# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
"""Test model set-up and weight loading for quark-quantized models.

Run `pytest tests/quantization/test_quark.py`.

See also `tests/kernels/moe/test_mxfp4_moe.py`.
"""

import importlib.metadata
import os
from dataclasses import dataclass
from importlib.util import find_spec

import huggingface_hub
import lm_eval
import pytest
import torch
from packaging import version

from vllm.model_executor.layers.quantization.quark.quark import (  # noqa: E501
    QuarkLinearMethod, QuarkW8A8Fp8, QuarkW8A8Int8)
from vllm.platforms import current_platform

from .reference_mxfp4 import dq_mxfp4_torch, qdq_mxfp4_torch
from ..utils import models_path_prefix

QUARK_MXFP4_AVAILABLE = find_spec("quark") is not None and version.parse(
    importlib.metadata.version("amd-quark")) >= version.parse('0.8.99')

if QUARK_MXFP4_AVAILABLE:
    from quark.torch.export.nn.modules.realquantizer import (
        StaticScaledRealQuantizer)
    from quark.torch.kernel import mx as mx_kernel
    from quark.torch.quantization.config.config import FP4PerGroupSpec

try:
    huggingface_hub.list_repo_refs(
        "amd/Llama-3.3-70B-Instruct-WMXFP4-AMXFP4-KVFP8-Scale-UINT8-SQ")
    HF_HUB_AMD_ORG_ACCESS = True
except huggingface_hub.errors.RepositoryNotFoundError:
    HF_HUB_AMD_ORG_ACCESS = False


@pytest.fixture(scope="function", autouse=True)
def enable_pickle(monkeypatch):
    """`LLM.apply_model` requires pickling a function."""
    monkeypatch.setenv("VLLM_ALLOW_INSECURE_SERIALIZATION", "1")


@pytest.mark.parametrize('kv_cache_dtype', ['auto', 'fp8'])
@pytest.mark.parametrize('tp', [1])
def test_quark_fp8_w_per_tensor_a_per_tensor(vllm_runner, kv_cache_dtype, tp):
    model_path = os.path.join(models_path_prefix, "amd/Llama-3.1-8B-Instruct-FP8-KV-Quark-test")
    with vllm_runner(model_path,
                     kv_cache_dtype=kv_cache_dtype,
                     tensor_parallel_size=tp) as llm:

        def check_model(model):
            layer = model.model.layers[0]

            qkv_proj = layer.self_attn.qkv_proj

            assert isinstance(qkv_proj.quant_method, QuarkLinearMethod)
            assert isinstance(qkv_proj.scheme, QuarkW8A8Fp8)

            if isinstance(qkv_proj.scheme, QuarkW8A8Fp8):
                assert len(qkv_proj.input_scale.shape) == 0
                assert qkv_proj.weight.dtype is current_platform.fp8_dtype()
                assert len(qkv_proj.weight_scale.shape) == 0

        llm.apply_model(check_model)

        output = llm.generate_greedy("Hello my name is", max_tokens=20)
        assert output


@pytest.mark.parametrize('tp', [1])
def test_quark_fp8_w_per_channel_a_per_token(vllm_runner, tp):
    model_path = "amd/Qwen2.5-1.5B-Instruct-ptpc-Quark-ts"
    with vllm_runner(model_path, tensor_parallel_size=tp) as llm:

        def check_model(model):
            layer = model.model.layers[0]

            qkv_proj = layer.self_attn.qkv_proj

            assert isinstance(qkv_proj.quant_method, QuarkLinearMethod)
            assert isinstance(qkv_proj.scheme, QuarkW8A8Fp8)

            if isinstance(qkv_proj.scheme, QuarkW8A8Fp8):
                assert qkv_proj.weight.dtype is current_platform.fp8_dtype()
                assert qkv_proj.weight_scale.shape[0] == qkv_proj.weight.shape[
                    1]
                assert qkv_proj.weight_scale.shape[1] == 1

        llm.apply_model(check_model)

        output = llm.generate_greedy("Hello my name is", max_tokens=20)
        assert output


@pytest.mark.parametrize('tp', [1])
def test_quark_int8_w_per_tensor_a_per_tensor(vllm_runner, tp):
    model_path = "amd/Llama-3.1-8B-Instruct-w-int8-a-int8-sym-test"
    with vllm_runner(model_path, tensor_parallel_size=tp) as llm:

        def check_model(model):
            layer = model.model.layers[0]

            qkv_proj = layer.self_attn.qkv_proj

            assert isinstance(qkv_proj.quant_method, QuarkLinearMethod)
            assert isinstance(qkv_proj.scheme, QuarkW8A8Int8)

        llm.apply_model(check_model)

        output = llm.generate_greedy("Hello my name is", max_tokens=20)
        assert output


def test_quark_fp8_parity(vllm_runner):
    quark_model_id = os.path.join(models_path_prefix, "amd-quark/llama-tiny-fp8-quark-quant-method")
    fp8_model_id = os.path.join(models_path_prefix, "amd-quark/llama-tiny-fp8-quant-method")

    llm_kwargs = {
        "tensor_parallel_size": 1,
        "enforce_eager": True,
        "gpu_memory_utilization": 0.1
    }
    with (vllm_runner(quark_model_id, **llm_kwargs) as
          quark_handle, vllm_runner(fp8_model_id, **llm_kwargs) as fp8_handle):

        def get_state_dict(model):
            return {k: v.cpu() for k, v in model.state_dict().items()}

        quark_state_dict, = quark_handle.apply_model(get_state_dict)
        fp8_state_dict, = fp8_handle.apply_model(get_state_dict)

    assert fp8_state_dict.keys() == quark_state_dict.keys()

    for key in fp8_state_dict:
        assert torch.equal(fp8_state_dict[key], quark_state_dict[key])


