<?php require('_mod_security.php'); ?>
<?php
	switch ($_GET['func']):
		case 'load_month' :
			$yr = nz($_GET['year'], '0');
			$mo = nz($_GET['month'], '0');
			$start_date = $yr . '-' . $mo . '-01';
			$sql = "SELECT DAY(start_time_local) AS day_of_month, COUNT(*) as num_events
				FROM events
				WHERE start_time_local >= :start_date AND start_time_local < DATE_ADD(:start_date, INTERVAL 1 MONTH) AND status = 1
				GROUP BY DAYOFMONTH(start_time_local)
				ORDER BY day_of_month
			";
			$stmt = $db->prepare($sql);
			$stmt->execute([
				'start_date' => $start_date,
			]);
			$cal_data = $stmt->fetchAll(PDO::FETCH_ASSOC);
			$cal_data = array_column($cal_data, 'num_events', 'day_of_month');
			$first_day = intval(date('j', strtotime($yr.'-'.$mo.'-1')));
			$first_day_of_week = intval(date('N', strtotime($yr.'-'.$mo.'-2'))); //use 1 for Monday, 2 for Sunday
			$days_in_month = cal_days_in_month(CAL_GREGORIAN, $mo, $yr);
			$html = '';
			$html .= '<table class="grid">';
			$html .= '<tr>';
			for ($i = 0; $i < 7; $i++) : 
				$dow_text = substr(date('l', strtotime('Sunday + '.$i.' days')), 0, 1);  //use Monday or Sunday here
				$html .= '<th><div class="calendar_cell_header">' . $dow_text . '</div></th>';
			endfor;
			$html .= '</tr>';

			$done = false;
			$day = 0;
			$row = 0;
			$day_started = false;
			while (!$done) :
				$html .= '<tr>';
				for ($i = 1; $i <= 7; $i++) :
					$cell_html = '';
					if ($i == $first_day_of_week) :
						$day_started = true;
					endif;
					if ($day_started && $day < $days_in_month) :
						$day++;
						$current_day_style = '';
						if ($yr.'-'.$mo.'-'.$day == date('Y-m-j')) :
							$current_day_style = ' calendar_cell_current ';
						endif;
						$ring_style = '';
						if (($cal_data[$day] ?? 0) > 9) :
							$ring_style = 'calendar_cell_background_4';
						elseif (($cal_data[$day] ?? 0) > 6) :
							$ring_style = 'calendar_cell_background_3';
						elseif (($cal_data[$day] ?? 0) > 3) :
							$ring_style = 'calendar_cell_background_2';
						elseif (($cal_data[$day] ?? 0) > 0) :
							$ring_style = 'calendar_cell_background_1';
						endif;
						if (($cal_data[$day] ?? 0) > 0) :
							$cell_html .= '<div class="calendar_cell '.$ring_style.' '.$current_day_style.'"><a href="events/' . date('Y-m-d', strtotime($yr.'-'.$mo.'-'.$day)) . '/">'.$day.'</a></div>';
						else :
							$cell_html .= '<div class="calendar_cell '.$ring_style.' '.$current_day_style.'">'.$day.'</div>';
						endif;
					endif;
					$html .= '<td>' . $cell_html . '</td>';
				endfor;
				$html .= '</tr>';
				if ($day >= $days_in_month) :
					$done = true;
				endif;
			endwhile;


			$html .= '</table>';
			echo $html;
			return;
			break;
	endswitch;