package com.ruoyi.common.utils.file;

import java.awt.image.BufferedImage;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import net.coobird.thumbnailator.Thumbnails;

import com.ruoyi.common.utils.uuid.IdUtils;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.hibernate.validator.constraints.Length;
import org.springframework.web.multipart.MultipartFile;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.exception.file.FileNameLengthLimitExceededException;
import com.ruoyi.common.exception.file.FileSizeLimitExceededException;
import com.ruoyi.common.exception.file.InvalidExtensionException;
import com.ruoyi.common.utils.DateUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.uuid.Seq;
import com.ruoyi.common.utils.SecurityUtils;

import javax.imageio.ImageIO;

/**
 * 文件上传工具类
 *
 * @author ruoyi
 */
public class FileUploadUtils
{
    /**
     * 默认大小 50M
     */
    public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;

    /**
     * 默认上传的地址
     */
    private static String defaultBaseDir = RuoYiConfig.getProfile();

    public static void setDefaultBaseDir(String defaultBaseDir)
    {
        FileUploadUtils.defaultBaseDir = defaultBaseDir;
    }

    public static String getDefaultBaseDir()
    {
        return defaultBaseDir;
    }

    /**
     * 以默认配置进行文件上传
     *
     * @param file 上传的文件
     * @return 文件名称
     * @throws Exception
     */
    public static final String upload(MultipartFile file) throws IOException
    {
        try
        {
            return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        }
        catch (Exception e)
        {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 根据文件路径上传
     *
     * @param baseDir 相对应用的基目录
     * @param file 上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static final String upload(String baseDir, MultipartFile file) throws IOException
    {
        try
        {
            return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        }
        catch (Exception e)
        {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 文件上传
     *
     * @param baseDir 相对应用的基目录
     * @param file 上传的文件
     * @param allowedExtension 上传文件类型
     * @return 返回上传成功的文件名
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws FileNameLengthLimitExceededException 文件名太长
     * @throws IOException 比如读写文件出错时
     * @throws InvalidExtensionException 文件校验异常
     */
    public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException
    {


        int fileNamelength = Objects.requireNonNull(file.getOriginalFilename()).length();
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH)
        {
            throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
        }

        assertAllowed(file, allowedExtension);

        //---------------------------------------------新版文件上传------------------------------------------------

        // 压缩处理（如果是图片）
        boolean isImage = file.getContentType() != null && file.getContentType().startsWith("image/");
        File compressedTempFile = null;
        try {
            if (isImage) {
                // 执行图片压缩
                compressedTempFile = new File(compressImage(file));

                // 生成新的文件名（保持原有格式）
                String originalFilename = file.getOriginalFilename();
                String[] stringList = originalFilename.split("\\.(?=[^\\.]+$)"); // 分割文件名和扩展名
                String baseName = stringList[0];
                String newExtension = stringList[1];  // 统一使用jpg扩展名

                System.out.println("originalFilename: " + originalFilename+ "  newExtension: " + newExtension);

                // 保持原有命名规则
                String uuid = IdUtils.simpleUUID();
                Long userId = SecurityUtils.getUserId();
                String timestampString = getTimestampString();
                String fileName = String.format("%s_%s_%s_%s.%s",
                        baseName, userId, uuid, timestampString, newExtension);

                // 检查压缩后的文件名长度
                if (fileName.length() > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
                    throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
                }

                // 保存压缩文件
                File destFile = getAbsoluteFile(baseDir, fileName);
                org.apache.commons.io.FileUtils.copyFile(compressedTempFile, destFile);
                return getPathFileName(baseDir, fileName);
            } else {
                // 非图片文件保持原逻辑
                String fileName = extractFilename(file);

                // 原有文件名处理逻辑
                String uuid = IdUtils.simpleUUID();
                Long userId = SecurityUtils.getUserId();
                String timestampString = getTimestampString();

                String[] stringList = fileName.split("\\.");
                fileName = String.format("%s_%s_%s_%s.%s",
                        stringList[0], userId, uuid, timestampString, stringList[1]);

                // 保存原始文件
                String absPath = getAbsoluteFile(baseDir, fileName).getAbsolutePath();
                file.transferTo(Paths.get(absPath));
                return getPathFileName(baseDir, fileName);
            }
        } finally {
            if (compressedTempFile != null) {
                compressedTempFile.delete(); // 确保删除临时文件
            }
        }
        //---------------------------------------------新版文件上传end------------------------------------------------


