<?php

declare(strict_types=1);

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;
use Symfony\Component\HttpFoundation\Response;

class ApiResponseCache
{
    private const int DEFAULT_TTL = 60;

    public function handle(Request $request, Closure $next): Response
    {
        if (! $this->shouldCache($request)) {
            return $next($request);
        }

        $cacheKey = $this->generateCacheKey($request);

        if (Cache::has($cacheKey)) {
            $cached = Cache::get($cacheKey);

            if (is_array($cached) && isset($cached['data'], $cached['status'])) {
                return response()->json($cached['data'], $cached['status'], $cached['headers'] ?? []);
            }
        }

        $response = $next($request);

        if ($response->isSuccessful()) {
            $ttl = $this->getTtlFromRoute($request);
            $data = json_decode((string) $response->getContent(), true);

            if (is_array($data)) {
                Cache::put($cacheKey, [
                    'data' => $data,
                    'status' => $response->getStatusCode(),
                ], $ttl);
            }
        }

        return $response;
    }

    private function shouldCache(Request $request): bool
    {
        if (! in_array($request->method(), ['GET', 'HEAD'])) {
            return false;
        }

        if ($request->bearerToken()) {
            return false;
        }

        $cacheableRoutes = [
            '/api/online-users',
            '/api/online-count',
            '/api/radio/current-dj',
            '/api/radio/config',
            '/api/radio/now-playing',
            '/api/radio/listeners',
            '/api/radio/shouts',
            '/api/settings/radio',
            '/api/radio/points/leaderboard',
            '/api/radio/points/stats',
        ];

        return array_any($cacheableRoutes, fn ($route) => str_starts_with($request->path(), ltrim((string) $route, '/')));
    }

    private function generateCacheKey(Request $request): string
    {
        return 'api_cache_' . md5($request->path() . ($request->getQueryString() ?? ''));
    }

    private function getTtlFromRoute(Request $request): int
    {
        $path = $request->path();

        return match (true) {
            str_contains($path, 'online-count') => 30,
            str_contains($path, 'now-playing') => 15,
            str_contains($path, 'current-dj') => 30,
            str_contains($path, 'listeners') => 30,
            str_contains($path, 'leaderboard') => 60,
            str_contains($path, 'shouts') => 30,
            default => self::DEFAULT_TTL,
        };
    }
}