// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

cr.define('identity_internals', function() {
  'use strict';

  /**
   * Creates an identity token item.
   * @param {!Object} tokenInfo Object containing token information.
   * @constructor
   */
  function TokenListItem(tokenInfo) {
    const el = cr.doc.createElement('div');
    el.data_ = tokenInfo;
    el.__proto__ = TokenListItem.prototype;
    el.decorate();
    return el;
  }

  TokenListItem.prototype = {
    __proto__: HTMLDivElement.prototype,

    /** @override */
    decorate: function() {
      this.textContent = '';
      this.id = this.data_.accessToken;

      const table = this.ownerDocument.createElement('table');
      const tbody = this.ownerDocument.createElement('tbody');
      tbody.appendChild(this.createEntry_(
          'Access Token', this.data_.accessToken, 'access-token'));
      tbody.appendChild(this.createEntry_(
          'Extension Name', this.data_.extensionName, 'extension-name'));
      tbody.appendChild(this.createEntry_(
          'Extension Id', this.data_.extensionId, 'extension-id'));
      tbody.appendChild(
          this.createEntry_('Token Status', this.data_.status, 'token-status'));
      tbody.appendChild(this.createEntry_(
          'Expiration Time', this.data_.expirationTime, 'expiration-time'));
      tbody.appendChild(this.createEntryForScopes_());
      table.appendChild(tbody);
      const tfoot = this.ownerDocument.createElement('tfoot');
      tfoot.appendChild(this.createButtons_());
      table.appendChild(tfoot);
      this.appendChild(table);
    },

    /**
     * Creates an entry for a single property of the token.
     * @param {string} label A label of the token's property name.
     * @param {string} value A value of the token property.
     * @param {string} accessor Additional class to tag the field for testing.
     * @return {HTMLElement} An HTML element with the property name and value.
     */
    createEntry_: function(label, value, accessor) {
      const row = this.ownerDocument.createElement('tr');
      const labelField = this.ownerDocument.createElement('td');
      labelField.classList.add('label');
      labelField.textContent = label;
      row.appendChild(labelField);
      const valueField = this.ownerDocument.createElement('td');
      valueField.classList.add('value');
      valueField.classList.add(accessor);
      valueField.textContent = value;
      row.appendChild(valueField);
      return row;
    },

    /**
     * Creates an entry for a list of token scopes.
     * @return {!HTMLElement} An HTML element with scopes.
     */
    createEntryForScopes_: function() {
      const row = this.ownerDocument.createElement('tr');
      const labelField = this.ownerDocument.createElement('td');
      labelField.classList.add('label');
      labelField.textContent = 'Scopes';
      row.appendChild(labelField);
      const valueField = this.ownerDocument.createElement('td');
      valueField.classList.add('value');
      valueField.classList.add('scope-list');
      this.data_.scopes.forEach(function(scope) {
        valueField.appendChild(this.ownerDocument.createTextNode(scope));
        valueField.appendChild(this.ownerDocument.createElement('br'));
      }, this);
      row.appendChild(valueField);
      return row;
    },

    /**
     * Creates buttons for the token.
     * @return {HTMLElement} An HTML element with actionable buttons for the
     *     token.
     */
    createButtons_: function() {
      const row = this.ownerDocument.createElement('tr');
      const buttonHolder = this.ownerDocument.createElement('td');
      buttonHolder.colSpan = 2;
      buttonHolder.classList.add('token-actions');
      buttonHolder.appendChild(this.createRevokeButton_());
      row.appendChild(buttonHolder);
      return row;
    },

    /**
     * Creates a revoke button with an event sending a revoke token message
     * to the controller.
     * @return {!HTMLButtonElement} The created revoke button.
     * @private
     */
    createRevokeButton_: function() {
      const revokeButton = this.ownerDocument.createElement('button');
      revokeButton.classList.add('revoke-button');
      revokeButton.addEventListener('click', function() {
        chrome.send(
            'identityInternalsRevokeToken',
            [this.data_.extensionId, this.data_.accessToken]);
      }.bind(this));
      revokeButton.textContent = 'Revoke';
      return revokeButton;
    },
  };

  /**
   * Creates a new list of identity tokens.
   * @param {Object=} opt_propertyBag Optional properties.
   * @constructor
   * @extends {cr.ui.div}
   */
  const TokenList = cr.ui.define('div');

  TokenList.prototype = {
    __proto__: HTMLDivElement.prototype,

    /** @override */
    decorate: function() {
      this.textContent = '';
      this.showTokenNodes_();
    },

    /**
     * Populates the list of tokens.
     */
    showTokenNodes_: function() {
      this.data_.forEach(function(tokenInfo) {
        this.appendChild(new TokenListItem(tokenInfo));
      }, this);
    },

    /**
     * Removes a token node related to the specifed token ID from both the
     * internals data source as well as the user internface.
     * @param {string} accessToken The id of the token to remove.
     * @private
     */
    removeTokenNode_: function(accessToken) {
      let tokenIndex;
      for (let index = 0; index < this.data_.length; index++) {
        if (this.data_[index].accessToken == accessToken) {
          tokenIndex = index;
          break;
        }
      }

      // Remove from the data_ source if token found.
      if (tokenIndex) {
        this.data_.splice(tokenIndex, 1);
      }

      // Remove from the user interface.
      const tokenNode = $(accessToken);
      if (tokenNode) {
        this.removeChild(tokenNode);
      }
    },
  };

  let tokenList;

  /**
   * Initializes the UI by asking the contoller for list of identity tokens.
   */
  function initialize() {
    chrome.send('identityInternalsGetTokens');
    tokenList = $('token-list');
    tokenList.data_ = [];
    tokenList.__proto__ = TokenList.prototype;
    tokenList.decorate();
  }

  /**
   * Callback function accepting a list of tokens to be displayed.
   * @param {!Token[]} tokens A list of tokens to be displayed
   */
  function returnTokens(tokens) {
    tokenList.data_ = tokens;
    tokenList.showTokenNodes_();
  }

  /**
   * Callback function that removes a token from UI once it has been revoked.
   * @param {!Array<string>} accessTokens Array with a single element, which is
   * an access token to be removed.
   */
  function tokenRevokeDone(accessTokens) {
    assert(accessTokens.length > 0);
    tokenList.removeTokenNode_(accessTokens[0]);
  }

  // Return an object with all of the exports.
  return {
    initialize: initialize,
    returnTokens: returnTokens,
    tokenRevokeDone: tokenRevokeDone,
  };
});

document.addEventListener('DOMContentLoaded', identity_internals.initialize);