function fileList(list) {
	if (list.length == 0) return [];
    let suffixList = {
            image: ['png', 'jpg', 'jpeg', 'bmp', 'gif', 'webp', 'svg', 'tiff'],
            video: ['mp4', 'ogg', 'webm'],
            word: ['doc', 'docx'],
            excel: ['xls', 'xlsx'],
            ppt: ['ppt', 'pptx'],
            txt: ['txt', 'md', 'js', 'json'],
            pdf: ['pdf'],
            rar: ['7z', 'zip', 'rar', 'kz', 'ace', 'arj', 'bz2', 'cab', 'gz', 'iso', 'jar', 'lzh', 'tar', 'z'],
            folder: ['"folder"']
        },
        typeList = [];
    for (let key in suffixList) typeList.push(key);
    for (let i = 0; i < list.length; i++) {
        list[i].fileType = 'unknown';
        list[i].cover = `/static/image/file/unknown.png`
        const suffix = list[i].postfix.toLowerCase();
        if (suffix != "folder") {
            for (let key in suffixList) {
                if (suffixList[key].some(value => value == suffix)) {
                    list[i].fileType = key;
                    if (key == 'image') {
                        list[i].cover = list[i].url;
                    } else if (typeList.includes(key)) {
                        list[i].cover = `/static/image/file/${key}.png`;
                    }
                }
            }
        } else {
            list[i].fileType = "folder";
            list[i].cover = `/static/image/file/folder.png`
        }
    }
    return list;
};

//得到缩略图或者压缩图  getType默认得到缩略图传true得到压缩图
function getSpecifiedImage(obj, getType = false) {
    let type = getType ? 'compressed' : 'thumbnail';
    let imgObj = obj.subfiles.find(v => v.type == type);
    return imgObj.url;
}

module.exports = {
    fileList,
    getSpecifiedImage
}