from flask import Blueprint, render_template, redirect, url_for, flash
from flask_login import login_user, logout_user, current_user
from app import db
from app.models import User
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField, SubmitField
from wtforms.validators import DataRequired, Email, EqualTo, ValidationError

bp = Blueprint('auth', __name__)

# --- Forms ---
class LoginForm(FlaskForm):
    username = StringField('Username', validators=[DataRequired()])
    password = PasswordField('Password', validators=[DataRequired()])
    remember_me = BooleanField('Remember Me')
    submit = SubmitField('Sign In')

class RegistrationForm(FlaskForm):
    username = StringField('Username', validators=[DataRequired()])
    email = StringField('Email', validators=[DataRequired(), Email()])
    password = PasswordField('Password', validators=[DataRequired()])
    password2 = PasswordField(
        'Repeat Password', validators=[DataRequired(), EqualTo('password')])
    submit = SubmitField('Register')

    def validate_username(self, username):
        user = User.query.filter_by(username=username.data).first()
        if user is not None:
            raise ValidationError('Please use a different username.')

    def validate_email(self, email):
        user = User.query.filter_by(email=email.data).first()
        if user is not None:
            raise ValidationError('Please use a different email address.')


# --- Routes ---
@bp.route('/login', methods=['GET', 'POST'])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('main.dashboard'))
    form = LoginForm()
    if form.validate_on_submit():
        user = User.query.filter_by(username=form.username.data).first()
        if user is None or not user.check_password(form.password.data):
            flash('Invalid username or password')
            return redirect(url_for('auth.login'))
        login_user(user, remember=form.remember_me.data)
        if user.is_admin:
            return redirect(url_for('main.admin_dashboard'))
        return redirect(url_for('main.dashboard'))
    return render_template('auth/login.html', title='Sign In', form=form)

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

@bp.route('/register', methods=['GET', 'POST'])
def register():
    if current_user.is_authenticated:
        return redirect(url_for('main.dashboard'))
    form = RegistrationForm()
    if form.validate_on_submit():
        user = User(username=form.username.data, email=form.email.data)
        user.set_password(form.password.data)
        # Make the first registered user an admin
        if User.query.count() == 0:
            user.is_admin = True
            flash('Congratulations, you are now the admin!')
        db.session.add(user)
        db.session.commit()
        flash('Congratulations, you are now a registered user!')
        return redirect(url_for('auth.login'))
    return render_template('auth/register.html', title='Register', form=form)