"""Shared LangSmith experiment runner."""

from langsmith import Client
from langsmith import evaluate as ls_evaluate

from langsmith_evals.dataset import DATASET_NAME
from langsmith_evals.evaluators import evaluate_formats_tool_called_once

_DEFAULT_EVALUATORS = [evaluate_formats_tool_called_once]


def run(target, prefix: str, evaluators: list | None = None, dataset: str | None = None) -> None:
    """Run a LangSmith experiment against a dataset.

    :param target: Callable ``(inputs: dict) -> dict`` to evaluate.
    :param prefix: Experiment name prefix shown in the LangSmith UI.
    :param evaluators: Evaluator functions. Defaults to result-count + formats-tool-called-once.
    :param dataset: Dataset name. Defaults to the main chord-sequences dataset.
    """
    ls_evaluate(
        target,
        data=dataset or DATASET_NAME,
        evaluators=evaluators or _DEFAULT_EVALUATORS,
        experiment_prefix=prefix,
        client=Client(),
    )