'use strict';

window.eval = global.eval = () => {
  throw new Error('Sorry, Mattermost does not support window.eval() for security reasons.');
};

const React = require('react');
const ReactDOM = require('react-dom');
const ReactBootstrap = require('react-bootstrap');

const Grid = ReactBootstrap.Grid;
const Row = ReactBootstrap.Row;
const Col = ReactBootstrap.Col;
const Nav = ReactBootstrap.Nav;
const NavItem = ReactBootstrap.NavItem;

const LoginModal = require('./components/loginModal.jsx');

const {remote, ipcRenderer, shell} = require('electron');
const electronContextMenu = require('electron-context-menu');

const osLocale = require('os-locale');
const fs = require('fs');
const url = require('url');

const settings = require('../common/settings');
const badge = require('./js/badge');

remote.getCurrentWindow().removeAllListeners('focus');

var config;
try {
  var configFile = remote.getGlobal('config-file');
  config = settings.readFileSync(configFile);
} catch (e) {
  window.location = 'settings.html';
}
if (config.teams.length === 0) {
  window.location = 'settings.html';
}

var MainPage = React.createClass({
  getInitialState() {
    return {
      key: 0,
      unreadCounts: new Array(this.props.teams.length),
      mentionCounts: new Array(this.props.teams.length),
      unreadAtActive: new Array(this.props.teams.length),
      mentionAtActiveCounts: new Array(this.props.teams.length),
      loginQueue: []
    };
  },
  componentDidMount() {
    var self = this;
    ipcRenderer.on('login-request', (event, request, authInfo) => {
      self.setState({
        loginRequired: true
      });
      const loginQueue = self.state.loginQueue;
      loginQueue.push({
        request,
        authInfo
      });
      self.setState({
        loginQueue
      });
    });

    // can't switch tabs sequencially for some reason...
    ipcRenderer.on('switch-tab', (event, key) => {
      this.handleSelect(key);
    });
    ipcRenderer.on('select-next-tab', () => {
      this.handleSelect(this.state.key + 1);
    });
    ipcRenderer.on('select-previous-tab', () => {
      this.handleSelect(this.state.key - 1);
    });

    // reload the activated tab
    ipcRenderer.on('reload-tab', () => {
      this.refs[`mattermostView${this.state.key}`].reload();
    });
    ipcRenderer.on('clear-cache-and-reload-tab', () => {
      this.refs[`mattermostView${this.state.key}`].clearCacheAndReload();
    });

    // activate search box in current tab
    ipcRenderer.on('activate-search-box', () => {
      const webview = document.getElementById('mattermostView' + self.state.key);
      webview.send('activate-search-box');
    });

    // activate search box in current chunnel
    ipcRenderer.on('activate-search-box-in-channel', () => {
      const webview = document.getElementById('mattermostView' + self.state.key);
      webview.send('activate-search-box-in-channel');
    });

    function focusListener() {
      self.handleOnTeamFocused(self.state.key);
      self.refs[`mattermostView${self.state.key}`].focusOnWebView();
    }

    var currentWindow = remote.getCurrentWindow();
    currentWindow.on('focus', focusListener);
    window.addEventListener('beforeunload', () => {
      currentWindow.removeListener('focus', focusListener);
    });

    //goBack and goForward
    ipcRenderer.on('go-back', () => {
      const mattermost = self.refs[`mattermostView${self.state.key}`];
      if (mattermost.canGoBack()) {
        mattermost.goBack();
      }
    });

    ipcRenderer.on('go-forward', () => {
      const mattermost = self.refs[`mattermostView${self.state.key}`];
      if (mattermost.canGoForward()) {
        mattermost.goForward();
      }
    });
  },
  componentDidUpdate(prevProps, prevState) {
    if (prevState.key !== this.state.key) { // i.e. When tab has been changed
      this.refs[`mattermostView${this.state.key}`].focusOnWebView();
    }
  },
  handleSelect(key) {
    const newKey = (this.props.teams.length + key) % this.props.teams.length;
    this.setState({
      key: newKey
    });
    this.handleOnTeamFocused(newKey);

    var webview = document.getElementById('mattermostView' + newKey);
    ipcRenderer.send('update-title', {
      title: webview.getTitle()
    });
  },
  handleUnreadCountChange(index, unreadCount, mentionCount, isUnread, isMentioned) {
    var unreadCounts = this.state.unreadCounts;
    var mentionCounts = this.state.mentionCounts;
    var unreadAtActive = this.state.unreadAtActive;
    var mentionAtActiveCounts = this.state.mentionAtActiveCounts;
    unreadCounts[index] = unreadCount;
    mentionCounts[index] = mentionCount;

