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#!/usr/bin/env python3
"""Score predictions on VeriSpoof-Bench (numpy, pandas, pyarrow; no model code).

    python scripts/score.py --pred <pred_dir> [--bench <local dataset dir | AustinXiao/VeriSpoof-Bench>]
                            [--subsets ...] [--out metrics.json]

<pred_dir> holds one file per subset, <subset>.parquet | .jsonl | .csv, with an `item_id` column and:

  authenticity, same_*, generator_id, acoustic_model, recording_condition
      scores        list of candidate scores aligned with the item's `options` (e.g. log-likelihoods), or
      score         one number per item: authenticity -> higher = spoof; same_* -> higher = same
                    (closed questions need `scores`)
  ad_reasoning (grounded detection reasoning)
      output        the model's reasoning text (OBSERVATIONS / CHANNEL_STATUS / LOCALIZATION / SOURCE_PROFILE /
                    DECISION lines; see the dataset card)
      loc_score     optional: log p(" No synthesized segment is found.") after the model's own "LOCALIZATION:"
      flip_scores   optional: [logp bona fide, logp spoof] decision candidates after the opposite localization
      token_scores  optional: per-token synthesized scores on the 0.16 s grid (> 0 = synthesized), as
                    `ref_token_labels`
    plus, optionally, <subset>.faith.(parquet|jsonl|csv) with item_id, form, decision ("bonafide" / "spoof"), the
    model's decision after each faithfulness intervention (scripts/faithfulness.py makes the prompts)
  sv_reasoning (source-verification reasoning)
      output          the model's reasoning text
      decision_score  optional: higher = same generation system (verdict EER; without it the parsed verdict is used)

Writes {subset: metrics} as JSON and prints a summary line per subset.
"""
import argparse
import json
import os
import sys

import numpy as np
import pandas as pd

sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
import vsbench_metrics as VM  # noqa: E402

HERE = os.path.dirname(os.path.abspath(__file__))
DIRECT = {"authenticity", "same_generator", "same_acoustic_model", "same_vocoder", "generator_id", "acoustic_model",
          "recording_condition"}
HEADLINE = {"authenticity": "eer", "same_generator": "eer", "same_acoustic_model": "eer", "same_vocoder": "eer",
            "generator_id": "acc", "acoustic_model": "acc", "recording_condition": "acc",
            "ad_reasoning": "decision_acc", "sv_reasoning": "eer_decision"}


def bench_dir(b):
    if b and os.path.isdir(b):
        return b
    from huggingface_hub import snapshot_download
    return snapshot_download(b or "AustinXiao/VeriSpoof-Bench", repo_type="dataset", allow_patterns=["data/*"])


def read_table(path_noext):
    for ext, f in ((".parquet", pd.read_parquet), (".jsonl", lambda p: pd.read_json(p, lines=True)),
                   (".csv", pd.read_csv)):
        if os.path.exists(path_noext + ext):
            d = f(path_noext + ext)
            for c in ("scores", "flip_scores", "token_scores"):
                if c in d.columns and d[c].dtype == object and len(d) and isinstance(d[c].iloc[0], str):
                    d[c] = d[c].map(json.loads)
            return d
    return None


def load_items(bench, subset):
    import pyarrow.parquet as pq
    items = []
    for r in pq.read_table(f"{bench}/data/{subset}.parquet").to_pylist():
        items.append({"item_id": r["item_id"], "task": r["task"], "options": r["options"],
                      "label_index": r["label_index"], "label": r["label"],
                      "meta": json.loads(r["meta"]) if r["meta"] else {},
                      "labels": json.loads(r["labels"]) if r["labels"] else {},
                      "reference": r["reference"], "ref_label": r["label"], "ref_kind": r["ref_kind"],
                      "ref_spans": r["ref_spans"] or [], "ref_token_labels": r["ref_token_labels"],
                      "has_proc": r["audio"][0]["post_processing"] is not None})
    return items


def align(items, pred, subset):
    p = pred.set_index("item_id")
    missing = [it["item_id"] for it in items if it["item_id"] not in p.index]
    if missing:
        raise SystemExit(f"{subset}: {len(missing)} items without a prediction, e.g. {missing[:3]}")
    return p.loc[[it["item_id"] for it in items]]


def score_subset(items, pred, faith=None, subset=""):
    task = items[0]["task"]
    p = align(items, pred, subset)
    if task in DIRECT:
        if "scores" in p.columns and p["scores"].notna().all():
            K = max(len(it["options"]) for it in items)
            S = np.full((len(items), K), -np.inf)
            for i, s in enumerate(p["scores"]):
                S[i, :len(s)] = s
        elif "score" in p.columns:
            S = p["score"].to_numpy(float)
        else:
            raise SystemExit(f"{subset}: needs `scores` or `score`")
        return VM.direct_metrics(items, S)
    if task == "ad_reasoning":
        opt = lambda c: list(p[c]) if c in p.columns and p[c].notna().all() else None  # noqa: E731
        m = VM.ad_metrics(items, list(p["output"].fillna("")), opt("loc_score"), opt("flip_scores"),
                          opt("token_scores"))
        for form in ("paraphrase", "span", "channel", "observe"):  # items each held-out intervention applies to
            m[f"faith_{form}_n"] = sum(VM.intervene(t, form) is not None for t in p["output"].fillna(""))
        if faith is not None:
            texts = dict(zip(p.index, p["output"].fillna("")))
            for form, g in faith.groupby("form"):
                exp, dec = [], []
                for iid, d in zip(g["item_id"], g["decision"]):
                    r = VM.intervene(texts[iid], form)
                    if r is not None:
                        exp.append(r[1])
                        dec.append(d)
                m[f"faith_{form}"] = round(VM.faith_rate(exp, dec), 4) if exp else None
                m[f"faith_{form}_n"] = len(exp)
        return m
    if task == "sv_reasoning":
        ds = list(p["decision_score"]) if "decision_score" in p.columns and p["decision_score"].notna().all() else None
        m = VM.sv_metrics(items, list(p["output"].fillna("")), ds)
        if "branch_score" in p.columns and p["branch_score"].notna().all():  # VeriSpoof's decision at the connector
            m["eer_branch"] = round(VM.eer(p["branch_score"].to_numpy(float),
                                           [it["labels"]["same_generator"] for it in items]), 4)
        return m
    raise SystemExit(f"unknown task {task}")


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--pred", required=True)
    ap.add_argument("--bench", default=os.path.join(HERE, ".."))
    ap.add_argument("--subsets", nargs="*")
    ap.add_argument("--out")
    a = ap.parse_args()
    bench = bench_dir(a.bench)
    subsets = a.subsets or sorted(f[:-8] for f in os.listdir(f"{bench}/data") if f.endswith(".parquet"))
    res = {}
    for s in subsets:
        pred = read_table(f"{a.pred}/{s}")
        if pred is None:
            continue
        items = load_items(bench, s)
        res[s] = score_subset(items, pred, read_table(f"{a.pred}/{s}.faith"), s)
        h = HEADLINE[items[0]["task"]]
        print(f"{s:<55} {h} {res[s].get(h)}", flush=True)
    if a.out:
        json.dump(res, open(a.out, "w"), indent=1)
    if not res:
        print("no prediction files found in", a.pred)


if __name__ == "__main__":
    main()