<?php
/**
 * Cache Manager for TigerStyle Dash
 * Lightning-fast cache operations
 */

// Prevent direct access
if (!defined('ABSPATH')) {
    exit;
}

class TigerStyle_Dash_Cache {
    
    /**
     * Cache directory
     */
    private $cache_dir;
    
    /**
     * Constructor
     */
    public function __construct() {
        $upload_dir = wp_upload_dir();
        $this->cache_dir = $upload_dir['basedir'] . '/tigerstyle-dash-cache/';
        
        // Ensure cache directory exists
        if (!file_exists($this->cache_dir)) {
            wp_mkdir_p($this->cache_dir);
        }
    }
    
    /**
     * Get cache key for URL
     */
    public function get_cache_key($url) {
        return md5($url);
    }
    
    /**
     * Store compressed content in cache
     */
    public function store($key, $content, $compression_method, $metadata = array()) {
        $cache_file = $this->cache_dir . $key . '.' . $compression_method;
        $meta_file = $this->cache_dir . $key . '.meta';
        
        // Store compressed content
        file_put_contents($cache_file, $content);
        
        // Store metadata
        $metadata['created'] = time();
        $metadata['compression_method'] = $compression_method;
        $metadata['size'] = strlen($content);
        file_put_contents($meta_file, json_encode($metadata));
        
        return true;
    }
    
    /**
     * Retrieve cached content
     */
    public function get($key, $compression_method) {
        $cache_file = $this->cache_dir . $key . '.' . $compression_method;
        $meta_file = $this->cache_dir . $key . '.meta';
        
        if (!file_exists($cache_file) || !file_exists($meta_file)) {
            return false;
        }
        
        $metadata = json_decode(file_get_contents($meta_file), true);
        if (!$metadata) {
            return false;
        }
        
        // Check if cache is expired
        $ttl = get_option('tigerstyle_dash_cache_ttl', 3600);
        if (time() - $metadata['created'] > $ttl) {
            $this->delete($key);
            return false;
        }
        
        return array(
            'content' => file_get_contents($cache_file),
            'metadata' => $metadata
        );
    }
    
    /**
     * Delete cached content
     */
    public function delete($key) {
        $files = glob($this->cache_dir . $key . '.*');
        foreach ($files as $file) {
            if (is_file($file)) {
                unlink($file);
            }
        }
        return true;
    }
    
    /**
     * Clear all cache
     */
    public function clear_all_cache() {
        $files = glob($this->cache_dir . '*');
        foreach ($files as $file) {
            if (is_file($file)) {
                unlink($file);
            }
        }
        return true;
    }
    
    /**
     * Get cache statistics
     */
    public function get_cache_stats() {
        $files = glob($this->cache_dir . '*.meta');
        $total_files = count($files);
        $total_size = 0;
        
        foreach ($files as $file) {
            $metadata = json_decode(file_get_contents($file), true);
            if ($metadata && isset($metadata['size'])) {
                $total_size += $metadata['size'];
            }
        }
        
        return array(
            'total_files' => $total_files,
            'total_size' => $total_size,
            'cache_dir' => $this->cache_dir
        );
    }
}