package com.linkwechat.common.utils.file;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.linkwechat.common.config.CosConfig;
import com.linkwechat.common.config.RuoYiConfig;
import com.linkwechat.common.constant.Constants;
import com.linkwechat.common.exception.file.FileNameLengthLimitExceededException;
import com.linkwechat.common.exception.file.FileSizeLimitExceededException;
import com.linkwechat.common.exception.file.InvalidExtensionException;
import com.linkwechat.common.utils.DateUtils;
import com.linkwechat.common.utils.StringUtils;
import com.linkwechat.common.utils.uuid.IdUtils;
import com.qcloud.cos.COSClient;
import com.qcloud.cos.ClientConfig;
import com.qcloud.cos.auth.BasicCOSCredentials;
import com.qcloud.cos.auth.COSCredentials;
import com.qcloud.cos.model.ObjectMetadata;
import com.qcloud.cos.model.PutObjectRequest;
import com.qcloud.cos.model.PutObjectResult;
import com.qcloud.cos.region.Region;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.FilenameUtils;
import org.springframework.web.multipart.MultipartFile;

/**
 * 文件上传工具类
 *
 * @author ruoyi
 */
@Slf4j
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);
        }
    }


    /**
     * 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 uploadFile(MultipartFile file) throws IOException {
        try {
            return uploadFile(getDefaultBaseDir(), file);
        } 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 = file.getOriginalFilename().length();
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
            throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
        }

        assertAllowed(file, allowedExtension);

        String fileName = extractFilename(file);

        File desc = getAbsoluteFile(baseDir, fileName);
        file.transferTo(desc);
        String pathFileName = getPathFileName(baseDir, fileName);
        return pathFileName;
    }

    /**
     * 上传到腾讯对象云存储中
     *
     * @param file    上传的文件
     * @return 访问路径
     * @throws IOException
     */
    public static final String upload2Cos(MultipartFile file , CosConfig cosConfig) throws IOException {
        try {
            return upload2Cos( file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION,cosConfig);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 通过流进行文件上传
     * @param in 流
     * @throws IOException
     */
    public static String upload2Cos(InputStream in, String fileExtension, CosConfig cosConfig) throws IOException {
        try {
            return upload2Cos( in, fileExtension, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION, cosConfig);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }


    /**
     * 文件上传
     *
     * @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 upload2Cos( MultipartFile file, String[] allowedExtension, CosConfig cosConfig)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException {
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
            throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
        }

        assertAllowed(file, allowedExtension);

        String fileName = extractFilename(file);
        // 1 初始化用户身份信息（secretId, secretKey）。
        COSCredentials cred = new BasicCOSCredentials(cosConfig.getSecretId(), cosConfig.getSecretKey());
        // 2 设置 bucket 的区域, COS 地域的简称请参照 https://cloud.tencent.com/document/product/436/6224
        // clientConfig 中包含了设置 region, https(默认 http), 超时, 代理等 set 方法, 使用可参见源码或者常见问题 Java SDK 部分。
        Region region = new Region(cosConfig.getRegion());
        ClientConfig clientConfig = new ClientConfig(region);
        // 3 生成 cos 客户端。
        COSClient cosClient = new COSClient(cred, clientConfig);

        // 指定要上传到 COS 上对象键
        String key = "exampleobject";
        ObjectMetadata objectMetadata = new ObjectMetadata();
        PutObjectRequest putObjectRequest = new PutObjectRequest(cosConfig.getBucketName(), fileName,file.getInputStream(),objectMetadata);
        PutObjectResult putObjectResult = cosClient.putObject(putObjectRequest);
        log.info("{}","https://link-wechat-1251309172.cos.ap-nanjing.myqcloud.com/"+fileName);
        log.info("腾讯cos上传信息：{}",new ObjectMapper().writeValueAsString(putObjectResult));
        cosClient.shutdown();

        return fileName;
    }

    /**
     * 将流中的文件传到腾讯云
     * @param inputStream 输入流
     * @param fileExtension 被写入流的文件的后缀名
     * @param allowedExtension 允许的后缀名
     * @throws FileSizeLimitExceededException 文件大小超过上限
     * @throws InvalidExtensionException 文件后缀名非法
     */
    public static String upload2Cos(InputStream inputStream, String fileExtension, String[] allowedExtension, CosConfig cosConfig) throws FileSizeLimitExceededException, InvalidExtensionException {
        String fileName = DateUtils.datePath() + "/" + IdUtils.fastUUID() + "." + fileExtension;
        if (!isAllowedExtension(fileExtension, allowedExtension))
        {
            throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, fileExtension, fileName);
        }
        COSCredentials cred = new BasicCOSCredentials(cosConfig.getSecretId(), cosConfig.getSecretKey());
        Region region = new Region(cosConfig.getRegion());
        ClientConfig clientConfig = new ClientConfig(region);
        COSClient cosClient = new COSClient(cred, clientConfig);
        ObjectMetadata objectMetadata = new ObjectMetadata();
        PutObjectRequest putObjectRequest = new PutObjectRequest(cosConfig.getBucketName(), fileName ,inputStream ,objectMetadata);
        cosClient.putObject(putObjectRequest);
        cosClient.shutdown();
        return fileName;
    }


    public static final String uploadFile(String baseDir, MultipartFile file)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException {
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
            throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
        }

        String fileName = extractFilename(file);

        File desc = getAbsoluteFile(baseDir, fileName);
        file.transferTo(desc);
        String pathFileName = getPathFileName(baseDir, fileName);
        return pathFileName;
    }

    /**
     * 编码文件名
     */
    public static final String extractFilename(MultipartFile file) {
        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        fileName = DateUtils.datePath() + "/" + IdUtils.fastUUID() + "." + extension;
        return fileName;
    }

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

        if (!desc.getParentFile().exists()) {
            desc.getParentFile().mkdirs();
        }
        if (!desc.exists()) {
            desc.createNewFile();
        }
        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 pathFileName;
        if(org.apache.commons.lang3.StringUtils.isBlank(currentDir)){
//            pathFileName = Constants.RESOURCE_PREFIX + "/" +fileName;
            pathFileName = "/" +fileName;
        }else {
//            pathFileName = Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
            pathFileName = "/" + currentDir + "/" + fileName;
        }
        return pathFileName;
    }

    /**
     * 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 (DEFAULT_MAX_SIZE != -1 && 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 {
                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(file.getContentType());
        }
        return extension;
    }
}
