#!/usr/bin/env python3
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from pktverify.packet import Packet
from pktverify.packet_filter import PacketFilter


class VerifyResult(object):
    """
    Represents a verification result of a packet.
    """
    __slots__ = ('_packet_found', '_packet_indexes', '_seek_indexes')

    def __init__(self):
        self._packet_found = {}
        self._packet_indexes = {}
        self._seek_indexes = {}

    def record_last(self, name: str, pkts: PacketFilter) -> None:
        """
        Record the information of the last found packet.

        :param name: The record name.
        :param pkts: The packet filter.
        """
        assert name not in self._packet_found, f'duplicate name: {name}'
        self._packet_found[name] = pkts.last()
        self._packet_indexes[name] = pkts.last_index
        self._seek_indexes[name] = pkts.index

    def packet_index(self, name: str) -> int:
        """
        Returns a recorded packet index.

        :param name: The record name.
        :return: The packet index.
        """
        return self._packet_indexes[name]

    def packet(self, name: str) -> Packet:
        """
        Returns the recorded packet.

        :param name: The record name.
        :return: The packet.
        """
        return self._packet_found[name]

    def seek_index(self, name: str) -> tuple:
        """
        Returns the recorded seek index.

        :param name: The record name.
        :return: The seek index.
        """
        return self._seek_indexes[name]

    def __str__(self):
        return "VerifyResult%s" % self._packet_found