import _Promise from 'babel-runtime/core-js/promise';
import _setImmediate from 'babel-runtime/core-js/set-immediate';
import _Object$getPrototypeOf from 'babel-runtime/core-js/object/get-prototype-of';
import _classCallCheck from 'babel-runtime/helpers/classCallCheck';
import _createClass from 'babel-runtime/helpers/createClass';
import _possibleConstructorReturn from 'babel-runtime/helpers/possibleConstructorReturn';
import _inherits from 'babel-runtime/helpers/inherits';
/*
Copyright 2013-2015 ASIAL CORPORATION

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

*/

import onsElements from '../ons/elements';
import util from '../ons/util';
import autoStyle from '../ons/autostyle';
import ModifierUtil from '../ons/internal/modifier-util';
import BaseElement from './base/base-element';
import TabbarElement from './ons-tabbar';
import contentReady from '../ons/content-ready';
import { PageLoader, defaultPageLoader } from '../ons/page-loader';

var defaultClassName = 'tabbar__item';

var scheme = {
  '': 'tabbar--*__item',
  '.tabbar__button': 'tabbar--*__button'
};

/**
 * @element ons-tab
 * @category tabbar
 * @description
 *   [en]Represents a tab inside tab bar. Each `<ons-tab>` represents a page.[/en]
 *   [ja]
 *     タブバーに配置される各アイテムのコンポーネントです。それぞれのons-tabはページを表します。
 *     ons-tab要素の中には、タブに表示されるコンテンツを直接記述することが出来ます。
 *   [/ja]
 * @codepen pGuDL
 * @tutorial vanilla/Reference/tabbar
 * @guide fundamentals.html#managing-pages
 *   [en]Managing multiple pages.[/en]
 *   [ja]複数のページを管理する[/ja]]
 * @guide appsize.html#removing-icon-packs [en]Removing icon packs.[/en][ja][/ja]
 * @guide faq.html#how-can-i-use-custom-icon-packs [en]Adding custom icon packs.[/en][ja][/ja]
 * @seealso ons-tabbar
 *   [en]ons-tabbar component[/en]
 *   [ja]ons-tabbarコンポーネント[/ja]
 * @seealso ons-page
 *   [en]ons-page component[/en]
 *   [ja]ons-pageコンポーネント[/ja]
 * @seealso ons-icon
 *   [en]ons-icon component[/en]
 *   [ja]ons-iconコンポーネント[/ja]
 * @example
 * <ons-tabbar>
 *   <ons-tab
 *     page="home.html"
 *     label="Home"
 *     active>
 *   </ons-tab>
 *   <ons-tab
 *     page="settings.html"
 *     label="Settings"
 *     active>
 *   </ons-tab>
 * </ons-tabbar>
 *
 * <template id="home.html">
 *   ...
 * </template>
 *
 * <template id="settings.html">
 *   ...
 * </template>

 */

var TabElement = function (_BaseElement) {
  _inherits(TabElement, _BaseElement);

  /**
   * @attribute page
   * @initonly
   * @type {String}
   * @description
   *   [en]The page that is displayed when the tab is tapped.[/en]
   *   [ja]ons-tabが参照するページへのURLを指定します。[/ja]
   */

  /**
   * @attribute icon
   * @type {String}
   * @description
   *   [en]
   *     The icon name for the tab. Can specify the same icon name as `<ons-icon>`. Check [See also](#seealso) section for more information.
   *   [/en]
   *   [ja]
   *     アイコン名を指定します。ons-iconと同じアイコン名を指定できます。
   *     個別にアイコンをカスタマイズする場合は、background-imageなどのCSSスタイルを用いて指定できます。
   *   [/ja]
   */

  /**
   * @attribute active-icon
   * @type {String}
   * @description
   *   [en]The name of the icon when the tab is active.[/en]
   *   [ja]アクティブの際のアイコン名を指定します。[/ja]
   */

  /**
   * @attribute label
   * @type {String}
   * @description
   *   [en]The label of the tab item.[/en]
   *   [ja]アイコン下に表示されるラベルを指定します。[/ja]
   */

  /**
   * @attribute badge
   * @type {String}
   * @description
   *   [en]Display a notification badge on top of the tab.[/en]
   *   [ja]バッジに表示する内容を指定します。[/ja]
   */

