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"""Load versioned paper Judge tasks and keep result scopes explicit."""

import hashlib
import json
from pathlib import Path


J1_PROFILES = {"full": "judge.j1.strategy_appropriateness", "paper-filtered": "judge.j1.paper_filtered_261"}
JUDGE_TYPES = {"j1": "J1_strategy_appropriateness", "j2": "J2_strategy_identification"}


def load_judge_dataset(data_dir, task, j1_profile="full"):
    if task not in JUDGE_TYPES or j1_profile not in J1_PROFILES:
        raise ValueError("Choose paper j1/j2 and an explicit J1 profile")
    root = Path(data_dir)
    manifest = json.loads((root / "manifest.json").read_bytes())
    key = J1_PROFILES[j1_profile] if task == "j1" else "judge.j2.strategy_identification"
    catalog = manifest["subsets"] if task == "j1" and j1_profile == "paper-filtered" else manifest["tasks"]
    entry = catalog[key]
    if entry["task_type"] != JUDGE_TYPES[task]:
        raise ValueError("Manifest task identity does not match the paper task")
    path = (root / entry["path"]).resolve()
    if root.resolve() not in path.parents:
        raise ValueError("Dataset path escapes the data directory")
    raw = path.read_bytes()
    if hashlib.sha256(raw).hexdigest() != entry["sha256"]:
        raise ValueError("Dataset hash differs from the release manifest")
    items = json.loads(raw)
    if len(items) != entry["record_count"] or len({x["task_id"] for x in items}) != len(items):
        raise ValueError("Dataset count or unique IDs do not match the release")
    labels = {"YES", "NO"} if task == "j1" else {"SHORTCUT", "COMPUTATION"}
    for item in items:
        if item["task_type"] != JUDGE_TYPES[task] or (item["ground_truth"] not in labels and not (item["ground_truth"] is None and item.get("label_source") == "pending")):
            raise ValueError("Dataset task type or answer vocabulary mismatch")
        if not isinstance(item.get("prompt"), str) or not item["prompt"]:
            raise ValueError("Missing Judge prompt")
        if task == "j2" and not isinstance(item.get("solution"), str):
            raise ValueError("Strategy identification requires the supplied solution")
    metadata = {"release_id": manifest["release_id"], "task_key": key,
                "sha256": entry["sha256"], "expected_items": len(items),
                "j1_profile": j1_profile if task == "j1" else None}
    return items, metadata


def validate_existing_results(records, items, metadata):
    """Refuse silent reuse across different tasks, prompts, labels or subsets."""
    lookup = {item["task_id"]: item for item in items}
    seen = set()
    for record in records:
        identifier = record["task_id"]
        if identifier in seen or identifier not in lookup:
            raise ValueError("Duplicate or out-of-scope result ID")
        seen.add(identifier)
        item = lookup[identifier]
        if record.get("dataset") != metadata:
            raise ValueError("Result dataset provenance differs; do not mix historical runs")
        if any(record.get(k) != item[k] for k in ("task_type", "prompt", "ground_truth")):
            raise ValueError("Result prompt or reference does not match the selected dataset")