"""Task catalog.

Two tiers, and the distinction is not cosmetic:

REFERENCE -- public benchmarks pulled from inspect_evals. These are NOT here to
  rank models. They exist to (a) prove the harness is wired correctly, (b) give
  a calibration anchor -- if our number lands far from published values, the
  harness is broken, not the model, and (c) let an outside reader locate this
  bench against numbers they already know. A bench made only of private tasks
  is unfalsifiable to everyone including its author. Reference scores are
  displayed with a caveat: public, likely contaminated, calibration only.

SIGNAL -- our own private tasks, derived from real workloads. This is the
  actual product. These never become public: the moment they do they enter the
  next training corpus and stop measuring anything. See docs/DECISIONS.md#d3.
"""

from __future__ import annotations

from dataclasses import dataclass


@dataclass(frozen=True)
class TaskSpec:
    """One benchmark task and how to read its numbers."""

    name: str
    inspect_task: str
    tier: str  # "reference" | "signal" | "canary" | "example"
    # Which key in the scorer's metrics is the headline accuracy.
    primary_metric: str
    # Sample scores may be dict-valued (IFEval) rather than scalar. If so, this
    # names the key that decides pass/fail for a single sample.
    primary_sample_key: str | None = None
    dataset_samples: int | None = None
    judge_required: bool = False
    # NLTK corpora the scorer needs. Checked (and fetched) before the eval
    # starts: IFEval's scorer needs punkt_tab but only touches it at scoring
    # time, so a missing corpus kills the run ~20 minutes of GPU time in.
    # Preflight turns that into a two-second failure.
    nltk_resources: tuple[str, ...] = ()
    notes: str = ""


CATALOG: dict[str, TaskSpec] = {
    "ifeval": TaskSpec(
        name="ifeval",
        inspect_task="inspect_evals/ifeval",
        tier="reference",
        primary_metric="final_acc",
        primary_sample_key="prompt_level_strict",
        dataset_samples=541,
        judge_required=False,
        nltk_resources=("tokenizers/punkt_tab",),
        notes=(
            "Verifiable instruction following -- 'write exactly 3 paragraphs', "
            "'do not use the letter e'. Chosen as the first reference eval "
            "because its scorer is deterministic (no judge model, no cost, no "
            "judge drift between runs) and because instruction adherence is "
            "the property that actually decides whether a small local model "
            "can hold a system prompt in production."
        ),
    ),
    "agent_ops": TaskSpec(
        name="agent_ops",
        inspect_task="kbench/tasks/signal.py@agent_ops",
        tier="signal",
        primary_metric="accuracy",
        dataset_samples=12,
        # One rubric sample in twelve, so a judge is needed but the drift it
        # introduces is bounded to a twelfth of the score.
        judge_required=True,
        notes=(
            "Operating a Lumbridge Compute node: admission arithmetic against "
            "both the declared budget and the observed pool, watchdog policy, "
            "why a Scene naming ids rather than commands cannot introduce "
            "code, transactional rollback, and process identity under PID "
            "reuse. Derived from the decisions the MCP server exists to let an "
            "agent make, which is what makes it unfakeable by a general "
            "benchmark -- nobody else measures competence at running this."
        ),
    ),
    "contamination": TaskSpec(
        name="contamination",
        inspect_task="kbench/tasks/canary.py@contamination",
        # Its own tier because its score is an alarm, not a capability, and
        # compute_verdict() reads it to decide whether the signal score is
        # usable at all. Registering it is load-bearing: an unregistered probe
        # never runs, so the gate reports "unverified" forever -- which is the
        # same shape of bug as the canary that was never embedded in a prompt.
        tier="canary",
        primary_metric="accuracy",
        dataset_samples=3,
        judge_required=False,
        notes=(
            "Contamination probe. One carrier puts the GUID into the inference "
            "traffic; two detectors ask for it cold. Scoring is inverted -- 0 "
            "is the healthy result, and anything above 0 voids every quality "
            "number for the target. See data/README.md."
        ),
    ),
    "example": TaskSpec(
        name="example",
        inspect_task="kbench/tasks/signal.py@example",
        # Tier "example" deliberately: it exercises the signal machinery but
        # measures nothing, so it must not contribute to the signal score in
        # compute_verdict(). Real families are registered with tier="signal".
        tier="example",
        primary_metric="accuracy",
        dataset_samples=4,
        judge_required=True,
        notes=(
            "Public demonstration of the signal-task format -- one sample per "
            "scorer type. Lives in data/public/. Real signal families live in "
            "data/private/ and never ship."
        ),
    ),
}


def get(name: str) -> TaskSpec:
    if name not in CATALOG:
        known = ", ".join(sorted(CATALOG))
        raise KeyError(f"unknown task {name!r}. known tasks: {known}")
    return CATALOG[name]


def by_tier(tier: str) -> list[TaskSpec]:
    return [t for t in CATALOG.values() if t.tier == tier]


__all__ = ["CATALOG", "TaskSpec", "by_tier", "get"]