# Copyright 2024 Huawei Technologies Co., Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============================================================================
"""Telechat predict utils."""

from collections import deque
import copy


class History:
    """Init from a list of dict, use deque to meet some special situation."""
    def __init__(self, tokenizer, history):
        self.input_history = deque()
        self.tokenizer = tokenizer
        if history:
            self._transfer_from_list(history)

    def _transfer_from_list(self, history):
        for message in history:
            content = message.get("content")
            # the token result may not be equal to the result model gen
            message.update(self.tokenizer(content))
            self.input_history.append(message)

    def __len__(self):
        return self.input_history.__len__()

    def __str__(self):
        return self.input_history.__str__()

    def __copy__(self):
        new_instance = type(self)(self.tokenizer, [])
        new_instance.input_history = copy.copy(self.input_history)
        return new_instance

    def __deepcopy__(self, memodict=None):
        new_instance = type(self)(self.tokenizer, [])
        new_instance.input_history = copy.deepcopy(self.input_history)
        return new_instance

    def append(self, message):
        content = message.get("content")
        if "input_ids" not in message or "attention_mask" not in message:
            message.update(self.tokenizer(content))
        self.input_history.append(message)

    def append_left(self, message):
        content = message.get("content")
        if "input_ids" not in message or "attention_mask" not in message:
            message.update(self.tokenizer(content))
        self.input_history.appendleft(message)

    def pop(self):
        x = self.input_history.pop()
        return x

    def pop_left(self):
        x = self.pop_left()
        return x

    def update(self, message):
        self.input_history.pop()
        self.append(message)