(function (angular, moment) {
    'use strict';

    var namespacePrefix = 'moment',
        moduleName = 'angular-moment',
        momentModule = angular.module(moduleName, []),
        utilsModule = angular.module(moduleName + '/utils', []),
        filtersModule = angular.module(moduleName + '/filters', []);

    /**
     *
     * @param {String} input
     * @returns {String}
     */
    function capitalize (input) {
        return input.charAt(0).toUpperCase() + input.slice(1);
    }

    momentModule.filter("moment", function () {
        return function (input) {
            return moment(input);
        };
    });

    var filterFactory = function (name) {
        momentModule.filter(namespacePrefix + capitalize(name), function () {

            return function (input, arg) {
                if(!moment(input).isValid()) { return input; }

                var tmp;
                switch (name) {
                    case 'daysInMonth':
                        tmp = moment(input, "YYYY-MM");
                        break;
                    case 'endOf':
                        return moment().endOf(input);

                    case 'zone':
                        return moment(input).zone(arg + "");

                    case 'interval': // input in seconds.. returns a readable interval
                        return moment(parseInt(moment().format('X')) + input, 'X').fromNow(true);

                    default:
                        tmp = moment(input);
                }
                return tmp[name].apply(tmp, Array.prototype.slice.call(arguments, 1));
            };
        });
    };

    var filters = [
        "add",
        "calendar",
        "day",
        "dayOfYear",
        "days",
        "daysInMonth",
        "diff",
        "endOf",
        "format",
        "from",
        "fromNow",
        "get",
        "hour",
        "hours",
        "interval",
        "invalidAt",
        "isAfter",
        "isBefore",
        "isDST",
        "isDSTShifted",
        "isLeapYear",
        "isSame",
        "isValid",
        "isoWeek",
        "isoWeekYear",
        "isoWeekday",
        "isoWeeks",
        "isoWeeksInYear",
        "lang",
        "local",
        "max",
        "millisecond",
        "milliseconds",
        "min",
        "minute",
        "minutes",
        "month",
        "months",
        "parseZone",
        "parsingFlags",
        "quarter",
        "quarters",
        "second",
        "seconds",
        "set",
        "startOf",
        "subtract",
        "toArray",
        "toDate",
        "toISOString",
        "toJSON",
        "toString",
        "tz",
        "unix",
        "utc",
        "valueOf",
        "week",
        "weekYear",
        "weekday",
        "weeks",
        "weeksInYear",
        "year",
        "years",
        "zone",
        "zoneAbbr",
        "zoneName"
    ];

    angular.forEach(filters, function (filterName) {
        filterFactory(filterName);
    });

    momentModule.directive('momentInterval', function ($interval, $compile) {

        return function (scope, element, attrs) {
            var stopTime; // so that we can cancel the time updates
            var time = attrs.momentInterval ? parseInt(attrs.momentInterval, 10) : 1000;

            // used to update the UI
            function reCompile () {
                $compile(element)(scope);
            }

            stopTime = $interval(reCompile, time);

            // listen on DOM destroy (removal) event, and cancel the next UI update
            // to prevent updating time ofter the DOM element was removed.
            element.on('$destroy', function () {
                $interval.cancel(stopTime);
            });
        };
    });

    momentModule.factory("angularMoment", function () {
        return moment;
    });

}(angular, moment));