<?php

class Storage
{
    private string $dir;

    public function __construct(string $dir)
    {
        $this->dir = rtrim($dir, DIRECTORY_SEPARATOR);
        if (!is_dir($this->dir)) {
            mkdir($this->dir, 0777, true);
        }
        if (!is_writable($this->dir)) {
            throw new RuntimeException('Storage path not writable: ' . $this->dir);
        }
    }

    private function path(string $name): string
    {
        return $this->dir . DIRECTORY_SEPARATOR . $name . '.json';
    }

    public function get(string $name, $default = [])
    {
        $p = $this->path($name);
        if (!file_exists($p)) return $default;
        $data = json_decode((string)file_get_contents($p), true);
        return $data ?? $default;
    }

    public function set(string $name, $value): void
    {
        $p = $this->path($name);
        file_put_contents($p, json_encode($value, JSON_PRETTY_PRINT));
    }
}