// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * @fileoverview This file contains implementation for UI elements.
 */

/**
 * Namespace for generic UI manipulation.
 */
var ui = {};

/**
 * Opens the dialog identified by the given ID prefix.
 * @param {String} idPrefix  HTML ID prefix of menu item and dialog
 *                           (ie. 'wifi').
 */
ui.openDialog = function(idPrefix) {
  // Close anything else that is already open - though none should be.
  ui.dismissDialog();
  var dialogDoms = $('#' + idPrefix + '-dialog');
  $('#overlay')[0].style.display = '-webkit-box';
  $('#overlay').keydown(function(event) {
    if (event.which == 27)
      ui.dismissDialog();
    if (event.which == 13) {
      // Try to apply.
      $('#apply-button', '#' + idPrefix + '-dialog').click();
    }
  });
  dialogDoms.show();
  $('#cancel-button', dialogDoms).click(ui.onDialogCancelPress);
  $('#apply-header', dialogDoms).html('');
  $('#apply-errors', dialogDoms).html('');
  $('#apply-warnings', dialogDoms).html('');
  main.dialogs[idPrefix].init();
};

/**
 * Return the currently selected option's i18n tag.
 * @param {String} selector  jquery selector for the option.
 * @returns {String}  i18n tag of current selected or '' if none selected.
 */
ui.getSelectedI18n = function(selector) {
  var dom = $(selector)[0];
  var selectedIndex = dom.selectedIndex;
  if (selectedIndex < 0)
    return '';
  return dom.options[selectedIndex].getAttribute('i18n');
};

/**
 * Sets the current option based on i18n tag value.  If no tag exists or
 * none matches, make no changes.
 * @param {String} selector  jquery selector for the option.
 * @param {String} i18n  Value to set
 */
ui.setSelectedI18n = function(selector, i18n) {
  var dom = $(selector)[0];
  var toSelect = -1;
  for (var i = 0; i < dom.options.length; ++i) {
    if (dom.options[i].getAttribute('i18n') == i18n) {
      toSelect = i;
      break;
    }
  }
  if (toSelect >= 0)
    dom.selectedIndex = toSelect;
};

/**
 * Dismiss/hide the active modal dialog.
 */
ui.dismissDialog = function() {
  $('#overlay').hide();
  for (var dialog in main.dialogs)
    $('#' + dialog + '-dialog').hide();
  ui.updateSummary();
};

/**
 * Handle cancel button press on any dialog.
 */
ui.onDialogCancelPress = function() {
  ui.dismissDialog();
};

/**
 * Handle edit button press in the list of networks and certs.
 * @param {String} dialogId  id for dialog to open
 * @param {Integer} index  offset inside arrays of main.oncCurrent
 */
ui.onEditPress = function(dialogId, index) {
  var dialog = main.dialogs[dialogId];
  ui.openDialog(dialogId);
  var result;
  var oncData;
  if (dialogId == 'cert') {
    oncData = main.oncCurrent.Certificates[index];
    result = onc.validateCertificate(index, main.oncCurrent);
  } else {
    oncData = main.oncCurrent.NetworkConfigurations[index];
    result = onc.validateNetwork(index, main.oncCurrent);
  }
  ui.showMessages(result, '#' + dialogId + '-dialog');
  dialog.setToUi(oncData);
  dialog.setUiVisibility();
};

/**
 * Handle remove button press in the list of networks and certs.
 * @param {Object} oncData  ONC blob for the entity to remove.
 */
ui.onRemovePress = function(oncData) {
  // Currently we always trust the user.  If the user wants to remove
  // a certificate that is referenced by a network, allow it.  Upon
  // updating the summary they should see that the network referencing
  // it now has an error.
  // TODO: Use the "Remove" tag when the entity was loaded (vs created
  // this session).

  removeDialog.setOncData(oncData);
  ui.openDialog('remove');
};

/**
 * Reset the given file picker.  The file picker must be its parent's
 * last child.
 * @param {String} domId  Query string to find picker.
 */
ui.resetFilePicker = function(domId) {
  var pickerClone = $(domId).clone();
  var parent = $(domId).parent()[0];
  parent.removeChild($(domId)[0]);
  parent.appendChild(pickerClone[0]);
};

