/**
 * Silex, live web creation
 * http://projects.silexlabs.org/?/silex/
 *
 * Copyright (c) 2012 Silex Labs
 * http://www.silexlabs.org/
 *
 * Silex is available under the GPL license
 * http://www.silexlabs.org/silex/silex-licensing/
 */

/**
 * @fileoverview
 *   This class handle a div positioned on top of the selected text in a text
 * box It uses the wysihtml library to change text format
 */

import { wysihtml, WysiHtmlEditor } from '../externs';
import { Body } from '../model/body';
import { Tracker } from '../service/tracker';
import { Controller, LinkData, Model } from '../types';
import { SilexNotification } from '../utils/notification';
import { FileExplorer } from '../view/dialog/file-explorer';
import { LINK_ATTRIBUTES, LinkDialog } from './dialog/LinkDialog';

/**
 * @class {silex.view.TextFormatBar}
 */
export class TextFormatBar {
  // tracker for analytics
  tracker: any;

  // store the params
  selectedElements: HTMLElement[] = null;
  pageNames: string[] = null;
  currentPageName: string = null;
  currentTextBox: HTMLElement = null;
  wysihtmlEditor: WysiHtmlEditor = null;
  linkDialog: any;
  toolbar: any;

  // for event add / remove
  onKeyDownBinded: any;
  onScrollBinded: any;

  /**
   *
   * @param element   container to render the UI
   * @param model  model class which holds
   * the model instances - views use it for
   * read operation only
   * @param controller  structure which holds
   * the controller instances
   */
  constructor(protected element: HTMLElement, protected model: Model, protected controller: Controller) {
    this.tracker = Tracker.getInstance();
    this.linkDialog = new LinkDialog(this.model);
    this.toolbar = this.element.querySelector('#wysihtml5-toolbar');
    this.onKeyDownBinded = this.onKeyDown.bind(this);
    this.onScrollBinded = this.onScroll.bind(this);
  }

  /**
   * get the link of selected text in text editor
   * this uses a hidden text field in the text format bar, which has a value set
   * by wysihtml
   */
  getLink(): LinkData {
    return LINK_ATTRIBUTES.reduce((acc, attr) => {
      const el = this.element.querySelector('.get-' + attr) as HTMLInputElement;
      if (!el) {
        console.error(
            'could not get data from link editor for attribute', attr);
      } else {
        acc[attr] = el.value;
      }
      return acc;
    }, {});
  }

  /**
   * Intercept keys before it is forwarded from iframe to Silex
   */
  onKeyDown(e) {
    if (e.key === 'Escape') {
      // stop editing but keep selection
      this.stopEditing();
      e.preventDefault();
      e.stopPropagation();
    }
  }

  onScroll(e) {
    this.controller.textEditorController.attachToTextBox(this.currentTextBox, this.element);
  }

  /**
   * stop edit, destroy wysihtml object and reset everything
   */
  stopEditing() {
    this.controller.stageController.stopEdit();

    if (this.wysihtmlEditor) {
      // remove event listener
      const doc = this.model.file.getContentDocument();
      const win = this.model.file.getContentWindow();
      doc.removeEventListener('keydown', this.onKeyDownBinded);
      win.removeEventListener('scroll', this.onScrollBinded);

      // remove and put back the whole UI
      // this is the way to go with wysihtml
      // @see https://github.com/Voog/wysihtml/issues/109#issuecomment-198350743
      (this.element.querySelector('.image-details') as HTMLElement).style.display = 'none';
      this.wysihtmlEditor.destroy();
      this.wysihtmlEditor = null;
      const parent = this.toolbar.parentElement;
      const clone = this.toolbar.cloneNode(true);
      Array.from(clone.querySelectorAll('.wysihtml-command-active'))
          .forEach((el: HTMLElement) => el.classList.remove('wysihtml-command-active'));
      parent.insertBefore(clone, this.toolbar);
      parent.removeChild(this.toolbar);
      this.toolbar = clone;

      // reset focus
      Body.resetFocus();
      this.controller.stageController.refreshView();

      // use array acces for getSelection as a workaround for google closure
      // warning 'Property getSelection never defined on Document' cleanup
      const editable = this.model.element.getContentNode(this.currentTextBox);
      editable.removeAttribute('contenteditable');
      editable.classList.remove('wysihtml-sandbox', 'wysihtml-editor');
      this.currentTextBox.classList.remove('text-editor-focus');
      this.currentTextBox.removeAttribute('data-allow-silex-shortcuts');
      this.currentTextBox.onclick = null;
      this.currentTextBox = null;
    }
    this.element.classList.remove('text-editor-editing');
  }

  startEditing(fileExplorer: FileExplorer) {
    // edit the style of the selection
    if (this.selectedElements.length === 1) {
      const newTextBox = this.selectedElements[0];
      if (newTextBox !== this.currentTextBox) {
        this.stopEditing();
        this.controller.stageController.startEdit();

        this.currentTextBox = newTextBox;

