var util = require('util'),
    Events = require('events').EventEmitter,
    nodeunit  = require('nodeunit'),
    testCase  = require('nodeunit').testCase;

var StompClient = require('../lib/client').StompClient;
var connectionObserver;

// surpress logs for the test
util.log = function() {};

// check message headers are properties of Error object
function checkError(test, er, expectedHeaders, msg)
{
  var headers = {}
  for (var key in expectedHeaders) {
    headers[key] = er[key];
  }
  test.deepEqual(headers, expectedHeaders, msg);
}

// net mockage
var net = require('net');
var StompFrame = require('../lib/frame').StompFrame;

// Override StompFrame send function to allow inspection of frame data inside a test
var oldSend;
var oldCreateConnection;
var sendHook = function() {};

module.exports = testCase({

  setUp: function(callback) {
    // Mock net object so we never try to send any real data
    connectionObserver = new Events();
    connectionObserver.destroy = function() {};
    this.stompClient = new StompClient('127.0.0.1', 2098, 'user', 'pass', '1.0');

    oldCreateConnection = net.createConnection;
    net.createConnection = function() {
      return connectionObserver;
    };

    oldSend = StompFrame.prototype.send;
    StompFrame.prototype.send = function(stream) {
      var self = this;
      process.nextTick(function () {
        sendHook(self);
      });
    };

    callback();
  },

  tearDown: function(callback) {
    delete this.stompClient;
    sendHook = function() {};
    net.createConnection = oldCreateConnection;
    StompFrame.prototype.send = oldSend;
    callback();
  },

  'check default properties are correctly set on a basic StompClient': function(test) {
    var stompClient = new StompClient();

    test.equal(stompClient.user, '');
    test.equal(stompClient.pass, '');
    test.equal(stompClient.address, '127.0.0.1');
    test.equal(stompClient.port, 61613);
    test.equal(stompClient.version, '1.0');

    test.done();
  },

  'check StompClient construction from paremeters': function(test) {
    var stompClient = new StompClient(
      'test.host.net',1234,'uname','pw', '1.1', 'q1.host.net', 
      { retries: 10, delay: 1000 });

    test.equal(stompClient.user, 'uname');
    test.equal(stompClient.pass, 'pw');
    test.equal(stompClient.address, 'test.host.net');
    test.equal(stompClient.port, 1234);
    test.equal(stompClient.version, '1.1');
    test.equal(stompClient.vhost, 'q1.host.net');
    test.equal(stompClient.reconnectOpts.retries, 10);
    test.equal(stompClient.reconnectOpts.delay, 1000);

    test.done();
  },

  'check StompClient construction from options': function(test) {
    var stompClient = new StompClient( {
      address: 'test.host.net',
      port: 1234,
      user: 'uname',
      pass: 'pw', 
      protocolVersion: '1.1', 
      vhost: 'q1.host.net', 
      reconnectOpts: { retries: 10, delay: 1000 }});

    test.equal(stompClient.user, 'uname');
    test.equal(stompClient.pass, 'pw');
    test.equal(stompClient.address, 'test.host.net');
    test.equal(stompClient.port, 1234);
    test.equal(stompClient.version, '1.1');
    test.equal(stompClient.vhost, 'q1.host.net');
    test.equal(stompClient.reconnectOpts.retries, 10);
    test.equal(stompClient.reconnectOpts.delay, 1000);

    test.done();
  },

  'check StompClient TLS construction': function(test) {

    var stompClient = new StompClient(
      'test.host.net',1234,'uname','pw', null, null, null, true);
    test.deepEqual(stompClient.tls, {}, 'TLS not set by parameter');

    var stompClient = new StompClient(
      'test.host.net',1234,'uname','pw', null, null, null, false);
    test.ok(!stompClient.tls, 'TLS incorrectly set by parameter');

    var stompClient = new StompClient({ 
      host: 'secure.host.net',  
      tls: true,
      cert: 'dummy'
      });
    test.equal(stompClient.address, 'secure.host.net');
    test.deepEqual(stompClient.tls.cert, 'dummy', 'TLS not set by option');

