<?php
header('Content-Type: application/json; charset=utf-8');

// 设置错误报告
error_reporting(E_ALL);
ini_set('display_errors', 1);

// 允许跨域请求（如果需要）
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: POST');
header('Access-Control-Allow-Headers: Content-Type');

// 检查请求方法
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    echo json_encode([
        'success' => false,
        'message' => '只支持POST请求'
    ]);
    exit;
}

// 获取参数
$uploadFileName = isset($_POST['uploadFileName']) ? $_POST['uploadFileName'] : '';
$file = isset($_FILES['file']) ? $_FILES['file'] : null;

// 验证参数
if (empty($uploadFileName)) {
    echo json_encode([
        'success' => false,
        'message' => 'uploadFileName参数不能为空'
    ]);
    exit;
}

if (!$file || $file['error'] !== UPLOAD_ERR_OK) {
    $errorMessage = '文件上传失败';
    if ($file) {
        switch ($file['error']) {
            case UPLOAD_ERR_INI_SIZE:
                $errorMessage = '文件大小超过php.ini限制';
                break;
            case UPLOAD_ERR_FORM_SIZE:
                $errorMessage = '文件大小超过表单限制';
                break;
            case UPLOAD_ERR_PARTIAL:
                $errorMessage = '文件只有部分被上传';
                break;
            case UPLOAD_ERR_NO_FILE:
                $errorMessage = '没有文件被上传';
                break;
            case UPLOAD_ERR_NO_TMP_DIR:
                $errorMessage = '找不到临时文件夹';
                break;
            case UPLOAD_ERR_CANT_WRITE:
                $errorMessage = '文件写入失败';
                break;
        }
    }
    echo json_encode([
        'success' => false,
        'message' => $errorMessage
    ]);
    exit;
}

// 验证文件类型（可选）
$allowedTypes = ['image/jpeg', 'image/jpg', 'image/png', 'image/gif', 'application/pdf', 'application/msword', 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'];
if (!in_array($file['type'], $allowedTypes)) {
    echo json_encode([
        'success' => false,
        'message' => '不支持的文件类型：' . $file['type']
    ]);
    exit;
}

// 验证文件大小（限制为10MB）
$maxFileSize = 10 * 1024 * 1024; // 10MB
if ($file['size'] > $maxFileSize) {
    echo json_encode([
        'success' => false,
        'message' => '文件大小超过限制（最大10MB）'
    ]);
    exit;
}

try {
    // 创建年月目录
    $yearMonth = date('Ym');
    $uploadDir = "../upload/{$yearMonth}/";
    
    // 如果目录不存在则创建
    if (!is_dir($uploadDir)) {
        if (!mkdir($uploadDir, 0755, true)) {
            throw new Exception('无法创建目录：' . $uploadDir);
        }
    }
    
    // 生成唯一文件名
    $fileExtension = pathinfo($file['name'], PATHINFO_EXTENSION);
    $uniqueFileName = $uploadFileName . '_' . time() . '_' . uniqid() . '.' . $fileExtension;
    $filePath = $uploadDir . $uniqueFileName;
    
    // 移动上传的文件
    if (!move_uploaded_file($file['tmp_name'], $filePath)) {
        throw new Exception('文件保存失败');
    }
    
    // 如果是图片，生成缩略图
    $thumbnailPath = '';
    if (in_array($file['type'], ['image/jpeg', 'image/jpg', 'image/png', 'image/gif'])) {
        $thumbnailPath = $uploadDir . 's_' . $uniqueFileName;
        createThumbnail($filePath, $thumbnailPath, 100, 0);
    }
    
    // 返回成功信息
    $response = [
        'success' => true,
        'message' => '文件上传成功',
        'data' => [
            'originalName' => $file['name'],
            'fileName' => $uniqueFileName,
            'filePath' => str_replace('../', 'https://sys.966120.com.cn/', $filePath),
            'thumbnailPath' => $thumbnailPath ? str_replace('../', 'https://sys.966120.com.cn/', $thumbnailPath) : '',
            'fileSize' => $file['size'],
            'fileType' => $file['type'],
            'uploadTime' => date('Y-m-d H:i:s')
        ]
    ];
    
    echo json_encode($response);
    
} catch (Exception $e) {
    echo json_encode([
        'success' => false,
        'message' => '上传失败：' . $e->getMessage()
    ]);
}

/**
 * 创建缩略图
 * @param string $sourcePath 源图片路径
 * @param string $targetPath 目标缩略图路径
 * @param int $width 宽度
 * @param int $height 高度（0表示按比例缩放）
 */
function createThumbnail($sourcePath, $targetPath, $width, $height) {
    $imageInfo = getimagesize($sourcePath);
    if (!$imageInfo) {
        return false;
    }
    
    $sourceWidth = $imageInfo[0];
    $sourceHeight = $imageInfo[1];
    $imageType = $imageInfo[2];
    
    // 计算缩略图尺寸
    if ($height == 0) {
        $height = floor($width / $sourceWidth * $sourceHeight);
    } elseif ($width == 0) {
        $width = floor($height / $sourceHeight * $sourceWidth);
    }
    
    // 创建源图像
    switch ($imageType) {
        case IMAGETYPE_GIF:
            $sourceImage = imagecreatefromgif($sourcePath);
            break;
        case IMAGETYPE_JPEG:
            $sourceImage = imagecreatefromjpeg($sourcePath);
            break;
        case IMAGETYPE_PNG:
            $sourceImage = imagecreatefrompng($sourcePath);
            break;
        default:
            return false;
    }
    
    if (!$sourceImage) {
        return false;
    }
    
    // 创建缩略图
    $thumbnailImage = imagecreatetruecolor($width, $height);
    
    // 保持PNG透明度
    if ($imageType == IMAGETYPE_PNG) {
        imagealphablending($thumbnailImage, false);
        imagesavealpha($thumbnailImage, true);
        $transparent = imagecolorallocatealpha($thumbnailImage, 255, 255, 255, 127);
        imagefilledrectangle($thumbnailImage, 0, 0, $width, $height, $transparent);
    }
    
    // 调整图像大小
    imagecopyresampled($thumbnailImage, $sourceImage, 0, 0, 0, 0, $width, $height, $sourceWidth, $sourceHeight);
    
    // 保存缩略图
    $result = false;
    switch ($imageType) {
        case IMAGETYPE_GIF:
            $result = imagegif($thumbnailImage, $targetPath);
            break;
        case IMAGETYPE_JPEG:
            $result = imagejpeg($thumbnailImage, $targetPath, 90);
            break;
        case IMAGETYPE_PNG:
            $result = imagepng($thumbnailImage, $targetPath, 9);
            break;
    }
    
    // 释放内存
    imagedestroy($sourceImage);
    imagedestroy($thumbnailImage);
    
    return $result;
}
?>