<?php

namespace App\Http\Middleware;

use App\Services\Admin\AdminRequestPerformanceMetrics;
use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;
use Psr\Log\LoggerInterface;
use Symfony\Component\HttpFoundation\Response;

class LogSlowAdminRequests
{
    public function __construct(private AdminRequestPerformanceMetrics $metrics) {}

    /**
     * Handle an incoming request.
     *
     * @param  Closure(Request): (Response)  $next
     */
    public function handle(Request $request, Closure $next): Response
    {
        if (! config('admin_performance.slow_requests.enabled', true)) {
            return $next($request);
        }

        $startedAt = microtime(true);
        $this->metrics->start();

        try {
            $response = $next($request);
        } catch (\Throwable $exception) {
            $this->metrics->stop();

            throw $exception;
        }

        $snapshot = $this->metrics->snapshot();
        $this->metrics->stop();

        $durationMs = (int) round((microtime(true) - $startedAt) * 1000);

        if ($this->shouldLog($durationMs, $snapshot['database_time_ms'], $snapshot['query_count'])) {
            $this->logger()->warning('Slow admin request detected.', [
                'method' => $request->method(),
                'path' => '/'.$request->path(),
                'route_name' => $request->route()?->getName(),
                'status_code' => $response->getStatusCode(),
                'user_id' => $request->user()?->id,
                'duration_ms' => $durationMs,
                'database_time_ms' => $snapshot['database_time_ms'],
                'query_count' => $snapshot['query_count'],
                'slow_queries' => $snapshot['slow_queries'],
            ]);
        }

        return $response;
    }

    private function shouldLog(int $durationMs, float $databaseTimeMs, int $queryCount): bool
    {
        return $durationMs >= $this->durationThresholdMs()
            || $databaseTimeMs >= $this->databaseThresholdMs()
            || $queryCount >= $this->queryCountThreshold();
    }

    private function logger(): LoggerInterface
    {
        $channel = config('admin_performance.slow_requests.channel') ?: config('logging.default');

        return Log::channel(is_string($channel) && $channel !== '' ? $channel : 'stack');
    }

    private function durationThresholdMs(): int
    {
        return (int) config('admin_performance.slow_requests.duration_threshold_ms', 750);
    }

    private function databaseThresholdMs(): int
    {
        return (int) config('admin_performance.slow_requests.database_threshold_ms', 250);
    }

    private function queryCountThreshold(): int
    {
        return (int) config('admin_performance.slow_requests.query_count_threshold', 100);
    }
}