(function () {
    "use strict";

    angular.module('shared')

        .service('DaysAgoDateService', ['GenericDateService',
            function(GenericDateService) {

                var dateRanges = {};
                var selectedDateRangeName = "";

                function initDateRanges(mostRecentRollupDate) {
                    var sevenDaysAgo = new Date(mostRecentRollupDate.getTime() - daysToMilliseconds(6));
                    var thirtyDaysAgo = new Date(mostRecentRollupDate.getTime() - daysToMilliseconds(29));
                    var ninetyDaysAgo = new Date(mostRecentRollupDate.getTime() - daysToMilliseconds(89));

                    dateRanges['7'] = {
                        'name' : '7',
                        'displayName' : 'Last 7 days',
                        'start' : sevenDaysAgo,
                        'end' : mostRecentRollupDate
                    };
                    dateRanges['30'] = {
                        'name' : '30',
                        'displayName' : 'Last 30 days',
                        'start' : thirtyDaysAgo,
                        'end' : mostRecentRollupDate
                    };
                    dateRanges['90'] = {
                        'name' : '90',
                        'displayName' : 'Last 90 days',
                        'start' : ninetyDaysAgo,
                        'end' : mostRecentRollupDate
                    };

                    setSelectedDateRange('30');
                }

                function getDateRanges() {
                    return dateRanges;
                }

                function getSelectedDateRange() {
                    return getDateRanges()[selectedDateRangeName];
                }

                function setSelectedDateRange(dateRangeName) {
                    selectedDateRangeName = dateRangeName;
                    var startDate = $j.datepicker.formatDate("mm/dd/yy", dateRanges[dateRangeName].start);
                    var endDate = $j.datepicker.formatDate("mm/dd/yy", dateRanges[dateRangeName].end);
                    GenericDateService.setStartDate(startDate);
                    GenericDateService.setStopDate(endDate);
                }

                function getStartDateString() {
                    var startDate;
                    if (GenericDateService.getStartDate()) {
                        startDate = GenericDateService.getStrippedStartDate(true);
                    }
                    return startDate;
                }

                function getEndDateString() {
                    var endDate;
                    if (GenericDateService.getStopDate()) {
                        endDate = GenericDateService.getStrippedStopDate(true);
                    }
                    return endDate;
                }

                function daysToMilliseconds(days) {
                    return days * 24 * 60 * 60 * 1000;
                }

                function getSelectedDateRangeParamName() {
                    return 'last' + getSelectedDateRange()['name'];
                }

                function getNumDaysBetweenStartDateAndEndDate() {
                    var startDate = new Date(getStartDateString());
                    var endDate = new Date(getEndDateString());
                    var numMillisecondsOneDay = daysToMilliseconds(1);
                    return Math.round((endDate - startDate) / numMillisecondsOneDay);
                }

                return {
                    initDateRanges: initDateRanges,
                    getDateRanges: getDateRanges,
                    setSelectedDateRange: setSelectedDateRange,
                    getSelectedDateRange: getSelectedDateRange,
                    getStartDateString: getStartDateString,
                    getEndDateString: getEndDateString,
                    getSelectedDateRangeParamName: getSelectedDateRangeParamName,
                    getNumDaysBetweenStartDateAndEndDate: getNumDaysBetweenStartDateAndEndDate
                }
            }]);

})();