const express = require('express');
const { exec } = require('child_process');

require('dotenv').config();

const phonesCfg = require('./phones.json');
const buttonsCfg = require('./buttons.json');
const fs = require('fs');
const path = require('path');

if (!fs.existsSync(path.join(__dirname, 'slingtoken.txt'))) {
	// Create empty file
	fs.writeFileSync(path.join(__dirname, 'slingtoken.txt'), '', 'utf8');
	console.warn('slingtoken.txt file created. Please add your Sling token to this file to use sling messaging!');
}

var slingToken = fs.readFileSync(path.join(__dirname, 'slingtoken.txt'), 'utf8').trim();
const contexts = {};

// Generate contexts from buttonsCfg
Object.keys(buttonsCfg).forEach(category => {
    buttonsCfg[category].forEach(button => {
        if (button.name && button.context) {
            contexts[button.name] = {
                context: button.context.context,
                timeout: button.context.timeout,
                cid: button.context.cid,
                ...(button.context.dial && { dial: button.context.dial }),
				...(button.sling_chat_id && { sling_chat_id: button.sling_chat_id }),
				...(button.sling_chat_message && { sling_chat_message: button.sling_chat_message })
            };
        }
    });
});

//console.log('Generated contexts:', contexts);

function trigCall(pageType, phone) {
	// If contexts[pageType] does not exist, return an error
	if (!contexts[pageType]) {
		throw new Error(`Invalid page type: ${pageType}`);
	}
	const { context, timeout, cid, dial, sling_chat_id, sling_chat_message } = contexts[pageType];
	const targetNumber = dial || phone;
	if (!targetNumber) {
		throw new Error(`Phone number is required for page type: ${pageType}`);
	}

	// Slink chat notification
	if (sling_chat_id && sling_chat_message) {
		fetch(`https://api.getsling.com/v1/conversations/${sling_chat_id}/messages`, {
			method: 'POST',
			headers: {
				'Authorization': `${slingToken}`,
				'Content-Type': 'application/json'
			},
			body: JSON.stringify({
				'content': sling_chat_message
			})
		}).then(res => res.json()).then(data => {
			if (data && data.success) {
				console.log('Sling chat message sent successfully.');
			} else {
				console.error('Error sending Sling chat message:', data);
			}
		});
	}

	originateCall(targetNumber, context, 0, timeout, cid).then((output) => {
		console.log(`Call originated: ${output}`);
	}).catch((error) => {
		console.error(`Error originating call: ${error}`);
	});
	return true;
}

function originateCall(number, context, delay, timeout, cid, variables = {}) {
	// Build the base command
	let command = `/usr/bin/ast_originate ${number} ${context} ${delay} ${timeout} ${Buffer.from(cid).toString('base64')}`;
	
	// Add variables if provided
	if (variables && typeof variables === 'object') {
		const varString = Object.entries(variables)
			.map(([key, value]) => `${key}=${value}`)
			.join(' ');
		if (varString) {
			command += ` ${varString}`;
		}
	}
	
	return new Promise((resolve, reject) => {
		exec(command, (error, stdout, stderr) => {
			if (error) {
				reject(error);
			} else {
				resolve(stdout);
			}
		});
	});
}


// Sling chat stuff; Check current token with GET https://api.getsling.com/v1/account/session, refresh with POST https://api.getsling.com/v1/account/session (GET NEW TOKEN FROM RETURN AUTHORIZATION HEADER)
async function slingAuthLoop() {
	console.log("Start slingAuthLoop")
	if (!slingToken) {
		console.warn('No Sling token provided in environment variables.');
		return;
	}
	setTimeout(slingAuthLoop, 15 * 60 * 1000); // Refresh every 15 minutes
	const sessionCheck = await fetch('https://api.getsling.com/v1/account/session', {
		method: 'GET',
		headers: {
			'Authorization': `${slingToken}`
		}
	});
	console.log(sessionCheck)
	if (sessionCheck && sessionCheck.ok) {
		console.log('Sling session is valid. Refreshing token...');
		const sessionRefresh = await fetch('https://api.getsling.com/v1/account/session', {
			method: 'POST',
			headers: {
				'Authorization': `${slingToken}`
			}
		});
		const newToken = sessionRefresh.headers.get('Authorization');
		if (newToken) {
			slingToken = newToken;
			fs.writeFileSync(path.join(__dirname, 'slingtoken.txt'), newToken, 'utf8');
			console.log('Sling token refreshed.');
		}
	} else {
		console.error('Sling session is invalid. Please get a new token manually!');
	}
}

slingAuthLoop();

const app = express();
const HOST = process.env.HOST || 'localhost';
const PORT = process.env.PORT || 3000;

app.use(express.json());
app.set('view engine', 'ejs');
app.set('views', './views');
app.use(express.static('static'));
app.use(express.urlencoded({ extended: true }));
app.use(require('express-session')({
	secret: process.env.SESSION_SECRET || 'fallback-secret-key',
	resave: false,
	saveUninitialized: false,
	cookie: { secure: false, maxAge: 24 * 60 * 60 * 1000 }
}));

function auth(req, res, next) {
	if (!req.session || !req.session.authenticated) {
		return res.redirect('/login');
	}
	next();
}

app.get('/', (req, res) => {
	res.render('index', { session: req.session, phones: phonesCfg, buttons: require("./buttons.json") });
});

app.get('/login', (req, res) => {
	res.render('login', { session: req.session });
});

app.post('/trig', async (req, res) => {
	console.log('Triggering call with data:', req.body);
	trigCall(req.body.pageType, req.body.phone);
	res.status(200).send('Call triggered');
});

app.post('/stop', async (req, res) => {
	console.log('Stopping page for phone:', req.body.phone);
	// Logic to stop the page would go here. 
    // For now we will just log it, as the specific asterisk command to hangup a channel depends on implementation details not provided.
    // Typically it might involve 'asterisk -rx "channel request hangup <channel>"' or similar via AMI.
    // Assuming we might want to run a command similar to originate but for hangup if we knew the channel.
    // Since we don't have the channel ID easily available without tracking it, we might need to implement channel tracking or use a broad command.
	exec(`/usr/bin/ast_drop ${process.env.PAGE_GROUP || '9000'}`, (error, stdout, stderr) => {
		if (error) {
			console.error(`Error stopping page: ${error}`);
			return res.status(500).send('Error stopping page');
		}
		console.log(`Page stopped: ${stdout}`);
	});
    
	res.status(200).send('Stop request received');
});

app.listen(PORT, HOST, () => {
	console.log(`Server running on http://${HOST}:${PORT}`);
});