#
# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
# Copyright 2023 The vLLM team.
#
# 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.
#
"""
Compare the outputs of vLLM with and without aclgraph.

Run `pytest tests/e2e/pull_request/two_card/test_external_launcher.py`.
"""

import os
import subprocess
import sys
from pathlib import Path
from unittest.mock import patch

import huggingface_hub
import pytest
import torch_npu
from modelscope import snapshot_download  # type: ignore

from tests.e2e.conftest import wait_until_npu_memory_free

MODELS = ["Qwen/Qwen3-0.6B"]
MOE_MODELS = ["Qwen/Qwen3-30B-A3B"]
DEVICE_NAME = torch_npu.npu.get_device_name(0)[:10]
REPO_ROOT = Path(__file__).resolve().parents[4]
EXTERNAL_LAUNCHER_SCRIPT = REPO_ROOT / "examples" / "offline_external_launcher.py"
EXTERNAL_LAUNCHER_TIMEOUT_S = 720


def _decode_output(output):
    if output is None:
        return ""
    if isinstance(output, bytes):
        return output.decode(errors="ignore")
    return output


def _run_external_launcher(cmd, env):
    env = env.copy()
    env["PYTHONUNBUFFERED"] = "1"

    print(f"Running subprocess: {' '.join(cmd)}")
    try:
        proc = subprocess.run(
            cmd,
            env=env,
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,
            timeout=EXTERNAL_LAUNCHER_TIMEOUT_S,
        )
    except subprocess.TimeoutExpired as exc:
        print(f"Subprocess timed out after {EXTERNAL_LAUNCHER_TIMEOUT_S} seconds.")
        output = _decode_output(exc.output)
        if output:
            print(output)
        else:
            print("No subprocess output captured before timeout.")
        raise

    output = _decode_output(proc.stdout)
    print(output)
    return proc, output


@pytest.mark.parametrize("model", MODELS)
@patch.dict(os.environ, {"HCCL_BUFFSIZE": "500"})
def test_qwen3_external_launcher(model):
    env = os.environ.copy()
    # TODO: Change to 2 when ci machine has 4 cards
    cmd = [
        sys.executable,
        str(EXTERNAL_LAUNCHER_SCRIPT),
        "--model",
        model,
        "--tp-size",
        "1",
        "--node-size",
        "1",
        "--node-rank",
        "0",
        "--proc-per-node",
        "2",
        "--trust-remote-code",
    ]

    proc, output = _run_external_launcher(cmd, env)

    assert "TP RANKS: [0]" in output
    assert "TP RANKS: [1]" in output
    assert "Generated text:" in output
    assert proc.returncode == 0


@pytest.mark.parametrize("model", MOE_MODELS)
@wait_until_npu_memory_free(target_free_percentage=0.7)
def test_qwen3_moe_external_launcher_ep_tp2(model):
    env = os.environ.copy()
    # TODO: Change to 2 when ci machine has 4 cards
    cmd = [
        sys.executable,
        str(EXTERNAL_LAUNCHER_SCRIPT),
        "--model",
        model,
        "--tp-size",
        "2",
        "--node-size",
        "1",
        "--node-rank",
        "0",
        "--proc-per-node",
        "2",
        "--trust-remote-code",
        "--enable-expert-parallel",
    ]

    proc, output = _run_external_launcher(cmd, env)

    assert "TP RANKS: [0, 1]" in output
    assert "Generated text:" in output
    assert proc.returncode == 0


@patch.dict(os.environ, {"VLLM_ASCEND_ENABLE_NZ": "0"})
@wait_until_npu_memory_free(target_free_percentage=0.7)
def test_qwen3_external_launcher_with_sleepmode():
    env = os.environ.copy()
    # TODO: Change to 2 when ci machine has 4 cards
    cmd = [
        sys.executable,
        str(EXTERNAL_LAUNCHER_SCRIPT),
        "--model",
        "Qwen/Qwen3-8B",
        "--tp-size",
        "1",
        "--node-size",
        "1",
        "--node-rank",
        "0",
        "--proc-per-node",
        "2",
        "--trust-remote-code",
        "--enable-sleep-mode",
        "--temperature",
        "0",
        "--model-weight-gib",
        "16",
    ]

    proc, output = _run_external_launcher(cmd, env)

    assert "Generated text:" in output
    assert "Sleep and wake up successfully!!" in output
    assert proc.returncode == 0


@patch.dict(os.environ, {"VLLM_ASCEND_ENABLE_NZ": "0"})
@wait_until_npu_memory_free(target_free_percentage=0.7)
def test_qwen3_external_launcher_with_sleepmode_level2():
    env = os.environ.copy()
    model_path = snapshot_download(
        "Qwen/Qwen3-8B",
        local_files_only=huggingface_hub.constants.HF_HUB_OFFLINE,
    )
    # TODO: Add moe model test
    cmd = [
        sys.executable,
        str(EXTERNAL_LAUNCHER_SCRIPT),
        "--model",
        model_path,
        "--tp-size",
        "1",
        "--node-size",
        "1",
        "--node-rank",
        "0",
        "--proc-per-node",
        "2",
        "--trust-remote-code",
        "--enable-sleep-mode",
        "--temperature",
        "0",
        "--model-weight-gib",
        "16",
        "--sleep-mode-level",
        "2",
    ]

    proc, output = _run_external_launcher(cmd, env)

    assert "Generated text:" in output
    assert "Sleep and wake up successfully!!" in output
    assert proc.returncode == 0


@pytest.mark.skipif(
    DEVICE_NAME != "Ascend910B",
    reason="This test is only for Ascend910B devices.",
)
@pytest.mark.parametrize("model", MODELS)
@wait_until_npu_memory_free(target_free_percentage=0.7)
@patch.dict(os.environ, {"VLLM_ASCEND_ENABLE_MATMUL_ALLREDUCE": "1", "HCCL_BUFFSIZE": "500"})
def test_qwen3_external_launcher_with_matmul_allreduce(model):
    env = os.environ.copy()
    cmd = [
        sys.executable,
        str(EXTERNAL_LAUNCHER_SCRIPT),
        "--model",
        model,
        "--trust-remote-code",
    ]

    proc, output = _run_external_launcher(cmd, env)

    assert "Generated text:" in output
    assert proc.returncode == 0