@dataclass
class ModelCase:
    model_id: str
    tp: int


@dataclass
class GSM8KAccuracyTestConfig:
    model_name: str
    excepted_value: float

    def get_model_args(self) -> str:
        return (
            f"pretrained={self.model_name},"
            "dtype=auto,add_bos_token=True,tensor_parallel_size=8,gpu_memory_utilization=0.7,max_model_len=38768"
        )


ACCURACY_CONFIGS = [
    # Private model.
    GSM8KAccuracyTestConfig(
        model_name=os.path.join(models_path_prefix, "amd/DeepSeek-R1-WMXFP4-AMXFP4-Scale-UINT8-MoE-Quant"),
        excepted_value=0.96),
]


@pytest.mark.parametrize("config", ACCURACY_CONFIGS)
@pytest.mark.skipif(not QUARK_MXFP4_AVAILABLE,
                    reason="amd-quark>=0.9 is not available")
@pytest.mark.skipif(
    not HF_HUB_AMD_ORG_ACCESS,
    reason="Read access to huggingface.co/amd is required for this test.")
def test_mxfp4_gsm8k_correctness(config: GSM8KAccuracyTestConfig):
    if torch.cuda.device_count() < 8:
        pytest.skip(
            f"This test requires >=8 gpus, got only {torch.cuda.device_count()}"
        )

    task = "gsm8k"
    rtol = 0.03

    os.environ["VLLM_USE_TRITON_FLASH_ATTN"] = "0"

    results = lm_eval.simple_evaluate(
        model="vllm",
        model_args=config.get_model_args(),
        tasks=task,
        batch_size=64,
        num_fewshot=8,
    )

    EXPECTED_VALUE = config.excepted_value
    measured_value = results["results"][task]["exact_match,strict-match"]
    assert (measured_value - rtol < EXPECTED_VALUE
            and measured_value + rtol > EXPECTED_VALUE
            ), f"Expected: {EXPECTED_VALUE} |  Measured: {measured_value}"

    del os.environ["VLLM_USE_TRITON_FLASH_ATTN"]


@pytest.mark.skipif(not QUARK_MXFP4_AVAILABLE,
                    reason="amd-quark>=0.9 is not available")
@pytest.mark.parametrize("float_dtype", [torch.bfloat16, torch.float16])
@pytest.mark.parametrize("scalings",
                         [[2.3, 0.03, 7.3, 0.1, 0.004, 17.3, 1e4, 1e-4]])
def test_mxfp4_fused_qdq_match_quark(float_dtype: torch.dtype,
                                     scalings: list[int]):
    torch.manual_seed(0)

    hidden_size = 64 * 32
    inp = (torch.rand(1, hidden_size, dtype=float_dtype, device="cuda") -
           0.5) * 2
    for i in range(hidden_size // 32):
        inp[:, i * 32:(i + 1) *
            32] = inp[:, i * 32:(i + 1) * 32] * scalings[i % len(scalings)]

    inp_kernel = inp.clone()
    inp_kernel_clone = inp_kernel.clone()

    res_hip = mx_kernel.qdq_mxfp4_hip(inp_kernel_clone, "even")
    res_torch = qdq_mxfp4_torch(inp_kernel, "even")

    for i in range(hidden_size // 32):
        assert torch.all(torch.isfinite(res_hip[:, i * 32:(i + 1) * 32]))
        assert torch.all(torch.isfinite(res_torch[:, i * 32:(i + 1) * 32]))

        torch.testing.assert_close(res_hip[:, i * 32:(i + 1) * 32],
                                   res_torch[:, i * 32:(i + 1) * 32])


@pytest.mark.skipif(not QUARK_MXFP4_AVAILABLE,
                    reason="amd-quark>=0.9 is not available")
@pytest.mark.parametrize("float_dtype", [torch.bfloat16, torch.float16])
@pytest.mark.parametrize("scalings",
                         [[2.3, 0.03, 7.3, 0.1, 0.004, 17.3, 1e4, 1e-4]])
def test_mxfp4_dequant_kernel_match_quark(float_dtype: torch.dtype,
                                          scalings: list[int]):
    qspec = FP4PerGroupSpec(
        ch_axis=-1,
        group_size=32,
        scale_format="e8m0",
        scale_calculation_mode="even",
        is_dynamic=False,
    ).to_quantization_spec()

    weight_quantizer = StaticScaledRealQuantizer(
        qspec=qspec,
        quantizer=None,
        reorder=False,
        real_quantized=True,
        float_dtype=float_dtype,
        device="cuda",
    )

    observer = qspec.observer_cls(qspec, device="cuda")

    hidden_size = 512
    shape = (11008, hidden_size)

    w = (torch.rand(shape, device="cuda", dtype=float_dtype) - 0.5) * 2

    # Make it so that different groups have different scales.
    for i in range(hidden_size // 32):
        w[:, i * 32:(i + 1) *
          32] = w[:, i * 32:(i + 1) * 32] * scalings[i % len(scalings)]

    observer(w)
    scale, _ = observer._calculate_qparams()
    weight_quantizer.scale = scale

    w_mxfp4 = weight_quantizer.to_real_quantize_params(w).to("cuda")
    weight_quantizer.maybe_convert_and_transpose_scale()

    scale = weight_quantizer.scale

    out_hip = mx_kernel.dq_mxfp4_hip(w_mxfp4, scale, float_dtype)

    out_torch = dq_mxfp4_torch(w_mxfp4, scale, float_dtype)

    assert torch.equal(out_hip, out_torch)
