"""Flask app factory."""
from flask import Flask
from . import config, db, forwarder
from .routes import landmarks, gnss, status, frames


def create_app():
    """Create and configure the Flask app."""
    app = Flask(__name__)
    
    # Load config and init DB
    config.load()
    db.init()
    
    # Register blueprints
    app.register_blueprint(landmarks.bp)
    app.register_blueprint(gnss.bp)
    app.register_blueprint(status.bp)
    app.register_blueprint(frames.bp)
    
    # Start background forwarder thread
    forwarder.start_retry_thread()
    
    return app