# Copyright 2024 Bytedance Ltd. and/or its affiliates
#
# 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.

from typing import Dict

from verl.single_controller.base import ResourcePool, WorkerGroup

from .worker import DistGlobalInfo, DistRankInfo


class MegatronWorkerGroup(WorkerGroup):
    def __init__(self, resource_pool: ResourcePool, **kwargs):
        super().__init__(resource_pool=resource_pool, **kwargs)
        self._megatron_rank_info = None
        self._megatron_global_info: DistGlobalInfo = None

    def init_megatron(self, default_megatron_kwargs: Dict = None):
        raise NotImplementedError("MegatronWorkerGroup.init_megatron should be overwritten")

    def get_megatron_rank_info(self, rank: int) -> DistRankInfo:
        assert 0 <= rank < self.world_size, f"rank must be from [0, world_size), Got {rank}"
        return self._megatron_rank_info[rank]

    @property
    def tp_size(self):
        assert self._megatron_global_info is not None, "MegatronWorkerGroup._megatron_global_info must be initialized"
        return self._megatron_global_info.tp_size

    @property
    def dp_size(self):
        assert self._megatron_global_info is not None, "MegatronWorkerGroup._megatron_global_info must be initialized"
        return self._megatron_global_info.dp_size

    @property
    def pp_size(self):
        assert self._megatron_global_info is not None, "MegatronWorkerGroup._megatron_global_info must be initialized"
        return self._megatron_global_info.pp_size

    @property
    def cp_size(self):
        assert self._megatron_global_info is not None, "MegatronWorkerGroup._megatron_global_info must be initialized"
        return self._megatron_global_info.cp_size

    def get_megatron_global_info(self):
        return self._megatron_global_info