const express = require('express');
const bodyParser = require('body-parser');
const axios = require('axios');
const app = express();

const DEBUG_LOGGING = false;

const AUTH_SERVER_URL = 'http://localhost:8000';

const log = (string) => {
	date = new Date().toISOString().replace('T', ' ').split('.')[0];
	console.log(date, '-', string);
}

// Enums
const lockStates = {
	LOCK_OFF: 0,
	LOCK_PREARM: 1,
	LOCK_ARMED: 2,
	LOCK_ON_PRESSED: 3,
	LOCK_ON: 4,
};

let toolStatus = null;

const server = app.listen(8080, () => {
    log('Lockout socket server listening on port 8080!');
});
const io = require('socket.io')(server);

// Express http server stuff:

// TODO : remove on prod
app.use((req, res, next) => {
	res.header('Access-Control-Allow-Origin', '*');
	res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
	next();
});

app.use(bodyParser.json());

app.post('/api/lockout/:mac', (req, res) => {
	if (toolStatus) {
		const mac = req.params.mac;
		DEBUG_LOGGING && log(`${mac} - Lock state: ${Object.keys(lockStates)[req.body.lockState]}`);

		const tmp = Object.entries(toolStatus).find(x => x[1].mac == mac)
		const toolSlug = tmp ? tmp[0] : null;

		if (toolSlug) {
			let clearAction = false;
			let tool = toolStatus[toolSlug];
			tool.lastState = tool.state;

			switch (req.body.lockState) {
				case lockStates.LOCK_OFF:
					tool.state = 'off';
					if (tool.action == 'disarm') clearAction = true;
					break;
				case lockStates.LOCK_ARMED:
					tool.state = 'armed';
					if (tool.action == 'arm') clearAction = true;
					break;
				case lockStates.LOCK_ON:
					tool.state = 'on';
					break;
				default:
					break;
			}

			// Track in case state is switched from elsewhere
			if (tool.state != tool.lastState) clearAction = true;

			if (clearAction) {
				log(`${mac} - Report | Previous state: ${tool.lastState} | New state: ${tool.state} | Website action: ${tool.action || 'N/A'}`);

				tool.action = '';
				io.sockets.emit('toolStatus', toolStatus);
			}

			res.setHeader('Content-Type', 'application/json');
			res.send(JSON.stringify({ action: tool.action }));

			toolStatus[toolSlug] = tool;
		} else {
			res.sendStatus(404);
		}
	} else {
		res.sendStatus(503);
	}
});

app.get('*', (req, res) => {
	res.sendStatus(404);
});

// Socket.io websocket stuff:

// TODO : remove on prod
io.origins('*:*');

io.on('connection', socket => {
	socket.emit('toolStatus', toolStatus);

	socket.on('log', string => {
		log(string);
	});

	socket.on('requestInterlock', data => {
		const username = data.username;
		const token = data.token;
		const toolSlug = data.change.toolSlug;
		const action = data.change.action;

		log(`${username} - Request | Tool: ${toolSlug} | Action: ${action}`);

		axios.get(AUTH_SERVER_URL + '/user/', {
			headers: {'Authorization': 'Token ' + token},
		})
			.then(res => {
				const profile = res.data[0].profile || null;
				if (profile && profile.authorized_tools.includes(toolSlug)) {
					toolStatus[toolSlug].action = action;

					log(`${username} - Allowed | Tool: ${toolSlug} | Action: ${action}`);
					io.sockets.emit('toolStatus', toolStatus);
				} else {
					log(`${username} - DISALLOWED | Tool: ${toolSlug} | Action: ${action}`);
				}
			})
			.catch(err =>
				log(err.message)
			);
	});
});

setInterval(() => {
	axios.get(AUTH_SERVER_URL + '/tooldata/')
		.then(res => {
			toolStatus = res.data.categories
				.reduce((a, x) => a.concat(x.tools), [])
				.reduce((a, x) => ({...a, [x.slug]: a[x.slug] ? {
					...a[x.slug], mac: x.mac
				} : {
					mac: x.mac, action: '', state: 'off', lastState: 'n/a'
				}}), toolStatus || {});
			io.sockets.emit('toolStatus', toolStatus);
		})
		.catch(err =>
			log(err.message)
		);
}, 10000);