package com.njcn.ali.oss.util;

import cn.hutool.core.io.FileUtil;
import cn.hutool.core.util.ObjUtil;
import com.aliyun.oss.OSS;
import com.aliyun.oss.common.comm.ResponseMessage;
import com.aliyun.oss.model.*;
import com.njcn.ali.oss.config.AliYunOssConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import javax.annotation.Resource;
import java.io.*;
import java.net.URL;
import java.util.Comparator;
import java.util.Date;
import java.util.List;

/**
 * 阿里云OSS核心工具类
 * 封装常用操作：上传、下载、删除、查询、生成临时访问URL等
 *
 * @author web2023
 */
@Component
public class AliYunOssUtils {
    private static final Logger logger = LoggerFactory.getLogger(AliYunOssUtils.class);
    @Resource
    private OSS ossClient;
    @Resource
    private AliYunOssConfig ossConfig;

    /**
     * 上传文件（字节数组）
     *
     * @param objectName 文件在OSS中的路径/名称
     * @param content    文件字节数组
     * @return 上传结果ETag
     */
    public String uploadFile(String objectName, byte[] content) {
        return uploadFile(objectName, new ByteArrayInputStream(content));
    }

    /**
     * 上传文件（InputStream）
     *
     * @param objectName  文件在OSS中的路径/名称
     * @param inputStream 文件输入流
     * @return 上传结果ETag
     */
    public String uploadFile(String objectName, InputStream inputStream) {
        try {
            PutObjectResult result = ossClient.putObject(
                    ossConfig.getBucket(),
                    objectName,
                    inputStream
            );
            return result.getETag();
        } catch (Exception e) {
            logger.error("文件{}上传失败", objectName, e);
            throw new RuntimeException("文件上传失败：" + objectName, e);
        }
    }

    /**
     * 上传文件（MultipartFile）
     *
     * @param objectName    文件在OSS中的路径/名称
     * @param multipartFile 文件输入流
     * @return 上传结果ETag
     */
    public String uploadFile(String objectName, MultipartFile multipartFile) {
        try {
            PutObjectResult result = ossClient.putObject(
                    ossConfig.getBucket(),
                    objectName,
                    multipartFile.getInputStream()
            );
            return result.getETag();
        } catch (Exception e) {
            logger.error("文件{}上传失败", objectName, e);
            throw new RuntimeException("文件上传失败：" + objectName, e);
        }
    }


    /**
     * 上传本地文件
     *
     * @param objectName    文件在OSS中的路径/名称
     * @param localFilePath 本地文件路径
     * @return 上传结果ETag
     */
    public String uploadLocalFile(String objectName, String localFilePath) {
        File file = new File(localFilePath);
        if (!file.exists()) {
            throw new RuntimeException("本地文件不存在：" + localFilePath);
        }
        try {
            PutObjectResult result = ossClient.putObject(
                    ossConfig.getBucket(),
                    objectName,
                    file
            );
            return result.getETag();
        } catch (Exception e) {
            logger.error("本地文件{}上传失败", localFilePath, e);
            throw new RuntimeException("本地文件上传失败：" + localFilePath, e);
        }
    }

    /**
     * 下载文件到本地
     *
     * @param objectName    OSS中的文件名称/路径
     * @param localFilePath 本地保存路径
     */
    public void downloadFile(String objectName, String localFilePath) {
        try {
            ossClient.getObject(
                    new GetObjectRequest(ossConfig.getBucket(), objectName),
                    new File(localFilePath)
            );
        } catch (Exception e) {
            logger.error("文件{}下载失败", objectName, e);
            throw new RuntimeException("文件下载失败：" + objectName, e);
        }
    }

    /**
     * 下载文件为字节流
     *
     * @param objectName OSS中的文件名称/路径
     * @return 文件字节流
     */
    public InputStream downloadStream(String objectName) {
        try (OSSObject ossObject = ossClient.getObject(ossConfig.getBucket(), objectName);
             InputStream inputStream = ossObject.getObjectContent()) {
            return inputStream;
        } catch (Exception e) {
            logger.error("文件{}下载为字节数组失败", objectName, e);
            throw new RuntimeException("文件下载为字节数组失败：" + objectName, e);
        }
    }

    /**
     * 下载文件为字节数组
     *
     * @param objectName OSS中的文件名称/路径
     * @return 文件字节数组
     */
    public byte[] downloadFileToBytes(String objectName) {
        try (OSSObject ossObject = ossClient.getObject(ossConfig.getBucket(), objectName);
             InputStream inputStream = ossObject.getObjectContent();
             ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {

            byte[] buffer = new byte[1024];
            int len;
            while ((len = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, len);
            }
            return outputStream.toByteArray();
        } catch (Exception e) {
            logger.error("文件{}下载为字节数组失败", objectName, e);
            throw new RuntimeException("文件下载为字节数组失败：" + objectName, e);
        }
    }

