<?php

function updateFixture(string $original, array $manifest, bool $native = false): string
{
    $root = sys_get_temp_dir().'/sgf-update-'.bin2hex(random_bytes(6));
    mkdir($root, 0700);
    $copy = function (string $from, string $to, bool $links = false) use (&$copy) {
        if (! is_dir($to)) {
            mkdir($to, 0700, true);
        }
        foreach (new DirectoryIterator($from) as $file) {
            if ($file->isDot() || $file->isLink() || str_starts_with($file->getFilename(), '.')) {
                continue;
            }
            $target = $to.'/'.$file->getFilename();
            if ($file->isDir()) {
                $copy($file->getPathname(), $target, $links);
            } elseif (! $links || ! link($file->getPathname(), $target)) {
                copy($file->getPathname(), $target);
            }
        }
    };
    if ($native) {
        foreach (['app', 'config', 'routes', 'packages', 'resources', 'public'] as $directory) {
            $copy($original.'/'.$directory, $root.'/'.$directory);
        }
        $old = json_decode(file_get_contents(dirname(__DIR__, 2).'/docs/proofs/sgf-composition-delivery.json'), true, 32, JSON_THROW_ON_ERROR)['clone'];
        $old = realpath($old) ?: '';
        $temp = str_replace('\\', '/', realpath(sys_get_temp_dir()));
        $normal = str_replace('\\', '/', $old);
        $private = str_starts_with(strtolower($normal), strtolower($temp).'/sgf-composition-') && preg_match('/^sgf-composition-[a-f0-9]{12}$/D', basename($old));
        // Hardlinks only to an earlier disposable dependency copy, never to the actual destination.
        $copy(($private && is_dir($old.'/vendor')) ? $old.'/vendor' : $original.'/vendor', $root.'/vendor', $private);
        mkdir($root.'/bootstrap/cache', 0700, true);
        foreach (['app.php', 'providers.php'] as $file) {
            copy($original.'/bootstrap/'.$file, $root.'/bootstrap/'.$file);
        }
        copy($original.'/composer.json', $root.'/composer.json');
        copy($original.'/artisan', $root.'/artisan');
        if (!is_dir($root.'/public')) mkdir($root.'/public', 0700, true);
        copy($original.'/public/index.php', $root.'/public/index.php');
    } else {
        foreach ($manifest['host_overlays'] as $file => $values) {
            if (! is_dir(dirname($root.'/'.$file))) {
                mkdir(dirname($root.'/'.$file), 0700, true);
            }copy($original.'/'.$file, $root.'/'.$file);
        }
    }
    // Frontend overlays are existing host files too; preserve their exact baseline
    // in native copies without sharing mutable assets with the real destination.
    foreach ($manifest['host_overlays'] as $file => $values) {
        if (!is_file($root.'/'.$file)) {
            if (!is_dir(dirname($root.'/'.$file))) mkdir(dirname($root.'/'.$file),0700,true);
            copy($original.'/'.$file,$root.'/'.$file);
        }
    }
    foreach (['bootstrap/cache', 'packages/purchasing', 'storage/framework/views', 'storage/framework/cache', 'storage/framework/sessions', 'storage/logs'] as $directory) {
        if (! is_dir($root.'/'.$directory)) {
            mkdir($root.'/'.$directory, 0700, true);
        }
    }
    copy($original.'/packages/purchasing/current.json',$root.'/packages/purchasing/current.json');
    file_put_contents($root.'/storage/framework/down','{"status":503}');

    return $root;
}