<?php
header('Content-Type: application/json; charset=UTF-8');
header('Cache-Control: no-store');

function mvlog_load_push_config_for_public_key(string $mvlogRoot): ?array {
    $candidates = [
        '/etc/mvlog/push.php',
        '/etc/mvlog/push.json',
        $mvlogRoot . '/push.json',
        (getenv('HOME') !== false ? getenv('HOME') . '/.config/mvlog/push.json' : null),
    ];

    foreach ($candidates as $candidate) {
        if (!$candidate || !is_file($candidate) || !is_readable($candidate)) continue;

        $cfg = null;
        if (str_ends_with($candidate, '.php')) {
            $loaded = @require $candidate;
            if (is_array($loaded)) $cfg = $loaded;
        } else {
            $decoded = json_decode((string)@file_get_contents($candidate), true);
            if (is_array($decoded)) $cfg = $decoded;
        }

        if (!is_array($cfg)) continue;

        $public = (string)($cfg['public_key'] ?? $cfg['vapidPublicKey'] ?? '');
        $private = (string)($cfg['private_key'] ?? $cfg['vapidPrivateKey'] ?? '');
        $subject = (string)($cfg['subject'] ?? $cfg['vapidSubject'] ?? '');

        if ($public !== '' && $private !== '') {
            return [
                'public_key' => $public,
                'private_key' => $private,
                'subject' => $subject,
                '_source' => $candidate,
            ];
        }
    }

    return null;
}

$cfg = mvlog_load_push_config_for_public_key(__DIR__);
if (!$cfg) {
    echo json_encode(['enabled' => false]);
    exit;
}

echo json_encode([
    'enabled' => true,
    'publicKey' => (string)$cfg['public_key'],
], JSON_UNESCAPED_SLASHES);