forms.py

from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, SubmitField, BooleanField, FileField
from wtforms.validators import DataRequired, Length, Email, EqualTo, ValidationError
from models import User
from flask_wtf.file import FileAllowed

class RegistrationForm(FlaskForm):
    username = StringField('Username', validators=[DataRequired(), Length(2, 20)])
    email = StringField('Email', validators=[DataRequired(), Email()])
    password = PasswordField('Password', validators=[DataRequired()])
    confirm_password = PasswordField('Confirm Password', validators=[DataRequired(), EqualTo('password')])
    submit = SubmitField('Sign Up')

    # Additional validation to check if username or email already exists
    def validate_username(self, username):
        user = User.query.filter_by(username=username.data).first()
        if user:
            raise ValidationError('Username already taken. Please choose another.')

    def validate_email(self, email):
        user = User.query.filter_by(email=email.data).first()
        if user:
            raise ValidationError('Email already registered. Please choose another.')

class LoginForm(FlaskForm):
    email = StringField('Email', validators=[DataRequired(), Email()])
    password = PasswordField('Password', validators=[DataRequired()])
    remember = BooleanField('Remember Me')
    submit = SubmitField('Login')

class SubmissionForm(FlaskForm):
    data_file = FileField('Upload Prediction', validators=[DataRequired(), FileAllowed(['txt', 'csv', 'tsv', 'gz'], 'Text files only!')])
    submit = SubmitField('Submit')