from flask import Flask
from app.config import Config, SYDNEY_TZ
from app.db import init_db, close_db


def create_app():
    app = Flask(__name__)
    app.config.from_object(Config)

    # Database lifecycle
    init_db(app)
    app.teardown_appcontext(close_db)

    # Jinja2 filter: convert UTC to Sydney time
    @app.template_filter('sydney')
    def sydney_time_filter(dt, fmt='%d %b %Y, %H:%M'):
        from datetime import timezone
        if dt is None:
            return ''
        if dt.tzinfo is None:
            dt = dt.replace(tzinfo=timezone.utc)
        return dt.astimezone(SYDNEY_TZ).strftime(fmt)

    # Make milestone labels available to all templates
    from app.utils import MILESTONE_LABELS
    app.jinja_env.globals['MILESTONE_LABELS'] = MILESTONE_LABELS

    # Register blueprints
    from app.routes.auth import bp as auth_bp
    from app.routes.dashboard import bp as dashboard_bp
    from app.routes.checkin import bp as checkin_bp
    from app.routes.profile import bp as profile_bp
    from app.routes.leaderboard import bp as leaderboard_bp
    from app.routes.api import bp as api_bp

    app.register_blueprint(auth_bp)
    app.register_blueprint(dashboard_bp)
    app.register_blueprint(checkin_bp)
    app.register_blueprint(profile_bp)
    app.register_blueprint(leaderboard_bp)
    app.register_blueprint(api_bp)

    return app