/**
 * Converts the given message list into localized HTML to display.
 * @param {Array.<Array.<String>>} messageList array of messages to
 *   be converted.
 */
ui.convertMessagesToHtml = function(messageList) {
  if (!messageList.length)
    return '';
  messages = [];
  for (var i = 0; i < messageList.length; i++) {
    var messageFormat = messageList[i];
    var message;
    if (messageFormat.length > 1) {
      message = chrome.i18n.getMessage(messageFormat[0],
                                       messageFormat.slice(1));
    } else {
      message = chrome.i18n.getMessage(messageFormat[0]);
    }
    if (!message) {
      message = 'NO TRANSLATION FOR: ' + messageFormat[0];
    }
    messages.push(message);
  }
  return '<p>' + messages.join('</p><p>') + '<\p>';
};

/**
 * Depending on the results, apply the changes or show warnings.
 * @param {Object} result  Result of compiling the UI to ONC.
 * @param {Object} oncTest  ONC resulting from applying change.
 * @param {Object} dialog  DOM node of dialog.
 */
ui.showMessagesAndApply = function(result, oncTest, dialog) {
  ui.showMessages(result, dialog);
  // Require the user to fix errors.
  if (result.errors.length)
    return;
  main.oncCurrent = oncTest;
  ui.dismissDialog();
};

/**
 * Update a certificate dropdown with the currently loaded certificates.
 * Currently only Certificate Authority certs are listed.
 * @param {Object} optionList  DOM option list to update.
 * @param {Boolean} clearFirst  Clear the option list before adding.
 */
ui.updateCertificateDropdown = function(optionList, clearFirst) {
  if (clearFirst) optionList.options.length = 0;
  optionList.disabled = false;
  for (var i = 0; i < main.oncCurrent.Certificates.length; ++i) {
    var oncCert = main.oncCurrent.Certificates[i];
    if (oncCert.Type != 'Authority')
      continue;
    var certDescription = ui.formatCertificate(oncCert, 1);
    optionList.options.add(new Option(certDescription, oncCert.GUID));
  }
  if (optionList.options.length == 0) {
    optionList.options.add(new Option(chrome.i18n.getMessage
                                      ('certificateEmpty'), 'empty'));
    optionList.disabled = true;
  }
};

/**
 * Shows the error or warning mark as appropriate for the given entity.
 * @param {Object} result  Validation result.
 * @param {DOM} entityDom  DOM of entity in the list.
 */
ui.setEntityStatus = function(oncEntity, result, entityDom) {
  var whichMark = null;
  if (result.errors.length)
    whichMark = '#error-mark';
  else if (result.warnings.length)
    whichMark = '#warning-mark';
  if (whichMark) {
    $(whichMark, entityDom).show();
    // if you click on the warning/error, edit the entry.
    $(whichMark, entityDom).click(function(event) {
      $('#edit', this.parentNode).click();
    });
  }
  if (onc.isMarkedForRemoval(oncEntity))
    $('#mark-removal-mark', entityDom).show();
};

/**
 * Format a network configuration for display.
 * @param {Object} oncNetwork  ONC network configuration
 */
ui.formatNetwork = function(oncNetwork, maxLines) {
  var bestName = chrome.i18n.getMessage('unknownName');
  if ('Name' in oncNetwork)
    bestName = oncNetwork.Name;
  else if ('GUID' in oncNetwork)
    bestName = oncNetwork.GUID;
  if (maxLines == 1) {
    return bestName;
  } else {
    var bestType = chrome.i18n.getMessage('unknownType');
    if ('Type' in oncNetwork)
      bestType = oncNetwork.Type;
    return bestName + '<br>' + bestType;
  }
};

/**
 * Handle edit press on a network in the summary list.
 */
ui.onNetworkEditPress = function() {
  var parent = $(this).parent();
  var index = parent.data('index')
  if (parent.data('onc').Type == 'WiFi')
    ui.onEditPress('wifi', index);
  else
    ui.onEditPress('vpn', index);
};

