const fs = require('fs')

const config = require('./config.json')

const io = require("socket.io-client")
const axios = require('axios')
const socket = io(new URL(config.pager.url).origin)

const { read } = require('feed-reader')

const stateMachine = {}
socket.on('msgmgr:event', async (eventType, eventData) => {
    console.log(eventType, eventData)
})

const umlautMap = {
  '\u00dc': 'U',
  '\u00c4': 'A',
  '\u00d6': 'O',
  '\u00fc': 'u',
  '\u00e4': 'a',
  '\u00f6': 'o',
  '\u00df': 'ss',
}

function replaceUmlaute(str) {
  return str
    .replace(/[\u00dc|\u00c4|\u00d6][a-z]/g, (a) => {
      const big = umlautMap[a.slice(0, 1)];
      return big.charAt(0) + big.charAt(1).toLowerCase() + a.slice(1);
    })
    .replace(new RegExp('['+Object.keys(umlautMap).join('|')+']',"g"),
      (a) => umlautMap[a]
    );
}

async function sendPage(payload) {
	console.log(payload)
	return (await axios.post(config.pager.url, Object.assign({ ...config.pager.params }, { payload })))
}
async function checkDWD() {
	for (region of config.regions) {
		if (!region.active) continue
		try {
			let rssData = await read('https://wettwarn.de/rss/' + region.dwdID + '.rss')
			let msg = ""
			rssData.entries.sort((a,b) => new Date(b.published).valueOf() - new Date(a.published).valueOf())
			if (rssData.entries.length > 0) {
				msg = rssData.entries[0].description
				msg = msg.replace('DWD WETTERWARNUNG:', 'DWD:')
				msg = msg.replace(' in ', ' ')
				msg = msg.replace(' von ', '/')
				msg = msg.indexOf('Quelle:') > -1
					? msg.split('Quelle:')[0]
					: msg
				msg = replaceUmlaute(msg)

				if (!!stateMachine[ region.dwdID ]) {
					if (stateMachine [ region.dwdID ] != msg) {
						await sendPage( msg )
						stateMachine [ region.dwdID ] = msg
					}
				} else {
					stateMachine [ region.dwdID ] = msg
					// if initial state is unknown and we have an alert, send it anyway
					if (msg.indexOf('Es sind keine Warnungen') == -1) {
						await sendPage( msg )
					}
				}
			}
		} catch (e) {console.error(e)}
	}
}
function main() {
  // listen
  setTimeout(checkDWD, 0)
  setInterval(checkDWD, 5 * 60 * 1e3)
}


main()





const express = require('express')
const appConfig = express()
appConfig.use(express.json())
appConfig.use(express.static('html'))
appConfig.use(express.static(__dirname + '/node_modules/@mdi/font'))

/** CONFIG Routes */

appConfig.get('/config', async (req, res) => {
    return res.json(JSON.parse(fs.readFileSync('config.json')))
})
appConfig.post('/config', async (req, res) => {
    if (!(!!req.body.pager)) return res.status(403).json(false)
    if (!(!!req.body.regions)) return res.status(403).json(false)
    console.log(req.body)
    fs.writeFileSync('config.json', JSON.stringify(req.body, null, "\t"))
    return res.json(true)
})
appConfig.post('/restart', (req, res) => {
    process.exit(1)
})

appConfig.listen(3050, '0.0.0.0' || config.host || '127.0.0.1')