<?php

declare(strict_types=1);

namespace BattleForge\Http\Handlers;

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

final class GetHomePage
{
    public function __construct(private readonly string $scenariosDir = '')
    {
    }

    /** @param array<string, string> $params */
    public function handle(Request $request, array $params): Response
    {
        $csrf = $request->cookies['__csrf'] ?? '';
        $bundled = $this->loadBundledScenarios();

        ob_start();
        require_once __DIR__ . '/../../Views/layout.php';
        require __DIR__ . '/../../Views/home.php';
        $body = (string) ob_get_clean();

        return Response::html(200, $body);
    }

    /** @return list<array{id: string, name: string, summary: string}> */
    private function loadBundledScenarios(): array
    {
        if ($this->scenariosDir === '' || !is_file($this->scenariosDir . '/manifest.json')) {
            return [];
        }
        $decoded = json_decode((string) file_get_contents($this->scenariosDir . '/manifest.json'), true);
        if (!is_array($decoded)) {
            return [];
        }
        $entries = [];
        foreach ($decoded as $id => $entry) {
            if (!is_string($id) || !preg_match('/^[a-z0-9-]+$/', $id) || !is_array($entry)) {
                continue;
            }
            if (!isset($entry['name'], $entry['summary'])) {
                continue;
            }
            if (!is_file($this->scenariosDir . '/' . $id . '.json')) {
                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 $entries;
    }
}