'use strict';

const szjcomoutils 	= require('szjcomo-utils');
const fs 			= require('fs');
const path 			= require('path');
const xml2js 		= require('xml2js');
const crypto 		= require('crypto');
const BAR 			= Symbol('Application#szjcomo');
const mime 			= require('mime');
/**
 * [mkdir 创建目录]
 * @author 	   szjcomo
 * @createTime 2020-09-04
 * @param      {[type]}   dirname [description]
 * @param      {Object}   options [description]
 * @return     {[type]}           [description]
 */
const mkdir = function(dirpath,options = {recursive:true}) {
    if (fs.existsSync(dirpath)) {
      	return true;
    } else {
		return fs.mkdirSync(dirpath,options);
	}
}
/**
 * [deleteFile 删除文件]
 * @author 	   szjcomo
 * @createTime 2020-09-04
 * @param      {[type]}   filename [description]
 * @return     {[type]}            [description]
 */
const deleteFile = function(filename) {
    if (!fs.existsSync(filename)) {
      	return true;
    } else {
		fs.unlinkSync(filename);
		return true;
	}
}
/**
 * [fileSize 获取文件或文件夹大小]
 * @author 	   szjcomo
 * @createTime 2020-09-04
 * @param      {[type]}   filepath [description]
 * @return     {[type]}            [description]
 */
const fileSize = function(filepath) {
    if (!fs.existsSync(filepath)) {
      	return 0;
    } else {
		return fs.statSync(filepath).size;
	}
}
/**
 * [parseXml xml解析]
 * @author 	   szjcomo
 * @createTime 2020-09-04
 * @param      {[type]}   xmlContent [description]
 * @return     {[type]}              [description]
 */
const parseXml = function(xmlContent) {
    return new Promise((resolve, reject) => {
        const parseString = xml2js.parseString;
        parseString(xmlContent, { explicitArray: false }, (err, json) => {
            if (json) {
                resolve(json.xml);
            } else {
                reject(err);
            }
        });
    });
}
/**
 * [createXml 对象转xml]
 * @author 	   szjcomo
 * @createTime 2020-09-04
 * @param      {[type]}   obj [description]
 * @return     {[type]}       [description]
 */
const createXml = function(obj) {
    const builder = new xml2js.Builder({
        rootName: 'xml',
        headless: true,
        cdata: true,
    });
    return builder.buildObject(obj);
}
/**
 * [MD5 原生nodejs的md5算法]
 * @author 	   szjcomo
 * @createTime 2020-09-04
 * @param      {[type]}   str [description]
 */
const MD5 = function(str) {
	return crypto.createHash('md5').update(str).digest('hex').toLowerCase();
}
/**
 * [SHA1 获取加密的sha1的值 基于nodejs]
 * @author 	   szjcomo
 * @createTime 2020-09-04
 * @param      {[type]}   str [description]
 */
const SHA1 = function(str) {
	return crypto.createHash('sha1').update(str).digest('hex').toLowerCase();
}
/**
 * [FileMD5 文件的md5值]
 * @author 	   szjcomo
 * @createTime 2020-09-04
 * @param      {[type]}   filepath [description]
 */
const FileMD5 = function(filename) {
	if(!fs.existsSync(filename)) throw new Error(`${filename}不存在`);
	var buffer = fs.readFileSync(filename);
	return crypto.createHash('md5').update(buffer).digest('hex').toLowerCase();
}
/**
 * [FileSHA1 文件的sha1值]
 * @author 	   szjcomo
 * @createTime 2020-09-04
 * @param      {[type]}   filename [description]
 */
const FileSHA1 = function(filename) {
	if(!fs.existsSync(filename)) throw new Error(`${filename}不存在`);
	var buffer = fs.readFileSync(filename);
	return crypto.createHash('sha1').update(buffer).digest('hex').toLowerCase();
}
/**
 * [deleteFolder 删除文件夹]
 * @author    szjcomo
 * @date   		2020-11-10
 * @param  {[type]}     folder_path [description]
 * @return {[type]}                 [description]
 */
const deleteFolder = function(folder_path) {
	let files = [];
	if( fs.existsSync(folder_path) ) {
	    files = fs.readdirSync(folder_path);
	    files.forEach(function(file,index){
	        let curPath = path.join(folder_path,file);
	        if(fs.statSync(curPath).isDirectory()) { // recurse
	            deleteFolder(curPath);
	        } else { // delete file
	            fs.unlinkSync(curPath);
	        }
	    });
	    fs.rmdirSync(folder_path);
	}
}
/**
 * [FileToBase64 文件转base64]
 * @author    szjcomo
 * @date   		2020-11-11
 * @param  {[type]}     filename [description]
 */
const FileToBase64 = function(filename) {
	if(!fs.existsSync(filename)) throw new Error('文件不存在');
	let bitmap 		= fs.readFileSync(filename);
	let data = Buffer.from(bitmap, 'binary').toString("base64");
	let base64 = 'data:' + mime.getType(filename) + ';base64,' + data;
	return base64;
}

