# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project

from dataclasses import MISSING, Field, asdict, dataclass, field
from typing import Literal, Union

import pytest

from vllm.compilation.backends import VllmBackend
from vllm.config import (LoadConfig, ModelConfig, PoolerConfig, VllmConfig,
                         config, get_field)
from vllm.model_executor.layers.pooler import PoolingType
from vllm.platforms import current_platform


class _TestConfig1:
    pass


@dataclass
class _TestConfig2:
    a: int
    """docstring"""


@dataclass
class _TestConfig3:
    a: int = 1


@dataclass
class _TestConfig4:
    a: Union[Literal[1], Literal[2]] = 1
    """docstring"""


@pytest.mark.parametrize(("test_config", "expected_error"), [
    (_TestConfig1, "must be a dataclass"),
    (_TestConfig2, "must have a default"),
    (_TestConfig3, "must have a docstring"),
    (_TestConfig4, "must use a single Literal"),
])
def test_config(test_config, expected_error):
    with pytest.raises(Exception, match=expected_error):
        config(test_config)


def test_compile_config_repr_succeeds():
    # setup: VllmBackend mutates the config object
    config = VllmConfig()
    backend = VllmBackend(config)
    backend.configure_post_pass()

    # test that repr(config) succeeds
    val = repr(config)
    assert 'VllmConfig' in val
    assert 'inductor_passes' in val


@dataclass
class _TestConfigFields:
    a: int
    b: dict = field(default_factory=dict)
    c: str = "default"


def test_get_field():
    with pytest.raises(ValueError):
        get_field(_TestConfigFields, "a")

    b = get_field(_TestConfigFields, "b")
    assert isinstance(b, Field)
    assert b.default is MISSING
    assert b.default_factory is dict

    c = get_field(_TestConfigFields, "c")
    assert isinstance(c, Field)
    assert c.default == "default"
    assert c.default_factory is MISSING


@pytest.mark.parametrize(
    ("model_id", "expected_runner_type", "expected_task"),
    [
        ("distilbert/distilgpt2", "generate", "generate"),
        ("intfloat/multilingual-e5-small", "pooling", "embed"),
        ("jason9693/Qwen2.5-1.5B-apeach", "pooling", "classify"),
        ("cross-encoder/ms-marco-MiniLM-L-6-v2", "pooling", "score"),
        ("Qwen/Qwen2.5-Math-RM-72B", "pooling", "reward"),
        ("openai/whisper-small", "transcription", "transcription"),
    ],
)
def test_auto_task(model_id, expected_runner_type, expected_task):
    config = ModelConfig(
        model_id,
        task="auto",
        tokenizer=model_id,
        tokenizer_mode="auto",
        trust_remote_code=False,
        seed=0,
        dtype="float16",
    )

    assert config.runner_type == expected_runner_type
    assert config.task == expected_task


@pytest.mark.parametrize(("model_id", "bad_task"), [
    ("Qwen/Qwen2.5-Math-RM-72B", "generate"),
])
def test_incorrect_task(model_id, bad_task):
    with pytest.raises(ValueError, match=r"does not support the .* task"):
        ModelConfig(
            model_id,
            task=bad_task,
            tokenizer=model_id,
            tokenizer_mode="auto",
            trust_remote_code=False,
            seed=0,
            dtype="float16",
        )


MODEL_IDS_EXPECTED = [
    ("Qwen/Qwen1.5-7B", 32768),
    ("mistralai/Mistral-7B-v0.1", 4096),
    ("mistralai/Mistral-7B-Instruct-v0.2", 32768),
]


@pytest.mark.parametrize("model_id_expected", MODEL_IDS_EXPECTED)
def test_disable_sliding_window(model_id_expected):
    model_id, expected = model_id_expected
    model_config = ModelConfig(
        model_id,
        task="auto",
        tokenizer=model_id,
        tokenizer_mode="auto",
        trust_remote_code=False,
        seed=0,
        dtype="float16",
        revision=None,
        disable_sliding_window=True,
    )
    assert model_config.max_model_len == expected


def test_get_sliding_window():
    TEST_SLIDING_WINDOW = 4096
    # Test that the sliding window is correctly computed.
    # For Qwen1.5/Qwen2, get_sliding_window() should be None
    # when use_sliding_window is False.
    qwen2_model_config = ModelConfig(
        "Qwen/Qwen1.5-7B",
        task="auto",
        tokenizer="Qwen/Qwen1.5-7B",
        tokenizer_mode="auto",
        trust_remote_code=False,
        seed=0,
        dtype="float16",
        revision=None,
    )

