const express = require('express')
const bodyParser = require('body-parser')
const cookieParser = require('cookie-parser')
const crypto = require('crypto')
const fs = require('fs')
const util = require('util')
const bot = require('./apps/bot')

const app = express()

app.use(bodyParser.json())
app.use(cookieParser())

BigInt.prototype.toJSON = function () {
  return Number(this)
}

app.use((req, res, next) => {
	if(!(req.body instanceof Object)) 
		return next()

	const escapeHtml = str => str.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&#039;')
	Object
		.keys(req.body || {})
		.filter(key => typeof(req.body[key]) == 'string' && key != 'password')
		.map(key => req.body[key] = escapeHtml(req.body[key]))

	next()
})

// cors
app.use((req, res, next) => {
	res.set({
		'Access-Control-Allow-Origin': '*',
		'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE',
		'Access-Control-Allow-Headers': 'Accept,Accept-Language,Content-Language,Content-Type,Authorization,Cookie,X-Requested-With,Origin,Host',
		'Access-Control-Allow-Credentials': true
	})

	return req.method == 'OPTIONS' ? res.status(200).json({success: true}) : next()
})

app.post('(/api/admin/customer/login|/api/miniapp/user/login)', (req, res, next) => {
	const data = Object.assign({}, req.query)
	delete data.hash
	const hash = req.query?.hash
	
	const BOT_TOKEN = '7236504417:AAGVaodw3cRwGlf-jAhwnYb51OHaXcgpW8k'
	const dataCheckString = Object.keys(data).sort().map((key) => `${key}=${data[key]}`).join("\n")
	const secretKey = crypto.createHmac("sha256", "WebAppData").update(BOT_TOKEN).digest()
	const hmac = crypto.createHmac("sha256", secretKey).update(dataCheckString).digest("hex")

	const timeDiff = Date.now() / 1000 - data.auth_date

	if (hmac !== req.query.hash) // || timeDiff > 10) 
		throw Error('ACCESS_DENIED::401')

	const user = JSON.parse(req.query.user)
	res.locals.telegram_id = user.id
	res.locals.start_param = req.query.start_param

	if (!res.locals.telegram_id) 
		throw Error('ACCESS_DENIED::500')

	next()
})


app.use('/api/admin', require('./apps/admin'))
app.use('/api/miniapp', require('./apps/miniapp'))

app.use((err, req, res, next) => {
	console.error(`Error for ${req.path}: ${err}`)

	let message, code
	//if (err.code == 'SQLITE_ERROR' || err.code == 'SQLITE_CONSTRAINT_CHECK') {
	//	message = 'DATABASE_ERROR'
		//code = err.code == 'SQLITE_CONSTRAINT_CHECK' ? 400 : 500
	//} else {
		[message, code = 500] = err.message.split('::')
	//}
		
	res.status(res.statusCode == 200 ? 500 : res.statusCode).json({success: false, error: { message, code}})
})

app.use(express.static('public'))

const PORT = process.env.PORT || 3000
app.listen(PORT, async () => {
	console.log(`Listening at port ${PORT}`)
	bot.start(
		process.env.API_ID || 26746106,
		process.env.API_HASH || '29e5f83c04e635fa583721473a6003b5',
		process.env.BOT_TOKEN || '7236504417:AAGVaodw3cRwGlf-jAhwnYb51OHaXcgpW8k'
	)
})