<?php

namespace App\Services\Admin;

use Illuminate\Database\Events\QueryExecuted;

class AdminRequestPerformanceMetrics
{
    private bool $active = false;

    private int $queryCount = 0;

    private float $databaseTimeMs = 0.0;

    /**
     * @var list<array{sql: string, time_ms: float, connection: ?string}>
     */
    private array $slowQueries = [];

    public function start(): void
    {
        $this->active = true;
        $this->queryCount = 0;
        $this->databaseTimeMs = 0.0;
        $this->slowQueries = [];
    }

    /**
     * @return array{database_time_ms: float, query_count: int, slow_queries: list<array{sql: string, time_ms: float, connection: ?string}>}
     */
    public function snapshot(): array
    {
        return [
            'database_time_ms' => round($this->databaseTimeMs, 2),
            'query_count' => $this->queryCount,
            'slow_queries' => $this->slowQueries,
        ];
    }

    public function stop(): void
    {
        $this->active = false;
    }

    public function record(QueryExecuted $query): void
    {
        if (! $this->active) {
            return;
        }

        $this->queryCount++;
        $this->databaseTimeMs += $query->time;

        if ($query->time < $this->slowQueryThresholdMs()) {
            return;
        }

        if (count($this->slowQueries) >= $this->maxSlowQueries()) {
            return;
        }

        $this->slowQueries[] = [
            'sql' => $query->sql,
            'time_ms' => round($query->time, 2),
            'connection' => $query->connectionName,
        ];
    }

    private function slowQueryThresholdMs(): int
    {
        return (int) config('admin_performance.slow_requests.slow_query_threshold_ms', 50);
    }

    private function maxSlowQueries(): int
    {
        return max(0, (int) config('admin_performance.slow_requests.max_slow_queries', 5));
    }
}