from dataclasses import dataclass
from typing import Dict, Any, List
import re

@dataclass
class ScoreResult:
    score: float
    details: Dict[str, Any]

# Expect the model to output these fields in text
REQ = ["interface_coherence_score", "baseline_failure_margin", "signal_paths"]

_float_re = re.compile(r"(interface_coherence_score|baseline_failure_margin)\s*[:=]\s*(0(\.\d+)?|1(\.0+)?)", re.I)

def _has_paths(text: str) -> bool:
    # Accept either "A:..|B:.." style or "A:..>..|B:..>.." style
    t = text.replace(" ", "")
    return ("A:" in t and "B:" in t and ">" in t) or ("signal_paths" in t and ">" in t)

def score(sample: Dict[str, Any], prediction: str) -> ScoreResult:
    p = (prediction or "").strip()
    pl = p.lower()
    words_ok = len(p.split()) <= 900

    field_words = sum(1 for k in REQ if k in pl)
    float_hits = len(_float_re.findall(p))
    has_paths = _has_paths(p)

    raw = (
        0.25 * int(words_ok) +
        0.35 * min(1.0, field_words / len(REQ)) +
        0.30 * min(1.0, float_hits / 2) +
        0.10 * int(has_paths)
    )
    return ScoreResult(score=min(1.0, raw), details={"id": sample.get("id"), "field_word_hits": field_words})

def aggregate(results: List[ScoreResult]) -> Dict[str, Any]:
    if not results:
        return {"mean": 0.0, "n": 0}
    return {"mean": sum(r.score for r in results) / len(results), "n": len(results)}