'use strict';

const minify = require('../../utils/Minify');
const plugins = require('../../../static/js/pluginfw/plugin_defs');
const CachingMiddleware = require('../../utils/caching_middleware');
const Yajsml = require('etherpad-yajsml');
const _ = require('underscore');

exports.expressCreateServer = (hookName, args, cb) => {
  // Cache both minified and static.
  const assetCache = new CachingMiddleware();
  args.app.all(/\/javascripts\/(.*)/, assetCache.handle);

  // Minify will serve static files compressed (minify enabled). It also has
  // file-specific hacks for ace/require-kernel/etc.
  args.app.all('/static/:filename(*)', minify.minify);

  // Setup middleware that will package JavaScript files served by minify for
  // CommonJS loader on the client-side.
  // Hostname "invalid.invalid" is a dummy value to allow parsing as a URI.
  const jsServer = new (Yajsml.Server)({
    rootPath: 'javascripts/src/',
    rootURI: 'http://invalid.invalid/static/js/',
    libraryPath: 'javascripts/lib/',
    libraryURI: 'http://invalid.invalid/static/plugins/',
    requestURIs: minify.requestURIs, // Loop-back is causing problems, this is a workaround.
  });

  const StaticAssociator = Yajsml.associators.StaticAssociator;
  const associations =
    Yajsml.associators.associationsForSimpleMapping(minify.tar);
  const associator = new StaticAssociator(associations);
  jsServer.setAssociator(associator);

  args.app.use(jsServer.handle.bind(jsServer));

  // serve plugin definitions
  // not very static, but served here so that client can do
  // require("pluginfw/static/js/plugin-definitions.js");
  args.app.get('/pluginfw/plugin-definitions.json', (req, res, next) => {
    const clientParts = _(plugins.parts)
        .filter((part) => _(part).has('client_hooks'));

    const clientPlugins = {};

    _(clientParts).chain()
        .map((part) => part.plugin)
        .uniq()
        .each((name) => {
          clientPlugins[name] = _(plugins.plugins[name]).clone();
          delete clientPlugins[name].package;
        });

    res.header('Content-Type', 'application/json; charset=utf-8');
    res.write(JSON.stringify({plugins: clientPlugins, parts: clientParts}));
    res.end();
  });

  return cb();
};