<?php

declare(strict_types=1);

use App\Framework\LiveComponents\Observability\ComponentMetricsCollector;

describe('ComponentMetricsCollector - Basic Functionality', function () {
    it('can be instantiated', function () {
        $collector = new ComponentMetricsCollector();

        expect($collector)->toBeInstanceOf(ComponentMetricsCollector::class);
    });

    it('starts with empty metrics', function () {
        $collector = new ComponentMetricsCollector();
        $metrics = $collector->getMetrics();

        expect($metrics)->toBeArray();
        expect(count($metrics))->toBe(0);
    });

    it('records render metrics', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordRender('comp-123', 45.5, false);

        $metrics = $collector->getMetrics();
        expect(count($metrics))->toBeGreaterThan(0);
    });

    it('records action execution', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordAction('comp-123', 'handleClick', 25.5, true);

        $metrics = $collector->getMetrics();
        expect(count($metrics))->toBeGreaterThan(0);
    });

    it('records cache hits', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordCacheHit('comp-123', true);

        $metrics = $collector->getMetrics();
        expect(count($metrics))->toBeGreaterThan(0);
    });

    it('records cache misses', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordCacheHit('comp-123', false);

        $metrics = $collector->getMetrics();
        expect(count($metrics))->toBeGreaterThan(0);
    });

    it('records event dispatching', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordEventDispatched('comp-123', 'user:updated');

        $metrics = $collector->getMetrics();
        expect(count($metrics))->toBeGreaterThan(0);
    });

    it('records event receiving', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordEventReceived('comp-123', 'data:loaded');

        $metrics = $collector->getMetrics();
        expect(count($metrics))->toBeGreaterThan(0);
    });

    it('records hydration time', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordHydration('comp-123', 15.5);

        $metrics = $collector->getMetrics();
        expect(count($metrics))->toBeGreaterThan(0);
    });

    it('records batch operations', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordBatch(10, 125.5, 8, 2);

        $metrics = $collector->getMetrics();
        expect(count($metrics))->toBeGreaterThan(0);
    });

    it('records fragment updates', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordFragmentUpdate('comp-123', 3, 45.5);

        $metrics = $collector->getMetrics();
        expect(count($metrics))->toBeGreaterThan(0);
    });

    it('records upload chunks', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordUploadChunk('session-abc', 0, 125.5, true);

        $metrics = $collector->getMetrics();
        expect(count($metrics))->toBeGreaterThan(0);
    });

    it('records upload completion', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordUploadComplete('session-abc', 1500.5, 5);

        $metrics = $collector->getMetrics();
        expect(count($metrics))->toBeGreaterThan(0);
    });

    it('generates summary statistics', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordRender('comp-1', 45.5, false);
        $collector->recordAction('comp-1', 'handleClick', 25.5, true);
        $collector->recordCacheHit('comp-1', true);

        $summary = $collector->getSummary();

        expect($summary)->toBeArray();
        expect(isset($summary['total_renders']))->toBeTrue();
        expect(isset($summary['total_actions']))->toBeTrue();
        expect(isset($summary['cache_hits']))->toBeTrue();
        expect(isset($summary['cache_misses']))->toBeTrue();
        expect(isset($summary['cache_hit_rate']))->toBeTrue();
    });

    it('exports Prometheus format', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordRender('comp-1', 45.5, false);
        $collector->recordAction('comp-1', 'handleClick', 25.5, true);

        $prometheus = $collector->exportPrometheus();

        expect($prometheus)->toBeString();
        expect(str_contains($prometheus, '# HELP'))->toBeTrue();
        expect(str_contains($prometheus, 'livecomponent_'))->toBeTrue();
    });

    it('can reset metrics', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordRender('comp-1', 45.5, false);
        expect(count($collector->getMetrics()))->toBeGreaterThan(0);

        $collector->reset();
        expect(count($collector->getMetrics()))->toBe(0);
    });

    it('calculates cache hit rate correctly', function () {
        $collector = new ComponentMetricsCollector();

        // 2 hits, 1 miss = 66.7% hit rate
        $collector->recordCacheHit('comp-1', true);
        $collector->recordCacheHit('comp-2', true);
        $collector->recordCacheHit('comp-3', false);

        $summary = $collector->getSummary();

        expect($summary['cache_hits'])->toBe(2);
        expect($summary['cache_misses'])->toBe(1);
        expect($summary['cache_hit_rate'])->toBeGreaterThan(60.0);
        expect($summary['cache_hit_rate'])->toBeLessThan(70.0);
    });

    it('handles action errors separately', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordAction('comp-1', 'handleClick', 25.5, false);

        $summary = $collector->getSummary();

        expect($summary['action_errors'])->toBe(1);
    });

    it('tracks multiple components', function () {
        $collector = new ComponentMetricsCollector();

        $collector->recordRender('comp-1', 45.5, false);
        $collector->recordRender('comp-2', 30.2, true);
        $collector->recordAction('comp-1', 'handleClick', 25.5, true);
        $collector->recordAction('comp-2', 'handleSubmit', 35.8, true);

        $summary = $collector->getSummary();

        expect($summary['total_renders'])->toBe(2);
        expect($summary['total_actions'])->toBe(2);
    });

    it('handles zero operations gracefully', function () {
        $collector = new ComponentMetricsCollector();

        $summary = $collector->getSummary();

        expect($summary['total_renders'])->toBe(0);
        expect($summary['total_actions'])->toBe(0);
        expect($summary['cache_hit_rate'])->toBe(0.0);
    });
});