from django import forms
from django.utils.encoding import force_text

from django_select2.forms import (
    HeavySelect2MultipleWidget, HeavySelect2Widget, ModelSelect2MultipleWidget,
    ModelSelect2TagWidget, ModelSelect2Widget, Select2MultipleWidget,
    Select2Widget
)
from tests.testapp import models
from tests.testapp.models import Album, City, Country


class TitleSearchFieldMixin:
    search_fields = [
        'title__icontains',
        'pk__startswith'
    ]


class TitleModelSelect2Widget(TitleSearchFieldMixin, ModelSelect2Widget):
    pass


class TitleModelSelect2MultipleWidget(TitleSearchFieldMixin, ModelSelect2MultipleWidget):
    pass


class GenreSelect2TagWidget(TitleSearchFieldMixin, ModelSelect2TagWidget):
    model = models.Genre

    def create_value(self, value):
        self.get_queryset().create(title=value)


class ArtistCustomTitleWidget(ModelSelect2Widget):
    model = models.Artist
    search_fields = [
        'title__icontains'
    ]

    def label_from_instance(self, obj):
        return force_text(obj.title).upper()


class GenreCustomTitleWidget(ModelSelect2Widget):
    model = models.Genre
    search_fields = [
        'title__icontains'
    ]

    def label_from_instance(self, obj):
        return force_text(obj.title).upper()


class AlbumSelect2WidgetForm(forms.ModelForm):
    class Meta:
        model = models.Album
        fields = (
            'artist',
            'primary_genre',
        )
        widgets = {
            'artist': Select2Widget,
            'primary_genre': Select2Widget,

        }


class AlbumSelect2MultipleWidgetForm(forms.ModelForm):
    class Meta:
        model = models.Album
        fields = (
            'genres',
            'featured_artists',
        )
        widgets = {
            'genres': Select2MultipleWidget,
            'featured_artists': Select2MultipleWidget,
        }


class AlbumModelSelect2WidgetForm(forms.ModelForm):
    class Meta:
        model = models.Album
        fields = (
            'artist',
            'primary_genre',
        )
        widgets = {
            'artist': ArtistCustomTitleWidget(),
            'primary_genre': GenreCustomTitleWidget(),
        }

    def __init__(self, *args, **kwargs):
        super(AlbumModelSelect2WidgetForm, self).__init__(*args, **kwargs)
        self.fields['primary_genre'].initial = 2


class AlbumModelSelect2MultipleWidgetRequiredForm(forms.ModelForm):
    class Meta:
        model = Album
        fields = (
            'genres',
            'featured_artists',
        )
        widgets = {
            'genres': TitleModelSelect2MultipleWidget,
            'featured_artists': TitleModelSelect2MultipleWidget,
        }


class ArtistModelSelect2MultipleWidgetForm(forms.Form):
    title = forms.CharField(max_length=50)
    genres = forms.ModelMultipleChoiceField(widget=ModelSelect2MultipleWidget(
        queryset=models.Genre.objects.all(),
        search_fields=['title__icontains'],
    ), queryset=models.Genre.objects.all(), required=True)

    featured_artists = forms.ModelMultipleChoiceField(widget=ModelSelect2MultipleWidget(
        queryset=models.Artist.objects.all(),
        search_fields=['title__icontains'],
    ), queryset=models.Artist.objects.all(), required=False)


NUMBER_CHOICES = [
    (1, 'One'),
    (2, 'Two'),
    (3, 'Three'),
    (4, 'Four'),
]


class Select2WidgetForm(forms.Form):
    number = forms.ChoiceField(widget=Select2Widget, choices=NUMBER_CHOICES, required=False)


class HeavySelect2WidgetForm(forms.Form):
    artist = forms.ChoiceField(
        widget=HeavySelect2Widget(data_view='heavy_data_1'),
        choices=NUMBER_CHOICES
    )
    primary_genre = forms.ChoiceField(
        widget=HeavySelect2Widget(data_view='heavy_data_2'),
        required=False,
        choices=NUMBER_CHOICES
    )


class HeavySelect2MultipleWidgetForm(forms.Form):
    title = forms.CharField(max_length=50)
    genres = forms.MultipleChoiceField(
        widget=HeavySelect2MultipleWidget(
            data_view='heavy_data_1',
            choices=NUMBER_CHOICES,
            attrs={'data-minimum-input-length': 0},
        ),
        choices=NUMBER_CHOICES
    )
    featured_artists = forms.MultipleChoiceField(
        widget=HeavySelect2MultipleWidget(
            data_view='heavy_data_2',
            choices=NUMBER_CHOICES,
            attrs={'data-minimum-input-length': 0},
        ),
        choices=NUMBER_CHOICES,
        required=False
    )

    def clean_title(self):
        if len(self.cleaned_data['title']) < 3:
            raise forms.ValidationError("Title must have more than 3 characters.")
        return self.cleaned_data["title"]


class ModelSelect2TagWidgetForm(forms.ModelForm):
    class Meta:
        model = Album
        fields = ['genres']
        widgets = {
            'genres': GenreSelect2TagWidget
        }


class AddressChainedSelect2WidgetForm(forms.Form):
    country = forms.ModelChoiceField(
        queryset=Country.objects.all(),
        label='Country',
        widget=ModelSelect2Widget(
            search_fields=['name__icontains'],
            max_results=500,
            dependent_fields={'city': 'cities'},
            attrs={'data-minimum-input-length': 0},
        )
    )

    city = forms.ModelChoiceField(
        queryset=City.objects.all(),
        label='City',
        widget=ModelSelect2Widget(
            search_fields=['name__icontains'],
            dependent_fields={'country': 'country'},
            max_results=500,
            attrs={'data-minimum-input-length': 0},
        )
    )


class GroupieForm(forms.ModelForm):
    class Meta:
        model = models.Groupie
        fields = '__all__'
        widgets = {
            'obsession': ArtistCustomTitleWidget
        }