const express = require('express');
const app = express.Router();

const sqlite = require('better-sqlite3');
const db = new sqlite('the_big_db.db', { verbose: console.log });

const argon2 = require('argon2');

const { loginRequired } = require('../authStuff.js');

// auth stuff
app.post('/register', async (req, res) => {
	const {name, password, nonce} = req.body;

	const oldUser = db.prepare('select name from users where name=?').get(name);
	if (oldUser) return res.status(500).json({"error": "user name already in use"});

	// check if the nonce password is correctt
	if (nonce != "a softer birdsong") return res.status(500).json({"error": "wrong nonce"});

	try {
		// i'm told argon2 is the good one nowatimes
		const hash = await argon2.hash(password);
		const inserted = db.prepare('insert into users (name, password) values (?, ?)').run(name, hash);
		res.status(200).json(inserted);
	} catch (error) {
		res.status(500).json({"error": error});
	}
});

app.post('/login', async (req, res) => {
	if (req.session.name) {
		return res.status(200).json({message: "already logged in", name: req.session.name});
	}

	const {name, password} = req.body;

	// fetch username and passswords from the db
	const storedUser = db.prepare('select * from users where name = ?').get(name);
	if (!storedUser) {
		return res.status(401).json({"error": "password/username combo not found in database"});
	}

	//check if the passss hashes mattch and log in
	if (!(await argon2.verify(storedUser.password, password))) {
		return res.status(401).json({"error": "password/username combo not found in database"});
	}
	
	// set the session cookie and rreturn 200!
	req.session.name = name;
	req.session.userId = storedUser.id;
	console.log('setting req.session.name! : ', req.session);
	return res.status(200).json({message: "successfully logged in!", id: storedUser.id, name: name});
});

app.post('/logout', (req, res) => {
	req.session.destroy();
	res.status(200).json({message: "successfully logged out"});
});

app.get('/user', loginRequired, (req, res) => {
	res.status(200).json({
		"id": req.session.userId,
		"name": req.session.name,
		"favoriteColor": "red",
		"leastFavoriteColor": "also red"
	});
});

module.exports = app;