var vows = require('vows'),
    assert = require('assert'),
    fs = require('fs'),
    DateRollingFileStream = require('../../lib/streams').DateRollingFileStream,
    testTime = new Date(2012, 8, 12, 10, 37, 11);

function cleanUp(filename) {
    return function() {
        fs.unlink(filename);
    };
}

function now() {
    return testTime.getTime();
}

vows.describe('DateRollingFileStream').addBatch({
    'arguments': {
        topic: new DateRollingFileStream(__dirname + '/test-date-rolling-file-stream-1', 'yyyy-mm-dd.hh'),
        teardown: cleanUp(__dirname + '/test-date-rolling-file-stream-1'),

        'should take a filename and a pattern and return a FileWriteStream': function(stream) {
            assert.equal(stream.filename, __dirname + '/test-date-rolling-file-stream-1');
            assert.equal(stream.pattern, 'yyyy-mm-dd.hh');
            assert.instanceOf(stream, fs.FileWriteStream);
        },
        'with default settings for the underlying stream': function(stream) {
            assert.equal(stream.mode, 420);
            assert.equal(stream.flags, 'a');
            assert.equal(stream.encoding, 'utf8');
        }
    },

    'default arguments': {
        topic: new DateRollingFileStream(__dirname + '/test-date-rolling-file-stream-2'),
        teardown: cleanUp(__dirname + '/test-date-rolling-file-stream-2'),

        'pattern should be .yyyy-MM-dd': function(stream) {
            assert.equal(stream.pattern, '.yyyy-MM-dd');
        }
    },

    'with stream arguments': {
        topic: new DateRollingFileStream(__dirname + '/test-date-rolling-file-stream-3', 'yyyy-MM-dd', { mode: 0666 }),
        teardown: cleanUp(__dirname + '/test-date-rolling-file-stream-3'),

        'should pass them to the underlying stream': function(stream) {
            assert.equal(stream.mode, 0666);
        }
    },

    'with stream arguments but no pattern': {
        topic: new DateRollingFileStream(__dirname + '/test-date-rolling-file-stream-4', { mode: 0666 }),
        teardown: cleanUp(__dirname + '/test-date-rolling-file-stream-4'),

        'should pass them to the underlying stream': function(stream) {
            assert.equal(stream.mode, 0666);
        },
        'should use default pattern': function(stream) {
            assert.equal(stream.pattern, '.yyyy-MM-dd');
        }
    },

    'with a pattern of .yyyy-MM-dd': {
        topic: function() {
            var that = this,
                stream = new DateRollingFileStream(__dirname + '/test-date-rolling-file-stream-5', '.yyyy-MM-dd', null, now);
            stream.on("open", function() {
                stream.write("First message\n");
                //wait for the file system to catch up with us
                that.callback(null, stream);
            });
        },
        teardown: cleanUp(__dirname + '/test-date-rolling-file-stream-5'),

        'should create a file with the base name': {
            topic: function(stream) {
                fs.readFile(__dirname + '/test-date-rolling-file-stream-5', this.callback);
            },
            'file should contain first message': function(result) {
                assert.equal(result.toString(), "First message\n");
            }
        },

        'when the day changes': {
            topic: function(stream) {
                testTime = new Date(2012, 8, 13, 0, 10, 12);
                stream.write("Second message\n");
                setTimeout(this.callback, 100);
            },
            teardown: cleanUp(__dirname + '/test-date-rolling-file-stream-5.2012-09-12'),


            'the number of files': {
                topic: function() {
                    fs.readdir(__dirname, this.callback);
                },
                'should be two': function(files) {
                    assert.equal(files.filter(function(file) { return file.indexOf('test-date-rolling-file-stream-5') > -1; }).length, 2);
                }
            },

            'the file without a date': {
                topic: function() {
                    fs.readFile(__dirname + '/test-date-rolling-file-stream-5', this.callback);
                },
                'should contain the second message': function(contents) {
                    assert.equal(contents.toString(), "Second message\n");
                }
            },

            'the file with the date': {
                topic: function() {
                    fs.readFile(__dirname + '/test-date-rolling-file-stream-5.2012-09-12', this.callback);
                },
                'should contain the first message': function(contents) {
                    assert.equal(contents.toString(), "First message\n");
                }
            }
        }
    }

}).exportTo(module);