<?php

Prado::using('Application.dto.CalendarGridDayDTO');
Prado::using('Application.dto.GridEventGroupDTO');

class GroupedCalendarGridDayDTO extends CalendarGridDayDTO {

    public function __construct(DateTimeImmutable $date, array $events) {
        parent::__construct($date, $events);
        $this->Events = $this->_getEventGroups($this->Events);
        // initial sort events are going to be re-sorted after assigning grid priorities
        usort($this->Events, ['GridEventGroupDTO', '__compare']);
    }

    private function _getEventGroups(array $events) {
        $clusters = [];
        foreach ($events as $event) {
            if (!isset($clusters[$event->Calendar->ID])) {
                $clusters[$event->Calendar->ID] = [];
            }
            $clusters[$event->Calendar->ID][] = $event;
        }
        return array_map(
            function($cluster) {
                return new GridEventGroupDTO($cluster);
            },
            $clusters
        );
    }

}

?>