# /// script
# requires-python = ">=3.10"
# dependencies = [
#     "datasets>=2.19",
#     "huggingface-hub>=0.23",
#     "httpx>=0.27",
#     "tqdm>=4.66",
# ]
# ///
"""
Evaluation script for the Humatheque IdRef-Qualinka alignment API.

It runs the deployed `/align/person` endpoint over the
`Geraldine/humatheque-vlm-sudoc-grounded-idref` dataset (used as an evaluation
set with golden {name -> PPN} pairs) and reports alignment accuracy.

For each row:
  1. Build the document context from `sudoc_record_templated`
     (title, subtitle, discipline, institution, doctoral_school, degree_type, year).
  2. For each golden {name: ppn} in `idref_persname_ppns`, POST to /align/person
     with the name + context.
  3. Compare the predicted PPN against the golden PPN.

Metrics reported:
  - accepted_correct : status == "accepted" AND best_ppn == gold      (production decision is right)
  - accepted_total   : status == "accepted" (regardless of correctness)
  - top1_correct     : best_candidate.ppn == gold                     (ranking quality, ignoring threshold)
  - topk_correct     : gold appears anywhere in the ranked candidates  (recall of the candidate search)
  - precision/recall/F1 of the "accepted" decision, plus status breakdown.

Run:
  uv run eval_idref_alignment.py
  uv run eval_idref_alignment.py --limit 10 --concurrency 4 --out results.jsonl
  IDREF_API_KEY=xxx uv run eval_idref_alignment.py            # if the API requires a key

Usage examples are listed via --help.
"""
from __future__ import annotations

import argparse
import asyncio
import json
import os
import sys
from collections import Counter
from dataclasses import dataclass, field, asdict
from typing import Any

import httpx
from datasets import load_dataset
from tqdm import tqdm

# --------------------------------------------------------------------------- #
# Configuration / CLI
# --------------------------------------------------------------------------- #
DEFAULT_API = "https://idref-linker.smartbiblia.fr"
DEFAULT_DATASET = "Geraldine/humatheque-vlm-sudoc-grounded-idref"
DEFAULT_EMBEDDING_MODEL = "sentence-transformers/paraphrase-multilingual-MiniLM-L12-v2"


def parse_args() -> argparse.Namespace:
    p = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
    p.add_argument("--api-base", default=os.getenv("IDREF_API_BASE", DEFAULT_API),
                   help=f"Base URL of the alignment API (default: {DEFAULT_API})")
    p.add_argument("--dataset", default=DEFAULT_DATASET, help="HF dataset id used for evaluation")
    p.add_argument("--split", default="train", help="Dataset split (default: train)")
    p.add_argument("--api-key", default=os.getenv("IDREF_API_KEY", ""),
                   help="X-API-Key header value (or set IDREF_API_KEY). Empty if the API is open.")
    p.add_argument("--embedding-model", default=DEFAULT_EMBEDDING_MODEL,
                   help="Embedding model passed to the API (empty string => lexical similarity).")
    p.add_argument("--max-candidates", type=int, default=20)
    p.add_argument("--max-docs-per-role", type=int, default=20)
    p.add_argument("--reference-top-k", type=int, default=3)
    p.add_argument("--limit", type=int, default=0, help="Evaluate only the first N rows (0 = all).")
    p.add_argument("--concurrency", type=int, default=4, help="Max concurrent API requests.")
    p.add_argument("--request-timeout", type=float, default=90.0, help="Per-request HTTP timeout (s).")
    p.add_argument("--out", default="idref_eval_results.jsonl", help="Per-person JSONL output path.")
    p.add_argument("--summary-out", default="idref_eval_summary.json", help="Summary JSON output path.")
    return p.parse_args()


