package edu.whut.smilepicturebackend.manager.upload;

import cn.hutool.core.io.FileUtil;
import edu.whut.smilepicturebackend.exception.ErrorCode;
import edu.whut.smilepicturebackend.exception.ThrowUtils;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.util.Arrays;
import java.util.List;

/**
 * 文件图片上传
 */
@Service
public class FilePictureUpload extends PictureUploadTemplate {

    @Override
    protected void validPicture(Object inputSource) {
        MultipartFile multipartFile = (MultipartFile) inputSource;
        ThrowUtils.throwIf(multipartFile == null, ErrorCode.PARAMS_ERROR, "文件不能为空");
        // 1. 校验文件大小
        long fileSize = multipartFile.getSize();
        final long ONE_M = 1024 * 1024;
        ThrowUtils.throwIf(fileSize > 2 * ONE_M, ErrorCode.PARAMS_ERROR, "文件大小不能超过 2MB");
        // 2. 校验文件后缀
        String fileSuffix = FileUtil.getSuffix(multipartFile.getOriginalFilename());
        ThrowUtils.throwIf(fileSuffix == null, ErrorCode.PARAMS_ERROR, "文件后缀缺失");
        // 允许上传的文件后缀列表（或者集合）
        final List<String> ALLOW_FORMAT_LIST = Arrays.asList("jpeg", "png", "jpg", "webp");
        // 统一转成小写再比较
        ThrowUtils.throwIf(
                !ALLOW_FORMAT_LIST.contains(fileSuffix.toLowerCase()),
                ErrorCode.PARAMS_ERROR, "文件类型错误");
    }

    @Override
    protected String getOriginFilename(Object inputSource) {
        MultipartFile multipartFile = (MultipartFile) inputSource;
        return multipartFile.getOriginalFilename();
    }

    @Override
    protected void processFile(Object inputSource, File file) throws Exception {
        MultipartFile multipartFile = (MultipartFile) inputSource;
        multipartFile.transferTo(file);
    }
}