<?php
header('Content-Type: application/json');

$dir = __DIR__;
$files = array_diff(scandir($dir), ['.', '..', 'list.php']);

function parseFrontMatter($raw) {
    if (preg_match('/^---\r?\n(.+?)\r?\n---\r?\n(.*)$/s', $raw, $m)) {
        $meta = [];
        foreach (preg_split('/\r?\n/', $m[1]) as $line) {
            if (strpos($line, ':') === false) continue;
            [$key, $value] = explode(':', $line, 2);
            $meta[trim($key)] = trim($value, " \t\"'");
        }
        return $meta;
    }
    return [];
}

$posts = [];
foreach ($files as $file) {
    $ext = strtolower(pathinfo($file, PATHINFO_EXTENSION));
    if (!in_array($ext, ['html', 'md'])) continue;

    $path = $dir . '/' . $file;
    $fallbackTitle = ucwords(str_replace(['-', '_'], ' ', pathinfo($file, PATHINFO_FILENAME)));
    $created = filectime($path); // fallback if no front matter date

    $meta = [];
    if ($ext === 'md') {
        $raw = file_get_contents($path, false, null, 0, 4096); // just need the header
        $meta = parseFrontMatter($raw);
    }

    $title = $meta['title'] ?? $fallbackTitle;
    $date  = isset($meta['date']) ? strtotime($meta['date']) : $created;

    $posts[] = [
        'file'    => $file,
        'title'   => $title,
        'type'    => $ext,
        'created' => $date ?: $created,
    ];
}

usort($posts, fn($a, $b) => $b['created'] - $a['created']); // newest first

echo json_encode($posts);