fix final invoice and certificatre

invoices/admin.py

@@ -44,11 +44,11 @@ class PaymentInline(admin.TabularInline):
 
 @admin.register(Invoice)
 class InvoiceAdmin(SimpleHistoryAdmin):
-    list_display = ['name', 'process_instance', 'customer', 'status_display', 'final_amount', 'paid_amount', 'remaining_amount', 'due_date']
+    list_display = ['name', 'process_instance', 'customer', 'status_display', 'final_amount', 'paid_amount_display', 'remaining_amount_display', 'due_date']
     list_filter = ['status', 'created', 'due_date', 'process_instance__process']
     search_fields = ['name', 'customer__username', 'customer__first_name', 'customer__last_name', 'notes']
     prepopulated_fields = {'slug': ('name',)}
-    readonly_fields = ['deleted_at', 'created', 'updated', 'total_amount', 'discount_amount', 'final_amount', 'paid_amount', 'remaining_amount']
+    readonly_fields = ['deleted_at', 'created', 'updated', 'total_amount', 'discount_amount', 'final_amount', 'paid_amount_display', 'remaining_amount_display']
     inlines = [InvoiceItemInline, PaymentInline]
     ordering = ['-created']
 
@@ -56,6 +56,16 @@ class InvoiceAdmin(SimpleHistoryAdmin):
         return mark_safe(obj.get_status_display_with_color())
     status_display.short_description = "وضعیت"
 
+    def paid_amount_display(self, obj):
+        return f"{obj.get_paid_amount():,.0f} تومان"
+    paid_amount_display.short_description = "مبلغ پرداخت شده"
+
+    def remaining_amount_display(self, obj):
+        amount = obj.get_remaining_amount()
+        color = "green" if amount <= 0 else "red"
+        return format_html('<span style="color: {};">{:,.0f} تومان</span>', color, amount)
+    remaining_amount_display.short_description = "مبلغ باقی‌مانده"
+
 @admin.register(Payment)
 class PaymentAdmin(SimpleHistoryAdmin):
     list_display = ['invoice', 'amount', 'payment_method', 'payment_date', 'created_by']