import os
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager
from dotenv import load_dotenv

# Initialize core Flask extensions
db = SQLAlchemy()
login_manager = LoginManager()


def create_app():
    # Load environment variables
    load_dotenv()

    app = Flask(__name__)
    app.config["SECRET_KEY"] = os.getenv("FLASK_SECRET_KEY", "dev-secret")
    app.config["SQLALCHEMY_DATABASE_URI"] = os.getenv("DATABASE_URL")
    app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False

    # ✅ Tell Flask it's running under /signcodescout
    if os.getenv("SCRIPT_NAME", "/").startswith("/signcodescout"):
        app.config["APPLICATION_ROOT"] = "/signcodescout"
        app.config["PREFERRED_URL_SCHEME"] = "https"

    # Initialize extensions
    db.init_app(app)
    login_manager.init_app(app)
    login_manager.login_view = "auth.login"

    # Register blueprints
    from .auth import auth_bp
    from .lookups import lookups_bp
    from .billing import billing_bp

    app.register_blueprint(auth_bp)
    app.register_blueprint(lookups_bp)
    app.register_blueprint(billing_bp)

    # Define the main route
    @app.route("/")
    def index():
        from flask_login import current_user
        from flask import render_template, redirect, url_for
        if not current_user.is_authenticated:
            return redirect(url_for("auth.login"))
        return render_template("index.html")

    return app