        // this.currentTextBox.insertBefore(this.element,
        // this.currentTextBox.firstChild);
        this.controller.textEditorController.attachToTextBox(this.currentTextBox, this.element);
        const editable = this.model.element.getContentNode(this.currentTextBox);
        const options = {
          toolbar: this.toolbar,
          handleTables: false,
          useLineBreaks: false,
          classes: {
            'wysiwyg-float-left': 1,
            // this doesnt work for some reason
            'wysiwyg-float-right': 1,
          },
          // this doesnt work for some reason
          parserRules: {
            tags: {
              b: {},
              strong: {rename_tag: 'b'},
              i: {},
              br: {},
              p: {},
              h1: {},
              h2: {},
              h3: {},
              h4: {},
              h5: {},
              h6: {},
              ul: {},
              u: {},
              ol: {},
              li: {},
              a: {
                check_attributes: {
                  href: 'href',
                  download: 'href',
                  target: 'any',
                  title: 'any',
                  type: 'any',
                },
              },
              img: {
                check_attributes: {
                  src: 'src',
                  alt: 'alt',
                  title: 'any',
                  width: 'any',
                  height: 'any',
                  class: 'any',
                },
              },
              // this should not be necessary, workaround
              font: {rename_tag: 'span', add_class: {size: 'size_font'}},
            },
          },
        };
        this.wysihtmlEditor = new wysihtml.Editor(editable, options);

        // CSS classes
        this.currentTextBox.classList.add('text-editor-focus');
        this.currentTextBox.setAttribute('data-allow-silex-shortcuts', 'true');
        this.element.classList.add('text-editor-editing');

        // handle the focus
        const doc = this.model.file.getContentDocument();
        const win = this.model.file.getContentWindow();
        doc.addEventListener('keydown', this.onKeyDownBinded);
        win.addEventListener('scroll', this.onScrollBinded);
        this.wysihtmlEditor.on('blur', (e) => {
          if (!SilexNotification.isActive) {
            this.stopEditing();
          }
        });
        this.wysihtmlEditor.on('load', () => {
          this.wysihtmlEditor.focus(false);
          setTimeout(() => {
            if (this.wysihtmlEditor) {
              this.wysihtmlEditor.focus(false);
            }
          }, 250);
          setTimeout(() => {
            if (this.wysihtmlEditor) {
              this.wysihtmlEditor.focus(false);
            }
          }, 500);
          (this.element.querySelector('.insert-image') as HTMLElement).onclick = (e) => {
            this.tracker.trackAction('controller-events', 'request', 'insert.image.text', 0);
            fileExplorer.openFile(FileExplorer.IMAGE_EXTENSIONS)
                .then((fileInfo) => {
                  if (fileInfo) {
                    // undo checkpoint
                    this.controller.textEditorController.undoCheckPoint();
                    this.wysihtmlEditor.composer.commands.exec('insertImage', {src: fileInfo.absPath, alt: ''});
                    this.tracker.trackAction('controller-events', 'success', 'insert.image.text', 1);
                  }
                })
                .catch((error) => {
                  SilexNotification.notifyError('Error: I did not manage to load the image. \n' + (error.message || ''));
                  this.tracker.trackAction('controller-events', 'error', 'insert.image.text', -1);
                });
          };

          // image details UI
          const imageDetails = this.element.querySelector('.image-details') as HTMLElement;
          const autoBtn = imageDetails.querySelector('#auto-submit-image') as HTMLElement;

          function autoSubmitImage(e) {
            // give time to the value to be updated and validate wysihtml image
            // dialog
            setTimeout(() => {
              autoBtn.click();
              imageDetails.style.display = '';
              (e.target as HTMLElement).focus();
            }, 100);
          }
          (imageDetails.querySelector('.float') as HTMLElement).onchange = (e) => autoSubmitImage(e);
          (imageDetails.querySelector('.src') as HTMLElement).onkeydown = (e) => autoSubmitImage(e);
          (imageDetails.querySelector('.alt') as HTMLElement).onkeydown = (e) => autoSubmitImage(e);
          (this.element.querySelector('.create-link') as HTMLElement).onclick = (e) => {
            // open link editor
            this.linkDialog.open(this.getLink(), this.pageNames, (_options) => {
              if (_options) {
                this.wysihtmlEditor.composer.commands.exec('createLink', _options);
              } else {
                this.wysihtmlEditor.composer.commands.exec('removeLink');
              }
            });

            // prevent click on the button
            e.preventDefault();
          };
        });
      }
    } else {
      console.error('Error, can not edit selection with format pane', this.selectedElements);
    }
  }

  /**
   * redraw the properties
   * @param selectedElements the elements currently selected
   * @param pageNames   the names of the pages which appear in the current HTML file
   * @param  currentPageName   the name of the current page
   */
  redraw(selectedElements: HTMLElement[], pageNames: string[], currentPageName: string) {
    // reuse selectedElements in combo box on change
    this.selectedElements = selectedElements;

    // reuse pageNames in combo box on change
    this.pageNames = pageNames;
    this.currentPageName = currentPageName;
  }
}