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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_chat( self, chat_id: Union[int, str] ) -> "pyrogram.Chat": """Use this method to get up to date information about the chat. Information include current name of the user for one-on-one conversations, current username of a user, group or channel, etc. Args: chat_id (``int`` | ``str``):
 Unique identifier (int) or username (str) of the target chat. Unique identifier for the target chat in form of a *t.me/joinchat/* link, identifier (int) or username of the target channel/supergroup (in the format @username). Returns: On success, a :obj:`Chat <pyrogram.Chat>` object is returned. Raises: :class:`RPCError <pyrogram.RPCError>` in case of a Telegram RPC error. ``ValueError`` in case the chat invite link refers to a chat you haven't joined yet. """

        match = self.INVITE_LINK_RE.match(str(chat_id))

        if match:
            h = match.group(1)

            r = self.send(
                functions.messages.CheckChatInvite(
                    hash=h
                )
            )

            if isinstance(r, types.ChatInvite):
                raise ValueError("You haven't joined \"t.me/joinchat/{}\" yet".format(h))

            self.fetch_peers([r.chat])

            if isinstance(r.chat, types.Chat):
                chat_id = -r.chat.id

            if isinstance(r.chat, types.Channel):
                chat_id = int("-100" + str(r.chat.id))

        peer = self.resolve_peer(chat_id)

        if isinstance(peer, types.InputPeerChannel):
            r = self.send(functions.channels.GetFullChannel(channel=peer))
        elif isinstance(peer, (types.InputPeerUser, types.InputPeerSelf)):
            r = self.send(functions.users.GetFullUser(id=peer))
        else:
            r = self.send(functions.messages.GetFullChat(chat_id=peer.chat_id))

        return pyrogram.Chat._parse_full(self, r)