import safe
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, IntegerField, SubmitField
from wtforms.fields.html5 import DateField
from wtforms.validators import DataRequired, Length, EqualTo, InputRequired, \
    ValidationError, NumberRange, Optional
from datetime import date

from db import get_registration_code, get_registered_user


def safe_password_validator(form: FlaskForm, field):
    strength = safe.check(field.data, level=safe.MEDIUM)
    if not strength.valid:
        raise ValidationError("Password is not secure enough: %s" % strength.message)


def registration_code_validator(form: FlaskForm, field):
    registration_code = get_registration_code(field.data)
    if registration_code is None:
        raise ValidationError("Registration code invalid!")
    if registration_code.is_expired():
        raise ValidationError("Registration code expired!")
    if not registration_code.has_available_uses():
        raise ValidationError("Registration code out of uses!")


def username_availability_validator(form: FlaskForm, field):
    registered_user = get_registered_user(field.data)
    if registered_user is not None:
        raise ValidationError("Username already registered!")


def registration_code_expiration_date_validator(form: FlaskForm, field):
    if field.data <= date.today():
        raise ValidationError("Expiration Date must be in the future!")


class RegistrationForm(FlaskForm):
    username = StringField(
        'Username',
        validators=[
            DataRequired(),
            Length(min=3, max=30),
            username_availability_validator
        ])
    password = PasswordField(
        'Password',
        validators=[
            InputRequired(),
            EqualTo('confirm', message='Passwords must match'),
            safe_password_validator
        ])
    confirm = PasswordField('Repeat Password')
    registration_code = StringField(
        'Registration Code', validators=[DataRequired(), registration_code_validator])


class LoginForm(FlaskForm):
    username = StringField('Username', validators=[DataRequired()])
    token = PasswordField('Token', validators=[DataRequired()])


class RegistrationCodeForm(FlaskForm):
    expiration_time = DateField('Expiration Time',
                                format='%Y-%m-%d',
                                validators=[Optional(), registration_code_expiration_date_validator])
    max_usages = IntegerField('Max Usages', validators=[NumberRange(min=1)])


class ExpireRegistrationCodeForm(FlaskForm):
    registration_code = StringField('Registration Code')
    expire = SubmitField(label='Expire')
    delete = SubmitField(label='Delete')