  /**
   * @attribute active
   * @description
   *   [en]This attribute should be set to the tab that is active by default.[/en]
   *   [ja][/ja]
   */

  function TabElement() {
    _classCallCheck(this, TabElement);

    var _this = _possibleConstructorReturn(this, (TabElement.__proto__ || _Object$getPrototypeOf(TabElement)).call(this));

    if (['label', 'icon', 'badge'].some(_this.hasAttribute.bind(_this))) {
      _this._compile();
    } else {
      contentReady(_this, function () {
        return _this._compile();
      });
    }

    _this._pageLoader = defaultPageLoader;
    _this._onClick = _this._onClick.bind(_this);
    return _this;
  }

  _createClass(TabElement, [{
    key: '_compile',
    value: function _compile() {
      autoStyle.prepare(this);
      this.classList.add(defaultClassName);

      if (this._button) {
        return;
      }

      var button = util.create('button.tabbar__button');
      while (this.childNodes[0]) {
        button.appendChild(this.childNodes[0]);
      }

      var input = util.create('input', { display: 'none' });
      input.type = 'radio';

      this.appendChild(input);
      this.appendChild(button);

      this._updateButtonContent();
      ModifierUtil.initModifier(this, scheme);
      this._updateRipple();
    }
  }, {
    key: '_updateRipple',
    value: function _updateRipple() {
      this._button && util.updateRipple(this._button, this.hasAttribute('ripple'));
    }
  }, {
    key: '_updateButtonContent',
    value: function _updateButtonContent() {
      var _this2 = this;

      var button = this._button;

      var iconWrapper = this._icon;
      if (this.hasAttribute('icon')) {
        iconWrapper = iconWrapper || util.createElement('<div class="tabbar__icon"><ons-icon></ons-icon></div>');
        var icon = iconWrapper.children[0];
        var fix = function (last) {
          return function () {
            return icon.attributeChangedCallback('icon', last, _this2.getAttribute('icon'));
          };
        }(icon.getAttribute('icon'));
        icon.setAttribute('icon', this.getAttribute(this.isActive() ? 'active-icon' : 'icon'));
        iconWrapper.parentElement !== button && button.insertBefore(iconWrapper, button.firstChild);

        // dirty fix for https://github.com/OnsenUI/OnsenUI/issues/1654
        icon.attributeChangedCallback instanceof Function ? fix() : _setImmediate(function () {
          return icon.attributeChangedCallback instanceof Function && fix();
        });
      } else {
        iconWrapper && iconWrapper.remove();
      }

      ['label', 'badge'].forEach(function (attr, index) {
        var prop = _this2.querySelector('.tabbar__' + attr);
        if (_this2.hasAttribute(attr)) {
          prop = prop || util.create('.tabbar__' + attr + (attr === 'badge' ? ' notification' : ''));
          prop.textContent = _this2.getAttribute(attr);
          prop.parentElement !== button && button.appendChild(prop);
        } else {
          prop && prop.remove();
        }
      });
    }
  }, {
    key: '_onClick',
    value: function _onClick() {
      if (this.onClick instanceof Function) {
        this.onClick();
      } else {
        this._tabbar.setActiveTab(this.index, { reject: false });
      }
    }
  }, {
    key: 'setActive',
    value: function setActive() {
      var active = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : true;

      this._input.checked = active;
      this.classList.toggle('active', active);
      util.toggleAttribute(this, 'active', active);

      if (this.hasAttribute('icon') && this.hasAttribute('active-icon')) {
        this._icon.children[0].setAttribute('icon', this.getAttribute(active ? 'active-icon' : 'icon'));
      }
    }
  }, {
    key: '_loadPageElement',
    value: function _loadPageElement(parent, page) {
      var _this3 = this;

      this._hasLoaded = true;

      return new _Promise(function (resolve) {
        _this3._pageLoader.load({ parent: parent, page: page }, function (pageElement) {
          parent.replaceChild(pageElement, parent.children[_this3.index]); // Ensure position
          _this3._loadedPage = pageElement;
          resolve(pageElement);
        });
      });
    }
  }, {
    key: 'isActive',


