const express = require('express');
const cors = require('cors');
const app = express();
const child_process =require('child_process');

app.use(cors());

app.use(express.json());

const port = 8080;

app.listen(port, () => {
	console.log(`Server is running at http://localhost:${port}`);
});

// Set the pins 5,6,13,19 as output
child_process.exec('pinctrl set 5 op');
child_process.exec('pinctrl set 6 op');
child_process.exec('pinctrl set 13 op');
child_process.exec('pinctrl set 19 op');
child_process.exec('pinctrl set 19 pn dh');

app.use('/on/:gpio', function (req, res) {

	const gpio = req.params.gpio;
	const command = `pinctrl set ${gpio} pn dh`;

	child_process.exec(command, function (error, stdout, stderr) {
		if (error) {
			console.log(error);
			return res.status(500).send('Error');
		} else {
			console.log('LED ON', gpio);
			return res.status(200).send('LED ON');
		}
	});
});

app.use('/off/:gpio', function (req, res) {

	const gpio = req.params.gpio;
	const command = `pinctrl set ${gpio} dl`;

	child_process.exec(command, function (error, stdout, stderr) {
		if (error) {
			console.log(error);
			return res.status(500).send('Error');
		} else {
			console.log('LED OFF', gpio);
			return res.status(200).send('LED OFF');
		}
	});
});

app.use('/status/:gpio', function (req, res) {

	const gpio = req.params.gpio;
	const command = `pinctrl get ${gpio}`;
	const regex = new RegExp(/.*\| (..) \/.*/);

	child_process.exec(command, function (error, stdout, stderr) {

		if (error) {
			console.log(error);
			return res.status(500).send('Error');
		} else {
			const status = regex.exec(stdout)[1];

			console.log(stdout);
			return res.status(200).send(status);
		}
	});
});