/*
global CodeMirror loadScript css_beautify
global editors getSectionForChild showHelp
*/
'use strict';

function beautify(event) {
  loadScript('/vendor-overwrites/beautify/beautify-css-mod.js')
    .then(() => {
      if (!window.css_beautify && window.exports) {
        window.css_beautify = window.exports.css_beautify;
      }
    })
    .then(doBeautify);

  function doBeautify() {
    const tabs = prefs.get('editor.indentWithTabs');
    const options = prefs.get('editor.beautify');
    for (const k of Object.keys(prefs.defaults['editor.beautify'])) {
      if (!(k in options)) options[k] = prefs.defaults['editor.beautify'][k];
    }
    options.indent_size = tabs ? 1 : prefs.get('editor.tabSize');
    options.indent_char = tabs ? '\t' : ' ';

    const section = getSectionForChild(event.target);
    const scope = section ? [section.CodeMirror] : editors;

    showHelp(t('styleBeautify'),
      $create([
        $create('.beautify-options', [
          $createOption('.selector1,', 'selector_separator_newline'),
          $createOption('.selector2', 'newline_before_open_brace'),
          $createOption('{', 'newline_after_open_brace'),
          $createOption('border: none;', 'newline_between_properties', true),
          $createOption('display: block;', 'newline_before_close_brace', true),
          $createOption('}', 'newline_between_rules'),
          $createLabeledCheckbox('preserve_newlines', 'styleBeautifyPreserveNewlines'),
          $createLabeledCheckbox('indent_conditional', 'styleBeautifyIndentConditional'),
        ]),
        $create('.buttons', [
          $create('button', {
            attributes: {role: 'close'},
            // showHelp.close will be defined after showHelp() is invoked
            onclick: () => showHelp.close(),
          }, t('confirmClose')),
          $create('button', {
            attributes: {role: 'undo'},
            onclick() {
              let undoable = false;
              for (const cm of scope) {
                const data = cm.beautifyChange;
                if (!data || !data[cm.changeGeneration()]) continue;
                delete data[cm.changeGeneration()];
                const {scrollX, scrollY} = window;
                cm.undo();
                cm.scrollIntoView(cm.getCursor());
                window.scrollTo(scrollX, scrollY);
                undoable |= data[cm.changeGeneration()];
              }
              this.disabled = !undoable;
            },
          }, t(scope.length === 1 ? 'undo' : 'undoGlobal')),
        ]),
      ]));

    $('#help-popup').className = 'wide';

    scope.forEach(cm => {
      setTimeout(() => {
        const pos = options.translate_positions =
          [].concat.apply([], cm.doc.sel.ranges.map(r =>
            [Object.assign({}, r.anchor), Object.assign({}, r.head)]));
        const text = cm.getValue();
        const newText = css_beautify(text, options);
        if (newText !== text) {
          if (!cm.beautifyChange || !cm.beautifyChange[cm.changeGeneration()]) {
            // clear the list if last change wasn't a css-beautify
            cm.beautifyChange = {};
          }
          cm.setValue(newText);
          const selections = [];
          for (let i = 0; i < pos.length; i += 2) {
            selections.push({anchor: pos[i], head: pos[i + 1]});
          }
          const {scrollX, scrollY} = window;
          cm.setSelections(selections);
          window.scrollTo(scrollX, scrollY);
          cm.beautifyChange[cm.changeGeneration()] = true;
          $('#help-popup button[role="close"]').disabled = false;
        }
      });
    });

    $('.beautify-options').onchange = ({target}) => {
      const value = target.type === 'checkbox' ? target.checked : target.selectedIndex > 0;
      prefs.set('editor.beautify', Object.assign(options, {[target.dataset.option]: value}));
      if (target.parentNode.hasAttribute('newline')) {
        target.parentNode.setAttribute('newline', value.toString());
      }
      doBeautify();
    };

    function $createOption(label, optionName, indent) {
      const value = options[optionName];
      return (
        $create('div', {attributes: {newline: value}}, [
          $create('span', indent ? {attributes: {indent: ''}} : {}, label),
          $create('div.select-resizer', [
            $create('select', {dataset: {option: optionName}}, [
              $create('option', {selected: !value}, '\xA0'),
              $create('option', {selected: value}, '\\n'),
            ]),
            $create('SVG:svg.svg-icon.select-arrow', {viewBox: '0 0 1792 1792'}, [
              $create('SVG:path', {
                'fill-rule': 'evenodd',
                'd': 'M1408 704q0 26-19 45l-448 448q-19 19-45 ' +
                     '19t-45-19l-448-448q-19-19-19-45t19-45 45-19h896q26 0 45 19t19 45z'
              }),
            ]),
          ]),
        ])
      );
    }

    function $createLabeledCheckbox(optionName, i18nKey) {
      return (
        $create('label', {style: 'display: block; clear: both;'}, [
          $create('input', {
            type: 'checkbox',
            dataset: {option: optionName},
            checked: options[optionName] !== false
          }),
          $create('SVG:svg.svg-icon.checked',
            $create('SVG:use', {'xlink:href': '#svg-icon-checked'})),
          t(i18nKey),
        ])
      );
    }
  }
}