    // Never turn on the unreadAtActive flag at current focused tab.
    if (this.state.key !== index || !remote.getCurrentWindow().isFocused()) {
      unreadAtActive[index] = unreadAtActive[index] || isUnread;
      if (isMentioned) {
        mentionAtActiveCounts[index]++;
      }
    }
    this.setState({
      unreadCounts,
      mentionCounts,
      unreadAtActive,
      mentionAtActiveCounts
    });
    this.handleUnreadCountTotalChange();
  },
  markReadAtActive(index) {
    var unreadAtActive = this.state.unreadAtActive;
    var mentionAtActiveCounts = this.state.mentionAtActiveCounts;
    unreadAtActive[index] = false;
    mentionAtActiveCounts[index] = 0;
    this.setState({
      unreadAtActive,
      mentionAtActiveCounts
    });
    this.handleUnreadCountTotalChange();
  },
  handleUnreadCountTotalChange() {
    if (this.props.onUnreadCountChange) {
      var allUnreadCount = this.state.unreadCounts.reduce((prev, curr) => {
        return prev + curr;
      }, 0);
      this.state.unreadAtActive.forEach((state) => {
        if (state) {
          allUnreadCount += 1;
        }
      });
      var allMentionCount = this.state.mentionCounts.reduce((prev, curr) => {
        return prev + curr;
      }, 0);
      this.state.mentionAtActiveCounts.forEach((count) => {
        allMentionCount += count;
      });
      this.props.onUnreadCountChange(allUnreadCount, allMentionCount);
    }
  },
  handleOnTeamFocused(index) {
    // Turn off the flag to indicate whether unread message of active channel contains at current tab.
    this.markReadAtActive(index);
  },

  visibleStyle(visible) {
    var visibility = visible ? 'visible' : 'hidden';
    return {
      position: 'absolute',
      top: (this.props.teams.length > 1) ? 42 : 0,
      right: 0,
      bottom: 0,
      left: 0,
      visibility
    };
  },

  handleLogin(request, username, password) {
    ipcRenderer.send('login-credentials', request, username, password);
    const loginQueue = this.state.loginQueue;
    loginQueue.shift();
    this.setState(loginQueue);
  },
  handleLoginCancel() {
    const loginQueue = this.state.loginQueue;
    loginQueue.shift();
    this.setState(loginQueue);
  },
  render() {
    var self = this;

    var tabsRow;
    if (this.props.teams.length > 1) {
      tabsRow = (
        <Row>
          <TabBar
            id='tabBar'
            teams={this.props.teams}
            unreadCounts={this.state.unreadCounts}
            mentionCounts={this.state.mentionCounts}
            unreadAtActive={this.state.unreadAtActive}
            mentionAtActiveCounts={this.state.mentionAtActiveCounts}
            activeKey={this.state.key}
            onSelect={this.handleSelect}
          />
        </Row>
      );
    }

    var views = this.props.teams.map((team, index) => {
      function handleUnreadCountChange(unreadCount, mentionCount, isUnread, isMentioned) {
        self.handleUnreadCountChange(index, unreadCount, mentionCount, isUnread, isMentioned);
      }
      function handleNotificationClick() {
        self.handleSelect(index);
      }
      var id = 'mattermostView' + index;
      var isActive = self.state.key === index;
      return (
        <MattermostView
          key={id}
          id={id}
          style={self.visibleStyle(isActive)}
          src={team.url}
          name={team.name}
          onUnreadCountChange={handleUnreadCountChange}
          onNotificationClick={handleNotificationClick}
          ref={id}
          active={isActive}
        />);
    });
    var viewsRow = (
      <Row>
        {views}
      </Row>);

