Timerange Filter Form

<?php

namespace ErstiesAdmin\Forms;

class TimerangeFilterForm extends \CMS\FilterForm {
    public function __construct() {
        parent::__construct('get');

        $end = new \DateTime();
        $start = clone($end);
        $start->modify('-1 week');

        $_GET['start'] = @$_GET['start'] ?: $start->format("d.m.Y");
        $_GET['end'] = @$_GET['end'] ?: $end->format("d.m.Y");

        $this
            ->fieldset()
            ->select('range', _t('Range'), [
                _t('Last Week')     => 'last_week',
                _t('Last Month')    => 'last_month',
                _t('Last Year')     => 'last_year',
                _t('Select Week')   => 'week',
                _t('Select Month')  => 'month',
                _t('Select Year')   => 'year',
                _t('Free Select')   => 'free'
            ], '', false, [
                'id' => 'events_chart_range_type',
            ])
            ->select('week', _t('Select week'), $this->getWeekOptions(15), '', false, [
                'class' => 'chart_select chart_select-week',
            ])
            ->select('month', _t('Select month'), $this->getMonthOptions(12), '', false, [
                'class' => 'chart_select chart_select-month',
            ])
            ->select('year', _t('Select year'), $this->getYearOptions(5), '', false, [
                'class' => 'chart_select chart_select-year',
            ])
            ->text_date('start', _t('Start'), '', $start, [
                'class' => 'chart_select chart_select-free',
            ])
            ->text_date('end', _t('End'), '', $end, [
                'class' => 'chart_select chart_select-free',
            ])
            ->select('step', _t('Step'), [
                _t('Day')    => 'day',
                _t('Week')   => 'week',
                _t('Month')  => 'month',
                _t('Year')   => 'year',
            ], '');
    }

    public function validate() {
        if (parent::validate()) {
            $range = $this->values['range'];

            switch ($range) {
                case 'last_week':
                    $end = new \DateTime();
                    $start = clone($end);
                    $start->modify('-1 week');
                    break;

                case 'last_month':
                    $end = new \DateTime();
                    $start = clone($end);
                    $start->modify('-1 month');
                    break;

                case 'last_year':
                    $end = new \DateTime();
                    $start = clone($end);
                    $start->modify('-1 year');
                    break;

                case 'week':
                case 'month':
                case 'year':
                        $arr = explode('-', $this->values[$range]);
                        $start = new \DateTime($arr[0]);
                        $end = new \DateTime($arr[1]);
                break;

                case 'free':
                default:
                    $start = $this->values['start'] ?: $this->start;
                    $end = $this->values['end'] ?: $this->end;
                    break;
            }

            $start = \Ersties\DateTimeHelper::roundDownTimeToStep($start, $this->values['step']);
            $end = \Ersties\DateTimeHelper::roundUpTimeToStep($end, $this->values['step']);

            $this->values['start'] = $start;
            $this->values['end'] = $end;

            return true;
        }

        return false;
    }

    public function getChartBlankData($emptyItemData = 0) {

        $daterange = $this->getDatePeriod();

        $emptyChartData = [];
        foreach($daterange as $datetime) {
            $datetime->setTime(0, 0, 0);
            $emptyChartData[($datetime->getTimestamp() + $datetime->getOffset()) * 1000] = $emptyItemData;
        }
        ksort($emptyChartData);

        return $emptyChartData;
    }

    private function getWeekOptions($count) {
        $latestWeeks = [];
        $dateTo = new \DateTime();
        $dateTo->setTime(0, 0, 0);
        $dateTo = \Ersties\DateTimeHelper::getWeekFirstDay($dateTo);
        $dateFrom = clone($dateTo);
        $dateFrom->modify("-$count weeks");
        $dateTo->setTime(23, 59, 59);

        $daterange = new \DatePeriod($dateFrom, new \DateInterval('P7D'), $dateTo);
        foreach ($daterange as $date) {
            $date2 = clone $date;
            $date2 = \Ersties\DateTimeHelper::getWeekLastDay($date2);
            $date2->setTime(23, 59, 59);
            $latestWeeks[$date->format('d F Y') . ' - ' . $date2->format('d F Y')] = $date->format('d.m.Y') . '-' . $date2->format('d.m.Y');
        }

        return array_reverse($latestWeeks, true);
    }

    private function getMonthOptions($count) {
        $latestMonths = [];
        $dateTo = new \DateTime();
        $dateTo->setTime(0, 0, 0);
        $dateTo = \Ersties\DateTimeHelper::getMonthFirstDay($dateTo);
        $dateFrom = clone($dateTo);
        $dateFrom->modify("-$count months");
        $dateTo->setTime(23, 59, 59);

        $daterange = new \DatePeriod($dateFrom, new \DateInterval('P1M'), $dateTo);
        foreach ($daterange as $date) {
            $date2 = clone $date;
            $date2 = \Ersties\DateTimeHelper::getMonthLastDay($date2);
            $date2->setTime(23, 59, 59);
            $latestMonths[$date->format('F Y')] = $date->format('d.m.Y') . '-' . $date2->format('d.m.Y');
        }

        return array_reverse($latestMonths, true);
    }

    private function getYearOptions($count) {
        $latestMonths = [];
        $dateTo = new \DateTime();
        $dateTo->setTime(0, 0, 0);
        $dateTo = \Ersties\DateTimeHelper::getYearFirstDay($dateTo);
        $dateFrom = clone($dateTo);
        $dateFrom->modify("-$count years");
        $dateTo->setTime(23, 59, 59);

        $daterange = new \DatePeriod($dateFrom, new \DateInterval('P1Y'), $dateTo);
        foreach ($daterange as $date) {
            $date2 = clone $date;
            $date2 = \Ersties\DateTimeHelper::getYearLastDay($date2);
            $date2->setTime(23, 59, 59);
            $latestMonths[$date->format('Y')] = $date->format('d.m.Y') . '-' . $date2->format('d.m.Y');
        }

        return array_reverse($latestMonths, true);
    }

    public function getDatePeriod() {
        switch($this->values['step']) {
            case 'week':
                $dateInterval = new \DateInterval('P7D');
                break;
            case 'month':
                $dateInterval = new \DateInterval('P1M');
                break;
            case 'year':
                $dateInterval = new \DateInterval('P1Y');
                break;
            case 'day':
                $dateInterval = new \DateInterval('P1D');
                break;
            default:
                $dateInterval = new \DateInterval('P1D');
                break;
        }

        return new \DatePeriod($this->values['start'], $dateInterval, $this->values['end']);
    }
}