<?php
// ηSpace 老照片修复 - PHP 代理
// 将上传图片转发给 Node.js Sharp 处理引擎

header('Access-Control-Allow-Origin: *');

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    die('Method not allowed');
}

// Check file uploaded
if (!isset($_FILES['image']) || $_FILES['image']['error'] !== UPLOAD_ERR_OK) {
    http_response_code(400);
    die('请选择一张图片');
}

$file = $_FILES['image'];

// Validate type
$allowed = ['image/jpeg', 'image/png', 'image/webp'];
if (!in_array($file['type'], $allowed)) {
    http_response_code(400);
    die('仅支持 JPG、PNG、WebP 格式');
}

// Limit size (20MB)
if ($file['size'] > 20 * 1024 * 1024) {
    http_response_code(400);
    die('图片太大，请选择小于 20MB 的图片');
}

$tmpPath = $file['tmp_name'];

// Check if curl is available
if (!function_exists('curl_init')) {
    http_response_code(500);
    die('服务器缺少 curl 扩展');
}

// Forward to Node.js server
$ch = curl_init();
curl_setopt_array($ch, [
    CURLOPT_URL => 'http://127.0.0.1:3001/photo-restore',
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => ['image' => new CURLFile($tmpPath, $file['type'], $file['name'])],
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_TIMEOUT => 60,
    CURLOPT_CONNECTTIMEOUT => 5,
]);

$result = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
$error = curl_error($ch);
curl_close($ch);

if ($result === false || $httpCode !== 200) {
    http_response_code(500);
    die('处理失败: ' . ($error ?: '服务内部错误'));
}

// Return the processed image
header('Content-Type: ' . ($contentType ?: 'image/jpeg'));
header('Content-Length: ' . strlen($result));
header('Cache-Control: no-cache');
echo $result;