from django.contrib import admin
from .models import DispatchResponseControl,GroupDispatch,SLAConfig,Ticket,TicketAccessGrant,TicketCategory,TicketEvent,TicketReadState,TicketTag
@admin.register(Ticket)
class TicketAdmin(admin.ModelAdmin):
    list_display=("ticket_number","subject","owning_unit","delivery_type","status","priority","owner","last_activity_at")
    list_filter=("owning_unit","assigned_unit","delivery_type","status","priority","category","tags")
    search_fields=("ticket_number","subject","customer__mobile","customer__customer_profile__organization_name")
    filter_horizontal=("tags",)

    def get_readonly_fields(self, request, obj=None):
        if obj and obj.group_dispatch_id and DispatchResponseControl.objects.filter(dispatch_id=obj.group_dispatch_id).exists():
            return ("group_dispatch", "delivery_type", "customer", "created_by")
        return super().get_readonly_fields(request, obj)

    def get_queryset(self, request):
        from .dispatch_responses import managed_ticket_q
        return super().get_queryset(request).filter(managed_ticket_q(request.user)).distinct()


class DispatchTicketInline(admin.TabularInline):
    model = Ticket
    extra = 0
    fields = ("ticket_number", "customer", "status", "last_activity_at")
    readonly_fields = fields
    can_delete = False

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


@admin.register(GroupDispatch)
class GroupDispatchAdmin(admin.ModelAdmin):
    list_display = ("subject", "unit", "contact_group", "status", "recipient_count", "dispatched_at")
    list_filter = ("unit", "status", "contact_group")
    search_fields = ("subject", "created_by__username")
    readonly_fields = ("recipient_count", "dispatched_at")
    inlines = (DispatchTicketInline,)

    def get_readonly_fields(self, request, obj=None):
        fields = super().get_readonly_fields(request, obj)
        if obj and DispatchResponseControl.objects.filter(dispatch_id=obj.pk).exists():
            return fields + ("unit", "operation_type", "created_by", "contact_group")
        return fields

    def get_queryset(self, request):
        from .policies import DispatchPolicy
        from django.db.models import Q
        return super().get_queryset(request).filter(Q(response_control__isnull=True) | Q(pk__in=DispatchPolicy.visible_dispatches(request.user)))


@admin.register(DispatchResponseControl)
class DispatchResponseControlAdmin(admin.ModelAdmin):
    list_display = ("dispatch", "mode", "notify_sms", "opened_at", "opened_by")
    readonly_fields = tuple(field.name for field in DispatchResponseControl._meta.fields)

    def get_queryset(self, request):
        from .policies import DispatchPolicy
        return super().get_queryset(request).filter(dispatch__in=DispatchPolicy.visible_dispatches(request.user))

    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(TicketCategory)
class TicketCategoryAdmin(admin.ModelAdmin):
    list_display=("title","unit","sort_order","show_in_customer_form","is_active")
    list_filter=("unit","show_in_customer_form","is_active")
    search_fields=("title","description","search_keywords","unit__name","unit__search_keywords")
    list_editable=("is_active","show_in_customer_form","sort_order")


admin.site.register([SLAConfig,TicketAccessGrant,TicketEvent,TicketReadState,TicketTag])