ping'
            ] : [
              'cd', 'ls', 'find', 'cp', 'mv', 'rm', 'ps', 'kill',
              'file', 'tar', 'cat', 'chown', 'chmod', 'pwd', 'history',
              'whoami', 'ifconfig', 'clear',
              'ping'
            ]
          ))
        },
        keydown: (event, terminal) => {
          if(event.ctrlKey == true) {
            // ctrl 键按下
            switch(event.keyCode) {
              case 187: // 放大 ctrl +
                var s = parseFloat(terminal[0].style.getPropertyValue("--size"));
                if(isNaN(s)){
                  s = 1;
                }
                if(s<5){
                  s += 0.05;
                }
                terminal[0].style.setProperty("--size", s);
                return false;
              case 189: // 缩小 ctrl -
                var s = parseFloat(terminal[0].style.getPropertyValue("--size"));
                if(isNaN(s)){
                  s = 1;
                }
                if(s>0.5){
                  s -= 0.05;
                }
                terminal[0].style.setProperty("--size", s);
                return false;
              default:
              break;
            }
          }
        }
    });
    this.term.echo(`[[b;cyan;](*) ${LANG['ascmd']['help']}]`);
  }

  /**
   * 根据执行命令&&路径生成最终command
   * @param  {String} cmd  要执行的命令
   * @param  {String} path 当前路径
   * @return {String}      最终执行命令
   */
  parseCmd(cmd, path) {
    path = path.replace(/\\\\/g, '\\').replace(/"/g, '\\"').replace(/\\/g, '\\\\');
    return (this.isWin
      ? this.isPowershell? `cd "${path}";${cmd};echo [S];(pwd).path;echo [E]`:`cd /d "${path}"&${cmd}&echo [S]&cd&echo [E]`
      : `cd "${path}";${cmd};echo [S];pwd;echo [E]`
    );
  }

  /**
   * 生成路径提示符
   * @param  {String} user 当前用户名
   * @return {String}      term输出字符串
   */
  parsePrompt(user) {
    return antSword.noxss(this.isWin
      ? `[[b;white;]${this.path.replace(/\//g, '\\')}> ]`
      : (user ? `([[b;#E80000;]${user}]:[[;#0F93D2;]` : '[[;0F93D2;]') + this.path + ']) $ '
    );
  }

}

// export default Terminal;
module.exports = Terminal;
