from entry import Entry


class Queue:
    def __init__(self) -> None:
        self._queue: list[Entry] = []
        self.cursor = 0

    def append(self, entry: Entry) -> None:
        self._queue.append(entry)

    def remove(self, index: int) -> Entry | None:
        if 0 < index < len(self._queue):
            return self._queue.pop()

    def move(self, frm: int, to: int) -> None:
        if 0 < frm < len(self._queue) and 0 < to < len(self._queue) and frm != to:
            self._queue.insert(to, self._queue.pop(frm))

    def __getitem__(self, index: int) -> Entry | None:
        if index < 0 or index > len(self._queue):
            return None
        return self._queue[index]