"""
Flask application factory for Podcastrr.
"""
import os
from flask import Flask
from flask_migrate import Migrate

def create_app(config=None):
    """
    Create and configure the Flask application.

    Args:
        config: Configuration object or path to configuration file.

    Returns:
        Flask application instance.
    """
    app = Flask(__name__,
                template_folder='templates',
                static_folder='static')

    # Load default configuration
    app.config.from_mapping(
        SECRET_KEY=os.environ.get('SECRET_KEY', 'dev'),
        SQLALCHEMY_DATABASE_URI=os.environ.get('DATABASE_URI', 'sqlite:///podcastrr.db'),
        SQLALCHEMY_TRACK_MODIFICATIONS=False,
        DOWNLOAD_PATH=os.environ.get('DOWNLOAD_PATH', os.path.join(os.getcwd(), 'downloads')),
    )

    # Load additional configuration if provided
    if config:
        app.config.from_mapping(config)

    # Import and initialize database
    from app.models.database import db
    db.init_app(app)
    Migrate(app, db)

    # Import and register blueprints
    from app.web.routes.main import main_bp
    from app.web.routes.podcasts import podcasts_bp
    from app.web.routes.settings import settings_bp
    from app.web.routes.api import api_bp
    from app.web.routes.tasks import tasks_bp

    app.register_blueprint(main_bp)
    app.register_blueprint(podcasts_bp, url_prefix='/podcasts')
    app.register_blueprint(settings_bp, url_prefix='/settings')
    app.register_blueprint(api_bp, url_prefix='/api')
    app.register_blueprint(tasks_bp)

    # Ensure the download directory exists
    os.makedirs(app.config['DOWNLOAD_PATH'], exist_ok=True)

    # Run database migrations
    with app.app_context():
        try:
            from migrations.add_season_explicit_naming_format import run_migration
            run_migration()

            # Run migration to add episode_ordering column
            from migrations.add_episode_ordering import run_migration as run_episode_ordering_migration
            run_episode_ordering_migration()
        except Exception as e:
            app.logger.error(f"Error running migration: {str(e)}")

    return app