<?php
require_once '../include/init.php';
require_once '../include/auth.php';

// Set proper headers
header('Content-Type: application/json');

// Check if URL parameter is provided
if (!isset($_GET['url']) || empty($_GET['url'])) {
    http_response_code(400);
    echo json_encode(['error' => 'URL parameter is required']);
    exit;
}

$imageUrl = $_GET['url'];
$width = isset($_GET['w']) ? intval($_GET['w']) : null;
$height = isset($_GET['h']) ? intval($_GET['h']) : null;
$quality = isset($_GET['q']) ? intval($_GET['q']) : 85;

// Validate URL
if (!filter_var($imageUrl, FILTER_VALIDATE_URL)) {
    http_response_code(400);
    echo json_encode(['error' => 'Invalid URL']);
    exit;
}

// Allowed domains (add your CDN domains here)
$allowedDomains = [
    'cdn.jsdelivr.net',
    'favicon.hibbit.net',
    'favicon.hibbit.cloud',
    'localhost',
    '127.0.0.1'
];

$parsedUrl = parse_url($imageUrl);
$domain = $parsedUrl['host'] ?? '';

if (!in_array($domain, $allowedDomains)) {
    http_response_code(403);
    echo json_encode(['error' => 'Domain not allowed']);
    exit;
}

// Create cache directory
$cacheDir = '../data/images/cache/';
if (!is_dir($cacheDir)) {
    mkdir($cacheDir, 0755, true);
}

// Generate cache key
$cacheKey = md5($imageUrl . $width . $height . $quality);
$cacheFile = $cacheDir . $cacheKey;

// Check if cached version exists and is fresh (1 day)
if (file_exists($cacheFile) && (time() - filemtime($cacheFile)) < 86400) {
    // Serve cached file
    $imageInfo = getimagesize($cacheFile);
    if ($imageInfo) {
        header('Content-Type: ' . $imageInfo['mime']);
        header('Content-Length: ' . filesize($cacheFile));
        header('Cache-Control: public, max-age=86400');
        header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 86400) . ' GMT');
        header('ETag: "' . $cacheKey . '"');
        readfile($cacheFile);
        exit;
    }
}

// Fetch the image
$context = stream_context_create([
    'http' => [
        'timeout' => 30,
        'user_agent' => 'Bookmarkly Image Proxy/1.0',
        'follow_location' => true,
        'max_redirects' => 5
    ]
]);

$imageData = @file_get_contents($imageUrl, false, $context);

if ($imageData === false) {
    http_response_code(404);
    echo json_encode(['error' => 'Failed to fetch image']);
    exit;
}

// Check if ImageMagick is available for processing
if (extension_loaded('imagick') && ($width || $height || $quality < 100)) {
    try {
        $imagick = new Imagick();
        $imagick->readImageBlob($imageData);
        
        // Resize if dimensions are specified
        if ($width || $height) {
            $imagick->resizeImage(
                $width ?: 0, 
                $height ?: 0, 
                Imagick::FILTER_LANCZOS, 
                1
            );
        }
        
        // Set quality for JPEG
        if ($imagick->getImageFormat() === 'JPEG') {
            $imagick->setImageCompressionQuality($quality);
        }
        
        $processedData = $imagick->getImageBlob();
        $imagick->destroy();
        
        // Save to cache
        file_put_contents($cacheFile, $processedData);
        
        // Set headers
        $imageInfo = getimagesize($cacheFile);
        header('Content-Type: ' . $imageInfo['mime']);
        header('Content-Length: ' . strlen($processedData));
        header('Cache-Control: public, max-age=86400');
        header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 86400) . ' GMT');
        header('ETag: "' . $cacheKey . '"');
        
        echo $processedData;
        exit;
        
    } catch (Exception $e) {
        // Fallback to original image if processing fails
        error_log('Image processing failed: ' . $e->getMessage());
    }
}

// Serve original image and cache it
file_put_contents($cacheFile, $imageData);

$imageInfo = @getimagesize($cacheFile);
if ($imageInfo) {
    header('Content-Type: ' . $imageInfo['mime']);
} else {
    header('Content-Type: image/jpeg'); // fallback
}

header('Content-Length: ' . strlen($imageData));
header('Cache-Control: public, max-age=86400');
header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 86400) . ' GMT');
header('ETag: "' . $cacheKey . '"');

echo $imageData;
?>