from flask import Blueprint, render_template, redirect, url_for, flash, request
from flask_login import login_user, logout_user, login_required, current_user
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField, SubmitField
from wtforms.validators import DataRequired, Length
from app.models.user import User
from app.extensions import db
from datetime import datetime

auth_bp = Blueprint('auth', __name__, url_prefix='/auth')


class LoginForm(FlaskForm):
    username = StringField('Username', validators=[DataRequired(), Length(1, 64)])
    password = PasswordField('Password', validators=[DataRequired()])
    remember_me = BooleanField('Remember me')
    submit = SubmitField('Sign In')


@auth_bp.route('/login', methods=['GET', 'POST'])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('dashboard.index'))

    form = LoginForm()
    if form.validate_on_submit():
        user = User.query.filter_by(username=form.username.data.strip()).first()
        if user and user.check_password(form.password.data):
            login_user(user, remember=form.remember_me.data)
            user.last_login = datetime.utcnow()
            db.session.commit()
            next_page = request.args.get('next')
            return redirect(next_page or url_for('dashboard.index'))
        flash('Invalid username or password.', 'danger')

    return render_template('auth/login.html', form=form)


@auth_bp.route('/logout')
@login_required
def logout():
    logout_user()
    flash('You have been logged out.', 'info')
    return redirect(url_for('auth.login'))