app.py

import os
import logging
from flask import Flask, request, session
from flask_sqlalchemy import SQLAlchemy
from flask_babel import Babel, get_locale
from sqlalchemy.orm import DeclarativeBase
from werkzeug.middleware.proxy_fix import ProxyFix

# Set up logging
logging.basicConfig(level=logging.DEBUG)

class Base(DeclarativeBase):
    pass

db = SQLAlchemy(model_class=Base)

# Create the app
app = Flask(__name__)
app.secret_key = os.environ.get("SESSION_SECRET", "dev-secret-key-change-in-production")
app.wsgi_app = ProxyFix(app.wsgi_app, x_proto=1, x_host=1)

# Configure the database
database_url = os.environ.get("DATABASE_URL", "sqlite:///app.db")
app.config["SQLALCHEMY_DATABASE_URI"] = database_url
app.config["SQLALCHEMY_ENGINE_OPTIONS"] = {
    "pool_recycle": 300,
    "pool_pre_ping": True,
}

# Configure Babel for internationalization
app.config['LANGUAGES'] = {
    'en': 'English',
    'bn': 'বাংলা'
}
app.config['BABEL_DEFAULT_LOCALE'] = 'en'
app.config['BABEL_DEFAULT_TIMEZONE'] = 'UTC'

# Initialize extensions
db.init_app(app)
babel = Babel(app)

def get_locale():
    # Check if language is set in session
    if 'language' in session:
        return session['language']
    
    # Check Accept-Language header
    return request.accept_languages.best_match(app.config['LANGUAGES'].keys()) or 'en'

babel.init_app(app, locale_selector=get_locale)

# Make get_locale available in templates
@app.context_processor
def inject_get_locale():
    return dict(get_locale=get_locale)

with app.app_context():
    # Import models and routes
    import models
    import routes
    
    # Create all tables
    db.create_all()