interface FileItem {
    fileId: string
    fileName: string
    byteCount: string
    sizeText: string
    extensionName: string
    type: string
    previewShow: boolean
    [key: string]: any
}
interface FileList {
    fileId: string
    fileName: string
    byteCount: number
    extensionName: string
    [key: string]: any
}
// 视频格式
const vidoeTypes = ['mp4', 'mov', 'avi', 'mkv', 'wmv', 'flv', 'mpeg', 'mpg', '3gp', 'webm']
// 文档格式
const docTypes = ['doc', 'docx', 'xls', 'xlsx', 'ppt', 'pptx', 'txt', 'rtf', 'pdf']
// 图像文件
const imageTypes = ['jpg', 'png', 'bmp', 'gif']

/**
 * @description: 文件类型是否支持预览
 * @param {string} extensionName 文件后缀
 * @return {boolean} 是否支持预览
 */
export const filePreviewShow = (extensionName: string) => {
    const suffix = extensionName.replace(/\./g, '').toLowerCase()
    if (vidoeTypes.includes(suffix)) {
        return true
    } else if (docTypes.includes(suffix)) {
        return true
    } else if (imageTypes.includes(suffix)) {
        return true
    } else {
        return false
    }
}

/**
 * @description: 文件类型
 * @param extensionName 文件后缀
 * @returns {string}
 */
export const fileType = (extensionName: string) => {
    const suffix = extensionName.replace(/\./g, '').toLowerCase()
    if (vidoeTypes.includes(suffix)) {
        return 'video'
    } else if (docTypes.includes(suffix)) {
        return 'doc'
    } else if (imageTypes.includes(suffix)) {
        return 'image'
    } else {
        return 'other'
    }
}

/**
 * @description: 文件大小格式化
 * @param size 文件后缀
 * @returns {string}
 */
export const fileSizeFormat = (size: number) => {
    const units = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']
    let i = 0
    while (size >= 1024) {
        size /= 1024
        i++
    }
    return `${size.toFixed(2)} ${units[i]}`
}

/**
 * @description: 文件列表格式化
 * @param fileList 文件列表
 * @returns {FileItem[]}    文件列表
 */
export const fileListFormat = (fileList: FileList) => {
    const result: FileItem[] = []
    for (let i = 0; i < fileList.length; i++) {
        const file = fileList[i]
        const { fileId, fileName, byteCount, extensionName } = file
        const type = fileType(extensionName)
        const previewShow = filePreviewShow(extensionName)
        result.push({
            fileId,
            fileName,
            sizeText: fileSizeFormat(byteCount),
            byteCount,
            type,
            previewShow,
            extensionName
        })
    }
    return result
}