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 umlautMapGermany = {
	'\u00dc': ']',
	'\u00c4': '[',
	'\u00d6': "\\",
	'\u00fc': '}',
	'\u00e4': '{',
	'\u00f6': '|',
	'\u00df': '~',
}
const umlautMapIntl = {
	'\u00dc': 'U',
	'\u00c4': 'A',
	'\u00d6': 'O',
	'\u00fc': 'u',
	'\u00e4': 'a',
	'\u00f6': 'o',
	'\u00df': 'ss',
}

function itnlUmlaute(str) {
	let umlautMap = umlautMapIntl
  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) => umlautMapIntl[a]
    );
}
function replaceUmlaute(str) {
	let umlautMap = config.germanUmlautSupport
		? umlautMapGermany
		: umlautMapIntl
  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(preset, payload) {
	console.log(preset, payload)
	try {

	await axios.post(new URL(config.pager.url).origin + '/api/message/' + (!!preset ? 'preset' : 'advanced'), Object.assign( !!preset
		? { preset }
		: { ...config.pager.params } // backward compatibility
	, { payload: payload }))

} catch (e) {}
}

function analyzeCategory(txt) {
	//console.log('analyzing text', txt)
	
	if (txt.indexOf('WINDBOEN')>-1) return 'wind_storm'
	if (txt.indexOf('STURMBOEN')>-1) return 'wind_storm'
	if (txt.indexOf('ORKANBOEN')>-1) return 'wind_storm'

	if (txt.indexOf('STARKREGEN')>-1) return 'rain1'
	if (txt.indexOf('DAUERREGEN')>-1) return 'rain2'

	if (txt.indexOf('GEWITTER')>-1) return 'thunderstorm'

	if (txt.indexOf('SCHNEE')>-1) return 'snow'
	if (txt.indexOf('FROST')>-1) return 'frost'
	if (txt.indexOf('GLATTE')>-1) return 'ice'
	if (txt.indexOf('NEBEL')>-1) return 'fog'
	return 'none'
}
function analyzeLevel(txt) {
	if (txt.indexOf('STUFE 1 VON ')>-1) return 1
	if (txt.indexOf('STUFE 2 VON ')>-1) return 2
	if (txt.indexOf('STUFE 3 VON ')>-1) return 3
	if (txt.indexOf('STUFE 4 VON ')>-1) return 4
	return 0
}

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
				const msgCategory = analyzeCategory(itnlUmlaute(msg.toUpperCase()))
				const msgLevel = analyzeLevel(itnlUmlaute(msg.toUpperCase()))
				//console.log('type', msgCategory, 'level', msgLevel)
				const msgLevelTrigger = !!region.levels[msgCategory]
					? region.levels[msgCategory]
					: 0
				//console.log(msgLevelTrigger, 'is the trigger level for', msgCategory)
				if (msgLevel >= msgLevelTrigger) { } else continue // ignore the stuff we want to ignore
				msg = msg.replace('DWD UNWETTERWARNUNG:', 'DWD:')
				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) {
						if (msg.indexOf('Es sind keine Warnungen') > -1) {
							if (!!region.ignoreEOW) continue
						}
						await sendPage( region.preset, 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( region.preset, 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({ limit: '1mb' }))
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.get('/api/deliveryPresets', async (req, res) => {
    const presets = await axios.get(new URL(config.pager.url).origin + '/api/deliveryPresets')
    return res.json(presets.data)
})
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')