from unittest.mock import MagicMock, patch

import pytest
from vllm.config import ParallelConfig

from vllm_ascend.distributed.parallel_state import (
    _FLASHCOMM2_ODP, _FLASHCOMM2_OTP, _LMTP, _MC2, _OTP, _P_TP,
    destroy_ascend_model_parallel, get_flashcomm2_odp_group,
    get_flashcomm2_otp_group, get_lmhead_tp_group, get_mc2_group,
    get_otp_group, get_p_tp_group, init_ascend_model_parallel)


@pytest.fixture
def parallel_config():
    return ParallelConfig(
        data_parallel_size=2,
        tensor_parallel_size=4,
        pipeline_parallel_size=2,
    )


@pytest.fixture
def mock_distributed():
    with patch('torch.distributed.is_initialized', return_value=True), \
         patch('torch.distributed.get_world_size', return_value=16), \
         patch('torch.distributed.get_backend', return_value='nccl'), \
         patch('vllm_ascend.distributed.parallel_state.get_world_group') as mock_group, \
         patch('vllm_ascend.distributed.parallel_state.get_tp_group') as mock_tp_group:
        mock_group.return_value.local_rank = 0
        mock_group.return_value.device_group = MagicMock()
        mock_tp_group.return_value.world_size = 4
        yield


def test_init_ascend_model_parallel(mock_distributed, parallel_config):
    mock_ascend_config = MagicMock()
    mock_ascend_config.finegrained_tp_config.lmhead_tensor_parallel_size = 2
    mock_ascend_config.finegrained_tp_config.oproj_tensor_parallel_size = 2
    mock_ascend_config.finegrained_tp_config.embedding_tensor_parallel_size = 2
    mock_ascend_config.finegrained_tp_config.mlp_tensor_parallel_size = 2
    mock_ascend_config.flashcomm2_oproj_tensor_parallel_size = 2
    mock_ascend_config.pd_tp_ratio = 2
    mock_ascend_config.num_head_replica = 0
    mock_ascend_config.pd_head_ratio = 2
    mock_vllm_config = MagicMock()
    mock_vllm_config.kv_transfer_config.is_kv_producer = True
    mock_envs_ascend = MagicMock()
    mock_envs_ascend.VLLM_ASCEND_FLASHCOMM2_PARALLEL_SIZE = 2
    mock_envs_ascend.VLLM_ASCEND_ENABLE_CONTEXT_PARALLEL = 0
    with patch('vllm_ascend.distributed.parallel_state.model_parallel_initialized', return_value=False), \
         patch('vllm_ascend.distributed.parallel_state.init_model_parallel_group'), \
         patch('vllm_ascend.distributed.parallel_state.get_current_vllm_config', return_value=mock_vllm_config), \
         patch('vllm_ascend.distributed.parallel_state.get_ascend_config', return_value=mock_ascend_config), \
         patch('vllm_ascend.utils.envs_ascend', new=mock_envs_ascend), \
         patch('vllm_ascend.utils.get_ascend_config', return_value=mock_ascend_config):
        init_ascend_model_parallel(parallel_config)

        mc2_group = get_mc2_group()
        lmheadtp_group = get_lmhead_tp_group()
        otp_group = get_otp_group()
        flashcomm2_otp_group = get_flashcomm2_otp_group()
        flashcomm2_odp_group = get_flashcomm2_odp_group()
        p_tp_group = get_p_tp_group()
        assert mc2_group is not None
        assert otp_group is not None
        assert flashcomm2_otp_group is not None
        assert flashcomm2_odp_group is not None
        assert lmheadtp_group is not None
        assert p_tp_group is not None

        destroy_ascend_model_parallel()
        assert _MC2 is None
        assert _LMTP is None
        assert _OTP is None
        assert _FLASHCOMM2_OTP is None
        assert _FLASHCOMM2_ODP is None
        assert _P_TP is None
