from django.contrib import admin
from django import forms

from .models import Equipment, EquipmentDefault, EquipmentRevision, EquipmentCategory, EquipmentLost, EquipmentAttributeValue, EquipmentAttribute
from .fields import IdField, IdWidget

from shared.admin import admin_site


class IdForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        if 'min_value' in kwargs:
            kwargs.pop('min_value')
        if 'num_choices' in kwargs:
            num_choices = kwargs.pop('num_choices')
        super(IdForm, self).__init__(*args, **kwargs)

        for field in self.instance._meta.fields:
            if isinstance(field, IdField):
                if num_choices is None:
                    choices = []
                else:
                    choices = [(k, str(k)) for k in range(1, num_choices+1)]
                self.fields[field.name].choices = choices
                self.fields[field.name].widget = IdWidget(choices=self.fields[field.name].choices)


class IdFormset(forms.models.BaseInlineFormSet):
    def get_form_kwargs(self, index):
        kwargs = super().get_form_kwargs(index)
        if self.instance:
            kwargs["num_choices"] = self.instance.stock
        return kwargs


class EquipmentRevisionExtraInline(admin.TabularInline):
    model = EquipmentRevision
    extra = 0
    form = IdForm
    formset = IdFormset
    classes = ['collapse']


class EquipmentDefaultExtraInline(admin.TabularInline):
    model = EquipmentDefault
    extra = 0
    form = IdForm
    formset = IdFormset
    classes = ['collapse']


class EquipmentLostExtraInline(admin.TabularInline):
    model = EquipmentLost
    extra = 0
    form = IdForm
    formset = IdFormset
    classes = ['collapse']


class EquipmentAttributeValueInline(admin.TabularInline):
    model = EquipmentAttributeValue
    extra = 0


class CategoryAdmin(admin.ModelAdmin):
    list_display = ['name', 'parent']
    ordering = ['name', 'parent']


class EquipmentAttributeAdmin(admin.ModelAdmin):
    list_display = ['name']
    ordering = ['name']


class EquipmentAdmin(admin.ModelAdmin):
    readonly_fields = ['added_at', 'modified_at']
    list_display = ['name', 'stock', 'owner', 'category', 'modified_at']
    ordering = ['name', 'owner', 'category']
    inlines = [EquipmentAttributeValueInline,
               EquipmentDefaultExtraInline,
               EquipmentLostExtraInline,
               EquipmentRevisionExtraInline]


admin_site.register(Equipment, EquipmentAdmin)
admin_site.register(EquipmentCategory, CategoryAdmin)
admin_site.register(EquipmentAttribute, EquipmentAttributeAdmin)
admin.site.register(Equipment, EquipmentAdmin)