    qwen2_model_config.hf_config.use_sliding_window = False
    qwen2_model_config.hf_config.sliding_window = TEST_SLIDING_WINDOW
    assert qwen2_model_config.get_sliding_window() is None

    qwen2_model_config.hf_config.use_sliding_window = True
    assert qwen2_model_config.get_sliding_window() == TEST_SLIDING_WINDOW

    mistral_model_config = ModelConfig(
        "mistralai/Mistral-7B-v0.1",
        task="auto",
        tokenizer="mistralai/Mistral-7B-v0.1",
        tokenizer_mode="auto",
        trust_remote_code=False,
        seed=0,
        dtype="float16",
        revision=None,
    )
    mistral_model_config.hf_config.sliding_window = None
    assert mistral_model_config.get_sliding_window() is None

    mistral_model_config.hf_config.sliding_window = TEST_SLIDING_WINDOW
    assert mistral_model_config.get_sliding_window() == TEST_SLIDING_WINDOW


@pytest.mark.skipif(current_platform.is_rocm(),
                    reason="Xformers backend is not supported on ROCm.")
def test_get_pooling_config():
    model_id = "sentence-transformers/all-MiniLM-L12-v2"
    model_config = ModelConfig(
        model_id,
        task="auto",
        tokenizer=model_id,
        tokenizer_mode="auto",
        trust_remote_code=False,
        seed=0,
        dtype="float16",
        revision=None,
    )

    pooling_config = model_config._init_pooler_config()
    assert pooling_config is not None

    assert pooling_config.normalize
    assert pooling_config.pooling_type == PoolingType.MEAN.name


@pytest.mark.skipif(current_platform.is_rocm(),
                    reason="Xformers backend is not supported on ROCm.")
def test_get_pooling_config_from_args():
    model_id = "sentence-transformers/all-MiniLM-L12-v2"
    model_config = ModelConfig(model_id,
                               task="auto",
                               tokenizer=model_id,
                               tokenizer_mode="auto",
                               trust_remote_code=False,
                               seed=0,
                               dtype="float16",
                               revision=None)

    override_pooler_config = PoolerConfig(pooling_type='CLS', normalize=True)
    model_config.override_pooler_config = override_pooler_config

    pooling_config = model_config._init_pooler_config()
    assert pooling_config is not None
    assert asdict(pooling_config) == asdict(override_pooler_config)


@pytest.mark.skipif(current_platform.is_rocm(),
                    reason="Xformers backend is not supported on ROCm.")
def test_get_bert_tokenization_sentence_transformer_config():
    bge_model_config = ModelConfig(
        model="BAAI/bge-base-en-v1.5",
        task="auto",
        tokenizer="BAAI/bge-base-en-v1.5",
        tokenizer_mode="auto",
        trust_remote_code=False,
        seed=0,
        dtype="float16",
        revision=None,
    )

    bert_bge_model_config = bge_model_config._get_encoder_config()

    assert bert_bge_model_config["max_seq_length"] == 512
    assert bert_bge_model_config["do_lower_case"]


def test_rope_customization():
    TEST_ROPE_SCALING = {"rope_type": "dynamic", "factor": 2.0}
    TEST_ROPE_THETA = 16_000_000.0
    LONGCHAT_ROPE_SCALING = {"rope_type": "linear", "factor": 8.0}

    llama_model_config = ModelConfig(
        "meta-llama/Meta-Llama-3-8B-Instruct",
        task="auto",
        tokenizer="meta-llama/Meta-Llama-3-8B-Instruct",
        tokenizer_mode="auto",
        trust_remote_code=False,
        dtype="float16",
        seed=0,
    )
    assert getattr(llama_model_config.hf_config, "rope_scaling", None) is None
    assert getattr(llama_model_config.hf_config, "rope_theta", None) == 500_000
    assert llama_model_config.max_model_len == 8192

    llama_model_config = ModelConfig(
        "meta-llama/Meta-Llama-3-8B-Instruct",
        task="auto",
        tokenizer="meta-llama/Meta-Llama-3-8B-Instruct",
        tokenizer_mode="auto",
        trust_remote_code=False,
        dtype="float16",
        seed=0,
        hf_overrides={
            "rope_scaling": TEST_ROPE_SCALING,
            "rope_theta": TEST_ROPE_THETA,
        },
    )
    assert getattr(llama_model_config.hf_config, "rope_scaling",
                   None) == TEST_ROPE_SCALING
    assert getattr(llama_model_config.hf_config, "rope_theta",
                   None) == TEST_ROPE_THETA
    assert llama_model_config.max_model_len == 16384

