from flask_wtf import FlaskForm, RecaptchaField
from wtforms import StringField, PasswordField, SubmitField, HiddenField, BooleanField
from wtforms.validators import ValidationError, DataRequired, Email, EqualTo, Length
from flask_babel import _, lazy_gettext as _l
from app.models import User, Community
from sqlalchemy import func


class LoginForm(FlaskForm):
    user_name = StringField(_l('User name'), validators=[DataRequired()], render_kw={'autofocus': True, 'autocomplete': 'username'})
    password = PasswordField(_l('Password'), validators=[DataRequired()])
    low_bandwidth_mode = BooleanField(_l('Low bandwidth mode'))
    submit = SubmitField(_l('Log In'))


class RegistrationForm(FlaskForm):
    user_name = StringField(_l('User name'), validators=[DataRequired()], render_kw={'autofocus': True, 'autocomplete': 'username'})
    email = HiddenField(_l('Email'))
    real_email = StringField(_l('Email'), validators=[DataRequired(), Email(), Length(min=5, max=255)], render_kw={'autocomplete': 'email'})
    password = PasswordField(_l('Password'), validators=[DataRequired(), Length(min=8, max=50)], render_kw={'autocomplete': 'new-password'})
    password2 = PasswordField(
        _l('Repeat password'), validators=[DataRequired(),
                                           EqualTo('password')])
    question = StringField(_l('Why would you like to join this site?'), validators=[DataRequired(), Length(min=1, max=512)])
    recaptcha = RecaptchaField()

    submit = SubmitField(_l('Register'))

    def validate_real_email(self, email):
        user = User.query.filter(func.lower(User.email) == func.lower(email.data.strip())).first()
        if user is not None:
            raise ValidationError(_l('An account with this email address already exists.'))

    def validate_user_name(self, user_name):
        user_name.data = user_name.data.strip()
        if ' ' in user_name.data:
            raise ValidationError(_l('User names cannot contain spaces.'))
        if '@' in user_name.data:
            raise ValidationError(_l('User names cannot contain @.'))
        user = User.query.filter(func.lower(User.user_name) == func.lower(user_name.data.strip())).filter_by(ap_id=None).first()
        if user is not None:
            if user.deleted:
                raise ValidationError(_l('This username was used in the past and cannot be reused.'))
            else:
                raise ValidationError(_l('An account with this user name already exists.'))
        community = Community.query.filter(func.lower(Community.name) == func.lower(user_name.data.strip())).first()
        if community is not None:
            raise ValidationError(_l('A community with this name exists so it cannot be used for a user.'))
        
    def validate_password(self, password):
        if not password.data:
            return
        password.data = password.data.strip()
        if password.data == 'password' or password.data == '12345678' or password.data == '1234567890':
            raise ValidationError(_l('This password is too common.'))

        first_char = password.data[0]    # the first character in the string

        all_the_same = True
        # Compare all characters to the first character
        for char in password.data:
            if char != first_char:
                all_the_same = False
        if all_the_same:
            raise ValidationError(_l('This password is not secure.'))

        if password.data == 'password' or password.data == '12345678' or password.data == '1234567890':
            raise ValidationError(_l('This password is too common.'))


class ResetPasswordRequestForm(FlaskForm):
    email = StringField(_l('Email'), validators=[DataRequired(), Email()], render_kw={'autofocus': True})
    submit = SubmitField(_l('Request password reset'))


class ResetPasswordForm(FlaskForm):
    password = PasswordField(_l('Password'), validators=[DataRequired()], render_kw={'autofocus': True})
    password2 = PasswordField(
        _l('Repeat password'), validators=[DataRequired(),
                                           EqualTo('password')])
    submit = SubmitField(_l('Set password'))