sleep-tracker-backend/services/sessions/sessionsModel.js

const db = require('../../data/dbConfig');

module.exports = {
	addSession,
	findUserSessions,
	updateSession,
	removeSession
}

async function addSession(session) {
	const [id] = await db('sessions')
		.insert(session);

	const newSession = await findSessionById(id)
	computeSession(newSession);
	return newSession;
}

function findUserSessions(user_id) {
	return db
		.from("sessions")
		.where({ user_id });
}

function findSessionById(id) {
	return db('sessions')
		.where({ id })
		.first();
}

async function updateSession(id, changes) {
	await db('sessions')
		.where({ id })
		.update(changes, '*');
	const updatedSession = await findSessionById(id);
	computeSession(updatedSession);
	return updatedSession;
}

async function removeSession(id) {
	await db('sessions')
		.where({ id })
		.del();
}

async function computeSession(session) {
	if ( session.bed_tiredness && session.day_mood && session.wake_mood) {
		// Calculate the sleep duration
		let date1 = new Date(session.bed_time);
		let date2 = new Date(session.wake_time);
		let diffTime = Math.abs(date1.getTime() - date2.getTime());
		diffTime = diffTime/(1000*60*60);
		let sleep_duration = Math.round( diffTime * 100) / 100;
	
		// Calculate the average mood
		let average_mood = (session.bed_tiredness + session.wake_mood + session.day_mood) / 3;
		let new_average_mood = Math.round( average_mood * 100) / 100;
	
		await db('dailyAverages')
		.insert({
			session_id: session.id,
			user_id: session.user_id,
			sleep_duration: sleep_duration,
			average_mood: new_average_mood,
		})
		.catch(err => console.log(err));
	}
}