#Project Example

# app/__init__.py
from flask import Flask
from .extensions import db, migrate, login_manager
from .auth import bp as auth_bp
from .main import bp as main_bp

def create_app(config_object=None):
    app = Flask(__name__, instance_relative_config=True)
    
    # Configuration
    app.config.from_mapping(
        SECRET_KEY="dev",
        SQLALCHEMY_DATABASE_URI="sqlite:///blog.db",
        SQLALCHEMY_TRACK_MODIFICATIONS=False,
    )
    
    if config_object:
        app.config.from_object(config_object)
    
    # Initialize extensions
    db.init_app(app)
    migrate.init_app(app, db)
    login_manager.init_app(app)
    login_manager.login_view = "auth.login"
    
    # Register blueprints
    app.register_blueprint(auth_bp, url_prefix="/auth")
    app.register_blueprint(main_bp)
    
    return app

# app/extensions.py
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from flask_login import LoginManager

db = SQLAlchemy()
migrate = Migrate()
login_manager = LoginManager()

# app/models.py
from flask_sqlalchemy import SQLAlchemy
from flask_login import UserMixin
from werkzeug.security import generate_password_hash, check_password_hash
from .extensions import db

class User(db.Model, UserMixin):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    password_hash = db.Column(db.String(255), nullable=False)
    posts = db.relationship('Post', backref='author', lazy=True)

    def set_password(self, password):
        self.password_hash = generate_password_hash(password)

    def check_password(self, password):
        return check_password_hash(self.password_hash, password)

class Post(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(200), nullable=False)
    content = db.Column(db.Text, nullable=False)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
    created_at = db.Column(db.DateTime, server_default=db.func.now())