from flask import render_template, redirect, url_for, flash, request
from flask_login import login_user, logout_user, login_required, current_user
from urllib.parse import urlparse
from app import db
from app.models import User
from app.routes import auth_bp
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField, SubmitField
from wtforms.validators import DataRequired, Length, EqualTo, ValidationError

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

# Registration form
class RegistrationForm(FlaskForm):
    username = StringField('Username', validators=[DataRequired(), Length(min=3, max=64)])
    password = PasswordField('Password', validators=[DataRequired(), Length(min=8)])
    password2 = PasswordField('Confirm 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.')

@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).first()
        
        if user is None or not user.check_password(form.password.data):
            flash('Invalid username or password', 'error')
            return redirect(url_for('auth.login'))
        
        login_user(user, remember=form.remember_me.data)
        
        next_page = request.args.get('next')
        if not next_page or urlparse(next_page).netloc != '':
            next_page = url_for('dashboard.index')
            
        return redirect(next_page)
    
    return render_template('auth/login.html', title='Sign In', 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'))

@auth_bp.route('/register', methods=['GET', 'POST'])
def register():
    if current_user.is_authenticated:
        return redirect(url_for('dashboard.index'))
    
    form = RegistrationForm()
    if form.validate_on_submit():
        user = User(username=form.username.data)
        user.set_password(form.password.data)
        db.session.add(user)
        db.session.commit()
        flash('Registration successful! You can now log in.', 'success')
        return redirect(url_for('auth.login'))
    
    return render_template('auth/register.html', title='Register', form=form)

@auth_bp.route('/profile')
@login_required
def profile():
    return render_template('auth/profile.html', title='User Profile')