<?php
declare(strict_types=1);

header('Content-Type: application/json; charset=utf-8');
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');

$service = 'financial';
$root = dirname(__DIR__);
$scanRoots = [
    'app' => ['php'],
    'public' => ['php', 'html', 'js', 'css', 'webmanifest', 'png', 'ico'],
];

function collect_asset_files(string $root, array $scanRoots): array
{
    $files = [];
    $rootPath = realpath($root);
    if (!$rootPath) {
        return $files;
    }

    foreach ($scanRoots as $relativeRoot => $extensions) {
        $base = realpath($rootPath . DIRECTORY_SEPARATOR . $relativeRoot);
        if (!$base || strpos($base, $rootPath . DIRECTORY_SEPARATOR) !== 0) {
            continue;
        }

        $allowed = array_fill_keys(array_map('strtolower', $extensions), true);
        $iterator = new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator($base, FilesystemIterator::SKIP_DOTS)
        );

        foreach ($iterator as $file) {
            if (!$file instanceof SplFileInfo || !$file->isFile()) {
                continue;
            }

            $extension = strtolower($file->getExtension());
            if (!isset($allowed[$extension])) {
                continue;
            }

            $path = $file->getRealPath();
            if ($path && strpos($path, $rootPath . DIRECTORY_SEPARATOR) === 0) {
                $files[] = $path;
            }
        }
    }

    sort($files, SORT_STRING);
    return array_values(array_unique($files));
}

clearstatcache();
$rootPath = realpath($root);
$fingerprints = [];
$assets = [];

foreach (collect_asset_files($root, $scanRoots) as $fullPath) {
    $relativePath = ltrim(str_replace($rootPath ?: $root, '', $fullPath), DIRECTORY_SEPARATOR);
    $fileHash = is_readable($fullPath) ? (hash_file('sha256', $fullPath) ?: 'hash-failed') : 'unreadable';
    $fileVersion = (string)filemtime($fullPath) . '-' . substr($fileHash, 0, 10);
    $fingerprints[] = implode('|', [
        str_replace(DIRECTORY_SEPARATOR, '/', $relativePath),
        (string)filesize($fullPath),
        (string)filemtime($fullPath),
        $fileHash,
    ]);

    if (str_starts_with($relativePath, 'public' . DIRECTORY_SEPARATOR)) {
        $publicPath = substr($relativePath, strlen('public'));
        $assets[str_replace(DIRECTORY_SEPARATOR, '/', $publicPath)] = $fileVersion;
    }
}

echo json_encode([
    'result' => 'ok',
    'service' => $service,
    'version' => hash('sha256', implode("\n", $fingerprints)),
    'assets' => $assets,
    'count' => count($fingerprints),
    'generatedAt' => time(),
], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);