var vows = require('vows'),
    sandbox = require('sandboxed-module'),
    assert = require('assert');

function makeFakeNet() {
    return {
        logEvents: [],
        data: [],
        cbs: {},
        createConnectionCalled: 0,
        fakeAppender: function(logEvent) {
            this.logEvents.push(logEvent);
        },
        createConnection: function(port, host) {
            var fakeNet = this;
            this.port = port;
            this.host = host;
            this.createConnectionCalled += 1;
            return {
                on: function(evt, cb) {
                    fakeNet.cbs[evt] = cb;
                },
                write: function(data, encoding) {
                    fakeNet.data.push(data);
                    fakeNet.encoding = encoding;
                },
                end: function() {
                    fakeNet.closeCalled = true;
                }
            };
        },
        createServer: function(cb) {
          var fakeNet = this;
          cb({
            remoteAddress: '1.2.3.4',
            remotePort: '1234',
            setEncoding: function(encoding) {
              fakeNet.encoding = encoding;
            },
            on: function(event, cb) {
              fakeNet.cbs[event] = cb;
            }
          });

          return {
            listen: function(port, host) {
              fakeNet.port = port;
              fakeNet.host = host;
            }
          };
        }
    };
}

vows.describe('Multiprocess Appender').addBatch({
    'worker': {
        topic: function() {
            var fakeNet = makeFakeNet(),
                appender = sandbox.require(
                    '../lib/appenders/multiprocess',
                    {
                        requires: {
                            'net': fakeNet
                        }
                    }
                ).appender({ mode: 'worker', loggerPort: 1234, loggerHost: 'pants' });

            //don't need a proper log event for the worker tests
            appender('before connect');
            fakeNet.cbs['connect']();
            appender('after connect');
            fakeNet.cbs['close'](true);
            appender('after error, before connect');
            fakeNet.cbs['connect']();
            appender('after error, after connect');

            return fakeNet;
        },
        'should open a socket to the loggerPort and loggerHost': function(net) {
            assert.equal(net.port, 1234);
            assert.equal(net.host, 'pants');
        },
        'should buffer messages written before socket is connected': function(net) {
            assert.equal(net.data[0], JSON.stringify('before connect'));
        },
        'should write log messages to socket as json strings with a terminator string': function(net) {
            assert.equal(net.data[0], JSON.stringify('before connect'));
            assert.equal(net.data[1], '__LOG4JS__');
            assert.equal(net.data[2], JSON.stringify('after connect'));
            assert.equal(net.data[3], '__LOG4JS__');
            assert.equal(net.encoding, 'utf8');
        },
        'should attempt to re-open the socket on error': function(net) {
            assert.equal(net.data[4], JSON.stringify('after error, before connect'));
            assert.equal(net.data[5], '__LOG4JS__');
            assert.equal(net.data[6], JSON.stringify('after error, after connect'));
            assert.equal(net.data[7], '__LOG4JS__');
            assert.equal(net.createConnectionCalled, 2);
        }
    },
    'worker with timeout': {
        topic: function() {
            var fakeNet = makeFakeNet(),
                appender = sandbox.require(
                    '../lib/appenders/multiprocess',
                    {
                        requires: {
                            'net': fakeNet
                        }
                    }
                ).appender({ mode: 'worker' });

            //don't need a proper log event for the worker tests
            appender('before connect');
            fakeNet.cbs['connect']();
            appender('after connect');
            fakeNet.cbs['timeout']();
            appender('after timeout, before close');
            fakeNet.cbs['close']();
            appender('after close, before connect');
            fakeNet.cbs['connect']();
            appender('after close, after connect');

            return fakeNet;
        },
        'should attempt to re-open the socket': function(net) {
            //skipping the __LOG4JS__ separators
            assert.equal(net.data[0], JSON.stringify('before connect'));
            assert.equal(net.data[2], JSON.stringify('after connect'));
            assert.equal(net.data[4], JSON.stringify('after timeout, before close'));
            assert.equal(net.data[6], JSON.stringify('after close, before connect'));
            assert.equal(net.data[8], JSON.stringify('after close, after connect'));
            assert.equal(net.createConnectionCalled, 2);
        }
    },
    'worker defaults': {
        topic: function() {
            var fakeNet = makeFakeNet(),
                appender = sandbox.require(
                    '../lib/appenders/multiprocess',
                    {
                        requires: {
                            'net': fakeNet
                        }
                    }
                ).appender({ mode: 'worker' });

