<?php
declare(strict_types=1);

final class RepeatState
{
    public function __construct(private string $baseDir = Settings::STATE_DIR, private ?int $now = null)
    {
    }

    public function shouldSend(string $owner, string $ruleId, string $recipient, string $sender, int $repeatMinutes): bool
    {
        if ($repeatMinutes <= 0) {
            return true;
        }
        $path = $this->path($owner, $ruleId, $recipient, $sender);
        if (!is_file($path)) {
            return true;
        }
        $data = json_decode((string)file_get_contents($path), true);
        $last = is_array($data) ? (int)($data['last_sent_at'] ?? 0) : 0;
        return ($this->time() - $last) >= ($repeatMinutes * 60);
    }

    public function record(string $owner, string $ruleId, string $recipient, string $sender): void
    {
        $path = $this->path($owner, $ruleId, $recipient, $sender);
        $dir = dirname($path);
        if (!is_dir($dir)) {
            mkdir($dir, 0700, true);
        }
        file_put_contents($path, json_encode(['last_sent_at' => $this->time()], JSON_PRETTY_PRINT), LOCK_EX);
        @chmod($path, 0600);
    }

    private function path(string $owner, string $ruleId, string $recipient, string $sender): string
    {
        if (!preg_match('/^[A-Za-z0-9._-]+$/', $owner)) {
            throw new InvalidArgumentException('Invalid owner');
        }
        $hash = hash('sha256', implode('|', [$owner, $ruleId, strtolower($recipient), strtolower($sender)]));
        return rtrim($this->baseDir, '/') . '/replies/' . $owner . '/' . $hash . '.json';
    }

    private function time(): int
    {
        return $this->now ?? time();
    }
}