/*
 * SonarQube
 * Copyright (C) 2009-2019 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
const fs = require('fs');
const path = require('path');
const glob = require('glob-promise');

module.exports = function(source) {
  this.cacheable();

  const failure = this.async();
  const success = failure.bind(null, null);

  const config = this.exec(source, this.resourcePath);
  const root = path.resolve(path.dirname(this.resourcePath), config.root);
  this.addContextDependency(root);

  glob(root + '/**/*.md')
    .then(files => files.map(file => file.substr(root.length + 1)))
    .then(files =>
      files.map(file => ({
        path: file.slice(0, -3),
        content: handleIncludes(fs.readFileSync(root + '/' + file, 'utf8'), root)
      }))
    )
    .then(result => `module.exports = ${JSON.stringify(result)};`)
    .then(success)
    .catch(failure);
};

/**
 * @param {string} content
 * @param {string} root
 * @returns {string}
 */
function handleIncludes(content, root) {
  return content.replace(/@include (.+)/, (match, p) => {
    const filePath = path.join(root, '..', `${p}.md`);
    return fs.readFileSync(filePath, 'utf8');
  });
}