            return fakeNet;
        },
        'should open a socket to localhost:5000': function(net) {
            assert.equal(net.port, 5000);
            assert.equal(net.host, 'localhost');
        }
    },
    'master': {
        topic: function() {
            var fakeNet = makeFakeNet(),
                appender = sandbox.require(
                    '../lib/appenders/multiprocess',
                    {
                        requires: {
                            'net': fakeNet
                        }
                    }
                ).appender({ mode: 'master',
                             loggerHost: 'server',
                             loggerPort: 1234,
                             actualAppender: fakeNet.fakeAppender.bind(fakeNet)
                           });

            appender('this should be sent to the actual appender directly');

            return fakeNet;
        },
        'should listen for log messages on loggerPort and loggerHost': function(net) {
            assert.equal(net.port, 1234);
            assert.equal(net.host, 'server');
        },
        'should return the underlying appender': function(net) {
            assert.equal(net.logEvents[0], 'this should be sent to the actual appender directly');
        },
        'when a client connects': {
            topic: function(net) {
              var logString = JSON.stringify({ level: { level: 10000, levelStr: 'DEBUG' }, data: ['some debug']}) + '__LOG4JS__';

                net.cbs['data'](JSON.stringify({ level: { level: 40000, levelStr: 'ERROR' }, data: ['an error message'] }) + '__LOG4JS__');
                net.cbs['data'](logString.substring(0, 10));
                net.cbs['data'](logString.substring(10));
                net.cbs['data'](logString + logString + logString);
                net.cbs['end'](JSON.stringify({ level:  { level: 50000, levelStr: 'FATAL' }, data: ["that's all folks"] }) + '__LOG4JS__');
                net.cbs['data']('bad message__LOG4JS__');
                return net;
            },
            'should parse log messages into log events and send to appender': function(net) {
                assert.equal(net.logEvents[1].level.toString(), 'ERROR');
                assert.equal(net.logEvents[1].data[0], 'an error message');
                assert.equal(net.logEvents[1].remoteAddress, '1.2.3.4');
                assert.equal(net.logEvents[1].remotePort, '1234');
            },
            'should parse log messages split into multiple chunks': function(net) {
                assert.equal(net.logEvents[2].level.toString(), 'DEBUG');
                assert.equal(net.logEvents[2].data[0], 'some debug');
                assert.equal(net.logEvents[2].remoteAddress, '1.2.3.4');
                assert.equal(net.logEvents[2].remotePort, '1234');
            },
            'should parse multiple log messages in a single chunk': function(net) {
                assert.equal(net.logEvents[3].data[0], 'some debug');
                assert.equal(net.logEvents[4].data[0], 'some debug');
                assert.equal(net.logEvents[5].data[0], 'some debug');
            },
            'should handle log messages sent as part of end event': function(net) {
                assert.equal(net.logEvents[6].data[0], "that's all folks");
            },
            'should handle unparseable log messages': function(net) {
                assert.equal(net.logEvents[7].level.toString(), 'ERROR');
                assert.equal(net.logEvents[7].categoryName, 'log4js');
                assert.equal(net.logEvents[7].data[0], 'Unable to parse log:');
                assert.equal(net.logEvents[7].data[1], 'bad message');
            }
        }
    },
    'master defaults': {
        topic: function() {
            var fakeNet = makeFakeNet(),
                appender = sandbox.require(
                    '../lib/appenders/multiprocess',
                    {
                        requires: {
                            'net': fakeNet
                        }
                    }
                ).appender({ mode: 'master' });

            return fakeNet;
        },
        'should listen for log messages on localhost:5000': function(net) {
            assert.equal(net.port, 5000);
            assert.equal(net.host, 'localhost');
        }
    }
}).exportTo(module);