<?php

declare(strict_types=1);

namespace Tests\Unit\Framework\Logging;

use App\Framework\Logging\LogLevel;
use App\Framework\Logging\Metrics\LogMetricsCollector;
use PHPUnit\Framework\TestCase;

final class MetricsCollectorTest extends TestCase
{
    protected function tearDown(): void
    {
        LogMetricsCollector::resetInstance();
    }

    public function test_tracks_log_counts(): void
    {
        $collector = LogMetricsCollector::getInstance();

        $collector->recordLog(LogLevel::INFO, 'app');
        $collector->recordLog(LogLevel::ERROR, 'app');
        $collector->recordLog(LogLevel::ERROR, 'api');

        $metrics = $collector->getMetrics();

        $this->assertEquals(3, $metrics->getTotalLogs());
        $this->assertEquals(2, $metrics->getErrorCount());
    }

    public function test_calculates_error_rate(): void
    {
        $collector = LogMetricsCollector::getInstance();

        $collector->recordLog(LogLevel::INFO, 'app');
        $collector->recordLog(LogLevel::INFO, 'app');
        $collector->recordLog(LogLevel::ERROR, 'app');

        $metrics = $collector->getMetrics();

        $this->assertEquals(1 / 3, $metrics->getErrorRate());
    }

    public function test_tracks_by_level(): void
    {
        $collector = LogMetricsCollector::getInstance();

        $collector->recordLog(LogLevel::INFO, 'app');
        $collector->recordLog(LogLevel::INFO, 'app');
        $collector->recordLog(LogLevel::ERROR, 'app');

        $metrics = $collector->getMetrics();
        $byLevel = $metrics->getCountsByLevel();

        $this->assertEquals(2, $byLevel['INFO']);
        $this->assertEquals(1, $byLevel['ERROR']);
    }

    public function test_tracks_by_channel(): void
    {
        $collector = LogMetricsCollector::getInstance();

        $collector->recordLog(LogLevel::INFO, 'app');
        $collector->recordLog(LogLevel::INFO, 'api');
        $collector->recordLog(LogLevel::INFO, 'api');

        $metrics = $collector->getMetrics();
        $byChannel = $metrics->getCountsByChannel();

        $this->assertEquals(1, $byChannel['app']);
        $this->assertEquals(2, $byChannel['api']);
    }

    public function test_resets_metrics(): void
    {
        $collector = LogMetricsCollector::getInstance();

        $collector->recordLog(LogLevel::INFO, 'app');
        $collector->reset();

        $metrics = $collector->getMetrics();

        $this->assertEquals(0, $metrics->getTotalLogs());
    }

    public function test_provides_summary(): void
    {
        $collector = LogMetricsCollector::getInstance();

        $collector->recordLog(LogLevel::INFO, 'app');
        $collector->recordLog(LogLevel::ERROR, 'app');

        $summary = $collector->getSummary();

        $this->assertArrayHasKey('total', $summary);
        $this->assertArrayHasKey('errors', $summary);
        $this->assertArrayHasKey('error_rate', $summary);
        $this->assertArrayHasKey('uptime_seconds', $summary);
        $this->assertArrayHasKey('logs_per_second', $summary);
    }
}