"""
Configuration management for StarPunk
Loads settings from environment variables and .env file
"""

import os
from pathlib import Path
from dotenv import load_dotenv


def load_config(app, config_override=None):
    """
    Load configuration into Flask app

    Args:
        app: Flask application instance
        config_override: Optional dict to override config values
    """
    # Load .env file
    load_dotenv()

    # Site configuration
    app.config['SITE_URL'] = os.getenv('SITE_URL', 'http://localhost:5000')
    app.config['SITE_NAME'] = os.getenv('SITE_NAME', 'StarPunk')
    app.config['SITE_AUTHOR'] = os.getenv('SITE_AUTHOR', 'Unknown')
    app.config['SITE_DESCRIPTION'] = os.getenv(
        'SITE_DESCRIPTION',
        'A minimal IndieWeb CMS'
    )

    # Authentication
    app.config['ADMIN_ME'] = os.getenv('ADMIN_ME')
    app.config['SESSION_SECRET'] = os.getenv('SESSION_SECRET')
    app.config['SESSION_LIFETIME'] = int(os.getenv('SESSION_LIFETIME', '30'))
    app.config['INDIELOGIN_URL'] = os.getenv(
        'INDIELOGIN_URL',
        'https://indielogin.com'
    )

    # Validate required configuration
    if not app.config['SESSION_SECRET']:
        raise ValueError(
            "SESSION_SECRET must be set in .env file. "
            "Generate with: python3 -c \"import secrets; print(secrets.token_hex(32))\""
        )

    # Flask secret key (uses SESSION_SECRET by default)
    app.config['SECRET_KEY'] = os.getenv(
        'FLASK_SECRET_KEY',
        app.config['SESSION_SECRET']
    )

    # Data paths
    app.config['DATA_PATH'] = Path(os.getenv('DATA_PATH', './data'))
    app.config['NOTES_PATH'] = Path(os.getenv('NOTES_PATH', './data/notes'))
    app.config['DATABASE_PATH'] = Path(
        os.getenv('DATABASE_PATH', './data/starpunk.db')
    )

    # Flask environment
    app.config['ENV'] = os.getenv('FLASK_ENV', 'development')
    app.config['DEBUG'] = os.getenv('FLASK_DEBUG', '1') == '1'

    # Logging
    app.config['LOG_LEVEL'] = os.getenv('LOG_LEVEL', 'INFO')

    # Apply overrides if provided
    if config_override:
        app.config.update(config_override)

    # Ensure data directories exist
    app.config['DATA_PATH'].mkdir(parents=True, exist_ok=True)
    app.config['NOTES_PATH'].mkdir(parents=True, exist_ok=True)