/**
 * Copyright 2019 Adobe. All rights reserved.
 * This file is licensed to you 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 REPRESENTATIONS
 * OF ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

import {BaseComponent} from '../../../coral-base-component';
import {Overlay} from '../../../coral-component-overlay';

const CLASSNAME = '_coral-Shell-header';

/**
 @class Coral.Shell.Header
 @classdesc A Shell Header component
 @htmltag coral-shell-header
 @extends {HTMLElement}
 @extends {BaseComponent}
 */
class ShellHeader extends BaseComponent(HTMLElement) {
  /** @ignore */
  constructor() {
    super();

    // Prepare templates
    this._elements = {
      // Fetch or create the content zone elements
      home: this.querySelector('coral-shell-header-home') || document.createElement('coral-shell-header-home'),
      actions: this.querySelector('coral-shell-header-actions') || document.createElement('coral-shell-header-actions'),
      content: this.querySelector('coral-shell-header-content') || document.createElement('coral-shell-header-content')
    };

    Overlay._OverlayManager.push(this);
  }

  /**
   The label of the panel.

   @type {HTMLElement}
   @contentzone
   */
  get home() {
    return this._getContentZone(this._elements.home);
  }

  set home(value) {
    this._setContentZone('home', value, {
      handle: 'home',
      tagName: 'coral-shell-header-home',
      insert: function (content) {
        this.appendChild(content);
      }
    });
  }

  /**
   The main content zone of the panel.

   @type {HTMLElement}
   @contentzone
   */
  get content() {
    return this._getContentZone(this._elements.content);
  }

  set content(value) {
    this._setContentZone('content', value, {
      handle: 'content',
      tagName: 'coral-shell-header-content',
      insert: function (content) {
        this.appendChild(content);
      }
    });
  }

  /**
   The content zone where the actions are placed.

   @type {HTMLElement}
   @contentzone
   */
  get actions() {
    return this._getContentZone(this._elements.actions);
  }

  set actions(value) {
    this._setContentZone('actions', value, {
      handle: 'actions',
      tagName: 'coral-shell-header-actions',
      insert: function (content) {
        this.appendChild(content);
      }
    });
  }

  get _contentZones() {
    return {
      'coral-shell-header-home': 'home',
      'coral-shell-header-content': 'content',
      'coral-shell-header-actions': 'actions'
    };
  }

  /** @ignore */
  render() {
    super.render();

    this.classList.add(CLASSNAME);
    // appheader only exists on darkest theme
    this.classList.add('coral--darkest', 'u-coral-clearFix');

    const home = this._elements.home;
    const actions = this._elements.actions;
    const content = this._elements.content;

    // Remove them so we can process children
    if (home.parentNode) {
      home.remove();
    }
    if (actions.parentNode) {
      actions.remove();
    }
    if (content.parentNode) {
      content.remove();
    }

    // moves everything to the main content zone
    while (this.firstChild) {
      content.appendChild(this.firstChild);
    }

    // // Call the content zone insert
    this.home = home;
    this.actions = actions;
    this.content = content;
  }
}

export default ShellHeader;
