// Copyright (c) 2010 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('options.contentSettings', function() {
  const List = cr.ui.List;
  const ListItem = cr.ui.ListItem;
  const ArrayDataModel = cr.ui.ArrayDataModel;

  /**
   * Creates a new exceptions list item.
   * @param {string} contentType The type of the list.
   * @param {string} mode The browser mode, 'otr' or 'normal'.
   * @param {boolean} enableAskOption Whether to show an 'ask every time'
   *     option in the select.
   * @param {Object} exception A dictionary that contains the data of the
   *     exception.
   * @constructor
   * @extends {cr.ui.ListItem}
   */
  function ExceptionsListItem(contentType, mode, enableAskOption, exception) {
    var el = cr.doc.createElement('li');
    el.mode = mode;
    el.contentType = contentType;
    el.enableAskOption = enableAskOption;
    el.dataItem = exception;
    el.__proto__ = ExceptionsListItem.prototype;
    el.decorate();

    return el;
  }

  ExceptionsListItem.prototype = {
    __proto__: ListItem.prototype,

    /**
     * Called when an element is decorated as a list item.
     */
    decorate: function() {
      ListItem.prototype.decorate.call(this);

      // Labels for display mode.
      var patternLabel = cr.doc.createElement('span');
      patternLabel.textContent = this.pattern;
      this.appendChild(patternLabel);

      var settingLabel = cr.doc.createElement('span');
      settingLabel.textContent = this.settingForDisplay();
      settingLabel.className = 'exceptionSetting';
      this.appendChild(settingLabel);

      // Elements for edit mode.
      var input = cr.doc.createElement('input');
      input.type = 'text';
      this.appendChild(input);
      input.className = 'exceptionInput hidden';

      var select = cr.doc.createElement('select');
      var optionAllow = cr.doc.createElement('option');
      optionAllow.textContent = templateData.allowException;
      select.appendChild(optionAllow);

      if (this.enableAskOption) {
        var optionAsk = cr.doc.createElement('option');
        optionAsk.textContent = templateData.askException;
        select.appendChild(optionAsk);
        this.optionAsk = optionAsk;
      }

      if (this.contentType == 'cookies') {
        var optionSession = cr.doc.createElement('option');
        optionSession.textContent = templateData.sessionException;
        select.appendChild(optionSession);
        this.optionSession = optionSession;
      }

      var optionBlock = cr.doc.createElement('option');
      optionBlock.textContent = templateData.blockException;
      select.appendChild(optionBlock);

      this.appendChild(select);
      select.className = 'exceptionSetting hidden';

      // Used to track whether the URL pattern in the input is valid.
      // This will be true if the browser process has informed us that the
      // current text in the input is valid. Changing the text resets this to
      // false, and getting a response from the browser sets it back to true.
      // It starts off as false for empty string (new exceptions) or true for
      // already-existing exceptions (which we assume are valid).
      this.inputValidityKnown = this.pattern;
      // This one tracks the actual validity of the pattern in the input. This
      // starts off as true so as not to annoy the user when he adds a new and
      // empty input.
      this.inputIsValid = true;

      this.patternLabel = patternLabel;
      this.settingLabel = settingLabel;
      this.input = input;
      this.select = select;
      this.optionAllow = optionAllow;
      this.optionBlock = optionBlock;

      this.updateEditables();
      if (!this.pattern)
        input.value = templateData.examplePattern;

      var listItem = this;
      this.ondblclick = function(event) {
        // Editing notifications and geolocation is disabled for now.
        if (listItem.contentType == 'notifications' ||
            listItem.contentType == 'location')
          return;

        listItem.editing = true;
      };

      // Handle events on the editable nodes.
      input.oninput = function(event) {
        listItem.inputValidityKnown = false;
        chrome.send('checkExceptionPatternValidity',
                    [listItem.contentType, listItem.mode, input.value]);
      };

      // Handles enter and escape which trigger reset and commit respectively.
      function handleKeydown(e) {
        // Make sure that the tree does not handle the key.
        e.stopPropagation();