    longchat_model_config = ModelConfig(
        "lmsys/longchat-13b-16k",
        task="auto",
        tokenizer="lmsys/longchat-13b-16k",
        tokenizer_mode="auto",
        trust_remote_code=False,
        dtype="float16",
        seed=0,
    )
    # Check if LONGCHAT_ROPE_SCALING entries are in longchat_model_config
    assert all(
        longchat_model_config.hf_config.rope_scaling.get(key) == value
        for key, value in LONGCHAT_ROPE_SCALING.items())
    assert longchat_model_config.max_model_len == 16384

    longchat_model_config = ModelConfig(
        "lmsys/longchat-13b-16k",
        task="auto",
        tokenizer="lmsys/longchat-13b-16k",
        tokenizer_mode="auto",
        trust_remote_code=False,
        dtype="float16",
        seed=0,
        hf_overrides={
            "rope_scaling": TEST_ROPE_SCALING,
        },
    )
    assert getattr(longchat_model_config.hf_config, "rope_scaling",
                   None) == TEST_ROPE_SCALING
    assert longchat_model_config.max_model_len == 4096


@pytest.mark.skipif(current_platform.is_rocm(),
                    reason="Encoder Decoder models not supported on ROCm.")
@pytest.mark.parametrize(("model_id", "is_encoder_decoder"), [
    ("facebook/opt-125m", False),
    ("facebook/bart-base", True),
    ("meta-llama/Llama-3.2-1B-Instruct", False),
    ("meta-llama/Llama-3.2-11B-Vision", True),
])
def test_is_encoder_decoder(model_id, is_encoder_decoder):
    config = ModelConfig(
        model_id,
        task="auto",
        tokenizer=model_id,
        tokenizer_mode="auto",
        trust_remote_code=False,
        dtype="float16",
        seed=0,
    )

    assert config.is_encoder_decoder == is_encoder_decoder


@pytest.mark.parametrize(("model_id", "uses_mrope"), [
    ("facebook/opt-125m", False),
    ("Qwen/Qwen2-VL-2B-Instruct", True),
])
def test_uses_mrope(model_id, uses_mrope):
    config = ModelConfig(
        model_id,
        task="auto",
        tokenizer=model_id,
        tokenizer_mode="auto",
        trust_remote_code=False,
        dtype="float16",
        seed=0,
    )

    assert config.uses_mrope == uses_mrope


def test_generation_config_loading():
    model_id = "Qwen/Qwen2.5-1.5B-Instruct"

    # When set generation_config to "vllm", the default generation config
    # will not be loaded.
    model_config = ModelConfig(model_id,
                               task="auto",
                               tokenizer=model_id,
                               tokenizer_mode="auto",
                               trust_remote_code=False,
                               seed=0,
                               dtype="float16",
                               generation_config="vllm")
    assert model_config.get_diff_sampling_param() == {}

    # When set generation_config to "auto", the default generation config
    # should be loaded.
    model_config = ModelConfig(model_id,
                               task="auto",
                               tokenizer=model_id,
                               tokenizer_mode="auto",
                               trust_remote_code=False,
                               seed=0,
                               dtype="float16",
                               generation_config="auto")

    correct_generation_config = {
        "repetition_penalty": 1.1,
        "temperature": 0.7,
        "top_p": 0.8,
        "top_k": 20,
    }

    assert model_config.get_diff_sampling_param() == correct_generation_config

    # The generation config could be overridden by the user.
    override_generation_config = {"temperature": 0.5, "top_k": 5}

    model_config = ModelConfig(
        model_id,
        task="auto",
        tokenizer=model_id,
        tokenizer_mode="auto",
        trust_remote_code=False,
        seed=0,
        dtype="float16",
        generation_config="auto",
        override_generation_config=override_generation_config)

    override_result = correct_generation_config.copy()
    override_result.update(override_generation_config)

    assert model_config.get_diff_sampling_param() == override_result

    # When generation_config is set to "vllm" and override_generation_config
    # is set, the override_generation_config should be used directly.
    model_config = ModelConfig(
        model_id,
        task="auto",
        tokenizer=model_id,
        tokenizer_mode="auto",
        trust_remote_code=False,
        seed=0,
        dtype="float16",
        generation_config="vllm",
        override_generation_config=override_generation_config)

    assert model_config.get_diff_sampling_param() == override_generation_config


@pytest.mark.parametrize("pt_load_map_location", [
    "cuda",
    {
        "": "cuda"
    },
])
def test_load_config_pt_load_map_location(pt_load_map_location):
    load_config = LoadConfig(pt_load_map_location=pt_load_map_location)
    config = VllmConfig(load_config=load_config)

    assert config.load_config.pt_load_map_location == pt_load_map_location
