import os

import yaml
from flask import Flask

from tofu_api.api import TofuApiBlueprint
from tofu_api.config import DefaultConfig


def create_app() -> Flask:
    """
    App factory, returns a Flask app object.
    """
    # Set instance path to the project root directory
    project_root_dir = os.path.abspath('.')

    # Create and configure the app
    app = Flask(
        'tofu_api',
        instance_path=project_root_dir,
        instance_relative_config=True,
    )
    app.config.from_object(DefaultConfig)

    # Load app configuration from YAML file
    app.config.from_file(os.getenv('FLASK_CONFIG_FILE', default='config.yml'), load=yaml.safe_load)

    # Register blueprints
    app.register_blueprint(TofuApiBlueprint())

    # Return WSGI app
    return app