<?php

declare(strict_types=1);

namespace BattleForge\Http\Handlers;

use BattleForge\Http\Request;
use BattleForge\Http\Response;

final class GetBundledScenarios
{
    private const FILENAME_PATTERN = '/^[a-z0-9-]+\.json$/';

    public function __construct(private readonly string $scenariosDir)
    {
    }

    /** @param array<string, string> $params */
    public function handle(Request $request, array $params): Response
    {
        $manifestPath = $this->scenariosDir . '/manifest.json';
        $manifest = [];
        if (is_file($manifestPath)) {
            $decoded = json_decode((string) file_get_contents($manifestPath), true);
            if (is_array($decoded)) {
                $manifest = $decoded;
            }
        }

        $entries = [];
        foreach (scandir($this->scenariosDir) ?: [] as $file) {
            if (!preg_match(self::FILENAME_PATTERN, $file)) {
                continue;
            }
            $id = substr($file, 0, -5);
            $entry = $manifest[$id] ?? null;
            if (!is_array($entry) || !isset($entry['name'], $entry['summary'])) {
                continue;
            }
            $entries[] = [
                'id' => $id,
                'name' => (string) $entry['name'],
                'summary' => (string) $entry['summary'],
            ];
        }

        usort($entries, static fn (array $a, array $b): int => strcmp($a['id'], $b['id']));

        return Response::json(200, $entries);
    }
}