"""Employee API viewset composition root."""

from rest_framework import filters, viewsets
from rest_framework.permissions import IsAuthenticated

from ...permissions import AdminOrActionOrModelPerms, IsSelfOrStaff
from ..serializers import EmployeeListSerializer, EmployeeSerializer
from .employee_mixins import (
    EmployeeLinkedTasksMixin,
    EmployeePersistenceMixin,
    EmployeeProfileMixin,
    EmployeeQueryMixin,
    EmployeeStatisticsMixin,
)


class EmployeeViewSet(
    EmployeeQueryMixin,
    EmployeeLinkedTasksMixin,
    EmployeePersistenceMixin,
    EmployeeStatisticsMixin,
    EmployeeProfileMixin,
    viewsets.ModelViewSet,
):
    """
    /api/v1/employees/

    CRUD для сотрудников + профиль текущего пользователя.

    Доступ:
      - GET list/retrieve          — только аутентифицированные пользователи.
      - POST (create)              — только staff/superuser.
            - PATCH/PUT/DELETE {id}      — staff/superuser ИЛИ пользователи
                с модельными правами.
            - GET/PATCH /employees/me/   — только аутентифицированные;
                PATCH правит профиль текущего пользователя.

    Поиск: last_name, first_name, patronymic, email, phone_number

    LDAP синхронизация происходит через Django сигналы (signals_ldap.py).
    """

    serializer_class = EmployeeSerializer
    filter_backends = [filters.SearchFilter, filters.OrderingFilter]
    search_fields = [
        "last_name",
        "first_name",
        "patronymic",
        "email",
        "phone_number",
    ]
    ordering_fields = ["last_name", "first_name", "created_at", "id"]
    ordering = ["last_name", "first_name"]

    def get_permissions(self):
        if self.action in {"create", "destroy"}:
            return [IsAuthenticated(), AdminOrActionOrModelPerms()]
        if self.action in {"update", "partial_update"}:
            return [
                IsAuthenticated(),
                (IsSelfOrStaff | AdminOrActionOrModelPerms)(),
            ]
        return [IsAuthenticated()]

    def get_serializer_class(self):
        if self.action == "list":
            return EmployeeListSerializer
        return EmployeeSerializer