// Load required modules
// note that for WebXR, e.g SpaSca, https is required, even if using own certifcate
	// see how it's done for offline NAF
const http = require("http");                 // http server core module
const path = require("path");
const express = require("express");           // web framework external module
const {execSync}  = require('child_process');

// Get port or default to 8080
const port = process.env.PORT || 8082;

// Setup and configure Express http server.
const app = express();
app.use(express.static(path.resolve(__dirname, ".", "examples")));

const instructions = `
/home/deck/.ssh/
	trusted context, i.e on closed WiFi and over https, still. could check as bearer
/home/deck/.ssh/config
	could limit to known IP range or class e.g cat .ssh/config | grep 192.168.4. -C 3
	could also re-add new entries rather than extend the format
/home/deck/.ssh/authorized_keys
/home/deck/.ssh/known_hosts
/home/deck/.ssh/id_rsa_steamdeck
/home/deck/.ssh/id_rsa_steamdeck.pub

/home/deck/server.locatedb
		seems to be plain text with metadata
/home/deck/desktop.plocate.db
		seems to be a specific format, binary or maybe compressed
	both should be queriable via http with json output

ssh remarkable2 to get drawing preview
	conversion should be done, if necessary, on device
	for typed text
		cat 43*.rm | sed "s/[^a-zA-z0-9 ]//g" | sed "s/[OT,EC]//g"

util functions
	modify WiFi parameters, including AP if available
	shutdown/reboot
`
app.get('/pwa', (req, res) => {
	// for offline use on mobile or VR headset
		// should try to sync back when devices connect back
			// same when itself connects back to (Internet) own server e.g benetou.fr
			// can be cascading or federatede or properly P2P
	// responsive programming also, not "just" design
	res.redirect('pwa/index.html')
})
const utilsCmd = {
	'shutdown' : { cmd: 'shutdown -h now' },
	'listprototypes': { cmd: 'ls', context: {cwd: '/home/deck/Prototypes'},
		// more reliably path.join(__dirname,'')
		format: res => res.toString().split('\n')
	},
}
app.get('/exec', (req, res) => {
	if (!req.query.cmdName){
		res.json(utilsCmd)
	} else {

		let resultFromExecution = execSync(utilsCmd[req.query.cmdName].cmd, utilsCmd[req.query.cmdName].context) 
		let formatter = utilsCmd[req.query.cmdName].format
		if (formatter) resultFromExecution = formatter(resultFromExecution)
		res.json( resultFromExecution )
	}
})
// app.get('/interface/unregister', (req, res) => {
// app.get('/interface/register', (req, res) => {
// could be use for e.g reMarkable2, Quest2, etc with specifically accepted or prefered formats
app.get('/services/unregister', (req, res) => {
	res.json( {msg: 'not yet implemented'})
})
app.get('/services/register', (req, res) => {
	res.json( {msg: 'not yet implemented'})
	// example {name:'hmdlink', desc:'share URL between local devices', protocol:'http', port:8082, path: '/hmdlink', url:'http://192.168.4.3:8082/hmdlink'},
})
app.get('/services', (req, res) => {
	// could be probbed first to check for availability
	// should be updated also via register/unregister
	res.json( [
		{name:'kiwix', desc:'offline Wikipedia, Stackoverflow, etc', protocol:'http', port:8080, url:'http://192.168.4.3:8080'},
		{name:'hmdlink', desc:'share URL between local devices', protocol:'http', port:8082, path: '/hmdlink', url:'http://192.168.4.3:8082/hmdlink'},

	] )
})

let dynURL = 'https://192.168.4.1/offline.html'
app.get('/hmdlink/set', (req, res) => { // could be a PUT instead
	// e.g http://192.168.4.3:8082/hmdlink/set?url=http://192.168.4.3:8082/114df5f8-3921-42f0-81e7-48731b563571.thumbnails/f07120ba-0ca1-429d-869f-c704a52b7aa3.png
	dynURL = req.query.url 
	res.redirect( dynURL )
})
app.get('/hmdlink', (req, res) => {
	res.redirect( dynURL )
})
app.get('/json', (req, res) => {
	res.json( instructions.split('\n') )
})
app.get('/', (req, res) => {
	res.send( instructions )
})
app.get('/localprototypes', (req, res) => {
	res.json( spawn('find Prototypes/ -iwholename */.git/config | xargs grep git.benetou.fr') )
})

const https = require("https");
const fs = require("fs");
const privateKey = fs.readFileSync("naf-key.pem", "utf8");
const certificate = fs.readFileSync("naf.pem", "utf8");
const credentials = { key: privateKey, cert: certificate };

const webServer = https.createServer(credentials, app);
// Start Express http server
// const webServer = http.createServer(app);
// Listen on port
webServer.listen(port, () => {
    console.log("listening on http://localhost:" + port);
});