from flask import Flask
from app.extensions import db, migrate, login_manager, mail
from config import config
import os

def create_app(config_name=None):
    app = Flask(__name__)
    
    config_name = config_name or os.environ.get('FLASK_CONFIG') or 'default'
    app.config.from_object(config[config_name])
    
    # Initialize extensions
    db.init_app(app)
    migrate.init_app(app, db)
    login_manager.init_app(app)
    mail.init_app(app)
    
    # Configure login manager
    login_manager.login_view = 'auth.login'
    login_manager.login_message = 'Please log in to access this page.'
    login_manager.login_message_category = 'info'
    
    @login_manager.user_loader
    def load_user(user_id):
        from app.models import User
        return User.query.get(int(user_id))
    
    # Import models
    from app.models import User, Post, PostImage, GPXFile, Comment, Like
    
    # Register blueprints
    from app.routes.main import main
    app.register_blueprint(main)
    
    from app.routes.auth import auth
    app.register_blueprint(auth, url_prefix='/auth')
    
    from app.routes.community import community
    app.register_blueprint(community, url_prefix='/community')
    
    # Create upload directories
    upload_dir = os.path.join(app.instance_path, 'uploads')
    os.makedirs(upload_dir, exist_ok=True)
    os.makedirs(os.path.join(upload_dir, 'images'), exist_ok=True)
    os.makedirs(os.path.join(upload_dir, 'gpx'), exist_ok=True)
    
    return app