// Copyright (c) 2012 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', function() {
  /** @const */ var Page = cr.ui.pageManager.Page;
  /** @const */ var PageManager = cr.ui.pageManager.PageManager;
  /** @const */ var ArrayDataModel = cr.ui.ArrayDataModel;

  /**
   * AutofillEditAddressOverlay class
   * Encapsulated handling of the 'Add Page' overlay page.
   * @constructor
   * @extends {cr.ui.pageManager.Page}
   */
  function AutofillEditAddressOverlay() {
    Page.call(this, 'autofillEditAddress',
              loadTimeData.getString('autofillEditAddressTitle'),
              'autofill-edit-address-overlay');
  }

  cr.addSingletonGetter(AutofillEditAddressOverlay);

  AutofillEditAddressOverlay.prototype = {
    __proto__: Page.prototype,

    /**
     * The GUID of the loaded address.
     * @type {string}
     */
    guid_: '',

    /**
     * The BCP 47 language code for the layout of input fields.
     * @type {string}
     */
    languageCode_: '',

    /**
     * The saved field values for the address. For example, if the user changes
     * from United States to Switzerland, then the State field will be hidden
     * and its value will be stored here. If the user changes back to United
     * States, then the State field will be restored to its previous value, as
     * stored in this object.
     * @type {Object}
     */
    savedFieldValues_: {},

    /** @override */
    initializePage: function() {
      Page.prototype.initializePage.call(this);

      var self = this;
      $('autofill-edit-address-cancel-button').onclick = function(event) {
        self.dismissOverlay_();
      };

      // TODO(jhawkins): Investigate other possible solutions.
      $('autofill-edit-address-apply-button').onclick = function(event) {
        // Blur active element to ensure that pending changes are committed.
        if (document.activeElement)
          document.activeElement.blur();
        self.saveAddress_();
        self.dismissOverlay_();
      };

      this.guid_ = '';
      this.populateCountryList_();
      this.rebuildInputFields_(/** @type {Array<Array<Object>>} */(
          loadTimeData.getValue('autofillDefaultCountryComponents')));
      this.languageCode_ =
          loadTimeData.getString('autofillDefaultCountryLanguageCode');
      this.connectInputEvents_();
      this.setInputFields_({});
      this.getCountrySwitcher_().onchange = function(event) {
        self.countryChanged_();
      };
    },

    /**
    * Specifically catch the situations in which the overlay is cancelled
    * externally (e.g. by pressing <Esc>), so that the input fields and
    * GUID can be properly cleared.
    * @override
    */
    handleCancel: function() {
      this.dismissOverlay_();
    },

    /**
     * Clears any uncommitted input, resets the stored GUID and dismisses the
     * overlay.
     * @private
     */
    dismissOverlay_: function() {
      this.setInputFields_({});
      this.inputFieldChanged_();
      this.guid_ = '';
      this.languageCode_ = '';
      this.savedInputFields_ = {};
      PageManager.closeOverlay();
    },

    /**
     * @return {Element} The element used to switch countries.
     * @private
     */
    getCountrySwitcher_: function() {
      return this.pageDiv.querySelector('[field=country]');
    },

    /**
     * Returns all text input elements.
     * @return {!NodeList} The text input elements.
     * @private
     */
    getTextFields_: function() {
      return this.pageDiv.querySelectorAll('textarea[field], input[field]');
    },

    /**
     * Creates a map from type => value for all text fields.
     * @return {Object} The mapping from field names to values.
     * @private
     */
    getInputFields_: function() {
      var address = {country: this.getCountrySwitcher_().value};

      var fields = this.getTextFields_();
      for (var i = 0; i < fields.length; i++) {
        address[fields[i].getAttribute('field')] = fields[i].value;
      }

      return address;
    },

    /**
     * Sets the value of each input field according to |address|.
     * @param {Object} address The object with values to use.
     * @private
     */
    setInputFields_: function(address) {
      this.getCountrySwitcher_().value = address.country || '';

      var fields = this.getTextFields_();
      for (var i = 0; i < fields.length; i++) {
        fields[i].value = address[fields[i].getAttribute('field')] || '';
      }
    },

    /**
     * Aggregates the values in the input fields into an array and sends the
     * array to the Autofill handler.
     * @private
     */
    saveAddress_: function() {
      var inputFields = this.getInputFields_();
      var address = [
        this.guid_,
        inputFields['fullName'] || [],
        inputFields['companyName'] || '',
        inputFields['addrLines'] || '',
        inputFields['dependentLocality'] || '',
        inputFields['city'] || '',
        inputFields['state'] || '',
        inputFields['postalCode'] || '',
        inputFields['sortingCode'] || '',
        inputFields['country'] || loadTimeData.getString('defaultCountryCode'),
        inputFields['phone'] || [],
        inputFields['email'] || [],
        this.languageCode_,
      ];
      chrome.send('setAddress', address);

      // If the GUID is empty, this form is being used to add a new address,
      // rather than edit an existing one.
      if (!this.guid_.length) {
        chrome.send('coreOptionsUserMetricsAction',
                    ['Options_AutofillAddressAdded']);
      }
    },

