from typing import Dict


class CRUDPermissionsMixin:
    view_permission_codes: tuple = ()
    create_permission_codes: tuple = ()
    destroy_permission_codes: tuple = ()
    update_permission_codes: tuple = ()
    action_permissions: Dict[str, tuple] = {}

    def get_default_action_permissions(self):
        return {
            "list": self.view_permission_codes,
            "retrieve": self.view_permission_codes,
            "create": self.create_permission_codes,
            "update": self.update_permission_codes,
            "partial_update": self.update_permission_codes,
            "destroy": self.destroy_permission_codes,
        }

    def has_perm_for_action(self, request, action) -> bool:
        default_action_permissions = self.get_default_action_permissions()
        action_permissions = {**default_action_permissions, **self.action_permissions}
        perms = action_permissions.get(action, ())
        return request.user.has_perms(perms)

    def has_permission(self, request, view):
        user = request.user

        if user.is_superuser:
            return True

        if not user.is_staff:
            return False

        return self.has_perm_for_action(request=request, action=view.action)