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/* Copyright (c) 2011 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.
 */

var l10n = l10n || {};

/**
 * Localize an element by setting its innerText according to the specified tag
 * and an optional set of substitutions.
 * @param {Element} element The element to localize.
 * @param {string} tag The localization tag.
 * @param {(string|Array)=} opt_substitutions An optional set of substitution
 *     strings corresponding to the "placeholders" attributes in messages.json.
 * @return {boolean} True if the localization was successful; false otherwise.
 */
l10n.localizeElementFromTag = function(element, tag, opt_substitutions) {
  var translation = chrome.i18n.getMessage(tag, opt_substitutions);
  if (translation) {
    element.innerHTML = translation;
  } else {
    console.error('Missing translation for "' + tag + '":', element);
  }
  return translation != null;
};

/**
 * Localize an element by setting its innerText according to its i18n-content
 * attribute, and an optional set of substitutions.
 * @param {Element} element The element to localize.
 * @param {(string|Array)=} opt_substitutions An optional set of substitution
 *     strings corresponding to the "placeholders" attributes in messages.json.
 * @return {boolean} True if the localization was successful; false otherwise.
 */
l10n.localizeElement = function(element, opt_substitutions) {
  var tag = element.getAttribute('i18n-content');
  return l10n.localizeElementFromTag(element, tag, opt_substitutions);
};

/**
 * Localize all tags with the i18n-content attribute, using i18n-data-n
 * attributes to specify any placeholder substitutions.
 */
l10n.localize = function() {
  var elements = document.querySelectorAll('[i18n-content]');
  for (var i = 0; i < elements.length; ++i) {
    /** @type {Element} */ var element = elements[i];
    var substitutions = null;
    for (var j = 1; j < 9; ++j) {
      var attr = 'i18n-value-' + j;
      if (element.hasAttribute(attr)) {
        if (!substitutions) {
          substitutions = [];
        }
        substitutions.push(element.getAttribute(attr));
      } else {
        break;
      }
    }
    l10n.localizeElement(element, substitutions);
  }
};