import string

from django import forms
from django.contrib.auth.models import User
from django.contrib.auth import authenticate

from workshop.reg.models import Profile

class LoginForm(forms.Form):
    """ a form to handle login.
    """

    email = forms.EmailField()
    password = forms.CharField(widget=forms.PasswordInput)

    def clean_email(self):
        """ see if a user exists for this email.
        """

        email = self.cleaned_data['email']
        password = self.data['password']
        try:
            username = User.objects.get(email__iexact=email).username
        except User.DoesNotExist:
            raise forms.ValidationError("Incorrect e-mail or password")

        user = authenticate(username=username, password=password)
        if not user:
            raise forms.ValidationError("Incorrect e-mail or password")
        return email

class RegisterForm(forms.ModelForm):
    """ add the fields email and password
    and then generate form using profile model.
    """

    email = forms.EmailField()
    password = forms.CharField(widget=forms.PasswordInput, help_text="Choose a good password which 8 to 30 chars long")
    confirm_password = forms.CharField(widget=forms.PasswordInput) 

    first_name = forms.CharField(required=True)
    last_name = forms.CharField()

    class Meta:
        model = Profile
        fields = ['email', 'password', 'confirm_password', 'first_name', 'last_name', 'gender', 'profession', 'affiliated_to', 'interests']

    def clean_email(self):
        """ check if a user exists with same email.
        """

        email = self.cleaned_data['email']
        try:
            User.objects.get(email__iexact=email)
            raise forms.ValidationError("An account already exists with this email.\
                                        Click on forgot password if you have forgotten your password")
        except User.DoesNotExist:
            return email

    def clean_password(self):
        """ check if the password contains only alphabets or digits or punctuation.
        then check if the size of the password is optimal.
        then check if both the given passwords match.
        """

        password = self.cleaned_data['password']

        if password.strip(string.ascii_letters+string.punctuation+string.digits):
            raise forms.ValidationError("Only alphabets, digits and punctuation symbols are allowed in password")

        if not 8 <= len(password) <= 30:
            raise forms.ValidationError("Password must be atleast 8 characters and at most 30 characters")

        if not password == self.data['confirm_password']:
            raise forms.ValidationError("Passwords do not match")