    var stompClient = new StompClient({ 
      host: 'secure.host.net',  
      tls: false,
      cert: 'dummy'
      });
    test.equal(stompClient.address, 'secure.host.net');
    test.ok(!stompClient.tls, 'TLS incorrectly set by option');

    var stompClient = new StompClient({ 
      host: 'secure.host.net',  
      tls: {
        cert: 'dummy'
      }});
    test.equal(stompClient.address, 'secure.host.net');
    test.deepEqual(stompClient.tls.cert, 'dummy', 
      'TLS not set by nested option');

    test.done();
  },

  'check outbound CONNECT frame correctly follows protocol specification': function(test) {
    var self = this;
    test.expect(4);

    sendHook = function(stompFrame) {
      test.equal(stompFrame.command, 'CONNECT');
      test.deepEqual(stompFrame.headers, {
          login: 'user',
          passcode: 'pass'
      });
      test.equal(stompFrame.body, '');
      test.equal(stompFrame.contentLength, -1);

      test.done();
    };

    //start the test
    this.stompClient.connect();
    connectionObserver.emit('connect');

  },

  'check inbound CONNECTED frame parses correctly': function(test) {
    var self = this;
    var testId = '1234';

    test.expect(2);

    sendHook = function() {
      self.stompClient.stream.emit('data', 'CONNECTED\nsession:' + testId + '\n\n\0');
    };

    this.stompClient._stompFrameEmitter.on('CONNECTED', function (stompFrame) {
      test.equal(stompFrame.command, 'CONNECTED');
      test.equal(testId, stompFrame.headers.session);
      test.done();
    });

    //start the test
    this.stompClient.connect(function() {});
    connectionObserver.emit('connect');
  },

  'check the ERROR callback fires when we receive an error frame on connection': function (test) {
    var self = this,
      expectedHeaders = {
        message: 'some test error',
        'content-length' : 18
      },
      expectedBody = 'Error message body';

    test.expect(2);

    // mock that we received a CONNECTED from the stomp server in our send hook
    sendHook = function (stompFrame) {
      self.stompClient.stream.emit('data', 'ERROR\nmessage:' + expectedHeaders.message + '\ncontent-length:' + expectedHeaders['content-length']  + '\n\n' + expectedBody + '\0');
    };

    this.stompClient.connect(function () {
      test.ok(false, 'Success callback of connect() should not be called');
    }, function (headers, body) {
      checkError(test, headers, expectedHeaders, 'passed ERROR frame headers should be as expected');
      test.equal(body, expectedBody, 'passed ERROR frame body should be as expected');
      test.done();
    });

    connectionObserver.emit('connect');
  },

  'check outbound SUBSCRIBE frame correctly follows protocol specification': function(test) {
    var self = this;
    var testId = '1234';
    var destination = '/queue/someQueue';

    test.expect(10);

    //mock that we received a CONNECTED from the stomp server in our send hook
    sendHook = function(stompFrame) {
      self.stompClient.stream.emit('data', 'CONNECTED\nsession:' + testId + '\n\n\0');
    };

    // Once connected - subscribe to a fake queue
    this.stompClient._stompFrameEmitter.on('CONNECTED', function (stompFrame) {
      function unsubscribe() {
        sendHook = function (){};
        self.stompClient.unsubscribe(destination);
      }
      // Synchronous hooking of the .send(), vastly simplifying the tests below
      StompFrame.prototype.send = function(stream) {
        var self = this;
        sendHook(self);
      };

      //override the sendHook so we can test the latest stompframe to be sent
      sendHook = function(stompFrame) {
        test.equal(stompFrame.command, 'SUBSCRIBE');
        test.equal(stompFrame.headers.destination, destination);
        test.equal(stompFrame.headers.id, 'blah');
      };

      // note the use of additional id header (optional in spec) below :)
      self.stompClient.subscribe(destination, function(){}, { id: 'blah' });
      unsubscribe();

      sendHook = function(stompFrame) {
        test.equal(stompFrame.command, 'SUBSCRIBE');
        test.equal(stompFrame.headers.destination, destination);
        test.equal(stompFrame.headers.id, 'shucks');
      };