    var request = null;
    var authServerURL = null;
    var authInfo = null;
    if (this.state.loginQueue.length !== 0) {
      request = this.state.loginQueue[0].request;
      const tmpURL = url.parse(this.state.loginQueue[0].request.url);
      authServerURL = `${tmpURL.protocol}//${tmpURL.host}`;
      authInfo = this.state.loginQueue[0].authInfo;
    }
    return (
      <div>
        <LoginModal
          show={this.state.loginQueue.length !== 0}
          request={request}
          authInfo={authInfo}
          authServerURL={authServerURL}
          onLogin={this.handleLogin}
          onCancel={this.handleLoginCancel}
        />
        <Grid fluid>
          { tabsRow }
          { viewsRow }
        </Grid>
      </div>
    );
  }
});

var TabBar = React.createClass({
  render() {
    var self = this;
    var tabs = this.props.teams.map((team, index) => {
      var unreadCount = 0;
      var badgeStyle = {
        background: '#FF1744',
        float: 'right',
        color: 'white',
        minWidth: '19px',
        fontSize: '12px',
        textAlign: 'center',
        lineHeight: '20px',
        height: '19px',
        marginLeft: '5px',
        borderRadius: '50%'
      };

      if (self.props.unreadCounts[index] > 0) {
        unreadCount = self.props.unreadCounts[index];
      }
      if (self.props.unreadAtActive[index]) {
        unreadCount += 1;
      }

      var mentionCount = 0;
      if (self.props.mentionCounts[index] > 0) {
        mentionCount = self.props.mentionCounts[index];
      }
      if (self.props.mentionAtActiveCounts[index] > 0) {
        mentionCount += self.props.mentionAtActiveCounts[index];
      }

      var badgeDiv;
      if (mentionCount !== 0) {
        badgeDiv = (
          <div style={badgeStyle}>
            {mentionCount}
          </div>);
      }
      var id = 'teamTabItem' + index;
      if (unreadCount === 0) {
        return (
          <NavItem
            className='teamTabItem'
            key={id}
            id={id}
            eventKey={index}
          >
            { team.name }
            { ' ' }
            { badgeDiv }
          </NavItem>);
      }
      return (
        <NavItem
          className='teamTabItem'
          key={id}
          id={id}
          eventKey={index}
        >
          <b>{ team.name }</b>
          { ' ' }
          { badgeDiv }
        </NavItem>);
    });
    return (
      <Nav
        id={this.props.id}
        bsStyle='tabs'
        activeKey={this.props.activeKey}
        onSelect={this.props.onSelect}
      >
        { tabs }
      </Nav>
    );
  }
});

var MattermostView = React.createClass({
  getInitialState() {
    return {
      errorInfo: null
    };
  },
  handleUnreadCountChange(unreadCount, mentionCount, isUnread, isMentioned) {
    if (this.props.onUnreadCountChange) {
      this.props.onUnreadCountChange(unreadCount, mentionCount, isUnread, isMentioned);
    }
  },

  componentDidMount() {
    var self = this;
    var webview = ReactDOM.findDOMNode(this.refs.webview);

    // This option disables the same-origin policy and allows js/css/plugins not only content like images.
    if (config.disablewebsecurity === true) {
      // webview.setAttribute('disablewebsecurity', false) disables websecurity. (electron's bug?)
      webview.setAttribute('disablewebsecurity', true);
    }

    webview.addEventListener('did-fail-load', (e) => {
      console.log(self.props.name, 'webview did-fail-load', e);
      if (e.errorCode === -3) { // An operation was aborted (due to user action).
        return;
      }

      self.setState({
        errorInfo: e
      });
      function reload() {
        window.removeEventListener('online', reload);
        self.reload();
      }
      if (navigator.onLine) {
        setTimeout(reload, 30000);
      } else {
        window.addEventListener('online', reload);
      }
    });