/**
 * [getBase64FileType 获取base64文件的类型]
 * @author    szjcomo
 * @date   		2020-11-11
 * @param  {[type]}     filetype [description]
 * @return {[type]}              [description]
 */
const getBase64FileType = function(filetype) {
	let result;
	let maps = {
		'data:application/msword;base64,':'.doc',
		'data:application/vnd.openxmlformats-officedocument.wordprocessingml.document;base64,':'.docx',
		'data:application/vnd.ms-excel;base64,':'.xls',
		'data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64,':'.xlsx',
		'data:application/pdf;base64,':'.pdf',
		'data:application/vnd.ms-powerpoint;base64,':'.ppt',
		'data:application/vnd.openxmlformats-officedocument.presentationml.presentation;base64,':'.pptx',
		'data:text/plain;base64,':'.txt',
		'data:image/png;base64,':'.png',
		'data:image/jpeg;base64,':'.jpg',
		'data:image/svg+xml;base64,':'.svg',
		'data:image/x-icon;base64,':'.ico',
		'data:image/bmp;base64,':'.bmp',
		'data:application/json;base64,':'.json',
		'data:text/markdown;base64,':'.md',
		'data:application/javascript;base64,':'.js'
	};
	return maps[filetype]?maps[filetype]:null;
}
/**
 * [Base64ToFile base64字符串转文件]
 * @author    szjcomo
 * @date   		2020-11-11
 * @param  {[type]}     base64   [description]
 * @param  {[type]}     savePath [description]
 * @param  {[type]}     filename [description]
 */
const Base64ToFile = function(base64,savePath,filename = null) {
	let reg = /data:(.*);base64,/;
	let result = reg.exec(base64);
	if(!result || !result[0]) throw new Error('不是标准的base64格式');
	if(!savePath) throw new Error('文件保存路径参数未设置,请检查');
	if(!filename) {
		let ext = getBase64FileType(result[0]);
		if(!ext) throw new Error('未知的文件类型');
		filename = `${szjcomoutils.date('YmdHis')}${szjcomoutils.mt_rand(100000,999999)}${ext}`;	
	}
	let filepath = path.join(savePath,filename);
	mkdir(savePath);
	let filedata = base64.replace(/^data:(.*);base64,/,'');
	let buffer = Buffer.from(filedata, 'base64');
	fs.writeFileSync(filepath,buffer);
	if(fs.existsSync(filepath)) return filepath;
	return false;
}

/**
 * [exports 扩展app对象]
 * @type {Object}
 */
module.exports = {
	/**
	 * [szjcomo 获取对象]
	 * @author 	   szjcomo
	 * @createTime 2020-09-04
	 * @return     {[type]}   [description]
	 */
	get szjcomo() {
		if (!this[BAR]) {
			this[BAR] = Object.assign(szjcomoutils,{
				MD5:MD5,
				SHA1:SHA1,
				FileMD5:FileMD5,
				FileSHA1:FileSHA1,
				deleteFile:deleteFile,
				mkdir:mkdir,
				parseXml:parseXml,
				createXml:createXml,
				deleteFolder:deleteFolder,
				FileSize:fileSize,
				FileToBase64:FileToBase64,
				Base64ToFile:Base64ToFile
			});			
		}
		return this[BAR];
	}
};