    /**
     * Connects each input field to the inputFieldChanged_() method that enables
     * or disables the 'Ok' button based on whether all the fields are empty or
     * not.
     * @private
     */
    connectInputEvents_: function() {
      var fields = this.getTextFields_();
      for (var i = 0; i < fields.length; i++) {
        fields[i].oninput = this.inputFieldChanged_.bind(this);
      }
    },

    /**
     * Disables the 'Ok' button if all of the fields are empty.
     * @private
     */
    inputFieldChanged_: function() {
      var disabled = !this.getCountrySwitcher_().value;
      if (disabled) {
        var fields = this.getTextFields_();
        for (var i = 0; i < fields.length; i++) {
          if (fields[i].value) {
            disabled = false;
            break;
          }
        }
      }

      $('autofill-edit-address-apply-button').disabled = disabled;
    },

    /**
     * Updates the address fields appropriately for the selected country.
     * @private
     */
    countryChanged_: function() {
      var countryCode = this.getCountrySwitcher_().value;
      if (countryCode)
        chrome.send('loadAddressEditorComponents', [countryCode]);
      else
        this.inputFieldChanged_();
    },

    /**
     * Populates the country <select> list.
     * @private
     */
    populateCountryList_: function() {
      var countryList = loadTimeData.getValue('autofillCountrySelectList');

      // Add the countries to the country <select>.
      var countrySelect = this.getCountrySwitcher_();
      // Add an empty option.
      countrySelect.appendChild(new Option('', ''));
      for (var i = 0; i < countryList.length; i++) {
        var option = new Option(countryList[i].name,
                                countryList[i].value);
        option.disabled = countryList[i].value == 'separator';
        countrySelect.appendChild(option);
      }
    },

    /**
     * Called to prepare the overlay when a new address is being added.
     * @private
     */
    prepForNewAddress_: function() {
      // Focus the first element.
      this.pageDiv.querySelector('input').focus();
    },

    /**
     * Loads the address data from |address|, sets the input fields based on
     * this data, and stores the GUID and language code of the address.
     * @param {!Object} address Lots of info about an address from the browser.
     * @private
     */
    loadAddress_: function(address) {
      this.rebuildInputFields_(address.components);
      this.setInputFields_(address);
      this.inputFieldChanged_();
      this.connectInputEvents_();
      this.guid_ = address.guid;
      this.languageCode_ = address.languageCode;
    },

    /**
     * Takes a snapshot of the input values, clears the input values, loads the
     * address input layout from |input.components|, restores the input values
     * from snapshot, and stores the |input.languageCode| for the address.
     * @param {{languageCode: string, components: Array<Array<Object>>}} input
     *     Info about how to layout inputs fields in this dialog.
     * @private
     */
    loadAddressComponents_: function(input) {
      var inputFields = this.getInputFields_();
      for (var fieldName in inputFields) {
        if (inputFields.hasOwnProperty(fieldName))
          this.savedFieldValues_[fieldName] = inputFields[fieldName];
      }
      this.rebuildInputFields_(input.components);
      this.setInputFields_(this.savedFieldValues_);
      this.inputFieldChanged_();
      this.connectInputEvents_();
      this.languageCode_ = input.languageCode;
    },

    /**
     * Clears address inputs and rebuilds the input fields according to
     * |components|.
     * @param {Array<Array<Object>>} components A list of information about
     *     each input field.
     * @private
     */
    rebuildInputFields_: function(components) {
      var content = $('autofill-edit-address-fields');
      content.innerHTML = '';

      var customInputElements = {addrLines: 'textarea'};

      for (var i in components) {
        var row = document.createElement('div');
        row.classList.add('input-group', 'settings-row');
        content.appendChild(row);

        for (var j in components[i]) {
          if (components[i][j].field == 'country')
            continue;

          var fieldContainer = document.createElement('label');
          row.appendChild(fieldContainer);

          var fieldName = document.createElement('div');
          fieldName.textContent = components[i][j].name;
          fieldContainer.appendChild(fieldName);

          var input = document.createElement(
              customInputElements[components[i][j].field] || 'input');
          input.setAttribute('field', components[i][j].field);
          input.classList.add(components[i][j].length);
          fieldContainer.appendChild(input);
        }
      }
    },
  };

  AutofillEditAddressOverlay.prepForNewAddress = function() {
    AutofillEditAddressOverlay.getInstance().prepForNewAddress_();
  };

  AutofillEditAddressOverlay.loadAddress = function(address) {
    AutofillEditAddressOverlay.getInstance().loadAddress_(address);
  };

  AutofillEditAddressOverlay.loadAddressComponents = function(input) {
    AutofillEditAddressOverlay.getInstance().loadAddressComponents_(input);
  };

  AutofillEditAddressOverlay.setTitle = function(title) {
    $('autofill-address-title').textContent = title;
  };

  // Export
  return {
    AutofillEditAddressOverlay: AutofillEditAddressOverlay
  };
});