# Copyright (C) 2015-2019 Virgil Security, Inc.
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# Lead Maintainer: Virgil Security Inc. <support@virgilsecurity.com>


from ctypes import *
from ._c_bridge import VscfKeyRecipientInfoList
from .key_recipient_info import KeyRecipientInfo


class KeyRecipientInfoList(object):
    """Handles a list of "key recipient info" class objects."""

    def __init__(self):
        """Create underlying C context."""
        self._lib_vscf_key_recipient_info_list = VscfKeyRecipientInfoList()
        self.ctx = self._lib_vscf_key_recipient_info_list.vscf_key_recipient_info_list_new()

    def __delete__(self, instance):
        """Destroy underlying C context."""
        self._lib_vscf_key_recipient_info_list.vscf_key_recipient_info_list_delete(self.ctx)

    def add(self, key_recipient_info):
        """Add new item to the list.
        Note, ownership is transfered."""
        self._lib_vscf_key_recipient_info_list.vscf_key_recipient_info_list_add(self.ctx, key_recipient_info.ctx)

    def has_item(self):
        """Return true if given list has item."""
        result = self._lib_vscf_key_recipient_info_list.vscf_key_recipient_info_list_has_item(self.ctx)
        return result

    def item(self):
        """Return list item."""
        result = self._lib_vscf_key_recipient_info_list.vscf_key_recipient_info_list_item(self.ctx)
        instance = KeyRecipientInfo.use_c_ctx(result)
        return instance

    def has_next(self):
        """Return true if list has next item."""
        result = self._lib_vscf_key_recipient_info_list.vscf_key_recipient_info_list_has_next(self.ctx)
        return result

    def next(self):
        """Return next list node if exists, or NULL otherwise."""
        result = self._lib_vscf_key_recipient_info_list.vscf_key_recipient_info_list_next(self.ctx)
        instance = KeyRecipientInfoList.take_c_ctx(result)
        return instance

    def has_prev(self):
        """Return true if list has previous item."""
        result = self._lib_vscf_key_recipient_info_list.vscf_key_recipient_info_list_has_prev(self.ctx)
        return result

    def prev(self):
        """Return previous list node if exists, or NULL otherwise."""
        result = self._lib_vscf_key_recipient_info_list.vscf_key_recipient_info_list_prev(self.ctx)
        instance = KeyRecipientInfoList.take_c_ctx(result)
        return instance

    def clear(self):
        """Remove all items."""
        self._lib_vscf_key_recipient_info_list.vscf_key_recipient_info_list_clear(self.ctx)

    @classmethod
    def take_c_ctx(cls, c_ctx):
        inst = cls.__new__(cls)
        inst._lib_vscf_key_recipient_info_list = VscfKeyRecipientInfoList()
        inst.ctx = c_ctx
        return inst

    @classmethod
    def use_c_ctx(cls, c_ctx):
        inst = cls.__new__(cls)
        inst._lib_vscf_key_recipient_info_list = VscfKeyRecipientInfoList()
        inst.ctx = inst._lib_vscf_key_recipient_info_list.vscf_key_recipient_info_list_shallow_copy(c_ctx)
        return inst
