<?php
declare(strict_types=1);

class Settings
{
    private static ?array $cache = null;

    public static function all(): array
    {
        if (self::$cache !== null) return self::$cache;
        $rows = db()->query("SELECT `key`, `value` FROM settings")->fetchAll();
        $map  = [];
        foreach ($rows as $r) $map[$r['key']] = $r['value'];
        self::$cache = $map;
        return $map;
    }

    public static function get(string $key, string $default = ''): string
    {
        $all = self::all();
        return $all[$key] ?? $default;
    }

    public static function set(string $key, string $value): void
    {
        $stmt = db()->prepare("INSERT INTO settings (`key`, `value`) VALUES (?, ?) ON DUPLICATE KEY UPDATE `value` = ?");
        $stmt->execute([$key, $value, $value]);
        self::$cache = null;
    }

    public static function setMany(array $pairs): void
    {
        $db = db();
        $stmt = $db->prepare("INSERT INTO settings (`key`, `value`) VALUES (?, ?) ON DUPLICATE KEY UPDATE `value` = ?");
        foreach ($pairs as $key => $value) {
            $stmt->execute([$key, (string)$value, (string)$value]);
        }
        self::$cache = null;
    }
}