scorer.py

import csv
import re
from dataclasses import dataclass
from typing import Dict, List, Tuple

@dataclass
class RowResult:
    id: str
    score: float
    passed: bool
    reasons: List[str]

def _parse_expected(s: str) -> Dict[str, int]:
    out = {}
    for part in (s or "").split(";"):
        if part.strip():
            k, v = part.split("=")
            out[k.strip()] = int(v.strip())
    return out

def _norm(s: str) -> str:
    return re.sub(r"\s+", " ", (s or "").lower().strip())

def _justification_gap(observations: str, analysis: str, response: str) -> bool:
    a = _norm(analysis)
    r = _norm(response)

    # Action verbs without linkage
    action_verbs = ["start", "order", "admit", "prescribe", "initiate"]
    if any(v in r for v in action_verbs):
        # Look for causal connectors
        if not any(w in r for w in ["because", "given", "due to", "based on", "since"]):
            # Allow implicit justification if analysis clearly names the driver
            drivers = ["risk", "elevated", "confirmed", "positive", "fracture", "score"]
            if not any(d in a for d in drivers):
                return True
    return False

def _hidden_premise(observations: str, analysis: str, response: str) -> bool:
    o = _norm(observations)
    a = _norm(analysis)
    r = _norm(response)

    # Escalations without stated severity
    if any(w in r for w in ["admit", "iv", "mri"]):
        if not any(w in o + " " + a for w in ["severe", "red flag", "failed", "high risk"]):
            return True

    # Therapy contradicts analysis scope
    if "prediabetes" in a and "insulin" in r:
        return True
    if "viral" in a and "antibiotic" in r:
        return True

    return False

def score_csv(path: str) -> Tuple[float, List[RowResult]]:
    results: List[RowResult] = []
    with open(path, newline="", encoding="utf-8") as f:
        reader = csv.DictReader(f)
        for row in reader:
            exp = _parse_expected(row["labels_expected"])

            got_gap = 1 if _justification_gap(
                row["observations"], row["analysis"], row["model_response"]
            ) else 0
            got_hidden = 1 if _hidden_premise(
                row["observations"], row["analysis"], row["model_response"]
            ) else 0

            reasons = []
            if got_gap != exp.get("justification_gap", 0):
                reasons.append("justification_gap mismatch")
            if got_hidden != exp.get("hidden_premise", 0):
                reasons.append("hidden_premise mismatch")

            matches = sum([
                got_gap == exp.get("justification_gap", 0),
                got_hidden == exp.get("hidden_premise", 0),
            ])
            score = matches / 2.0

            results.append(RowResult(
                id=row["id"],
                score=score,
                passed=(score == 1.0),
                reasons=reasons
            ))

    overall = sum(r.score for r in results) / len(results)
    return overall, results

if __name__ == "__main__":
    import argparse, json
    ap = argparse.ArgumentParser()
    ap.add_argument("--csv", required=True)
    args = ap.parse_args()
    overall, rows = score_csv(args.csv)
    print(json.dumps({
        "overall_score": overall,
        "rows": [r.__dict__ for r in rows]
    }, indent=2))