FressRSS/app/views/stats/index.phtml

<?php
	declare(strict_types=1);
	/** @var FreshRSS_ViewStats $this */
	$this->partial('aside_subscription');
?>
<main class="post">
	<div class="link-back-wrapper">
		<a class="link-back" href="<?= _url('index', 'index') ?>"><?= _t('gen.action.back_to_rss_feeds') ?></a>
	</div>

	<h1><?= _t('admin.stats.main') ?></h1>

	<div class="stat-grid">
		<div class="stat half">
			<h2><?= _t('admin.stats.entry_repartition') ?></h2>
			<div class="table-wrapper scrollbar-thin">
				<table>
					<thead>
						<tr>
							<th> </th>
							<th><?= _t('admin.stats.main_stream') ?></th>
							<th><?= _t('admin.stats.all_feeds') ?></th>
						</tr>
					</thead>
					<tbody>
						<tr>
							<th><?= _t('admin.stats.status_total') ?></th>
							<td class="numeric"><?= format_number($this->repartitions['main_stream']['total'] ?? -1) ?></td>
							<td class="numeric"><?= format_number($this->repartitions['all_feeds']['total'] ?? -1) ?></td>
						</tr>
						<tr>
							<th><?= _t('admin.stats.status_read') ?></th>
							<td class="numeric"><?= format_number($this->repartitions['main_stream']['count_reads'] ?? -1) ?></td>
							<td class="numeric"><?= format_number($this->repartitions['all_feeds']['count_reads'] ?? -1) ?></td>
						</tr>
						<tr>
							<th><?= _t('admin.stats.status_unread') ?></th>
							<td class="numeric"><?= format_number($this->repartitions['main_stream']['count_unreads'] ?? -1) ?></td>
							<td class="numeric"><?= format_number($this->repartitions['all_feeds']['count_unreads'] ?? -1) ?></td>
						</tr>
						<tr>
							<th><?= _t('admin.stats.status_favorites') ?></th>
							<td class="numeric"><?= format_number($this->repartitions['main_stream']['count_favorites'] ?? -1) ?></td>
							<td class="numeric"><?= format_number($this->repartitions['all_feeds']['count_favorites'] ?? -1) ?></td>
						</tr>
					</tbody>
				</table>
			</div>
		</div>

		<div class="stat half">
			<h2><?= _t('admin.stats.top_feed') ?></h2>
			<div class="table-wrapper scrollbar-thin">
				<table>
					<thead>
						<tr>
							<th><?= _t('admin.stats.feed') ?></th>
							<th><?= _t('admin.stats.category') ?></th>
							<th><?= _t('admin.stats.entry_count') ?></th>
							<th><?= _t('admin.stats.percent_of_total') ?></th>
						</tr>
					</thead>
					<tbody>
						<?php foreach ($this->topFeed as $feed): ?>
							<tr>
								<td><a href="<?= _url('stats', 'repartition', 'id', $feed['id']) ?>"><?= $feed['name'] ?></a></td>
								<td><?= $feed['category'] ?></td>
								<td class="numeric"><?= format_number($feed['count']) ?></td>
								<td class="numeric"><?php
									if (!empty($this->repartitions['all_feeds']['total'])) {
										echo format_number($feed['count'] / $this->repartitions['all_feeds']['total'] * 100, 1);
									}
								?></td>
							</tr>
						<?php endforeach; ?>
					</tbody>
				</table>
			</div>
		</div>

		<div class="stat">
			<h2><?= _t('admin.stats.entry_per_day') ?></h2>
			<div>
				<canvas id="statsEntriesPerDay"></canvas>
				<script class="jsonData-stats" type="application/json">
				<?= json_encode([
					'canvasID' 		=> 'statsEntriesPerDay',
					'charttype' 	=> 'barWithAverage',
					'labelBarChart' => _t('admin.stats.entry_count'),
					'dataBarChart' 	=> $this->entryCount,
					'labelAverage' 	=> 'Average (' . $this->average . ')',
					'dataAverage' 	=> $this->average,
					'xAxisLabels' 	=> $this->last30DaysLabels,
				], JSON_UNESCAPED_UNICODE)
				?></script>
			</div>
		</div>

<?php
// Function to generate a color palette
/**
 * Generate a color palette.
 *
 * @param int $count The number of colors to generate.
 * @return array<int, string> An array of HSL color strings.
 */
function generateColorPalette(int $count): array {
	$colors = [];
	for ($i = 0; $i < $count; $i++) {
		$hue = ($i / $count) * 360; // Distribute colors evenly around the color wheel
		$saturation = 70; // Fixed saturation
		$lightness = 50; // Fixed lightness
		$colors[] = "hsl($hue, {$saturation}%, {$lightness}%)";
	}
	return $colors;
}

// 1. Get all unique category labels and sort them
$allLabels = array_unique(array_merge($this->feedByCategory['label'], $this->entryByCategory['label']));
sort($allLabels); // Ensure consistent order

// 2. Generate a color palette based on the number of unique categories
$colorPalette = generateColorPalette(count($allLabels));

// 3. Map categories to colors
$colorMap = array_combine($allLabels, $colorPalette);

// 4. Align data and labels for both charts
$feedData = array_fill_keys($allLabels, 0); // Initialize data with all categories
foreach ($this->feedByCategory['label'] as $index => $label) {
	$feedData[$label] = $this->feedByCategory['data'][$index];
}
$entryData = array_fill_keys($allLabels, 0); // Initialize data with all categories
foreach ($this->entryByCategory['label'] as $index => $label) {
	$entryData[$label] = $this->entryByCategory['data'][$index];
}

// Final data and labels
$feedLabels = array_keys($feedData);
$feedColors = array_map(fn($label) => $colorMap[$label], $feedLabels);
$feedValues = array_values($feedData);

$entryLabels = array_keys($entryData);
$entryColors = array_map(fn($label) => $colorMap[$label], $entryLabels);
$entryValues = array_values($entryData);
?>

		<div class="stat half">
			<h2><?= _t('admin.stats.feed_per_category') ?></h2>
			<div>
				<canvas id="statsFeedsPerCategory"></canvas>
				<script class="jsonData-stats" type="application/json">
				<?= json_encode([
						'canvasID' => 'statsFeedsPerCategory',
						'charttype' => 'doughnut',
						'data' => $feedValues,
						'labels' => $feedLabels,
						'backgroundColor' => $feedColors,
					], JSON_UNESCAPED_UNICODE); ?>
				</script>
			</div>
		</div>

		<div class="stat half">
			<h2><?= _t('admin.stats.entry_per_category') ?></h2>
			<div>
				<canvas id="statsEntriesPerCategory"></canvas>
				<script class="jsonData-stats" type="application/json">
				<?= json_encode([
						'canvasID' => 'statsEntriesPerCategory',
						'charttype' => 'doughnut',
						'data' => $entryValues,
						'labels' => $entryLabels,
						'backgroundColor' => $entryColors,
					], JSON_UNESCAPED_UNICODE); ?>
				</script>
			</div>
		</div>

	</div>
</main>

<script src="../scripts/statsWithChartjs.js?<?= @filemtime(PUBLIC_PATH . '/scripts/statsWithChartjs.js') ?>"></script>