from django.contrib import admin

from .models import ActivityLog, CompanySettings, NumberSequence


@admin.register(CompanySettings)
class CompanySettingsAdmin(admin.ModelAdmin):
    def has_add_permission(self, request):
        return not CompanySettings.objects.exists()

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


@admin.register(ActivityLog)
class ActivityLogAdmin(admin.ModelAdmin):
    list_display = ("created_at", "username", "action", "object_type", "object_repr")
    list_filter = ("action",)
    search_fields = ("username", "object_repr")
    readonly_fields = [f.name for f in ActivityLog._meta.fields]

    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


@admin.register(NumberSequence)
class NumberSequenceAdmin(admin.ModelAdmin):
    readonly_fields = ("key", "last_value")

    def has_add_permission(self, request):
        return False

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