'use strict';

module.exports.create = function () {
  var PromiseA = require('bluebird');
  var enableDestroy = require('server-destroy');
  var server;

  function curState() {
    if (!server) {
      return PromiseA.resolve({running: false});
    }
    return PromiseA.resolve({
      running: true
    , port: server.address().port
    });
  }

  function start() {
    if (server) {
      return curState();
    }

    server = require('socksv5').createServer(function (info, accept) {
      accept();
    });

    enableDestroy(server);
    server.on('close', function () {
      server = null;
    });

    server.useAuth(require('socksv5').auth.None());

    return new PromiseA(function (resolve, reject) {
      server.on('error', function (err) {
        if (err.code === 'EADDRINUSE') {
          server.listen(0);
        } else {
          server = null;
          reject(err);
        }
      });
      server.listen(1080, function () {
        resolve(curState());
      });
    });
  }

  function stop() {
    if (!server) {
      return curState();
    }
    return new PromiseA(function (resolve, reject) {
      var timeoutId = setTimeout(function () {
        server.destroy();
      }, 1000);
      server.close(function (err) {
        clearTimeout(timeoutId);
        if (err) {
          reject(err);
        } else {
          resolve();
        }
      });
    });
  }

  return {
    isRunning: curState
  , start: start
  , stop: stop
  };
};