// 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 net = require('net');

const portprober = require('../../net/portprober');

describe('isFree', function() {

  var server;

  beforeEach(function() {
    server = net.createServer(function(){});
  })

  afterEach(function(done) {
    if (!server) return done();
    server.close(function() {
      done();
    });
  });

  it('should work for INADDR_ANY', function(done) {
    server.listen(0, function() {
      var port = server.address().port;
      assertPortNotfree(port).then(function() {
        return new Promise(resolve => {
          server.close(function() {
            server = null;
            resolve(assertPortIsFree(port));
          });
        });
      }).then(function() { done(); }, done);
    });
  });

  it('should work for a specific host', function(done) {
    var host = '127.0.0.1';
    server.listen(0, host, function() {
      var port = server.address().port;
      assertPortNotfree(port, host).then(function() {
        return new Promise(resolve => {
          server.close(function() {
            server = null;
            resolve(assertPortIsFree(port, host));
          });
        });
      }).then(function() { done(); }, done);
    });
  });
});

describe('findFreePort', function() {
  var server;

  beforeEach(function() {
    server = net.createServer(function(){});
  })

  afterEach(function(done) {
    if (!server) return done();
    server.close(function() {
      done();
    });
  });

  it('should work for INADDR_ANY', function(done) {
    portprober.findFreePort().then(function(port) {
      server.listen(port, function() {
        assertPortNotfree(port).then(function() {
          return new Promise(resolve => {
            server.close(function() {
              server = null;
              resolve(assertPortIsFree(port));
            });
          });
        }).then(function() { done(); }, done);
      });
    });
  });

  it('should work for a specific host', function(done) {
    var host = '127.0.0.1';
    portprober.findFreePort(host).then(function(port) {
      server.listen(port, host, function() {
        assertPortNotfree(port, host).then(function() {
          return new Promise(resolve => {
            server.close(function() {
              server = null;
              resolve(assertPortIsFree(port, host));
            });
          });
        }).then(function() { done(); }, done);
      });
    });
  });
});


function assertPortIsFree(port, opt_host) {
  return portprober.isFree(port, opt_host).then(function(free) {
    assert.ok(free, 'port should be free');
  });
}


function assertPortNotfree(port, opt_host) {
  return portprober.isFree(port, opt_host).then(function(free) {
    assert.ok(!free, 'port should is not free');
  });
}