import { bindAll } from 'underscore';
import { Model } from '../../common';
import { hasWin } from '../../utils/mixins';

let CodeMirror: any;

if (hasWin()) {
  CodeMirror = require('codemirror/lib/codemirror');
  require('codemirror/mode/htmlmixed/htmlmixed');
  require('codemirror/mode/css/css');
  require('codemirror-formatting');
}

export default class CodeMirrorEditor extends Model {
  editor?: any;
  element?: HTMLElement;

  defaults() {
    return {
      input: '',
      label: '',
      codeName: '',
      theme: 'hopscotch',
      readOnly: true,
      lineNumbers: true,
      autoFormat: true,
    };
  }

  init(el: HTMLElement) {
    bindAll(this, 'onChange');
    this.editor = CodeMirror.fromTextArea(el, {
      dragDrop: false,
      lineWrapping: true,
      mode: this.get('codeName'),
      ...this.attributes,
    });
    this.element = el;
    this.editor.on('change', this.onChange);

    return this;
  }

  onChange() {
    this.trigger('update', this);
  }

  getEditor() {
    return this.editor;
  }

  /**
   * The element where the viewer is attached
   * @return {HTMLElement}
   */
  getElement() {
    return this.element;
  }

  /**
   * Set the element which contains the viewer attached.
   * Generally, it should be just a textarea, but some editor might require
   * a container for it some in that case this method can be used
   * @param {HTMLElement} el
   * @return {self}
   */
  setElement(el: HTMLElement) {
    this.element = el;
    return this;
  }

  /**
   * Refresh the viewer
   * @return {self}
   */
  refresh() {
    this.getEditor().refresh();
    return this;
  }

  /**
   * Focus the viewer
   * @return {self}
   */
  focus() {
    this.getEditor().focus();
    return this;
  }

  getContent() {
    const ed = this.getEditor();
    return ed && ed.getValue();
  }

  /** @inheritdoc */
  setContent(value: string, opts: any = {}) {
    const { editor } = this;
    if (!editor) return;
    editor.setValue(value);
    const autoFormat = this.get('autoFormat');
    const canAutoFormat =
      editor.autoFormatRange &&
      (autoFormat === true || (Array.isArray(autoFormat) && autoFormat.includes(this.get('codeName'))));

    if (canAutoFormat) {
      CodeMirror.commands.selectAll(editor);
      editor.autoFormatRange(editor.getCursor(true), editor.getCursor(false));
      CodeMirror.commands.goDocStart(editor);
    }

    !opts.noRefresh && setTimeout(() => this.refresh());
  }
}

// @ts-ignore
CodeMirrorEditor.prototype.CodeMirror = CodeMirror;