// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

(function (mod) {
  if (typeof exports == 'object' && typeof module == 'object')
    // CommonJS
    mod(require('../../lib/codemirror'), require('../../mode/css/css'));
  else if (typeof define == 'function' && define.amd)
    // AMD
    define(['../../lib/codemirror', '../../mode/css/css'], mod); // Plain browser env
  else mod(CodeMirror);
})(function (CodeMirror) {
  'use strict';

  var pseudoClasses = { link: 1, visited: 1, active: 1, hover: 1, focus: 1, 'first-letter': 1, 'first-line': 1, 'first-child': 1, before: 1, after: 1, lang: 1 };

  CodeMirror.registerHelper('hint', 'css', function (cm) {
    var cur = cm.getCursor(),
      token = cm.getTokenAt(cur);
    var inner = CodeMirror.innerMode(cm.getMode(), token.state);
    if (inner.mode.name != 'css') return;

    var start = token.start,
      end = cur.ch,
      word = token.string.slice(0, end - start);
    if (/[^\w$_-]/.test(word)) {
      word = '';
      start = end = cur.ch;
    }

    var spec = CodeMirror.resolveMode('text/css');

    var result = [];
    function add(keywords) {
      for (var name in keywords) if (!word || name.lastIndexOf(word, 0) == 0) result.push(name);
    }

    var st = inner.state.state;
    if (st == 'pseudo' || token.type == 'variable-3') {
      add(pseudoClasses);
    } else if (st == 'block' || st == 'maybeprop') {
      add(spec.propertyKeywords);
    } else if (st == 'prop' || st == 'parens' || st == 'at' || st == 'params') {
      add(spec.valueKeywords);
      add(spec.colorKeywords);
    } else if (st == 'media' || st == 'media_parens') {
      add(spec.mediaTypes);
      add(spec.mediaFeatures);
    }

    if (result.length)
      return {
        list: result,
        from: CodeMirror.Pos(cur.line, start),
        to: CodeMirror.Pos(cur.line, end),
      };
  });
});
