"""DSA model + MTP (EAGLE) speculative-decoding server fixture.

Variants combine `DsaMtpServerBase` (server lifecycle) with
`DsaMtpEvalConfigDefaults` (shared eval thresholds/params),
`GSM8KMixin` and `SpecDecodingMixin`, then set `model` and per-variant
overrides (`enable_dp_attention`, `mem_fraction_static`, `bs_1_speed_thres`).

Example:
    class TestDsv32DP(
        DsaMtpServerBase,
        DsaMtpEvalConfigDefaults,
        GSM8KMixin,
        SpecDecodingMixin,
    ):
        model = "deepseek-ai/DeepSeek-V3.2"
        enable_dp_attention = True
        bs_1_speed_thres = 90

The base itself is NOT a runnable test (no `test_*` methods until a subclass
mixes in the kits), so unittest discovery picks it up as empty.
"""

from sglang.srt.utils import kill_process_tree
from sglang.test.test_utils import (
    DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
    DEFAULT_URL_FOR_TEST,
    CustomTestCase,
    popen_launch_server,
)


class DsaMtpEvalConfigDefaults:
    """Eval thresholds & params shared across DSA-MTP regression variants."""

    # GSM8KMixin defaults.
    gsm8k_accuracy_thres = 0.935
    gsm8k_accept_length_thres = 3.7
    gsm8k_num_questions = 500
    gsm8k_num_threads = 500
    gsm8k_num_shots = 20

    # SpecDecodingMixin default; per-variant subclasses set `bs_1_speed_thres`.
    accept_length_thres = 4.0


class DsaMtpServerBase(CustomTestCase):
    base_url = DEFAULT_URL_FOR_TEST

    # Subclasses must set `model`; the others have sensible defaults.
    model: str = ""
    tp_size: int = 8
    dp_size: int = 8
    mem_fraction_static: float = 0.7
    enable_dp_attention: bool = False
    extra_server_args = ()

    # EAGLE MTP config (fixed across DSA-MTP variants).
    speculative_algorithm: str = "EAGLE"
    speculative_num_steps: int = 5
    speculative_eagle_topk: int = 1
    speculative_num_draft_tokens: int = 6

    @classmethod
    def get_server_args(cls):
        assert cls.model, f"{cls.__name__} must set `model`"
        args = ["--trust-remote-code", "--tp", str(cls.tp_size)]
        if cls.enable_dp_attention:
            args += ["--dp", str(cls.dp_size), "--enable-dp-attention"]
        args += [
            "--speculative-algorithm",
            cls.speculative_algorithm,
            "--speculative-num-steps",
            str(cls.speculative_num_steps),
            "--speculative-eagle-topk",
            str(cls.speculative_eagle_topk),
            "--speculative-num-draft-tokens",
            str(cls.speculative_num_draft_tokens),
            "--mem-frac",
            str(cls.mem_fraction_static),
            "--model-loader-extra-config",
            '{"enable_multithread_load": true, "num_threads": 64}',
        ]
        args += list(cls.extra_server_args)
        return args

    @classmethod
    def setUpClass(cls):
        cls.process = popen_launch_server(
            cls.model,
            cls.base_url,
            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
            other_args=cls.get_server_args(),
        )

    @classmethod
    def tearDownClass(cls):
        if hasattr(cls, "process") and cls.process:
            kill_process_tree(cls.process.pid)
