from flask import Flask, redirect, url_for
from app.config import Config
from app.services.db_service import db

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

    # Initialize extensions
    db.init_app(app)

    # Register blueprints
    register_blueprints(app)
    # Register error handlers
    register_error_handlers(app)

    # ROOT → LOGIN
    @app.route("/")
    def index():
        return redirect(url_for("auth.login"))

    return app


def register_blueprints(app):
    from app.routes.auth import auth_bp
    from app.routes.user import user_bp
    from app.routes.dashboard import dashboard_bp
    from app.routes.subcontractor_routes import subcontractor_bp
    from app.routes.file_import import file_import_bp
    from app.routes.file_report import file_report_bp
    from app.routes.generate_comparison_report import generate_report_bp
    from app.routes.file_format import file_format_bp 

    app.register_blueprint(auth_bp) 
    app.register_blueprint(user_bp)
    app.register_blueprint(dashboard_bp)
    app.register_blueprint(subcontractor_bp)
    app.register_blueprint(file_import_bp)
    app.register_blueprint(file_report_bp)
    app.register_blueprint(generate_report_bp)
    app.register_blueprint(file_format_bp )


def register_error_handlers(app):
    @app.errorhandler(404)
    def page_not_found(e):
        return "Page Not Found", 404

    @app.errorhandler(500)
    def internal_error(e):
        return "Internal Server Error", 500