# accounts.forms.py
from django import forms
from django.contrib.auth.forms import ReadOnlyPasswordHashField

from .models import User

# Import Python web3 script
from utils.web3_scripts import assign_address, assign_address_v3

# Form for signup view
class RegisterForm(forms.ModelForm):
    password = forms.CharField(widget=forms.PasswordInput)
    password2 = forms.CharField(label='Confirm password', widget=forms.PasswordInput)

    class Meta:
        model = User
        fields = ('email','first_name', 'last_name', 'institution')

    def clean_email(self):
        email = self.cleaned_data.get('email')
        qs = User.objects.filter(email=email)
        if qs.exists():
            raise forms.ValidationError("This email is already in use")
        return email

    def clean_password2(self):
        # Check that the two password entries match
        password1 = self.cleaned_data.get("password1")
        password2 = self.cleaned_data.get("password2")
        if password1 and password2 and password1 != password2:
            raise forms.ValidationError("Passwords don't match")
        return password2

    def save(self, commit=True):
        # Save the provided password in hashed format
        user = super(RegisterForm, self).save(commit=False)
        user.set_password(self.cleaned_data["password"])
        user.active = True 
        # Could also set this to false and wait for e.g. e-mail confirmation first

        # Assign ethereum address to user via web3 script
        # The script already saves the user object to the database
        current_user = assign_address_v3(user)
        if commit:
            user.save()
        return user

# Form for login view
class LoginForm(forms.Form):
    email = forms.EmailField(label="Email")
    password = forms.CharField(widget=forms.PasswordInput)


class UserAdminCreationForm(forms.ModelForm):
    """A form for creating new users. Includes all the required
    fields, plus a repeated password."""
    password1 = forms.CharField(label='Password', widget=forms.PasswordInput)
    password2 = forms.CharField(label='Password confirmation', widget=forms.PasswordInput)

    class Meta:
        model = User
        fields = ('email', 'first_name', 'last_name', 'institution')

    def clean_password2(self):
        # Check that the two password entries match
        password1 = self.cleaned_data.get("password1")
        password2 = self.cleaned_data.get("password2")
        if password1 and password2 and password1 != password2:
            raise forms.ValidationError("Passwords don't match")
        return password2

    def save(self, commit=True):
        # Save the provided password in hashed format
        user = super(UserAdminCreationForm, self).save(commit=False)
        user.set_password(self.cleaned_data["password1"])
        if commit:
            user.save()
        return user


class UserAdminChangeForm(forms.ModelForm):
    """A form for updating users. Includes all the fields on
    the user, but replaces the password field with admin's
    password hash display field.
    """
    password = ReadOnlyPasswordHashField()

    class Meta:
        model = User
        fields = ('email', 'first_name', 'last_name', 'institution', 'password', 'active', 'staff', 'admin')

    def clean_password(self):
        # Regardless of what the user provides, return the initial value.
        # This is done here, rather than on the field, because the
        # field does not have access to the initial value
        return self.initial["password"]