      // Note the natural argument order is used, and destination is ignored, it
      // gets overwritten by the real destination.
      self.stompClient.subscribe(destination, { id: 'shucks', destination: 'D' }, function(){});
      unsubscribe();

      // Subscribe without headers is valid
      sendHook = function(stompFrame) {
        test.equal(stompFrame.command, 'SUBSCRIBE');
        test.equal(stompFrame.headers.destination, destination);
      };

      self.stompClient.subscribe(destination, function(){});
      unsubscribe();

      // Subscribe without a callback is invalid, with or without headers
      try {
        self.stompClient.subscribe(destination, {});
      } catch(er) {
        test.ok(true);
      }
      unsubscribe();

      try {
        self.stompClient.subscribe(destination, {});
      } catch(er) {
        test.ok(true);
      }
      unsubscribe();

      test.done();
    });

    this.stompClient.connect(function() {});
    connectionObserver.emit('connect');
  },

  'check the SUBSCRIBE callback fires when we receive data down the destination queue': function(test) {
    var self = this;
    var testId = '1234';
    var destination = '/queue/someQueue';
    var messageId = 'ID:SomeID:1';
    var messageToBeSent = 'oh herrow!';

    test.expect(5);

    //mock that we received a CONNECTED from the stomp server in our send hook
    sendHook = function(stompFrame) {
      self.stompClient.stream.emit('data', 'CONNECTED\nsession:' + testId + '\n\n\0');
    };

    this.stompClient.connect(function() {

      // Mock inbound MESSAGE frame
      sendHook = function (stompFrame) {
        self.stompClient.stream.emit('data', 'MESSAGE\ndestination:' + destination + '\nmessage-id:' + messageId + '\n\n' + messageToBeSent + '\0');
      };

      // Subscribe to a queue, and upon receipt of message (wired above) test that body/headers correctly propogate to callback
      self.stompClient.subscribe(destination, function (body, headers) {
        test.equal(body, messageToBeSent, 'Received message matches the sent one');
        test.equal(headers['message-id'], messageId);
        test.equal(headers.destination, destination);
        test.equal(self.stompClient.subscriptions[destination].listeners.length, 1, 'ensure callback was added to subscription stack');

        // Unsubscribe and ensure queue is cleared of the subscription (and related callback)
        self.stompClient.unsubscribe(destination, {});

        test.equal(typeof self.stompClient.subscriptions[destination], 'undefined', 'ensure queue is cleared of the subscription');
        test.done();
      });

    });

    connectionObserver.emit('connect');
  },

  'check the MESSAGE callback fires when we receive a message': function(test) {
    var self = this;
    var testId = '1234';
    var destination = '/queue/someQueue';
    var messageId = 'ID:SomeID:1';
    var messageToBeSent = 'oh herrow!';

    test.expect(5);

    //mock that we received a CONNECTED from the stomp server in our send hook
    sendHook = function(stompFrame) {
      self.stompClient.stream.emit('data', 'CONNECTED\nsession:' + testId + '\n\n\0');
    };

    this.stompClient.connect(function() {

      // Mock inbound MESSAGE frame
      sendHook = function (stompFrame) {
        self.stompClient.stream.emit('data', 'MESSAGE\ndestination:' + destination + '\nmessage-id:' + messageId + '\n\n' + messageToBeSent + '\0');
      };

      // Subscribe to the queue, but don't do anything with the response
      self.stompClient.subscribe(destination, function () {});

      // Subscribe to the MESSAGE hook, and upon receipt of message (wired above) test that body/headers correctly propogate to callback
      self.stompClient.on('message', function (body, headers) {
        test.equal(body, messageToBeSent, 'Received message matches the sent one');
        test.equal(headers['message-id'], messageId);
        test.equal(headers.destination, destination);

        // Check the subscription has also been created
        test.equal(self.stompClient.subscriptions[destination].listeners.length, 1, 'ensure callback was added to subscription stack');

        // Unsubscribe and ensure queue is cleared of the subscription (and related callback)
        self.stompClient.unsubscribe(destination, {});

        test.equal(typeof self.stompClient.subscriptions[destination], 'undefined', 'ensure queue is cleared of the subscription');
        test.done();
      });

