<?php
require_once '../include/init.php';
require_once '../include/auth.php';

// Only admins can purge cache
if (!isAdmin()) {
    http_response_code(403);
    echo json_encode(['success' => false, 'message' => 'Admin access required']);
    exit;
}

header('Content-Type: application/json');

$purgeType = $_POST['type'] ?? $_GET['type'] ?? 'all';
$purgeUrl = $_POST['url'] ?? $_GET['url'] ?? '';

try {
    switch ($purgeType) {
        case 'all':
            // Purge all cache
            $cacheDir = '../data/images/cache/';
            if (is_dir($cacheDir)) {
                $files = glob($cacheDir . '*');
                foreach ($files as $file) {
                    if (is_file($file)) {
                        unlink($file);
                    }
                }
            }
            
            // Send Varnish purge request
            $varnishHost = 'varnish';
            $varnishPort = 80;
            
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, "http://{$varnishHost}:{$varnishPort}/");
            curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PURGE');
            curl_setopt($ch, CURLOPT_HTTPHEADER, ['X-Purge-Regex: .*']);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($ch, CURLOPT_TIMEOUT, 5);
            curl_exec($ch);
            curl_close($ch);
            
            echo json_encode(['success' => true, 'message' => 'All cache purged successfully']);
            break;
            
        case 'image':
            if (empty($purgeUrl)) {
                throw new Exception('URL parameter required for image purge');
            }
            
            // Purge specific image from cache
            $cacheKey = md5($purgeUrl);
            $cacheFile = '../data/images/cache/' . $cacheKey;
            if (file_exists($cacheFile)) {
                unlink($cacheFile);
            }
            
            // Send Varnish purge request for specific URL
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, "http://varnish:80" . $purgeUrl);
            curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PURGE');
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($ch, CURLOPT_TIMEOUT, 5);
            curl_exec($ch);
            curl_close($ch);
            
            echo json_encode(['success' => true, 'message' => 'Image cache purged successfully']);
            break;
            
        case 'images':
            // Purge all image cache
            $cacheDir = '../data/images/cache/';
            if (is_dir($cacheDir)) {
                $files = glob($cacheDir . '*');
                foreach ($files as $file) {
                    if (is_file($file)) {
                        unlink($file);
                    }
                }
            }
            
            // Send Varnish purge request for images
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, "http://varnish:80/");
            curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PURGE');
            curl_setopt($ch, CURLOPT_HTTPHEADER, ['X-Purge-Regex: .*\.(jpg|jpeg|png|gif|webp|svg|ico)$']);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($ch, CURLOPT_TIMEOUT, 5);
            curl_exec($ch);
            curl_close($ch);
            
            echo json_encode(['success' => true, 'message' => 'Image cache purged successfully']);
            break;
            
        default:
            throw new Exception('Invalid purge type');
    }
    
} catch (Exception $e) {
    http_response_code(500);
    echo json_encode(['success' => false, 'message' => $e->getMessage()]);
}
?>