<?php
// cache.php - Simple file-based caching
class SimpleCache
{
    private $cacheDir = 'cache/';
    private $enabled;

    public function __construct($enabled = true)
    {
        $this->enabled = $enabled && CACHE_ENABLED;
        if (!is_dir($this->cacheDir)) {
            mkdir($this->cacheDir, 0755, true);
        }
    }

    public function get($key)
    {
        if (!$this->enabled) return null;

        $file = $this->cacheDir . md5($key) . '.cache';
        if (file_exists($file) && (time() - filemtime($file)) < CACHE_DURATION) {
            return unserialize(file_get_contents($file));
        }
        return null;
    }

    public function set($key, $data)
    {
        if (!$this->enabled) return false;

        $file = $this->cacheDir . md5($key) . '.cache';
        return file_put_contents($file, serialize($data));
    }
}

// Global cache instance
$cache = new SimpleCache();