    });

    connectionObserver.emit('connect');
  },

  'check the ERROR callback fires when we receive an error frame on subscription': function (test) {
    var self = this,
      testId = '1234',
      destination = '/queue/someQueue',
      expectedHeaders = {
        message: 'some test error',
        'content-length' : 18
      },
      expectedBody = 'Error message body',
      errorCallbackCalled = false;

    test.expect(3);

    //mock that we received a CONNECTED from the stomp server in our send hook
    sendHook = function (stompFrame) {
      self.stompClient.stream.emit('data', 'CONNECTED\nsession:' + testId + '\n\n\0');
    };

    this.stompClient.connect(function () {

      // Mock inbound ERROR frame
      sendHook = function (stompFrame) {
        self.stompClient.stream.emit('data', 'ERROR\nmessage:' + expectedHeaders.message + '\ncontent-length:' + expectedHeaders['content-length']  + '\n\n' + expectedBody + '\0');
      };

      // make sure the error callback hasn't been called yet
      test.equal(errorCallbackCalled, false, 'ERROR callback should not have been called yet');

      // Subscribe to a queue, and upon receipt of message (wired above) test that body/headers correctly propogate to callback
      self.stompClient.subscribe(destination, function () {
        test.ok(false, 'Success callback of subscribe() should not be called');
      });

    }, function (headers, body) {
      errorCallbackCalled = true;
      checkError(test, headers, expectedHeaders, 'passed ERROR frame headers should be as expected');
      test.equal(body, expectedBody, 'passed ERROR frame body should be as expected');
      test.done();
    });

    connectionObserver.emit('connect');
  },

  'check outbound UNSUBSCRIBE frame correctly follows protocol specification': function (test) {
    var self = this;
    var testId = '1234';
    var destination = '/queue/someQueue';

    test.expect(4);

    //mock that we received a CONNECTED from the stomp server in our send hook
    sendHook = function(stompFrame) {
      self.stompClient.stream.emit('data', 'CONNECTED\nsession:' + testId + '\n\n\0');
    };

    // Once connected - unsubscribe to a fake queue
    this.stompClient._stompFrameEmitter.on('CONNECTED', function (stompFrame) {
      //override the sendHook so we can test the latest stompframe to be sent
      sendHook = function(stompFrame) {
        test.equal(stompFrame.command, 'UNSUBSCRIBE');
        test.equal(stompFrame.headers.destination, destination);
        test.equal(stompFrame.headers.id, 'specialid');
        test.done();
      };

      var before = { id: 'specialid' };
      var after = { id: 'specialid' };
      self.stompClient.unsubscribe(destination, after);
      test.deepEqual(before, after, "methods shouldn't modify their arguments");
    });

    this.stompClient.connect(function(){});
    connectionObserver.emit('connect');
  },

  'check the ERROR callback fires when we receive an error frame when unsubscribing': function (test) {
    var self = this,
      testId = '1234',
      destination = '/queue/someQueue',
      expectedHeaders = {
        message: 'some test error',
        'content-length' : 18
      },
      expectedBody = 'Error message body',
      errorCallbackCalled = false;

    test.expect(4);

    //mock that we received a CONNECTED from the stomp server in our send hook
    sendHook = function (stompFrame) {
      self.stompClient.stream.emit('data', 'CONNECTED\nsession:' + testId + '\n\n\0');
    };

    this.stompClient.connect(function () {

      // Mock inbound MESSAGE frame
      sendHook = function (stompFrame) {
        self.stompClient.stream.emit('data', 'MESSAGE\ndestination:' + destination + '\nmessage-id:some message id\n\nsome message body\0');
      };

      // make sure the error callback hasn't been called yet
      test.equal(errorCallbackCalled, false, 'ERROR callback should not have been called yet');

      // Subscribe to a queue, and upon receipt of message (wired above) test that body/headers correctly propogate to callback
      self.stompClient.subscribe(destination, function () {

