<?php
declare(strict_types=1);
namespace App\Repository\Pdo;

use App\Repository\AppStateRepository;
use PDO;

final class PdoAppStateRepository implements AppStateRepository
{
    public function __construct(private PDO $pdo) {}

    /** @return array{value: string, updated_at: int}|null */
    public function get(string $key): ?array
    {
        $st = $this->pdo->prepare('SELECT v, updated_at FROM move_app_state WHERE k = ?');
        $st->execute([$key]);
        $row = $st->fetch();
        if ($row === false) return null;
        return ['value' => (string)$row['v'], 'updated_at' => (int)$row['updated_at']];
    }

    public function set(string $key, string $value, int $now): void
    {
        // upsert 문법이 엔진마다 다르다. sqlite 통합 테스트가 납품되는 실제 SQL 을 돌리므로
        // 둘 다 맞아야 한다 — MySQL 은 ON DUPLICATE KEY, sqlite 는 ON CONFLICT.
        $mysql = $this->pdo->getAttribute(PDO::ATTR_DRIVER_NAME) !== 'sqlite';
        $sql = $mysql
            ? 'INSERT INTO move_app_state (k, v, updated_at) VALUES (?, ?, ?)
               ON DUPLICATE KEY UPDATE v = VALUES(v), updated_at = VALUES(updated_at)'
            : 'INSERT INTO move_app_state (k, v, updated_at) VALUES (?, ?, ?)
               ON CONFLICT(k) DO UPDATE SET v = excluded.v, updated_at = excluded.updated_at';
        $this->pdo->prepare($sql)->execute([$key, $value, $now]);
    }
}