        // Calling list.focus blurs the input which will stop editing the list
        // item.
        switch (e.keyIdentifier) {
          case 'U+001B':  // Esc
            // Reset the inputs.
            listItem.updateEditables();
            if (listItem.pattern)
              listItem.maybeSetPatternValid(listItem.pattern, true);
          case 'Enter':
            if (listItem.parentNode)
              listItem.parentNode.focus();
        }
      }

      function handleBlur(e) {
        // When the blur event happens we do not know who is getting focus so we
        // delay this a bit since we want to know if the other input got focus
        // before deciding if we should exit edit mode.
        var doc = e.target.ownerDocument;
        window.setTimeout(function() {
          var activeElement = doc.activeElement;
          if (!listItem.contains(activeElement)) {
            listItem.editing = false;
          }
        }, 50);
      }

      input.addEventListener('keydown', handleKeydown);
      input.addEventListener('blur', handleBlur);

      select.addEventListener('keydown', handleKeydown);
      select.addEventListener('blur', handleBlur);
    },

    /**
     * The pattern (e.g., a URL) for the exception.
     * @type {string}
     */
    get pattern() {
      return this.dataItem['displayPattern'];
    },
    set pattern(pattern) {
      this.dataItem['displayPattern'] = pattern;
    },

    /**
     * The setting (allow/block) for the exception.
     * @type {string}
     */
    get setting() {
      return this.dataItem['setting'];
    },
    set setting(setting) {
      this.dataItem['setting'] = setting;
    },

    /**
     * Gets a human-readable setting string.
     * @type {string}
     */
    settingForDisplay: function() {
      var setting = this.setting;
      if (setting == 'allow')
        return templateData.allowException;
      else if (setting == 'block')
        return templateData.blockException;
      else if (setting == 'ask')
        return templateData.askException;
      else if (setting == 'session')
        return templateData.sessionException;
    },

    /**
     * Update this list item to reflect whether the input is a valid pattern
     * if |pattern| matches the text currently in the input.
     * @param {string} pattern The pattern.
     * @param {boolean} valid Whether said pattern is valid in the context of
     *     a content exception setting.
     */
    maybeSetPatternValid: function(pattern, valid) {
      // Don't do anything for messages where we are not the intended recipient,
      // or if the response is stale (i.e. the input value has changed since we
      // sent the request to analyze it).
      if (pattern != this.input.value)
        return;

      if (valid)
        this.input.setCustomValidity('');
      else
        this.input.setCustomValidity(' ');
      this.inputIsValid = valid;
      this.inputValidityKnown = true;
    },

    /**
     * Copy the data model values to the editable nodes.
     */
    updateEditables: function() {
      this.input.value = this.pattern;

      if (this.setting == 'allow')
        this.optionAllow.selected = true;
      else if (this.setting == 'block')
        this.optionBlock.selected = true;
      else if (this.setting == 'session' && this.optionSession)
        this.optionSession.selected = true;
      else if (this.setting == 'ask' && this.optionAsk)
        this.optionAsk.selected = true;
    },

    /**
     * Whether the user is currently able to edit the list item.
     * @type {boolean}
     */
    get editing() {
      return this.hasAttribute('editing');
    },
    set editing(editing) {
      var oldEditing = this.editing;
      if (oldEditing == editing)
        return;

      var listItem = this;
      var pattern = this.pattern;
      var setting = this.setting;
      var patternLabel = this.patternLabel;
      var settingLabel = this.settingLabel;
      var input = this.input;
      var select = this.select;
      var optionAllow = this.optionAllow;
      var optionBlock = this.optionBlock;
      var optionSession = this.optionSession;
      var optionAsk = this.optionAsk;

      // Just delete this row if it was added via the Add button.
      if (!editing && !pattern && !input.value) {
        var model = listItem.parentNode.dataModel;
        model.splice(model.indexOf(listItem.dataItem), 1);
        return;
      }

