app.py

#=======================IMPORT REQUIRED MODELS=========================

from flask import Flask, render_template, request, redirect, session
from flask_sqlalchemy import SQLAlchemy
import bcrypt
from datetime import datetime


#==================CREATE APP (CONFIGURATION) AND DATABASE=============


app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = "sqlite:///todo.db"
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
db = SQLAlchemy(app)
app.secret_key = "71d5195725f8844d7f4e50ba11045a940cf0c5d2b2aaea0a08a2307b3d4678c2"


#===========================DATA MODELS=============================

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(100), nullable=False)
    email = db.Column(db.String(200), nullable=False, unique=True)
    password= db.Column(db.String(200), nullable=False)

    def __init__(self, name, email, password):
        self.name = name
        self.email = email
        self.password = bcrypt.hashpw(password.encode('utf-8'), bcrypt.gensalt()).decode('utf-8')

    def check_password(self, password):
        return bcrypt.checkpw(password.encode('utf-8'), self.password.encode('utf-8'))
    

class Todo(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(200), nullable=False)
    date= db.Column(db.DateTime, default=datetime.utcnow)
    user_id = db.Column(db.Integer, db.ForeignKey("user.id"))


with app.app_context():
    db.create_all()


#==================== REDIRECT ROUTE=====================

@app.route('/')
def index():
    if 'user_id' in session:
        return redirect('/home')
    return redirect('/login')


#==================== AUTHORIZATION ROUTES===========================


@app.route('/register', methods=['GET', 'POST'])
def register():
    if request.method == 'POST':
        name = request.form['name']
        email = request.form['email']
        password = request.form['password']

        new_user = User(name=name, email=email, password=password)
        db.session.add(new_user)
        db.session.commit()
        return redirect('/login')

    return render_template('register.html')

@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        email = request.form['email']
        password = request.form['password']

        user = User.query.filter_by(email=email).first()
        if user and user.check_password(password):
            session['user_id'] = user.id
            session['name'] = user.name
            session['email'] = user.email
            return redirect('/home')
        else:
            return render_template('login.html', error="Invalid user")

    return render_template('login.html')

@app.route('/logout')
def logout():
    session.clear()
    return redirect('/login')


#=====================PAGE ROUTES=============================

@app.route('/home', methods=['GET', 'POST'])
def home():
    if 'user_id' not in session:
        return redirect('/')

    if request.method == 'POST':
        title = request.form['title']

        todo = Todo(title=title, user_id=session['user_id'])
        db.session.add(todo)
        db.session.commit()

    user = User.query.filter_by(email=session['email']).first()
    todos = Todo.query.filter_by(user_id = session['user_id']).all()
    return render_template('index.html', todos=todos, user=user)
    
    
#==================OPERATION ROUTES======================

@app.route('/update/<int:id>', methods=['GET', 'POST'])
def update(id):
    if request.method == 'POST':
        title = request.form['title']

        todo = Todo.query.filter_by(id=id).first()
        todo.title = title
        db.session.add(todo)
        db.session.commit()
        return redirect('/')

    todo = Todo.query.filter_by(id=id).first()
    return render_template('update.html', todo=todo)

@app.route('/delete/<int:id>')
def delete(id):
    todo = Todo.query.filter_by(id=id).first()
    db.session.delete(todo)
    db.session.commit()
    return redirect('/')

if __name__ == "__main__":
    app.run(debug=True, use_reloader=False, port=2711)