from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, SubmitField, SelectField
from wtforms.validators import DataRequired, Email, Length, EqualTo, ValidationError
from app.models import User

class LoginForm(FlaskForm):
    email = StringField('Email', validators=[DataRequired(), Email()])
    password = PasswordField('Password', validators=[DataRequired()])
    submit = SubmitField('Sign In')

class RegistrationForm(FlaskForm):
    username = StringField('Username', validators=[DataRequired(), Length(min=2, max=20)])
    email = StringField('Email', validators=[DataRequired(), Email()])
    password = PasswordField('Password', validators=[DataRequired(), Length(min=6)])
    confirm_password = PasswordField('Confirm Password', 
                                   validators=[DataRequired(), EqualTo('password')])
    role = SelectField('Role', choices=[('student', 'Student'), ('teacher', 'Teacher')],
                      validators=[DataRequired()])
    submit = SubmitField('Register')

    def validate_email(self, email):
        user = User.get_by_email(email.data)
        if user:
            raise ValidationError('Email already registered. Please choose a different one.')