//        //------------------------------------------旧版文件上传=---------------------------------------------------------
//
//        String fileName = extractFilename(file);
//
//        String uuid = IdUtils.simpleUUID();
//
//        Long userId = SecurityUtils.getUserId();
//
//        // 获取当前时间的Instant对象
//        Instant now = Instant.now();
//
//        // 将Instant转换为指定时区的ZonedDateTime对象
//        ZonedDateTime zonedDateTime = now.atZone(ZoneId.systemDefault());
//
//        // 定义时间格式（ISO 8601格式）
//        DateTimeFormatter formatter = DateTimeFormatter.ISO_LOCAL_DATE_TIME;
//
//        // 格式化ZonedDateTime为字符串
//        String timestampString = zonedDateTime.format(formatter).replace("-", "_").replace(":", "_");
//
//
//        String[] stringList = fileName.split("\\.");
//        fileName = stringList[0] + "_"+ userId + "_" + uuid + "_" + timestampString + "." + stringList[1];
//
//        String absPath = getAbsoluteFile(baseDir, fileName).getAbsolutePath();
//
////        System.out.println("absPath"+absPath);
//
//        file.transferTo(Paths.get(absPath));
//
//        return getPathFileName(baseDir, fileName);
//        //------------------------------------------旧版文件上传=---------------------------------------------------------
    }

    // 时间戳生成方法
    private static String getTimestampString() {
        return Instant.now().atZone(ZoneId.systemDefault())
                .format(DateTimeFormatter.ISO_LOCAL_DATE_TIME)
                .replace("-", "_").replace(":", "_");
    }

    /**
     * 编码文件名
     */
    public static final String extractFilename(MultipartFile file)
    {
        return StringUtils.format("{}/{}_{}.{}", DateUtils.datePath(),
                FilenameUtils.getBaseName(file.getOriginalFilename()), Seq.getId(Seq.uploadSeqType), getExtension(file));
    }

    public static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException
    {
        File desc = new File(uploadDir + File.separator + fileName);

        if (!desc.exists())
        {
            if (!desc.getParentFile().exists())
            {
                desc.getParentFile().mkdirs();
            }
        }
        return desc;
    }

    public static final String getPathFileName(String uploadDir, String fileName) throws IOException
    {
        int dirLastIndex = RuoYiConfig.getProfile().length() + 1;
        String currentDir = StringUtils.substring(uploadDir, dirLastIndex);

        String domain = RuoYiConfig.getDomain();
//        System.out.println("domain"+domain+Constants.RESOURCE_PREFIX  + "/" + fileName);
//        System.out.println("domain"+domain+Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName);

        // currentDir若是为空，就会有 // 两根斜杠
        if (StringUtils.isNotBlank(currentDir))
        {
            return domain+Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
        }
        return domain+Constants.RESOURCE_PREFIX  + "/" + fileName;
    }

    /**
     * 文件大小校验
     *
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException
     */
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException
    {
        long size = file.getSize();
        if (size > DEFAULT_MAX_SIZE)
        {
            throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
        }

        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension))
        {
            if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
                        fileName);
            }
            else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
                        fileName);
            }
            else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
                        fileName);
            }
            else if (allowedExtension == MimeTypeUtils.VIDEO_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidVideoExtensionException(allowedExtension, extension,
                        fileName);
            }
            else
            {
                throw new InvalidExtensionException(allowedExtension, extension, fileName);
            }
        }
    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     *
     * @param extension
     * @param allowedExtension
     * @return
     */
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension)
    {
        for (String str : allowedExtension)
        {
            if (str.equalsIgnoreCase(extension))
            {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件名的后缀
     *
     * @param file 表单文件
     * @return 后缀名
     */
    public static final String getExtension(MultipartFile file)
    {
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        if (StringUtils.isEmpty(extension))
        {
            extension = MimeTypeUtils.getExtension(Objects.requireNonNull(file.getContentType()));
        }
        return extension;
    }

    /**
     * 添加图片压缩处理
     * @param file 上传的文件
     * @return 压缩后的文件名
     * @throws IOException
     */
    private static String compressImage(MultipartFile file) throws IOException {
        // 创建临时文件（保留原始扩展名）
        String originalFilename = file.getOriginalFilename();
        String fileExtension = originalFilename.substring(originalFilename.lastIndexOf(".") + 1);

        System.out.println("originalFilename:"+originalFilename + " fileExtension:"+fileExtension);

        Path tempFile = Files.createTempFile("compress_", "." + fileExtension);

        try (InputStream is = file.getInputStream()) {
            // 获取原始尺寸
            BufferedImage srcImage = ImageIO.read(is);
            int originalWidth = srcImage.getWidth();
            int originalHeight = srcImage.getHeight();



            // 压缩处理（保持原尺寸）
            Thumbnails.of(file.getInputStream())
                    .size(originalWidth, originalHeight) // 显式指定原始尺寸
                    .outputQuality(0.7) // 质量压缩
                    .outputFormat(fileExtension) // 保持原格式
                    .toFile(tempFile.toFile());

//            // 日志记录
//            System.out.printf("压缩完成：尺寸 %dx%d -> %dx%d | 体积 %.2fMB -> %.2fMB%n",
//                    originalWidth, originalHeight,
//                    srcImage.getWidth(), srcImage.getHeight(),
//                    file.getSize() / 1024.0 / 1024.0,
//                    tempFile.toFile().length() / 1024.0 / 1024.0);

            return tempFile.toString();
        } catch (IOException e) {
            Files.deleteIfExists(tempFile);
            throw new IOException("压缩失败: " + e.getMessage(), e);
        }
    }


}
