import os
from flask import Flask, redirect, url_for, request, current_app
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager, current_user
from flask_migrate import Migrate
from sqlalchemy import text

# ✅ Docker-Pfade
UPLOAD_FOLDER = '/app/uploads'
RESULT_FOLDER = '/app/results'

db = SQLAlchemy()
login_manager = LoginManager()
migrate = Migrate()


def _run_migrations(app):
    """Fehlende DB-Spalten automatisch hinzufügen – übersteht jeden Neustart"""
    migrations = [
        ("job",  "result_filename_raw", "VARCHAR(150)"),
        ("job",  "scraper_job_id",      "VARCHAR(255)"),
        ("user", "is_admin",            "BOOLEAN DEFAULT 0"),
    ]
    with app.app_context():
        for table, column, col_type in migrations:
            try:
                db.session.execute(text(f"ALTER TABLE {table} ADD COLUMN {column} {col_type}"))
                db.session.commit()
                print(f"✅ Migration: {table}.{column} hinzugefügt")
            except Exception:
                db.session.rollback()


def create_app():
    app = Flask(__name__)

    # 🔑 Configs
    app.config['SECRET_KEY'] = '008e7369b075886d5f494c8813efdfb17155da6af12b3fe8ee'
    app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///users.db'
    app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
    app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
    app.config['RESULT_FOLDER'] = RESULT_FOLDER
    app.config['ALLOW_USER_SIGNUP'] = False

    # DB + Tools
    db.init_app(app)
    migrate.init_app(app, db)
    login_manager.init_app(app)
    login_manager.login_view = 'auth.login'

    # User Loader
    @login_manager.user_loader
    def load_user(user_id):
        from .models import User
        return User.query.get(int(user_id))

    # Protected Routes
    @app.before_request
    def require_login():
        allowed = ['auth.login', 'auth.signup', 'static']
        if (not current_user.is_authenticated and
            request.endpoint not in allowed and
            not request.path.startswith('/static')):
            return redirect(url_for('auth.login'))

    # Ordner
    os.makedirs(app.config['UPLOAD_FOLDER'], exist_ok=True)
    os.makedirs(app.config['RESULT_FOLDER'], exist_ok=True)

    # Routes
    from . import routes
    app.register_blueprint(routes.bp)

    # Index Redirect
    @app.route('/')
    def index():
        return redirect(url_for('auth.job_status'))

    # DB Tables + Auto-Migration
    with app.app_context():
        db.create_all()
        _run_migrations(app)

    return app

if __name__ == '__main__':
    app = create_app()
    app.run(host='0.0.0.0', port=5000, debug=False)