<?php

declare(strict_types=1);

namespace App\Framework\Metrics;

/**
 * Immutable registry of Counter value objects
 * Framework-internal counters without Prometheus overhead
 */
final readonly class FrameworkCounters
{
    /**
     * @param array<string, Counter> $counters
     */
    public function __construct(
        private array $counters = []
    ) {
    }

    public function get(string $name): Counter
    {
        return $this->counters[$name] ?? new Counter($name, 0);
    }

    public function increment(string $name, int $by = 1): self
    {
        $current = $this->get($name);
        $updated = $current->increment($by);

        return new self([
            ...$this->counters,
            $name => $updated,
        ]);
    }

    public function reset(string $name): self
    {
        $current = $this->get($name);
        $updated = $current->reset();

        return new self([
            ...$this->counters,
            $name => $updated,
        ]);
    }

    public function resetAll(): self
    {
        return new self([]);
    }

    /**
     * Get all counters
     * @return array<string, Counter>
     */
    public function all(): array
    {
        return $this->counters;
    }

    /**
     * Convert to simple array for serialization
     * @return array<string, int>
     */
    public function toArray(): array
    {
        return array_map(
            fn (Counter $counter) => $counter->value,
            $this->counters
        );
    }

    /**
     * Export counters as MetricsCollection for Prometheus compatibility
     */
    public function toMetricsCollection(): MetricsCollection
    {
        $collection = new MetricsCollection();

        foreach ($this->counters as $counter) {
            $collection->counter(
                name: "framework_{$counter->name}",
                value: (float) $counter->value,
                help: "Framework internal counter: {$counter->name}",
                labels: ['type' => 'internal']
            );
        }

        return $collection;
    }
}