<?php

namespace App\Services\Link;

/**
 * In-memory counter store for tests and for local development without Redis.
 * Process-local, so it is never appropriate in production.
 */
class ArrayClickCounterStore implements ClickCounterStore
{
    /** @var array<string, array<string, string>> */
    private array $hashes = [];

    public function increment(string $hash, string $field, int $by = 1): void
    {
        $this->hashes[$hash][$field] = (string) (((int) ($this->hashes[$hash][$field] ?? 0)) + $by);
    }

    public function put(string $hash, string $field, string $value): void
    {
        $this->hashes[$hash][$field] = $value;
    }

    /** @return array<string, string> */
    public function drain(string $hash): array
    {
        $out = $this->hashes[$hash] ?? [];
        unset($this->hashes[$hash]);

        return $out;
    }
}