'use strict';

// Extracts the main menu and sub-menu links form locale's site.json and
// adds them to the metadata. This data is used in the navigation template
module.exports = function buildNavigation(latestVersions) {
  return (files, metalsmith, done) => {
    const meta = metalsmith.metadata();
    meta.nav = {};
    generateNavigation(meta.site, 'main');
    metalsmith.metadata(meta);
    done();
    function generateNavigation(obj, level) {
      const parent = [];
      if (obj.link && obj.text) {
        parent.push(obj);
      }
      Object.keys(obj).forEach((key) => {
        if (obj[key].link && obj[key].text) {
          // Insert latest versions for API docs
          if (key === 'api-current') {
            obj[key].text = obj[key].text.replace(
              /%ver%/,
              latestVersions.current.node
            );
            obj[key].link = obj[key].link.replace(
              /%ver-major%/,
              latestVersions.current.nodeMajor
            );
          }
          if (key === 'api-lts') {
            obj[key].text = obj[key].text.replace(
              /%ver%/,
              latestVersions.lts.node
            );
            obj[key].link = obj[key].link.replace(
              /%ver-major%/,
              latestVersions.lts.nodeMajor
            );
          }

          meta.nav[level] = meta.nav[level] || parent;
          meta.nav[level].push(obj[key]);
          generateNavigation(obj[key], key);
        }
      });
    }
  };
};