'use strict';

module.exports.create = function () {
  var handlers =  {
    //
    // set,get,remove challenges
    //
    // Note: this is fine for a one-off CLI tool
    // but a webserver using node-cluster or multiple
    // servers should use a database of some sort
    _challenges: {}
  , setChallenge: function (args, key, value, cb) {
      handlers._challenges[key] = value;
      cb(null);
    }
  , getChallenge: function (args, key, cb) {
      // TODO keep in mind that, generally get args are just args.domains
      // and it is disconnected from the flow of setChallenge and removeChallenge
      cb(null, handlers._challenges[key]);
    }
  , removeChallenge: function (args, key, cb) {
      delete handlers._challenges[key];
      cb(null);
    }

  , _servers: []
  , httpResponder: function (req, res) {
      var acmeChallengePrefix = '/.well-known/acme-challenge/';

      if (0 !== req.url.indexOf(acmeChallengePrefix)) {
        res.end('Hello World!');
        return;
      }

      var key = req.url.slice(acmeChallengePrefix.length);

      handlers.getChallenge(req.headers.host, key, function (err, val) {
        res.end(val || '_');
      });
    }
  , startServers: function (plainPorts, tlsPorts) {
      var httpsOptions = require('localhost.daplie.com-certificates');
      var https = require('https');
      var http = require('http');

      // tls-sni-01-port
      if (handlers._servers.length) {
        return;
      }

      plainPorts.forEach(function (port) {
        http.createServer(handlers.httpResponder).listen(port, function () {
          console.info('Listening http on', this.address());
        });
      });
      tlsPorts.forEach(function (port) {
        https.createServer(httpsOptions, handlers.httpResponder).listen(port, function () {
          console.info('Listening https on', this.address());
        });
      });
    }
  , closeServers: function () {
      handlers._servers.forEach(function (server) {
        server.close();
      });
      handlers._servers = [];
    }
  };

  return handlers;
};