package com.monkeylessey.file.utils;

import com.monkeylessey.constant.HttpStatusConstants;
import com.monkeylessey.enums.FileTypeEnum;
import com.monkeylessey.enums.general.FileUploadTypeEnum;
import com.monkeylessey.exception.FileFormatNotSupport;
import com.monkeylessey.file.domain.entity.FileInfo;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.multipart.MultipartFile;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

/**
 * @author 29443
 * @version 1.0
 * @date 2022/4/25
 */
public class FileUtil {

    /**
     * 获取文件后缀
     *
     * @param fileName
     * @return
     */
    public static String getSuffix(String fileName) {
        String suffix = fileName.substring(fileName.lastIndexOf('.') + 1);
        return suffix;
    }

    /**
     * 获取该文件上传到oss哪个目录
     *
     * @param suffix 文件后缀
     * @return
     */
    public static String getFileType(String suffix) {
        String fileType = "";
        for (FileTypeEnum type : FileTypeEnum.values()) {
            if (type.getSuffixs().contains(suffix)) {
                fileType = type.getType();
                return fileType;
            }
        }
        if (StringUtils.isBlank(fileType)) {
            throw new FileFormatNotSupport("文件格式" + suffix + "不支持", HttpStatusConstants.ERROR);
        }
        return fileType;
    }

    /**
     * 获取文件的信息，调用此方法默认普通上传
     *
     * @param file
     * @return
     */
    public static FileInfo getFileInfo(MultipartFile file) {
        String originalFilename = file.getOriginalFilename();
        String random = generateFileKey();
        String suffix = getSuffix(originalFilename);
        String fileType = getFileType(suffix);
        String fileKey = String.format("%s/%s.%s", fileType, random, suffix);

        FileInfo fileInfo = new FileInfo();
        fileInfo.setFileKey(fileKey);
        fileInfo.setOriginalFilename(originalFilename);
        fileInfo.setContentType(file.getContentType());
        fileInfo.setSize(file.getSize());
        fileInfo.setUploadType(FileUploadTypeEnum.COMMON);

        return fileInfo;
    }

    /**
     * 获取文件的信息，传入上传类型
     *
     * @param file
     * @return
     */
    public static FileInfo getFileInfoWithUploadType(MultipartFile file, FileUploadTypeEnum uploadType) {
        FileInfo fileInfo = getFileInfo(file);
        fileInfo.setUploadType(uploadType);
        return fileInfo;
    }

    /**
     * 获取fileKey
     *
     * @return
     */
    public static String generateFileKey() {
        SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");
        String no = format.format(new Date());
        Random random = new Random();
        for (int i = 0; i < 8; i++) {
            no += random.nextInt(10);
        }
        return no;
    }

}