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

# Import model classes (stored on init_db_models function)
User = init_db_models.User

auth_bp = Blueprint('auth', __name__)


@auth_bp.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 not user or not user.check_password(password):
            flash('Invalid username or password.')
            return redirect(url_for('auth.login'))

        login_user(user)
        return redirect(url_for('main.index'))

    return render_template('login.html')


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


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

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

        user = User(username=username)
        user.set_password(password)
        db.session.add(user)
        db.session.commit()

        flash('Registered successfully. Please log in.')
        return redirect(url_for('auth.login'))

    return render_template('register.html')