/* global createWorkerApi */// worker-util.js
'use strict';

(() => {
  let sugarss = false;

  /** @namespace EditorWorker */
  createWorkerApi({

    async csslint(code, config) {
      require(['/js/csslint/parserlib', '/js/csslint/csslint']); /* global CSSLint */
      return CSSLint
        .verify(code, config).messages
        .map(m => Object.assign(m, {rule: {id: m.rule.id}}));
    },

    getCssPropsValues() {
      require(['/js/csslint/parserlib']); /* global parserlib */
      const {
        css: {Colors, GlobalKeywords, Properties},
        util: {describeProp},
      } = parserlib;
      const namedColors = Object.keys(Colors);
      const rxNonWord = /(?:<.+?>|[^-\w<(]+\d*)+/g;
      const res = {};
      // moving vendor-prefixed props to the end
      const cmp = (a, b) => a[0] === '-' && b[0] !== '-' ? 1 : a < b ? -1 : a > b;
      for (const [k, v] of Object.entries(Properties)) {
        res[k] = false;
        if (typeof v === 'string') {
          let last = '';
          const uniq = [];
          // strip definitions of function arguments
          const desc = describeProp(v).replace(/([-\w]+)\(.*?\)/g, 'z-$1');
          const descNoColors = desc.replace(/<named-color>/g, '');
          // add a prefix to functions to group them at the end
          const words = descNoColors.split(rxNonWord).sort(cmp);
          for (let w of words) {
            if (w.startsWith('z-')) w = w.slice(2) + '(';
            if (w !== last) uniq.push(last = w);
          }
          if (desc !== descNoColors) uniq.push(...namedColors);
          if (uniq.length) res[k] = uniq;
        }
      }
      return {all: res, global: GlobalKeywords};
    },

    getRules(linter) {
      return ruleRetriever[linter](); // eslint-disable-line no-use-before-define
    },

    metalint(code) {
      require(['/js/meta-parser']); /* global metaParser */
      const result = metaParser.lint(code);
      // extract needed info
      result.errors = result.errors.map(err => ({
        code: err.code,
        args: err.args,
        message: err.message,
        index: err.index,
      }));
      return result;
    },

    async stylelint(opts) {
      require(['/vendor/stylelint-bundle/stylelint-bundle.min']); /* global stylelint */
      // Stylus-lang allows a trailing ";" but sugarss doesn't, so we monkeypatch it
      stylelint.SugarSSParser.prototype.checkSemicolon = tt => {
        while (tt.length && tt[tt.length - 1][0] === ';') tt.pop();
      };
      for (const pass of opts.mode === 'stylus' ? [sugarss, !sugarss] : [-1]) {
        /* We try sugarss (for indented stylus-lang), then css mode, switching them on failure,
         * so that the succeeding syntax will be used next time first. */
        opts.config.customSyntax = !pass ? 'sugarss' : '';
        try {
          const res = await stylelint.createLinter(opts)._lintSource(opts);
          if (pass !== -1) sugarss = pass;
          return collectStylelintResults(res, opts);
        } catch (e) {
          const fatal = pass === -1 ||
            !pass && !/^CssSyntaxError:.+?Unnecessary curly bracket/.test(e) ||
            pass && !/^CssSyntaxError:.+?Unknown word[\s\S]*?\.decl\s/.test(`${e}${e.stack}`);
          if (fatal) {
            return [{
              from: {line: e.line - 1, ch: e.column - 1},
              to: {line: e.line - 1, ch: e.column - 1},
              message: e.reason,
              severity: 'error',
              rule: e.name,
            }];
          }
        }
      }
    },
  });

  const ruleRetriever = {

    csslint() {
      require(['/js/csslint/csslint']);
      return CSSLint.getRuleList().map(rule => {
        const output = {};
        for (const [key, value] of Object.entries(rule)) {
          if (typeof value !== 'function') {
            output[key] = value;
          }
        }
        return output;
      });
    },

    stylelint() {
      require(['/vendor/stylelint-bundle/stylelint-bundle.min']);
      const options = {};
      const rxPossible = /\bpossible:("(?:[^"]*?)"|\[(?:[^\]]*?)\]|\{(?:[^}]*?)\})/g;
      const rxString = /"([-\w\s]{3,}?)"/g;
      for (const [id, rule] of Object.entries(stylelint.rules)) {
        const ruleCode = `${rule()}`;
        const sets = [];
        let m, mStr;
        while ((m = rxPossible.exec(ruleCode))) {
          const possible = m[1];
          const set = [];
          while ((mStr = rxString.exec(possible))) {
            const s = mStr[1];
            if (s.includes(' ')) {
              set.push(...s.split(/\s+/));
            } else {
              set.push(s);
            }
          }
          if (possible.includes('ignoreAtRules')) {
            set.push('ignoreAtRules');
          }
          if (possible.includes('ignoreShorthands')) {
            set.push('ignoreShorthands');
          }
          if (set.length) {
            sets.push(set);
          }
        }
        options[id] = sets;
      }
      return options;
    },
  };

  function collectStylelintResults({messages}, {mode}) {
    /* We hide nonfatal "//" warnings since we lint with sugarss without applying @preprocessor.
     * We can't easily pre-remove "//"  comments which may be inside strings, comments, url(), etc.
     * And even if we did, it'd be wrong to hide potential bugs in stylus-lang like #1460 */
    const isLess = mode === 'text/x-less';
    const slashCommentAllowed = isLess || mode === 'stylus';
    const res = [];
    for (const m of messages) {
      if (/deprecation|invalidOption/.test(m.stylelintType)) {
        continue;
      }
      const {rule} = m;
      const msg = m.text.replace(/^Unexpected\s+/, '').replace(` (${rule})`, '');
      if (slashCommentAllowed && msg.includes('"//"') ||
          isLess && /^unknown at-rule "@[-\w]+:"/.test(msg) /* LESS variables */) {
        continue;
      }
      res.push({
        from: {line: m.line - 1, ch: m.column - 1},
        to: {line: m.endLine - 1, ch: m.endColumn - 1},
        message: msg[0].toUpperCase() + msg.slice(1),
        severity: m.severity,
        rule,
      });
    }
    return res;
  }
})();