// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

'use strict';

const assert = require('assert');
const http = require('http');

const error = require('../../lib/error');
const util = require('../../http/util');
const promise = require('../../lib/promise');

describe('selenium-webdriver/http/util', function() {

  var server, baseUrl;

  var status, value, responseCode;

  function startServer(done) {
    if (server) return done();

    server = http.createServer(function(req, res) {
      var data = JSON.stringify({status: status, value: value});
      res.writeHead(responseCode, {
        'Content-Type': 'application/json; charset=utf-8',
        'Content-Length': Buffer.byteLength(data, 'utf8')
      });
      res.end(data);
    });

    server.listen(0, '127.0.0.1', function(e) {
      if (e) return done(e);

      var addr = server.address();
      baseUrl = 'http://' + addr.address + ':' + addr.port;
      done();
    });
  }

  function killServer(done) {
    if (!server) return done();
    server.close(done);
    server = null;
  }

  after(killServer);

  beforeEach(function(done) {
    status = 0;
    value = 'abc123';
    responseCode = 200;
    startServer(done);
  });

  describe('#getStatus', function() {
    it('should return value field on success', function() {
      return util.getStatus(baseUrl).then(function(response) {
        assert.equal('abc123', response);
      });
    });

    it('should fail if response object is not success', function() {
      status = 1;
      return util.getStatus(baseUrl).then(function() {
        throw Error('expected a failure');
      }, function(err) {
        assert.ok(err instanceof error.WebDriverError);
        assert.equal(err.code, error.WebDriverError.code);
        assert.equal(err.message, value);
      });
    });

    it('should fail if the server is not listening', function(done) {
      killServer(function(e) {
        if(e) return done(e);

        util.getStatus(baseUrl).then(function() {
          done(Error('expected a failure'));
        }, function() {
          // Expected.
          done();
        });
      });
    });

    it('should fail if HTTP status is not 200', function() {
      status = 1;
      responseCode = 404;
      return util.getStatus(baseUrl).then(function() {
        throw Error('expected a failure');
      }, function(err) {
        assert.ok(err instanceof error.WebDriverError);
        assert.equal(err.code, error.WebDriverError.code);
        assert.equal(err.message, value);
      });
    });
  });

  describe('#waitForServer', function() {
    it('resolves when server is ready', function() {
      status = 1;
      setTimeout(function() { status = 0; }, 50);
      return util.waitForServer(baseUrl, 100);
    });

    it('should fail if server does not become ready', function() {
      status = 1;
      return util.waitForServer(baseUrl, 50).
          then(function() {throw Error('Expected to time out')},
               function() {});
    });

    it('can cancel wait', function() {
      status = 1;
      let cancel = new Promise(resolve => {
        setTimeout(_ => resolve(), 50)
      });
      return util.waitForServer(baseUrl, 200, cancel)
          .then(
              () => { throw Error('Did not expect to succeed!'); },
              (e) => assert.ok(e instanceof promise.CancellationError));
    });
  });

  describe('#waitForUrl', function() {
    it('succeeds when URL returns 2xx', function() {
      responseCode = 404;
      setTimeout(function() { responseCode = 200; }, 50);

      return util.waitForUrl(baseUrl, 200);
    });

    it('fails if URL always returns 4xx', function() {
      responseCode = 404;

      return util.waitForUrl(baseUrl, 50)
          .then(() => assert.fail('Expected to time out'),
                () => true);
    });

    it('fails if cannot connect to server', function() {
      return new Promise((resolve, reject) => {
        killServer(function(e) {
          if (e) return reject(e);

          util.waitForUrl(baseUrl, 50).
              then(function() { reject(Error('Expected to time out')); },
                   function() { resolve(); });
        });
      });
    });

    it('can cancel wait', function() {
      responseCode = 404;
      let cancel = new Promise(resolve => {
        setTimeout(_ => resolve(), 50);
      });
      return util.waitForUrl(baseUrl, 200, cancel)
          .then(
              () => { throw Error('Did not expect to succeed!'); },
              (e) => assert.ok(e instanceof promise.CancellationError));
    });
  });
});