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app.py
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app.py
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from flask import Flask, render_template, request, redirect, url_for, session
from flask_sqlalchemy import SQLAlchemy
from werkzeug.security import generate_password_hash, check_password_hash
import matplotlib
matplotlib.use('agg')
import matplotlib.pyplot as plt
import io
import base64
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///expenses.db'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.secret_key = 'your_secret_key' # Change this to a secure secret key
db = SQLAlchemy(app)
# Define Expense model
class Expense(db.Model):
id = db.Column(db.Integer, primary_key=True)
user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False) # Add user_id column
category = db.Column(db.String(100), nullable=False)
amount = db.Column(db.Float, nullable=False)
# Define User model
class User(db.Model):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(100), unique=True, nullable=False)
password = db.Column(db.String(100), nullable=False)
expenses = db.relationship('Expense', backref='user', lazy=True)
# Create the database tables within an application context
with app.app_context():
db.create_all()
# Route for user registration
@app.route('/register', methods=['GET', 'POST'])
def register():
if request.method == 'POST':
username = request.form['username']
password = request.form['password']
existing_user = User.query.filter_by(username=username).first()
if existing_user:
return render_template('register.html', error='Username already exists')
new_user = User(username=username, password=generate_password_hash(password))
db.session.add(new_user)
db.session.commit()
return redirect(url_for('login'))
return render_template('register.html')
# Route for user login
@app.route('/login', methods=['GET', 'POST'])
def login():
if request.method == 'POST':
username = request.form['username']
password = request.form['password']
user = User.query.filter_by(username=username).first()
if user and check_password_hash(user.password, password):
session['user_id'] = user.id
return redirect(url_for('home'))
else:
return render_template('login.html', error='Invalid username or password')
return render_template('login.html')
# Define the route for the landing page
@app.route('/landing')
def landing():
return render_template('landing.html')
# Route for home page
@app.route('/')
def home():
if 'user_id' not in session:
return redirect(url_for('landing'))
user_id = session['user_id']
user = User.query.get(user_id)
if user is None:
return redirect(url_for('login'))
expenses = user.expenses
total_expense = sum(expense.amount for expense in expenses)
category_totals = {}
for expense in expenses:
category = expense.category
amount = expense.amount
category_totals[category] = category_totals.get(category, 0) + amount
# Generate chart data
pie_chart_data = generate_pie_chart(category_totals)
bar_chart_data = generate_bar_chart(category_totals)
return render_template('index.html', expenses=expenses, total_expense=total_expense, category_totals=category_totals,
pie_chart_data=pie_chart_data, bar_chart_data=bar_chart_data)
# Function to generate pie chart
def generate_pie_chart(category_totals):
labels = list(category_totals.keys())
values = list(category_totals.values())
plt.figure(figsize=(10, 8))
plt.pie(values, labels=labels, autopct='%1.1f%%', startangle=140)
plt.axis('equal') # Equal aspect ratio ensures that pie is drawn as a circle
plt.title('Expense Distribution by Category')
# Convert the plot to a base64 encoded string
buffer = io.BytesIO()
plt.savefig(buffer, format='png')
buffer.seek(0)
chart_data = base64.b64encode(buffer.getvalue()).decode()
plt.close()
return chart_data
# Function to generate bar chart
def generate_bar_chart(category_totals):
labels = list(category_totals.keys())
values = list(category_totals.values())
plt.figure(figsize=(10, 8))
plt.bar(labels, values, color='skyblue')
plt.xlabel('Category')
plt.ylabel('Total Amount')
plt.title('Total Expense Amount by Category')
# Convert the plot to a base64 encoded string
buffer = io.BytesIO()
plt.savefig(buffer, format='png')
buffer.seek(0)
chart_data = base64.b64encode(buffer.getvalue()).decode()
plt.close()
return chart_data
# Route to handle adding new expenses
@app.route('/add_expense', methods=['POST'])
def add_expense():
if 'user_id' not in session:
return redirect(url_for('login'))
user_id = session['user_id']
category = request.form.get('category')
custom_category = request.form.get('custom_category')
# If category is not selected, use custom category if provided, otherwise set it to 'Other'
if not category:
category = custom_category.strip() if custom_category else 'Other'
amount = float(request.form['amount'])
new_expense = Expense(user_id=user_id, category=category, amount=amount)
db.session.add(new_expense)
db.session.commit()
return redirect(url_for('home'))
# Route to handle user logout
@app.route('/logout', methods=['POST'])
def logout():
# Perform logout operations (e.g., clearing session data)
session.clear() # Assuming you are using Flask session
# Redirect the user to the login page
return redirect(url_for('login'))
# Run the Flask application if this script is executed directly
if __name__ == '__main__':
app.run(debug=True)