from flask import Blueprint, render_template, request, redirect, url_for, flash
from flask_login import login_user, logout_user, login_required, current_user
from app.models import User
from app import db

auth_bp = Blueprint('auth', __name__)

@auth_bp.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        
        user = User.query.filter_by(username=username).first()
        
        if user and user.check_password(password):
            login_user(user)
            next_page = request.args.get('next')
            return redirect(next_page) if next_page else redirect(url_for('main.dashboard'))
        else:
            flash('Ungültiger Benutzername oder Passwort')
    
    return render_template('auth/login.html')

@auth_bp.route('/register', methods=['GET', 'POST'])
def register():
    if request.method == 'POST':
        username = request.form['username']
        email = request.form['email']
        password = request.form['password']
        
        # Prüfe ob Benutzer bereits existiert
        if User.query.filter_by(username=username).first():
            flash('Benutzername bereits vergeben')
            return render_template('auth/register.html')
        
        if User.query.filter_by(email=email).first():
            flash('E-Mail bereits vergeben')
            return render_template('auth/register.html')
        
        # Erstelle neuen Benutzer
        user = User(username=username, email=email)
        user.set_password(password)
        db.session.add(user)
        db.session.commit()
        
        flash('Registrierung erfolgreich')
        return redirect(url_for('auth.login'))
    
    return render_template('auth/register.html')

@auth_bp.route('/logout')
@login_required
def logout():
    logout_user()
    return redirect(url_for('auth.login'))