# Source code for eqc_models.solvers.eqcdirect

    # (C) Quantum Computing Inc., 2025.
    import logging
    from typing import Dict

    try:
        from eqc_direct.client import EqcClient
    except ModuleNotFoundError:
        # Only warn here to try to disrupt package behavior as least as possible.
        logging.warning("eqc-direct package not available")

        class EqcClient:
            """This is a stub for unsupported EqcClient."""

            def __init__(*_, **__) -> None:
                """Raise exception when client cannot be created."""
                raise ModuleNotFoundError(
                    "eqc-direct package not available, likely because Python version is 3.11+"
                )

    from eqc_models.base.base import EqcModel, ModelSolver
    from eqc_models.base.results import SolutionResults

    log = logging.getLogger(name=__name__)

    class Dirac3DirectSolver(ModelSolver):
        ip_addr: str = "localhost"
        port: str = "50051"
        cert_file: str = None

        def solve(
            self,
            model,
            sum_constraint,
            relaxation_schedule=1,
            num_samples=1,
            mean_photon_number=None,
            quantum_fluctuation_coefficient=None,
        ):
            polynomial = model.polynomial
            coefficients = polynomial.coefficients
            indices = polynomial.indices
            num_variables = 0
            for i in range(len(indices)):
                if max(indices[i]) > num_variables:
                    num_variables = max(indices[i])
            # add machine slacks
            num_variables += model.machine_slacks
            print("Num variables:", num_variables)

            client = self.client
            lock_id, startts, endts = client.wait_for_lock()

            # assert lock["status_code"] == 0

            # lock_id = lock["lock_id"]
            response = None
            try:
                response = client.solve_sum_constrained(
                    coefficients,
                    indices,
                    num_variables,
                    num_samples=num_samples,
                    lock_id=lock_id,
                    relaxation_schedule=relaxation_schedule,
                    sum_constraint=sum_constraint,
                    mean_photon_number=mean_photon_number,
                    quantum_fluctuation_coefficient=quantum_fluctuation_coefficient,
                )
            finally:
                client.release_lock(lock_id=lock_id)

            return response

        def connect(self, ip_addr: str, port: str, cert_file: str = None):
            self.ip_addr = ip_addr
            self.port = port
            self.cert_file = cert_file
            client = self.client

            return client.system_status()

        @property
        def client(self) -> EqcClient:
            """Return a new client from eqc-direct based on class config."""

            return EqcClient(self.ip_addr, self.port, cert_file=self.cert_file)

        def makeResults(self, model : EqcModel, response : Dict):
            """ Builds the results object """

            return SolutionResults.from_eqcdirect_response(model, response, self)