from django import forms
from django.utils.translation import ugettext_lazy as _
from django.core.exceptions import ValidationError

from kaehmy.models import PresetRole, CustomRole, Application, Comment
from webapp.models import BaseRole

class CheckboxSelectMultiple(forms.widgets.CheckboxSelectMultiple):
    option_template_name = 'checkbox_option.html'

    def create_option(self, name, value, label, selected, index, subindex=None, attrs=None):
        dic = super(CheckboxSelectMultiple, self).create_option(name, value, label, selected, index, subindex, attrs)
        description = PresetRole.objects.get(id=value).description
        dic['description'] = description
        return dic

    def __init__(self, *args, **kwargs):
        super(CheckboxSelectMultiple, self).__init__(*args, **kwargs)


class ApplicationForm(forms.ModelForm):
    """Class representing Kaehmy form."""

    class Meta:
        """Meta for class Application."""

        model = Application
        fields = ['name', 'email', 'phone_number', 'year',
                  'preset_roles', 'custom_roles', 'custom_role_name',
                  'custom_role_is_board', 'text']

    def __init__(self, *args, **kwargs):
        super(ApplicationForm, self).__init__(*args, **kwargs)

        self.fields["email"].label = _('Email (not public)')
        self.fields["phone_number"].label = _('Phone number (not public)')

        custom_roles_exist = CustomRole.objects.all().exists()
        self.fields["custom_roles"].widget = forms.widgets.CheckboxSelectMultiple() if custom_roles_exist else forms.HiddenInput()
        self.fields["custom_roles"].help_text = ""
        self.fields["custom_roles"].label = _('Custom roles')
        self.fields["custom_roles"].queryset = CustomRole.objects.all()

        for cat_id, category in BaseRole.CATEGORIES:
            key = 'preset_roles_{}'.format(cat_id)
            qset = PresetRole.objects.filter(category=cat_id).order_by('category', '-is_board')
            self.fields[key] = forms.ModelMultipleChoiceField(qset)
            self.fields[key].widget = CheckboxSelectMultiple(attrs={
                'title': _('Preset roles'),
                'name': 'preset_roles',
            })
            self.fields[key].help_text = ""
            self.fields[key].queryset = qset
            self.fields[key].label = _(category)
            self.fields[key].required = False

    def clean(self):
        cleaned_data = super(ApplicationForm, self).clean()
        for key in cleaned_data.keys():
            if 'preset_roles_' in key:
                cleaned_data['preset_roles'] = cleaned_data['preset_roles'] | cleaned_data[key]

        return cleaned_data

    def clean_phone_number(self):
        """Clean phone number field."""
        number = self.cleaned_data.get('phone_number')
        if number.isdigit():
            return number
        else:
            raise ValidationError(_('Invalid phone number'))

    def clean_custom_role_name(self):
        """Check that no other custom role with same name exists."""
        custom_name = self.cleaned_data.get('custom_role_name')
        if not CustomRole.objects.filter(name=custom_name).exists():
            return custom_name
        else:
            raise ValidationError(_('Custom role with the same name already exists.'))

    def non_role_fields(self):
        return [self.fields[k] for k in self.fields.keys() if k not in ["preset_roles", "custom_roles"]]


class CommentForm(forms.ModelForm):

    class Meta:
        model = Comment
        fields = ['name', 'email', 'message', 'parent']