from flask import Blueprint, request, render_template, redirect, url_for, flash
from flask_login import login_user, logout_user, login_required
from .models import User, db
from passlib.hash import argon2

auth = Blueprint('auth', __name__)


@auth.route('/register', methods=['GET', 'POST'])
def register():
    if request.method == 'POST':
        username = request.form.get('username')
        password = request.form.get('password')

        # Check if username already exists
        existing_user = User.query.filter_by(username=username).first()
        if existing_user:
            flash('Username already exists.')
            return redirect(url_for('auth.register'))

        # Create new user with hashed password
        new_user = User(username=username)
        new_user.set_password(password)
        db.session.add(new_user)
        db.session.commit()

        flash('Registration successful.')
        return redirect(url_for('auth.login'))

    return render_template('register.html')


@auth.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        username = request.form.get('username')
        password = request.form.get('password')

        user = User.query.filter_by(username=username).first()
        if user and user.check_password(password):
            login_user(user)
            return redirect(url_for('main.index'))

        flash('Invalid username or password.')

    return render_template('login.html')


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