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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com *//* eslint-env node *//* global Promise */const XLSX = require('xlsx');const SheetJSMongo = require("./SheetJSMongo");const MongoClient = require('mongodb').MongoClient;
const url = 'mongodb://localhost:27017/sheetjs';const db_name = 'sheetjs';
let P = Promise.resolve("sheetjs");
/* Connect to mongodb server */P = P.then(async () => {	const client = await MongoClient.connect(url,{ useUnifiedTopology: true });	return [client];});
/* Sample data table */P = P.then(async ([client]) => {	const db = client.db(db_name);
	try { await db.collection('pres').drop(); } catch(e) {}	const pres = db.collection('pres');	await pres.insertMany([		{ name: "Barack Obama", idx: 44 },		{ name: "Donald Trump", idx: 45 }	], {ordered: true});
	try { await db.collection('fmts').drop(); } catch(e) {}	const fmts = db.collection('fmts');	await fmts.insertMany([		{ ext: 'XLSB', ctr: 'ZIP', multi: 1 },		{ ext: 'XLS',  ctr: 'CFB', multi: 1 },		{ ext: 'XLML',             multi: 1 },		{ ext: 'CSV',  ctr: 'ZIP', multi: 0 },	], {ordered: true});
	return [client, pres, fmts];});
/* Export database to XLSX */P = P.then(async ([client, pres, fmts]) => {	const wb = XLSX.utils.book_new();	await SheetJSMongo.book_append_mongo(wb, pres, "pres");	await SheetJSMongo.book_append_mongo(wb, fmts, "fmts");	XLSX.writeFile(wb, "mongocrud.xlsx");	return [client, pres, fmts];});
/* Read the new file and dump all of the data */P = P.then(([client]) => {	const wb = XLSX.readFile('mongocrud.xlsx');	wb.SheetNames.forEach((n,i) => {		console.log(`Sheet #${i+1}: ${n}`);		const ws = wb.Sheets[n];		console.log(XLSX.utils.sheet_to_csv(ws));	});    return [client];});
/* Close connection */P.then(async ([client]) => { client.close(); });