import json

from django import forms
from django.contrib import admin
from django.contrib.admin import SimpleListFilter
from django.http import JsonResponse
from django.urls import path
from django.utils.html import format_html
from django.views.decorators.http import require_POST

from .models import Box, BoxType, Facet, Tag, Thing, ThingFile, ThingLink


class BoxFilter(SimpleListFilter):
    """Custom filter for boxes using pk to avoid spaces in aliases."""

    title = 'box'
    parameter_name = 'box__pk'

    def lookups(self, request, model_admin):
        boxes = Box.objects.select_related('box_type').order_by('sort_order')
        return [(box.pk, str(box)) for box in boxes]

    def queryset(self, request, queryset):
        if self.value():
            return queryset.filter(box__pk=self.value())
        return queryset


class TagsFilter(SimpleListFilter):
    """Custom filter for tags using pk to avoid spaces in aliases."""

    title = 'tags'
    parameter_name = 'tags__pk'

    def lookups(self, request, model_admin):
        tags = Tag.objects.select_related('facet').order_by('facet__name', 'name')
        return [(tag.pk, str(tag)) for tag in tags]

    def queryset(self, request, queryset):
        if self.value():
            return queryset.filter(tags__pk=self.value())
        return queryset


@admin.register(BoxType)
class BoxTypeAdmin(admin.ModelAdmin):
    """Admin configuration for BoxType model."""

    list_display = ('name', 'width', 'height', 'length')
    search_fields = ('name',)


@admin.register(Box)
class BoxAdmin(admin.ModelAdmin):
    """Admin configuration for Box model."""

    ordering = ['sort_order']
    list_display = ('id', 'box_type', 'sort_order')
    list_filter = ('box_type',)
    search_fields = ('id',)
    change_list_template = 'admin/boxes/box/change_list.html'

    def get_urls(self):
        urls = super().get_urls()
        custom_urls = [
            path('reorder/', self.admin_site.admin_view(self.reorder_view), name='boxes_box_reorder'),
        ]
        return custom_urls + urls

    def reorder_view(self, request):
        """Handle AJAX reorder requests."""
        if request.method != 'POST':
            return JsonResponse({'error': 'POST required'}, status=405)

        try:
            data = json.loads(request.body)
            order = data.get('order', [])

            for index, pk in enumerate(order):
                Box.objects.filter(pk=pk).update(sort_order=index)

            return JsonResponse({'status': 'ok'})
        except (json.JSONDecodeError, KeyError) as e:
            return JsonResponse({'error': str(e)}, status=400)


class ThingFileInline(admin.TabularInline):
    """Inline admin for Thing files."""

    model = ThingFile
    extra = 1
    fields = ('title', 'file')


class ThingLinkInline(admin.TabularInline):
    """Inline admin for Thing links."""

    model = ThingLink
    extra = 1
    fields = ('title', 'url')


class ThingAdmin(admin.ModelAdmin):
    """Admin configuration for Thing model."""

    list_display = ('name', 'box')
    list_filter = (BoxFilter, TagsFilter)
    search_fields = ('name', 'description')
    filter_horizontal = ('tags',)
    inlines = [ThingFileInline, ThingLinkInline]


admin.site.register(Thing, ThingAdmin)


@admin.register(ThingFile)
class ThingFileAdmin(admin.ModelAdmin):
    """Admin configuration for ThingFile model."""

    list_display = ('thing', 'title', 'uploaded_at')
    list_filter = ('thing',)
    search_fields = ('title',)


class ColorInput(forms.TextInput):
    """Color picker widget using HTML5 color input."""

    input_type = 'color'


class FacetAdminForm(forms.ModelForm):
    """Form for Facet model with color picker widget."""

    class Meta:
        model = Facet
        fields = '__all__'

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['color'].widget = ColorInput(attrs={'type': 'color', 'style': 'height: 50px; width: 100px;'})


@admin.register(Facet)
class FacetAdmin(admin.ModelAdmin):
    """Admin configuration for Facet model."""

    form = FacetAdminForm
    list_display = ('name', 'color_preview', 'cardinality')
    search_fields = ('name',)
    prepopulated_fields = {'slug': ('name',)}
    list_filter = ('cardinality',)

    def color_preview(self, obj):
        return format_html('<span style="color: {}; font-weight: bold;">■ {}</span>', obj.color, obj.color)


@admin.register(Tag)
class TagAdmin(admin.ModelAdmin):
    """Admin configuration for Tag model."""

    list_display = ('__str__', 'facet_with_color')
    list_filter = ('facet',)
    search_fields = ('name', 'facet__name')

    def facet_with_color(self, obj):
        if obj.facet:
            return format_html('<span style="color: {}; font-weight: bold;">{}</span>', obj.facet.color, obj.facet.name)
        return '-'
    facet_with_color.short_description = 'Facet'


@admin.register(ThingLink)
class ThingLinkAdmin(admin.ModelAdmin):
    """Admin configuration for ThingLink model."""

    list_display = ('thing', 'title', 'url', 'uploaded_at')
    list_filter = ('thing',)
    search_fields = ('title', 'url')