from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField, SubmitField, \
    TextAreaField
from wtforms.validators import ValidationError, DataRequired, Email, EqualTo, \
    Length
import sqlalchemy as sa
from app import db
from app.models import User


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 = db.session.scalar(sa.select(User).where(
            User.username == username.data))
        if user is not None:
            raise ValidationError('Please use a different username.')

    def validate_email(self, email):
        user = db.session.scalar(sa.select(User).where(
            User.email == email.data))
        if user is not None:
            raise ValidationError('Please use a different email address.')


class EditProfileForm(FlaskForm):
    username = StringField('Username', validators=[DataRequired()])
    about_me = TextAreaField('About me', validators=[Length(min=0, max=140)])
    submit = SubmitField('Submit')

    def __init__(self, original_username, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.original_username = original_username

    def validate_username(self, username):
        if username.data != self.original_username:
            user = db.session.scalar(sa.select(User).where(
                User.username == username.data))
            if user is not None:
                raise ValidationError('Please use a different username.')