      // Check that we have a valid pattern and if not we do not change the
      // editing mode.
      if (!editing && (!this.inputValidityKnown || !this.inputIsValid)) {
        input.focus();
        input.select();
        return;
      }

      patternLabel.classList.toggle('hidden');
      settingLabel.classList.toggle('hidden');
      input.classList.toggle('hidden');
      select.classList.toggle('hidden');

      var doc = this.ownerDocument;
      var area = doc.querySelector('div[contentType=' +
          listItem.contentType + '][mode=' + listItem.mode + ']');
      area.enableAddAndEditButtons(!editing);

      if (editing) {
        this.setAttribute('editing', '');
        cr.ui.limitInputWidth(input, this, 20);
        input.focus();
        input.select();
      } else {
        this.removeAttribute('editing');

        var newPattern = input.value;

        var newSetting;
        if (optionAllow.selected)
          newSetting = 'allow';
        else if (optionBlock.selected)
          newSetting = 'block';
        else if (optionSession && optionSession.selected)
          newSetting = 'session';
        else if (optionAsk && optionAsk.selected)
          newSetting = 'ask';

        // Empty edit - do nothing.
        if (pattern == newPattern && newSetting == this.setting)
          return;

        this.pattern = patternLabel.textContent = newPattern;
        this.setting = newSetting;
        settingLabel.textContent = this.settingForDisplay();

        if (pattern != this.pattern) {
          chrome.send('removeExceptions',
                      [this.contentType, this.mode, pattern]);
        }

        chrome.send('setException',
                    [this.contentType, this.mode, this.pattern, this.setting]);
      }
    }
  };

  /**
   * Creates a new exceptions list.
   * @constructor
   * @extends {cr.ui.List}
   */
  var ExceptionsList = cr.ui.define('list');

  ExceptionsList.prototype = {
    __proto__: List.prototype,

    /**
     * Called when an element is decorated as a list.
     */
    decorate: function() {
      List.prototype.decorate.call(this);

      this.dataModel = new ArrayDataModel([]);

      // Whether the exceptions in this list allow an 'Ask every time' option.
      this.enableAskOption = (this.contentType == 'plugins');
    },

    /**
     * Creates an item to go in the list.
     * @param {Object} entry The element from the data model for this row.
     */
    createItem: function(entry) {
      return new ExceptionsListItem(this.contentType,
                                    this.mode,
                                    this.enableAskOption,
                                    entry);
    },

    /**
     * Adds an exception to the js model.
     * @param {Object} entry A dictionary of values for the exception.
     */
    addException: function(entry) {
      this.dataModel.push(entry);

      // When an empty row is added, put it into editing mode.
      if (!entry['displayPattern'] && !entry['setting']) {
        var index = this.dataModel.length - 1;
        var sm = this.selectionModel;
        sm.anchorIndex = sm.leadIndex = sm.selectedIndex = index;
        this.scrollIndexIntoView(index);
        var li = this.getListItemByIndex(index);
        li.editing = true;
      }
    },

    /**
     * The browser has finished checking a pattern for validity. Update the
     * list item to reflect this.
     * @param {string} pattern The pattern.
     * @param {bool} valid Whether said pattern is valid in the context of
     *     a content exception setting.
     */
    patternValidityCheckComplete: function(pattern, valid) {
      for (var i = 0; i < this.dataModel.length; i++) {
        var listItem = this.getListItemByIndex(i);
        if (listItem)
          listItem.maybeSetPatternValid(pattern, valid);
      }
    },

    /**
     * Removes all exceptions from the js model.
     */
    clear: function() {
      this.dataModel = new ArrayDataModel([]);
    },

