import functools

from flask import (
    Blueprint, flash, g, redirect, render_template, request, session, url_for
)
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField, \
    SubmitField
from wtforms.validators import ValidationError, DataRequired, \
    Email, EqualTo, Length, Regexp
from werkzeug.security import check_password_hash, generate_password_hash
import re

bp = Blueprint('reset', __name__, url_prefix='/reset')

class ResetPasswordForm(FlaskForm):
    # Minimal password length
    minlength = 9

    # Form
    username = StringField(label=('Login'), 
        validators=[DataRequired(), 
        Length(max=64)])
    currentpassword = PasswordField(label=('Current password'), 
        validators=[DataRequired()])
    newpassword = PasswordField(label=('New password'), 
        validators=[DataRequired(), 
        Length(min=minlength, message='Password should be at least %(min)d characters long'),
        Regexp("^(?=.*[a-z])", message="Password must have a lowercase character"),
        Regexp("^(?=.*[A-Z])", message="Password must have an uppercase character"),
        Regexp("^(?=.*\\d)", message="Password must contain a number"),
        #Regexp(
        #    "(?=.*[@$!%*#?&])", message="Password must contain a special character"
        #),],
        ],
        render_kw={"onkeyup": f"validate_form({minlength})"})
    confirm_password = PasswordField(
        label=('Confirm Password'), 
        validators=[DataRequired(message='* Required'),
        EqualTo('newpassword', message='Both password fields must be equal!')],
        render_kw={"onkeyup": f"validate_confirm({minlength})"})

    submit = SubmitField(label=('Change my password'), render_kw={"onclick": f"validate_form({minlength})"})

    # Validators
    def validate_username(self, username):
        excluded_chars = " *?!'^+%&/()=}][{$#;\\\""
        for char in self.username.data:
            if char in excluded_chars:
                raise ValidationError(
                    f"Character {char} is not allowed in a login.")

@bp.route('/', methods=('GET', 'POST'))
def reset():
    form = ResetPasswordForm()
    if form.validate_on_submit():
        return f'''<h1> Welcome {form.username.data} </h1>'''
    return render_template('reset.html', form=form)