import unittest
from types import SimpleNamespace

from sglang.test.few_shot_gsm8k import run_eval as run_eval_few_shot_gsm8k
from sglang.test.server_fixtures.disaggregation_fixture import (
    PDDisaggregationServerBase,
)
from sglang.test.test_utils import (
    DEFAULT_MODEL_NAME_FOR_TEST,
    DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
    popen_launch_pd_server,
)


class TestDisaggregationPiecewiseCudaGraph(PDDisaggregationServerBase):
    """Test piecewise CUDA graph support in disaggregation prefill server"""

    @classmethod
    def setUpClass(cls):
        super().setUpClass()
        cls.model = DEFAULT_MODEL_NAME_FOR_TEST

        # Start servers
        cls.start_prefill()
        cls.start_decode()

        # Wait for both to be ready
        cls.wait_server_ready(cls.prefill_url + "/health", process=cls.process_prefill)
        cls.wait_server_ready(cls.decode_url + "/health", process=cls.process_decode)

        cls.launch_lb()

    @classmethod
    def start_prefill(cls):
        prefill_args = [
            "--trust-remote-code",
            "--disaggregation-mode",
            "prefill",
            "--tp",
            "1",
            "--enforce-piecewise-cuda-graph",
        ]
        prefill_args += cls.transfer_backend + cls.rdma_devices
        cls.process_prefill = popen_launch_pd_server(
            cls.model,
            cls.prefill_url,
            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
            other_args=prefill_args,
        )

    @classmethod
    def start_decode(cls):
        decode_args = [
            "--trust-remote-code",
            "--disaggregation-mode",
            "decode",
            "--tp",
            "1",
            "--base-gpu-id",
            "1",
        ]
        decode_args += cls.transfer_backend + cls.rdma_devices
        cls.process_decode = popen_launch_pd_server(
            cls.model,
            cls.decode_url,
            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
            other_args=decode_args,
        )

    def test_gsm8k_accuracy(self):
        """Verify that piecewise cuda graph works correctly in prefill server"""
        args = SimpleNamespace(
            num_shots=5,
            data_path=None,
            num_questions=200,
            max_new_tokens=512,
            parallel=128,
            host=f"http://{self.base_host}",
            port=int(self.lb_port),
        )
        metrics = run_eval_few_shot_gsm8k(args)
        print(f"GSM8K accuracy with piecewise cuda graph: {metrics['accuracy']:.3f}")

        self.assertGreater(metrics["accuracy"], 0.62)


if __name__ == "__main__":
    unittest.main()
