from utils.admin_base import CRMModelAdmin
from utils.admin_excel import excel_response
from apps.shop.admin_import import ProductImportAdminMixin
from apps.shop.import_models import ProductImportBatch

from django.contrib import admin
from django.urls import reverse
from django.utils.html import format_html

from apps.shop.models import ProductCategory, Product, Order, OrderItem, Cart, ProductType
from apps.shop.ordering import category_ordering, product_ordering


def export_products(queryset):
    headers = ('فضای کاری', 'دسته', 'محصول', 'کد محصول', 'قیمت', 'ترتیب نمایش دسته', 'ترتیب نمایش محصول', 'ترتیب اکسل دسته', 'ترتیب اکسل محصول', 'فقط نمایش', 'ویژگی‌ها')
    categories = {category.pk: (category.name, category.parent_id) for category in
                  ProductCategory.objects.filter(sys_ws_id__in=queryset.values('sys_ws_id'))}
    def path(category_id):
        names, visited = [], set()
        while category_id in categories and category_id not in visited:
            visited.add(category_id)
            name, category_id = categories[category_id]
            names.append(name)
        return '/'.join(reversed(names))
    rows = ((item.sys_ws.name, path(item.category_id), item.name, item.acc_code, item.price,
             item.category.order_cat, item.order_prd, item.category.excel_order, item.excel_order,
             item.view_only, item.attr) for item in queryset.select_related('sys_ws', 'category').iterator())
    return excel_response(headers, rows, 'products.xlsx')


class ProductInline(admin.TabularInline):
    model = Product
    fields = ('name', 'price', 'order_prd', 'excel_order')
    extra = 0
    show_change_link = True
    readonly_fields = ('name', 'price')
    can_delete = False

    def has_add_permission(self, request, obj=None):
        return False


@admin.register(ProductType)
class ProductTypeAdmin(CRMModelAdmin):
    pass


@admin.register(ProductCategory)
class ProductCategoryAdmin(CRMModelAdmin):
    list_display = ('name', 'sys_ws', 'parent', 'order_cat', 'excel_order')
    list_editable = ('order_cat', 'excel_order')
    list_filter = ('sys_ws',)
    search_fields = ('name',)
    inlines = (ProductInline,)
    actions = ('export_display_order', 'export_excel_order')

    @admin.action(description='خروجی اکسل دسته‌ها با ترتیب نمایش فعلی')
    def export_display_order(self, request, queryset):
        return self.export_categories(queryset)

    @admin.action(description='خروجی اکسل دسته‌ها با ترتیب مستقل اکسل')
    def export_excel_order(self, request, queryset):
        return self.export_categories(queryset.order_by(*category_ordering(excel=True)))

    def export_categories(self, queryset):
        return excel_response(('فضای کاری', 'دسته', 'ترتیب نمایش', 'ترتیب اکسل'),
                              queryset.values_list('sys_ws__name', 'name', 'order_cat', 'excel_order'), 'categories.xlsx')


@admin.register(Product)
class ProductAdmin(ProductImportAdminMixin, CRMModelAdmin):
    list_display = ('name', 'category', 'sys_ws', 'price', 'order_prd', 'excel_order', 'view_only')
    list_editable = ('order_prd', 'excel_order')
    list_filter = ('sys_ws', 'category', 'view_only')
    search_fields = ('name', 'category__name', 'acc_code')
    list_select_related = ('category', 'sys_ws')
    actions = ('export_display_order', 'export_excel_order')

    @admin.action(description='خروجی اکسل محصولات با ترتیب نمایش فعلی')
    def export_display_order(self, request, queryset):
        return export_products(queryset)

    @admin.action(description='خروجی اکسل محصولات با ترتیب مستقل اکسل')
    def export_excel_order(self, request, queryset):
        return export_products(queryset.order_by(*product_ordering(excel=True)))


@admin.register(Order)
class OrderAdmin(CRMModelAdmin):
    list_display = ('id', 'customer', 'sys_ws', 'total_price', 'factor_type', 'factor_status', 'view_at', 'created_at')


@admin.register(OrderItem)
class OrderItemAdmin(CRMModelAdmin):
    list_display = ('id', 'order', 'product', 'product_name', 'price', 'amount')
    search_fields = ('product_name', 'product__name', 'order__customer__name_family')


@admin.register(Cart)
class CartAdmin(CRMModelAdmin):
    list_display = ('id', 'cuser_role', 'product', 'quantity', 'sys_ws', 'updated_at')


@admin.register(ProductImportBatch)
class ProductImportBatchAdmin(CRMModelAdmin):
    list_display = ("id", "filename", "sys_ws", "created_by", "summary", "created_at", "confirmed_at")
    search_fields = ("filename", "created_by__username")
    exclude = ("payload", "fingerprint", "result")
    sensitive_fields = ("payload", "fingerprint", "result")
    actions = None

    def get_readonly_fields(self, request, obj=None):
        fields = tuple(field.name for field in self.model._meta.fields if field.name not in self.exclude)
        return (*fields, 'summary', 'report_link') if obj and obj.created_by_id == request.user.pk else (*fields, 'summary')

    @admin.display(description='خلاصه نتیجه')
    def summary(self, obj):
        result = obj.result
        status = 'ثبت نهایی' if obj.confirmed_at else 'پیش‌نمایش'
        return f"{status} | ایجاد: {result.get('created', 0)} | به‌روزرسانی: {result.get('updated', 0)} | خطا: {result.get('errors', 0)}"

    @admin.display(description='گزارش ردیف‌ها')
    def report_link(self, obj):
        return format_html('<a href="{}">دریافت اکسل گزارش</a>', reverse('admin:shop_product_import_report', args=[obj.pk]))

    def has_add_permission(self, request):
        return False

    def has_change_permission(self, request, obj=None):
        return False

    def has_delete_permission(self, request, obj=None):
        return False