    /**
     * @return {Boolean}
     */
    value: function isActive() {
      return this.classList.contains('active');
    }
  }, {
    key: 'disconnectedCallback',
    value: function disconnectedCallback() {
      this.removeEventListener('click', this._onClick, false);
      if (this._loadedPage) {
        this._hasLoaded = false;
        this.loaded = null;
      }
    }
  }, {
    key: 'connectedCallback',
    value: function connectedCallback() {
      var _this4 = this;

      this.addEventListener('click', this._onClick, false);

      if (!util.isAttached(this) || this.loaded) {
        return; // ons-tabbar compilation may trigger this
      }

      var deferred = util.defer();
      this.loaded = deferred.promise;

      contentReady(this, function () {
        var index = _this4.index;
        var tabbar = _this4._tabbar;
        if (!tabbar) {
          util.throw('Tab elements must be children of Tabbar');
        }

        if (tabbar.hasAttribute('modifier')) {
          util.addModifier(_this4, tabbar.getAttribute('modifier'));
        }

        if (!_this4._hasLoaded) {
          if (_this4.hasAttribute('active')) {
            _this4.setActive(true);
            tabbar.setAttribute('activeIndex', index);
          }

          if (index === tabbar.tabs.length - 1) {
            tabbar._onRefresh();
            _setImmediate(function () {
              return tabbar._onRefresh();
            });
          }

          TabbarElement.rewritables.ready(tabbar, function () {
            var pageTarget = _this4.page || _this4.getAttribute('page');
            if (!_this4.pageElement && pageTarget) {
              var parentTarget = tabbar._targetElement;
              var dummyPage = util.create('div', { height: '100%', width: '100%', visibility: 'hidden' });
              parentTarget.insertBefore(dummyPage, parentTarget.children[index]); // Ensure position

              var load = function load() {
                return _this4._loadPageElement(parentTarget, pageTarget).then(deferred.resolve);
              };
              return _this4.isActive() ? load() : tabbar._loadInactive.promise.then(load);
            }

            return deferred.resolve(_this4.pageElement);
          });
        }
      });
    }
  }, {
    key: 'attributeChangedCallback',
    value: function attributeChangedCallback(name, last, current) {
      var _this5 = this;

      switch (name) {
        case 'class':
          util.restoreClass(this, defaultClassName, scheme);
          break;
        case 'modifier':
          contentReady(this, function () {
            return ModifierUtil.onModifierChanged(last, current, _this5, scheme);
          });
          break;
        case 'ripple':
          contentReady(this, function () {
            return _this5._updateRipple();
          });
          break;
        case 'icon':
        case 'label':
        case 'badge':
          contentReady(this, function () {
            return _this5._updateButtonContent();
          });
          break;
        case 'page':
          this.page = current || '';
          break;
      }
    }
  }, {
    key: 'pageLoader',
    set: function set(loader) {
      if (!(loader instanceof PageLoader)) {
        util.throwPageLoader();
      }
      this._pageLoader = loader;
    },
    get: function get() {
      return this._pageLoader;
    }
  }, {
    key: '_input',
    get: function get() {
      return util.findChild(this, 'input');
    }
  }, {
    key: '_button',
    get: function get() {
      return util.findChild(this, '.tabbar__button');
    }
  }, {
    key: '_icon',
    get: function get() {
      return this.querySelector('.tabbar__icon');
    }
  }, {
    key: '_tabbar',
    get: function get() {
      return util.findParent(this, 'ons-tabbar');
    }
  }, {
    key: 'index',
    get: function get() {
      return Array.prototype.indexOf.call(this.parentElement.children, this);
    }
  }, {
    key: 'pageElement',
    get: function get() {
      // It has been loaded by ons-tab
      if (this._loadedPage) {
        return this._loadedPage;
      }
      // Manually attached to DOM, 1 per tab
      var tabbar = this._tabbar;
      if (tabbar.pages.length === tabbar.tabs.length) {
        return tabbar.pages[this.index];
      }
      // Loaded in another way
      return null;
    }
  }], [{
    key: 'observedAttributes',
    get: function get() {
      return ['modifier', 'ripple', 'icon', 'label', 'page', 'badge', 'class'];
    }
  }]);

  return TabElement;
}(BaseElement);

export default TabElement;


onsElements.Tab = TabElement;
customElements.define('ons-tab', TabElement);