    // Open link in browserWindow. for exmaple, attached files.
    webview.addEventListener('new-window', (e) => {
      var currentURL = url.parse(webview.getURL());
      var destURL = url.parse(e.url);
      if (destURL.protocol !== 'http:' && destURL.protocol !== 'https:') {
        ipcRenderer.send('confirm-protocol', destURL.protocol, e.url);
        return;
      }
      if (currentURL.host === destURL.host) {
        // New window should disable nodeIntergration.
        window.open(e.url, 'Mattermost', 'nodeIntegration=no');
      } else {
        // if the link is external, use default browser.
        shell.openExternal(e.url);
      }
    });

    webview.addEventListener('dom-ready', () => {
      // webview.openDevTools();

      // Use 'Meiryo UI' and 'MS Gothic' to prevent CJK fonts on Windows(JP).
      if (process.platform === 'win32') {
        function applyCssFile(cssFile) {
          fs.readFile(cssFile, 'utf8', (err, data) => {
            if (err) {
              console.log(err);
              return;
            }
            webview.insertCSS(data);
          });
        }

        osLocale((err, locale) => {
          if (err) {
            console.log(err);
            return;
          }
          if (locale === 'ja_JP') {
            applyCssFile(__dirname + '/css/jp_fonts.css');
          }
        });
      }

      electronContextMenu({
        window: webview
      });
    });

    webview.addEventListener('ipc-message', (event) => {
      switch (event.channel) {
      case 'onUnreadCountChange':
        var unreadCount = event.args[0];
        var mentionCount = event.args[1];

        // isUnread and isMentioned is pulse flag.
        var isUnread = event.args[2];
        var isMentioned = event.args[3];
        self.handleUnreadCountChange(unreadCount, mentionCount, isUnread, isMentioned);
        break;
      case 'onNotificationClick':
        self.props.onNotificationClick();
        break;
      }
    });

    webview.addEventListener('page-title-updated', (event) => {
      if (self.props.active) {
        ipcRenderer.send('update-title', {
          title: event.title
        });
      }
    });

    webview.addEventListener('console-message', (e) => {
      const message = `[${this.props.name}] ${e.message}`;
      switch (e.level) {
      case 0:
        console.log(message);
        break;
      case 1:
        console.warn(message);
        break;
      case 2:
        console.error(message);
        break;
      default:
        console.log(message);
        break;
      }
    });
  },
  reload() {
    this.setState({
      errorInfo: null
    });
    var webview = ReactDOM.findDOMNode(this.refs.webview);
    webview.reload();
  },
  clearCacheAndReload() {
    this.setState({
      errorInfo: null
    });
    var webContents = ReactDOM.findDOMNode(this.refs.webview).getWebContents();
    webContents.session.clearCache(() => {
      webContents.reload();
    });
  },

  focusOnWebView() {
    const webview = ReactDOM.findDOMNode(this.refs.webview);
    if (!webview.getWebContents().isFocused()) {
      webview.focus();
      webview.getWebContents().focus();
    }
  },

  canGoBack() {
    const webview = ReactDOM.findDOMNode(this.refs.webview);
    return webview.getWebContents().canGoBack();
  },

  canGoForward() {
    const webview = ReactDOM.findDOMNode(this.refs.webview);
    return webview.getWebContents().canGoForward();
  },

  goBack() {
    const webview = ReactDOM.findDOMNode(this.refs.webview);
    webview.getWebContents().goBack();
  },

  goForward() {
    const webview = ReactDOM.findDOMNode(this.refs.webview);
    webview.getWebContents().goForward();
  },

  render() {
    const errorView = this.state.errorInfo ? (
      <ErrorView
        id={this.props.id + '-fail'}
        style={this.props.style}
        className='errorView'
        errorInfo={this.state.errorInfo}
      />) : null;

    // 'disablewebsecurity' is necessary to display external images.
    // However, it allows also CSS/JavaScript.
    // So webview should use 'allowDisplayingInsecureContent' as same as BrowserWindow.