/**
 * Format a network configuration for display.
 * @param {Object} oncNetwork  ONC network configuration
 * @param {Integer} maxLines Maximum lines available for description.
                    Defaults to no maximum.
 */
ui.formatCertificate = function(oncCert, maxLines) {
  var cert = null;
  var bestName = [ chrome.i18n.getMessage('unknownName'), '' ];
  if ('GUID' in oncCert) {
    bestName[0] = oncCert['GUID'];
  }
  if ('X509' in oncCert) {
    cert = main.interpretCertFromX509Pem(oncCert.X509);
  }
  if (cert && 'commonName' in cert.subject) {
    bestName[0] = cert.subject.commonName;
  }
  if (cert && 'commonName' in cert.issuer) {
    bestName[1] = cert.subject.commonName;
  }

  if (maxLines == 1)
    return bestName[0];
  return bestName[0] + '<br>\n [' + bestName[1] + ']';
};

/**
 * Handle edit press on a network in the summary list.
 */
ui.onCertificateEditPress = function() {
  var parent = $(this).parent();
  var index = parent.data('index')
  ui.onEditPress('cert', index);
};

/**
 * Show the summary of the current ONC settings for a given kind of entity.
 * @param {Array.<Object>} list  List of entities (networks or certificates)
 * @param {String} id  query id of the list's top level DOM.
 * @param {Function} validator  Called to validate this entity.
 * @param {Function} formatter  Called to format entity to HTML.
 * @param {Function} editCallback  Called to handle edit press of this entity.
 */
ui.showSummaryList = function(list, id, validator, formatter, editCallback) {
  for (var i = 0; i < list.length; ++i) {
    var oncEntity = list[i];
    var result = validator(i, main.oncCurrent);
    var newDom = $('#template', id).clone();
    newDom[0].id = '';
    $(id).append(newDom);
    $('#left', newDom).html(formatter(oncEntity));
    ui.setEntityStatus(oncEntity, result, newDom);

    var editButton = $('#edit', newDom);
    editButton.parent().data('onc', oncEntity);
    editButton.parent().data('index', i);
    editButton.click(editCallback);
    // For opaque entities which we do not know how to edit or
    // entities marked for removal already, simply remove the edit
    // button.  User can still preserve such entities and remove them,
    // but not modify them.
    if (result.hasOpaqueEntity || onc.isMarkedForRemoval(oncEntity)) {
      editButton[0].parentNode.removeChild(editButton[0]);
    }
    var removeButton = $('#remove', newDom);
    removeButton.click(function() {
      ui.onRemovePress($(this).parent().data('onc'));
    });
    newDom.hover(
      function() {
        $('.action', this).show();
      },
      function() {
        $('.action', this).hide();
      });
    newDom[0].style.display = '-webkit-box';
  }
};

/**
 * Update the summary (right) pane.
 */
ui.updateSummary = function() {
  var rightPane = $('#right-pane')[0];

  // Remove all entities other than the template.
  var entities = $('.entity');
  for (var i = 0; i < entities.length; ++i) {
    if (entities[i].style.display != '')
      entities[i].parentNode.removeChild(entities[i]);
  }

  ui.showSummaryList(main.oncCurrent.NetworkConfigurations,
                     '#network-configurations',
                     onc.validateNetwork,
                     ui.formatNetwork,
                     ui.onNetworkEditPress);

  ui.showSummaryList(main.oncCurrent.Certificates,
                     '#certificates',
                     onc.validateCertificate,
                     ui.formatCertificate,
                     ui.onCertificateEditPress);
};

/**
 * Show the results in the dialog.
 * @param {Object} result  Result of compiling the UI to ONC.
 * @param {Object} dialog  DOM node of dialog.
 */
ui.showMessages = function(result, dialog) {
  $('#apply-errors', dialog).html(ui.convertMessagesToHtml
                                  (result.errors));
  $('#apply-warnings', dialog).html(ui.convertMessagesToHtml
                                    (result.warnings));
};

/**
 * Handles loading the body of the extension.  Called from onload
 * event handler.
 */
ui.translateText = function() {
  var i18nNodes = document.querySelectorAll('[i18n]');
  for (var i = 0; i < i18nNodes.length; ++i) {
    var i18nId = i18nNodes[i].getAttribute('i18n');
    var translation = chrome.i18n.getMessage(i18nId);
    if (translation == '') {
      translation = 'NO TRANSLATION FOR: ' + i18nId;
    }
    i18nNodes[i].textContent = translation;
  }
};