        // Mock inbound ERROR frame
        sendHook = function (stompFrame) {
          self.stompClient.stream.emit('data', 'ERROR\nmessage:' + expectedHeaders.message + '\ncontent-length:' + expectedHeaders['content-length']  + '\n\n' + expectedBody + '\0');
        };

        test.equal(errorCallbackCalled, false, 'ERROR callback should not have been called yet');

        self.stompClient.unsubscribe(destination, { id: 'specialid' });

      });

    }, function (headers, body) {
      errorCallbackCalled = true;
      checkError(test, headers, expectedHeaders, 'passed ERROR frame headers should be as expected');
      test.equal(body, expectedBody, 'passed ERROR frame body should be as expected');
      test.done();
    });

    connectionObserver.emit('connect');
  },

  'check outbound SEND frame correctly follows protocol specification': function (test) {
    var self = this;
    var testId = '1234';
    var destination = '/queue/someQueue';
    var messageToBeSent = 'oh herrow!';

    test.expect(3);

    //mock that we received a CONNECTED from the stomp server in our send hook
    sendHook = function (stompFrame) {
      self.stompClient.stream.emit('data', 'CONNECTED\nsession:' + testId + '\n\n\0');
    };

    this.stompClient.connect(function() {

      sendHook = function(stompFrame) {
        test.equal(stompFrame.command, 'SEND');
        test.deepEqual(stompFrame.headers, { destination: destination });
        test.equal(stompFrame.body, messageToBeSent);
        test.done();
      };

      self.stompClient.publish(destination, messageToBeSent);

    });

    connectionObserver.emit('connect');
  },

  'check outbound SEND header correctly follows protocol specification': function (test) {
    var self = this;
    var testId = '1234';
    var destination = '/queue/someQueue';
    var messageToBeSent = 'oh herrow!';
    var headers = {
      destination: 'TO BE OVERWRITTEN',
      'content-type': 'text/plain'
    };

    test.expect(3);

    //mock that we received a CONNECTED from the stomp server in our send hook
    sendHook = function (stompFrame) {
      self.stompClient.stream.emit('data', 'CONNECTED\nsession:' + testId + '\n\n\0');
    };

    this.stompClient.connect(function() {

      sendHook = function(stompFrame) {
        test.equal(stompFrame.command, 'SEND');
        headers.destination = destination;
        test.deepEqual(stompFrame.headers, headers);
        test.equal(stompFrame.body, messageToBeSent);
        test.done();
      };

      self.stompClient.publish(destination, messageToBeSent, headers);

    });

    connectionObserver.emit('connect');
  },

  'check parseError event fires when malformed frame is received': function(test) {
    var self = this;

    test.expect(2);

    //mock that we received a CONNECTED from the stomp server in our send hook
    sendHook = function (stompFrame) {
      self.stompClient.stream.emit('data', 'CONNECTED\n\n\n\0');
    };

    this.stompClient.on('error', function (err) {
      test.equal(err.message, 'Header "session" is required for CONNECTED');
      test.equal(err.details, 'Frame: {"command":"CONNECTED","headers":{},"body":"\\n"}');
      test.done();
    });

    this.stompClient.connect(function() {});
    connectionObserver.emit('connect');
  },

  'check disconnect method correctly sends DISCONNECT frame, disconnects TCP stream, and fires callback': function (test) {
    var self = this;

    test.expect(5);

    //mock that we received a CONNECTED from the stomp server in our send hook
    sendHook = function (stompFrame) {
      self.stompClient.stream.emit('data', 'CONNECTED\nsession:blah\n\n\0');
    };

    self.stompClient.connect(function() {

      // Assert next outbound STOMP frame is a DISCONNECT
      sendHook = function (stompFrame) {
        test.equal(stompFrame.command, 'DISCONNECT');
        test.deepEqual(stompFrame.headers, {});
        test.equal(stompFrame.body, '');
      };

      // Set disconnection callback to ensure it is called appropriately
      self.stompClient.disconnect(function () {
        test.ok(true, 'disconnect callback executed');
        test.done();
      });

    });

    // Mock the TCP end call
    connectionObserver.end = function() {
      test.ok(true, 'TCP end call made');
      connectionObserver.end = function(){};
      process.nextTick(function() { connectionObserver.emit('end'); });
    };

    connectionObserver.emit('connect');
  }

});