    // Need to keep webview mounted when failed to load.
    return (
      <div>
        { errorView }
        <webview
          id={this.props.id}
          className='mattermostView'
          style={this.props.style}
          preload='webview/mattermost.js'
          src={this.props.src}
          ref='webview'
          nodeintegration='false'
        />
      </div>);
  }
});

// ErrorCode: https://code.google.com/p/chromium/codesearch#chromium/src/net/base/net_error_list.h
const errorPage = {
  tableStyle: {
    display: 'table',
    width: '100%',
    height: '100%',
    position: 'absolute',
    top: '0',
    left: '0'
  },

  cellStyle: {
    display: 'table-cell',
    verticalAlign: 'top',
    paddingTop: '2em'
  },

  bullets: {
    paddingLeft: '15px',
    lineHeight: '1.7'
  },

  techInfo: {
    fontSize: '12px',
    color: '#aaa'
  }
};

var ErrorView = React.createClass({
  render() {
    return (
      <Grid
        id={this.props.id}
        style={this.props.style}
      >
        <div style={errorPage.tableStyle}>
          <div style={errorPage.cellStyle}>
            <Row>
              <Col
                xs={0}
                sm={1}
                md={1}
                lg={2}
              />
              <Col
                xs={12}
                sm={10}
                md={10}
                lg={8}
              >
                <h2>{'Cannot connect to Mattermost'}</h2>
                <hr/>
                <p>{'We\'re having trouble connecting to Mattermost. If refreshing this page (Ctrl+R or Command+R) does not work please verify that:'}</p>
                <br/>
                <ul style={errorPage.bullets}>
                  <li>{'Your computer is connected to the internet.'}</li>
                  <li>{'The Mattermost URL '}
                    <a href={this.props.errorInfo.validatedURL}>
                      {this.props.errorInfo.validatedURL}
                    </a>{' is correct.'}</li>
                  <li>{'You can reach '}
                    <a href={this.props.errorInfo.validatedURL}>
                      {this.props.errorInfo.validatedURL}
                    </a>{' from a browser window.'}</li>
                </ul>
                <br/>
                <div style={errorPage.techInfo}>
                  {this.props.errorInfo.errorDescription}{' ('}
                  {this.props.errorInfo.errorCode }{')'}</div>
              </Col>
              <Col
                xs={0}
                sm={1}
                md={1}
                lg={2}
              />
            </Row>
          </div>
        </div>
      </Grid>
    );
  }
});

function showUnreadBadgeWindows(unreadCount, mentionCount) {
  function sendBadge(dataURL, description) {
    // window.setOverlayIcon() does't work with NativeImage across remote boundaries.
    // https://github.com/atom/electron/issues/4011
    ipcRenderer.send('update-unread', {
      overlayDataURL: dataURL,
      description,
      unreadCount,
      mentionCount
    });
  }

  if (mentionCount > 0) {
    const dataURL = badge.createDataURL(mentionCount.toString());
    sendBadge(dataURL, 'You have unread mentions (' + mentionCount + ')');
  } else if (unreadCount > 0 && config.showUnreadBadge) {
    const dataURL = badge.createDataURL('•');
    sendBadge(dataURL, 'You have unread channels (' + unreadCount + ')');
  } else {
    sendBadge(null, 'You have no unread messages');
  }
}

function showUnreadBadgeOSX(unreadCount, mentionCount) {
  if (mentionCount > 0) {
    remote.app.dock.setBadge(mentionCount.toString());
  } else if (unreadCount > 0 && config.showUnreadBadge) {
    remote.app.dock.setBadge('•');
  } else {
    remote.app.dock.setBadge('');
  }

  ipcRenderer.send('update-unread', {
    unreadCount,
    mentionCount
  });
}

function showUnreadBadgeLinux(unreadCount, mentionCount) {
  if (remote.app.isUnityRunning()) {
    remote.app.setBadgeCount(mentionCount);
  }

  ipcRenderer.send('update-unread', {
    unreadCount,
    mentionCount
  });
}

function showUnreadBadge(unreadCount, mentionCount) {
  switch (process.platform) {
  case 'win32':
    showUnreadBadgeWindows(unreadCount, mentionCount);
    break;
  case 'darwin':
    showUnreadBadgeOSX(unreadCount, mentionCount);
    break;
  case 'linux':
    showUnreadBadgeLinux(unreadCount, mentionCount);
    break;
  default:
  }
}

ReactDOM.render(
  <MainPage
    teams={config.teams}
    onUnreadCountChange={showUnreadBadge}
  />,
  document.getElementById('content')
);