from django import forms
from .models import Person
from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth.models import User

class UploadImage(forms.ModelForm):
  class Meta:
    model = Person
    fields = ['image']

 
class SignUpForm(UserCreationForm):
  class Meta:
    model = User
    fields = ('first_name', 'last_name', 'email', 'username', 'password1', 'password2', )

# Form to filter parents and partners by birth date
class PersonAdminForm(forms.ModelForm):
  class Meta:
    model = Person
    fields = '__all__'
    widgets = {
      'parent': forms.Select(attrs={'class': 'select2'}),
      'partners': forms.SelectMultiple(attrs={'class': 'select2'}),
    }

  def __init__(self, *args, **kwargs):
    super(PersonAdminForm, self).__init__(*args, **kwargs)
    if self.instance and self.instance.pk:
      print(self.instance.birth_date)
      # Parents that were born before the person and didn't die before the person or don't have any information
      if self.instance.birth_date:
        possible_parents = Person.objects.filter(birth_date__lt=self.instance.birth_date, death_date__gt=self.instance.birth_date) | \
                           Person.objects.filter(birth_date__lt=self.instance.birth_date, death_date__isnull=True, group=self.instance.group) | \
                           Person.objects.filter(birth_date__isnull=True, death_date__gt=self.instance.birth_date, group=self.instance.group) | \
                           Person.objects.filter(birth_date__isnull=True, death_date__isnull=True, group=self.instance.group)
      else:
        possible_parents = Person.objects.filter(group=self.instance.group)

      # return all persons if none were found
      if len(possible_parents) == 0:
        possible_parents = Person.objects.all()
      
      # add the current parent to the list of possible parents
      if self.instance.parent:
        possible_parents = possible_parents | Person.objects.filter(pk=self.instance.parent.pk)

      self.fields['parent'].queryset = possible_parents

      # Partners that were born before the person and didn't die before the person or don't have any information
      if self.instance.death_date and self.instance.birth_date:
        possible_partners = Person.objects.filter(birth_date__lt=self.instance.death_date, death_date__gt=self.instance.birth_date) | \
                            Person.objects.filter(birth_date__lt=self.instance.death_date, death_date__isnull=True, group=self.instance.group) | \
                            Person.objects.filter(birth_date__isnull=True, death_date__gt=self.instance.birth_date, group=self.instance.group) | \
                            Person.objects.filter(birth_date__isnull=True, death_date__isnull=True, group=self.instance.group)
      elif self.instance.birth_date:
        possible_partners = Person.objects.filter(death_date__gt=self.instance.birth_date, group=self.instance.group) | \
                            Person.objects.filter(death_date__isnull=True, group=self.instance.group)
      elif self.instance.death_date:
        possible_partners = Person.objects.filter(birth_date__lt=self.instance.death_date, group=self.instance.group) | \
                            Person.objects.filter(birth_date__isnull=True, group=self.instance.group)
      else:
        possible_partners = Person.objects.filter(group=self.instance.group)

      # return all persons if none were found
      if len(possible_partners) == 0:
        possible_partners = Person.objects.all()

      # add the current partners to the list of possible partners
      if self.instance.partners:
        possible_partners = possible_partners | Person.objects.filter(pk__in=self.instance.partners.all())

      self.fields['partners'].queryset = possible_partners