/* eslint no-underscore-dangle: off */

'use strict';

const fs = require('fs');
const http = require('http');
const https = require('https');

function ServerBuilder() {
  this._host = null;
  this._port = 9001;
}

ServerBuilder.prototype.build = function build() {
  if (this._key && this._cert) {
    const options = {
      key: this._key,
      cert: this._cert,
    };
    return https
      .createServer(options, this._callback)
      .listen(this._port, this._host);
  }

  return http.createServer(this._callback).listen(this._port, this._host);
};

ServerBuilder.prototype.host = function hostf(host) {
  this._host = host;
  return this;
};

ServerBuilder.prototype.port = function portf(port) {
  this._port = port;
  return this;
};

ServerBuilder.prototype.secure = function secure(keyPath, certPath) {
  try {
    this._key = fs.readFileSync(keyPath);
    this._cert = fs.readFileSync(certPath);
  } catch (e) {
    throw new Error('No key or certificate file found');
  }

  return this;
};

ServerBuilder.prototype.use = function use(callback) {
  this._callback = callback;
  return this;
};

module.exports = () => new ServerBuilder();