    /**
     * 下载文件为文件
     *
     * @param folderPath OSS中的文件名称/路径
     * @return 文件
     */
    public File getLastFile(String folderPath) {
        try {
            // 列出文件夹下所有文件（分页处理，避免文件过多）
            ObjectListing objectListing = ossClient.listObjects(ossConfig.getBucket(), folderPath);
            List<OSSObjectSummary> objectSummaries = objectListing.getObjectSummaries();

            // 处理空文件夹
            if (objectSummaries.isEmpty()) {
                logger.warn("OSS文件夹 {} 下无文件", folderPath);
                return null;
            }

            // 按最后修改时间降序排序，取第一个（最新）
            String latestFileName = objectSummaries.stream()
                    .filter(summary -> !summary.getKey().equals(folderPath))
                    .max(Comparator.comparing(OSSObjectSummary::getLastModified))
                    .map(OSSObjectSummary::getKey)
                    .orElse(null);
            if (ObjUtil.isNull(latestFileName)) {
                throw new RuntimeException("OSS文件夹 " + folderPath + " 下无可用文件");
            }
            File file = File.createTempFile(latestFileName.split(".xlsx")[0], ".xlsx");
            InputStream inputStream = ossClient.getObject(ossConfig.getBucket(), latestFileName).getObjectContent();
            FileUtil.writeFromStream(inputStream, file);
            inputStream.close();
            return file;
        } catch (Exception e) {
            logger.error("查找OSS文件夹 {} 最新文件失败", folderPath, e);
            throw new RuntimeException("查找最新文件失败：" + folderPath, e);
        }finally {

        }
    }

    public static void main(String[] args) {
        String latestFileName="latestFileNam.xlsx";

        String s = latestFileName.split(".xlsx")[0];
        System.out.println();
    }
    /**
     * 删除单个文件
     *
     * @param objectName OSS中的文件名称/路径
     */
    public void deleteFile(String objectName) {
        try {
            VoidResult voidResult = ossClient.deleteObject(ossConfig.getBucket(), objectName);
            ResponseMessage response = voidResult.getResponse();
            System.out.println(response);
        } catch (Exception e) {
            logger.error("文件{}删除失败", objectName, e);
            throw new RuntimeException("文件删除失败：" + objectName, e);
        }
    }

    /**
     * 批量删除文件
     *
     * @param objectNames 文件名称列表
     */
    public void deleteFiles(List<String> objectNames) {
        try {
            // 静默删除，不返回删除结果
            DeleteObjectsRequest request = new DeleteObjectsRequest(ossConfig.getBucket())
                    .withKeys(objectNames);
            ossClient.deleteObjects(request);
        } catch (Exception e) {
            logger.error("批量删除文件失败", e);
            throw new RuntimeException("批量删除文件失败", e);
        }
    }

    /**
     * 判断文件是否存在
     *
     * @param objectName OSS中的文件名称/路径
     * @return true-存在，false-不存在
     */
    public boolean isFileExist(String objectName) {
        try {
            boolean exists = ossClient.doesObjectExist(ossConfig.getBucket(), objectName);
            return exists;
        } catch (Exception e) {
            logger.error("判断文件{}是否存在失败", objectName, e);
            throw new RuntimeException("判断文件是否存在失败：" + objectName, e);
        }
    }

    /**
     * 生成文件临时访问URL
     *
     * @param objectName    OSS中的文件名称/路径
     * @param expireSeconds 过期时间（秒）
     * @return 临时访问URL
     */
    public String generatePresignedUrl(String objectName, int expireSeconds) {
        try {
            Date expiration = new Date(System.currentTimeMillis() + expireSeconds * 1000L);
            URL url = ossClient.generatePresignedUrl(
                    ossConfig.getBucket(),
                    objectName,
                    expiration
            );
            String urlStr = url.toString();
            logger.info("文件{}生成临时访问URL成功，过期时间：{}秒", objectName, expireSeconds);
            return urlStr;
        } catch (Exception e) {
            logger.error("生成文件{}临时访问URL失败", objectName, e);
            throw new RuntimeException("生成临时访问URL失败：" + objectName, e);
        }
    }

    /**
     * 关闭OSS客户端
     */
    public void close() {
        if (ossClient != null) {
            ossClient.shutdown();
            logger.info("OSS客户端已关闭");
        }
    }
}