package com.sandu.common.file.impl;

import cn.hutool.core.collection.CollectionUtil;
import cn.hutool.core.date.LocalDateTimeUtil;
import cn.hutool.core.io.FileTypeUtil;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.lang.UUID;
import com.sandu.common.enums.FileStorageEnums;
import com.sandu.common.execption.BusinessException;
import com.sandu.common.file.*;
import com.sandu.common.file.config.FileProperties;
import com.sandu.common.util.SpringContextHolder;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.time.LocalDate;
import java.util.List;
import java.util.Optional;

/**
 * @author chenjiantian 本地服务器上传
 */
@Slf4j
@Service
@AllArgsConstructor
public class LocalFileUploadImpl implements IFileUpload {

    private static List<String> videoSuffixList = CollectionUtil.newArrayList("mp4", "mov", "avi", "mkv", "m4v", "wmv",
            "asf", "asx", "rm", "rmvb", "3gp", "dat", "flv", "vob");

    private final FileToThumbnail fileToThumbnail;

    @Override
    public FileUploadDto uploadFile(MultipartFile multipartFile) {
        FileProperties fileProperties = SpringContextHolder.getBean(FileProperties.class);
        String originalFilename = multipartFile.getOriginalFilename();
        long size = multipartFile.getSize();
        String suffix = FileUtil.getSuffix(originalFilename);
        String date = LocalDateTimeUtil.formatNormal(LocalDate.now());
        String uuidStr = UUID.fastUUID().toString();
        String fileName = uuidStr + "." + suffix;
        File dest;
        try {
            String type = Optional.ofNullable(FileTypeUtil.getType(multipartFile.getInputStream(), originalFilename)).orElse("");
            dest = new File(fileProperties.getUploadRootPath() + type + File.separator + date + File.separator + fileName).getCanonicalFile();

            if (!dest.getParentFile().exists()) {
                dest.getParentFile().mkdirs();
            }
            multipartFile.transferTo(dest);

        } catch (Exception e) {
            e.printStackTrace();
            throw new BusinessException(e.getMessage());
        }

        FileUploadDto uploadDto = new FileUploadDto();
        uploadDto.setOriginName(originalFilename);
        uploadDto.setFileName(fileName);
        uploadDto.setRealUrl(dest.getPath());
        uploadDto.setFileUrl(fileProperties.getRealUrl() + dest.getPath());
        uploadDto.setFileType(FileUtil.getType(dest));
        uploadDto.setStorageType(FileStorageEnums.LOCAL.getCode());
        uploadDto.setFileSize(size);

        uploadDto.setMd5(getMD5(multipartFile) + "." + uploadDto.getFileType());

        if (IMAGE_SUFFIX_LIST.contains(uploadDto.getFileType())) {
            BufferedImage img = null;
            try {
                img = ImageIO.read(dest);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (img != null && img.getWidth() >= 0 && img.getHeight() >= 0) {
                uploadDto.setWidth(img.getWidth());
                uploadDto.setHeight(img.getHeight());
            }
        } else if (FileService.videoSuffixList.contains(uploadDto.getFileType())) {
            try {
                long duration = VideoUtil.getDuration(uploadDto.getRealUrl());
                uploadDto.setDuration((int) (duration * 1000));
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            try {
                InputStream inputStream = multipartFile.getInputStream();
                String screenShot = fileProperties.getUploadRootPath() + uploadDto.getFileType()
                        + File.separator + date + File.separator + "screenShot" + uuidStr + ".jpg";
                String thumbnailForVideo = fileToThumbnail.getThumbnailForVideo(inputStream, screenShot);
                uploadDto.setScreenShot(fileProperties.getRealUrl() + thumbnailForVideo);
                inputStream.close();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }

        return uploadDto;
    }


    /**
     * 获取上传文件的MD5值
     *
     * @param file
     * @return
     */
    public String getMD5(MultipartFile file) {

        try {
            byte[] uploadBytes = file.getBytes();
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            byte[] digest = md5.digest(uploadBytes);
            String hashString = new BigInteger(1, digest).toString(16);
            if (hashString.length() % 2 != 0) {
                hashString = "0" + hashString;
            }
            return hashString;
        } catch (Exception e) {
        }
        return null;
    }
}