    /**
     * Removes all selected rows from browser's model.
     */
    removeSelectedRows: function() {
      // The first member is the content type; the rest of the values describe
      // the patterns we are removing.
      var args = [this.contentType];
      var selectedItems = this.selectedItems;
      for (var i = 0; i < selectedItems.length; i++) {
        if (this.contentType == 'location') {
          args.push(selectedItems[i]['origin']);
          args.push(selectedItems[i]['embeddingOrigin']);
        } else if (this.contentType == 'notifications') {
          args.push(selectedItems[i]['origin']);
          args.push(selectedItems[i]['setting']);
        } else {
          args.push(this.mode);
          args.push(selectedItems[i]['displayPattern']);
        }
      }

      chrome.send('removeExceptions', args);
    },

    /**
     * Puts the selected row in editing mode.
     */
    editSelectedRow: function() {
      var li = this.getListItem(this.selectedItem);
      if (li)
        li.editing = true;
    }
  };

  var ExceptionsArea = cr.ui.define('div');

  ExceptionsArea.prototype = {
    __proto__: HTMLDivElement.prototype,

    decorate: function() {
      // TODO(estade): need some sort of visual indication when the list is
      // empty.
      this.exceptionsList = this.querySelector('list');
      this.exceptionsList.contentType = this.contentType;
      this.exceptionsList.mode = this.mode;

      ExceptionsList.decorate(this.exceptionsList);
      this.exceptionsList.selectionModel.addEventListener(
          'change', this.handleOnSelectionChange_.bind(this));

      var self = this;
      if (this.contentType != 'location' &&
          this.contentType != 'notifications') {
        var addRow = cr.doc.createElement('button');
        addRow.textContent = templateData.addExceptionRow;
        this.appendChild(addRow);

        addRow.onclick = function(event) {
          var emptyException = new Object;
          emptyException.displayPattern = '';
          emptyException.setting = '';
          self.exceptionsList.addException(emptyException);
        };
        this.addRow = addRow;

        var editRow = cr.doc.createElement('button');
        editRow.textContent = templateData.editExceptionRow;
        this.appendChild(editRow);
        this.editRow = editRow;

        editRow.onclick = function(event) {
          self.exceptionsList.editSelectedRow();
        };
      }

      var removeRow = cr.doc.createElement('button');
      removeRow.textContent = templateData.removeExceptionRow;
      this.appendChild(removeRow);
      this.removeRow = removeRow;

      removeRow.onclick = function(event) {
        self.exceptionsList.removeSelectedRows();
      };

      this.updateButtonSensitivity();

      this.otrProfileExists = false;
    },

    /**
     * The content type for this exceptions area, such as 'images'.
     * @type {string}
     */
    get contentType() {
      return this.getAttribute('contentType');
    },
    set contentType(type) {
      return this.setAttribute('contentType', type);
    },

    /**
     * The browser mode type for this exceptions area, 'otr' or 'normal'.
     * @type {string}
     */
    get mode() {
      return this.getAttribute('mode');
    },
    set mode(mode) {
      return this.setAttribute('mode', mode);
    },

    /**
     * Update the enabled/disabled state of the editing buttons based on which
     * rows are selected.
     */
    updateButtonSensitivity: function() {
      var selectionSize = this.exceptionsList.selectedItems.length;
      if (this.addRow)
        this.addRow.disabled = this.addAndEditButtonsDisabled;
      if (this.editRow) {
        this.editRow.disabled = selectionSize != 1 ||
            this.addAndEditButtonsDisabled;
      }
      this.removeRow.disabled = selectionSize == 0;
    },

    /**
     * Manually toggle the enabled/disabled state for the add and edit buttons.
     * They'll be disabled while another row is being edited.
     * @param {boolean}
     */
    enableAddAndEditButtons: function(enable) {
      this.addAndEditButtonsDisabled = !enable;
      this.updateButtonSensitivity();
    },

    /**
     * Callback from the selection model.
     * @param {!cr.Event} ce Event with change info.
     * @private
     */
    handleOnSelectionChange_: function(ce) {
      this.updateButtonSensitivity();
   },
  };

  return {
    ExceptionsListItem: ExceptionsListItem,
    ExceptionsList: ExceptionsList,
    ExceptionsArea: ExceptionsArea
  };
});