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import $ from 'jquery';
import {initMarkupContent} from '../markup/content.js';
import {attachEasyMDEToElements, importEasyMDE, validateTextareaNonEmpty} from './comp/EasyMDE.js';
import {initCompMarkupContentPreviewTab} from './comp/MarkupContentPreview.js';

const {csrfToken} = window.config;

async function initRepoWikiFormEditor() {
  const $editArea = $('.repository.wiki textarea#edit_area');
  if (!$editArea.length) return;

  let sideBySideChanges = 0;
  let sideBySideTimeout = null;
  let hasEasyMDE = true;

  const $form = $('.repository.wiki.new .ui.form');
  const EasyMDE = await importEasyMDE();
  const easyMDE = new EasyMDE({
    autoDownloadFontAwesome: false,
    element: $editArea[0],
    forceSync: true,
    previewRender(plainText, preview) { // Async method
      // FIXME: still send render request when return back to edit mode
      const render = function () {
        sideBySideChanges = 0;
        if (sideBySideTimeout !== null) {
          clearTimeout(sideBySideTimeout);
          sideBySideTimeout = null;
        }
        $.post($editArea.data('url'), {
          _csrf: csrfToken,
          mode: 'gfm',
          context: $editArea.data('context'),
          text: plainText,
          wiki: true
        }, (data) => {
          preview.innerHTML = `<div class="markup ui segment">${data}</div>`;
          initMarkupContent();
        });
      };

      setTimeout(() => {
        if (!easyMDE.isSideBySideActive()) {
          render();
        } else {
          // delay preview by keystroke counting
          sideBySideChanges++;
          if (sideBySideChanges > 10) {
            render();
          }
          // or delay preview by timeout
          if (sideBySideTimeout !== null) {
            clearTimeout(sideBySideTimeout);
            sideBySideTimeout = null;
          }
          sideBySideTimeout = setTimeout(render, 600);
        }
      }, 0);
      if (!easyMDE.isSideBySideActive()) {
        return 'Loading...';
      }
      return preview.innerHTML;
    },
    renderingConfig: {
      singleLineBreaks: false
    },
    indentWithTabs: false,
    tabSize: 4,
    spellChecker: false,
    toolbar: ['bold', 'italic', 'strikethrough', '|',
      'heading-1', 'heading-2', 'heading-3', 'heading-bigger', 'heading-smaller', '|',
      {
        name: 'code-inline',
        action(e) {
          const cm = e.codemirror;
          const selection = cm.getSelection();
          cm.replaceSelection(`\`${selection}\``);
          if (!selection) {
            const cursorPos = cm.getCursor();
            cm.setCursor(cursorPos.line, cursorPos.ch - 1);
          }
          cm.focus();
        },
        className: 'fa fa-angle-right',
        title: 'Add Inline Code',
      }, 'code', 'quote', '|', {
        name: 'checkbox-empty',
        action(e) {
          const cm = e.codemirror;
          cm.replaceSelection(`\n- [ ] ${cm.getSelection()}`);
          cm.focus();
        },
        className: 'fa fa-square-o',
        title: 'Add Checkbox (empty)',
      },
      {
        name: 'checkbox-checked',
        action(e) {
          const cm = e.codemirror;
          cm.replaceSelection(`\n- [x] ${cm.getSelection()}`);
          cm.focus();
        },
        className: 'fa fa-check-square-o',
        title: 'Add Checkbox (checked)',
      }, '|',
      'unordered-list', 'ordered-list', '|',
      'link', 'image', 'table', 'horizontal-rule', '|',
      'clean-block', 'preview', 'fullscreen', 'side-by-side', '|',
      {
        name: 'revert-to-textarea',
        action(e) {
          e.toTextArea();
          hasEasyMDE = false;
          const $root = $form.find('.field.content');
          const loading = $root.data('loading');
          $root.append(`<div class="ui bottom tab markup" data-tab="preview">${loading}</div>`);
          initCompMarkupContentPreviewTab($form);
        },
        className: 'fa fa-file',
        title: 'Revert to simple textarea',
      },
    ]
  });

  attachEasyMDEToElements(easyMDE);

  const $mdeInputField = $(easyMDE.codemirror.getInputField());
  $mdeInputField.addClass('js-quick-submit');

  $form.on('submit', () => {
    if (!validateTextareaNonEmpty($editArea)) {
      return false;
    }
  });

  setTimeout(() => {
    const $bEdit = $('.repository.wiki.new .previewtabs a[data-tab="write"]');
    const $bPrev = $('.repository.wiki.new .previewtabs a[data-tab="preview"]');
    const $toolbar = $('.editor-toolbar');
    const $bPreview = $('.editor-toolbar button.preview');
    const $bSideBySide = $('.editor-toolbar a.fa-columns');
    $bEdit.on('click', (e) => {
      if (!hasEasyMDE) {
        return false;
      }
      e.stopImmediatePropagation();
      if ($toolbar.hasClass('disabled-for-preview')) {
        $bPreview.trigger('click');
      }

      return false;
    });
    $bPrev.on('click', (e) => {
      if (!hasEasyMDE) {
        return false;
      }
      e.stopImmediatePropagation();
      if (!$toolbar.hasClass('disabled-for-preview')) {
        $bPreview.trigger('click');
      }
      return false;
    });
    $bPreview.on('click', () => {
      setTimeout(() => {
        if ($toolbar.hasClass('disabled-for-preview')) {
          if ($bEdit.hasClass('active')) {
            $bEdit.removeClass('active');
          }
          if (!$bPrev.hasClass('active')) {
            $bPrev.addClass('active');
          }
        } else {
          if (!$bEdit.hasClass('active')) {
            $bEdit.addClass('active');
          }
          if ($bPrev.hasClass('active')) {
            $bPrev.removeClass('active');
          }
        }
      }, 0);

      return false;
    });
    $bSideBySide.on('click', () => {
      sideBySideChanges = 10;
    });
  }, 0);
}

export function initRepoWikiForm() {
  initRepoWikiFormEditor();
}