# --------------------------------------------------------------------------- #
# Context extraction + payload building
# --------------------------------------------------------------------------- #
def build_context(templated: str | dict[str, Any] | None) -> dict[str, Any]:
    """Parse `sudoc_record_templated` (JSON string or dict) into the document context."""
    extraction: dict[str, Any]
    if isinstance(templated, dict):
        extraction = templated
    elif isinstance(templated, str) and templated.strip():
        try:
            extraction = json.loads(templated)
        except json.JSONDecodeError:
            extraction = {}
    else:
        extraction = {}
    return extraction


def build_align_payload(extraction: dict[str, Any], name: str, embedding_model: str,
                        max_candidates: int, max_docs_per_role: int, reference_top_k: int) -> dict[str, Any]:
    """Mirror the API's expected AlignPersonRequest body (see provided reference)."""
    return {
        "name": name,
        "title": str(extraction.get("title") or ""),
        "subtitle": str(extraction.get("subtitle") or ""),
        "discipline": str(extraction.get("discipline") or ""),
        "institution": str(extraction.get("granting_institution") or ""),
        "doctoral_school": str(extraction.get("doctoral_school") or ""),
        "degree_type": str(extraction.get("degree_type") or ""),
        "year": str(extraction.get("defense_year") or ""),
        "max_candidates": max_candidates,
        "max_docs_per_role": max_docs_per_role,
        "reference_top_k": reference_top_k,
        "embedding_model": embedding_model,
    }


def parse_idref_column(raw: Any) -> dict[str, str]:
    """`idref_persname_ppns` is stored as a JSON string like '[{"Name": "ppn", ...}]'.

    Return a flat {name: ppn} mapping.
    """
    if raw is None:
        return {}
    obj = raw
    if isinstance(raw, str):
        try:
            obj = json.loads(raw)
        except json.JSONDecodeError:
            return {}
    merged: dict[str, str] = {}
    if isinstance(obj, list):
        for d in obj:
            if isinstance(d, dict):
                for k, v in d.items():
                    merged[str(k)] = str(v)
    elif isinstance(obj, dict):
        for k, v in obj.items():
            merged[str(k)] = str(v)
    return merged


# --------------------------------------------------------------------------- #
# Per-person evaluation record
# --------------------------------------------------------------------------- #
@dataclass
class PersonEval:
    row_index: int
    case_id: str
    base_id: str
    name: str
    gold_ppn: str
    status: str = "error"
    best_ppn: str | None = None            # API decision (only set when status == accepted)
    top1_ppn: str | None = None            # top-ranked candidate, regardless of threshold
    top1_score: float | None = None
    candidate_ppns: list[str] = field(default_factory=list)
    gold_rank: int | None = None           # 1-based position of gold in ranked candidates, else None
    accepted_correct: bool = False
    top1_correct: bool = False
    topk_correct: bool = False
    error: str | None = None


def evaluate_response(rec: PersonEval, resp: dict[str, Any]) -> PersonEval:
    rec.status = str(resp.get("status") or "unknown")
    rec.best_ppn = resp.get("best_ppn")
    best_cand = resp.get("best_candidate") or {}
    rec.top1_ppn = best_cand.get("ppn")
    rec.top1_score = (best_cand.get("score") or {}).get("final")
    cands = resp.get("candidates") or []
    rec.candidate_ppns = [c.get("ppn") for c in cands if isinstance(c, dict)]
    if rec.gold_ppn in rec.candidate_ppns:
        rec.gold_rank = rec.candidate_ppns.index(rec.gold_ppn) + 1
    rec.accepted_correct = (rec.status == "accepted" and rec.best_ppn == rec.gold_ppn)
    rec.top1_correct = (rec.top1_ppn == rec.gold_ppn)
    rec.topk_correct = (rec.gold_ppn in rec.candidate_ppns)
    return rec


# --------------------------------------------------------------------------- #
# Async runner
# --------------------------------------------------------------------------- #
async def call_align(client: httpx.AsyncClient, url: str, headers: dict[str, str],
                     payload: dict[str, Any], retries: int = 2) -> dict[str, Any]:
    last_err = ""
    for attempt in range(retries + 1):
        try:
            r = await client.post(url, json=payload, headers=headers)
            if r.status_code == 200:
                return r.json()
            last_err = f"HTTP {r.status_code}: {r.text[:200]}"
        except Exception as exc:  # noqa: BLE001
            last_err = f"{type(exc).__name__}: {exc}"
        await asyncio.sleep(1.5 * (attempt + 1))
    raise RuntimeError(last_err or "unknown error")


async def run_eval(args: argparse.Namespace) -> None:
    print(f"Loading dataset {args.dataset} (split={args.split}) ...", file=sys.stderr)
    ds = load_dataset(args.dataset, split=args.split)
    # We never need the decoded image; drop it to avoid Pillow dependency.
    if "thumbnail" in ds.column_names:
        ds = ds.remove_columns(["thumbnail"])

    n_rows = len(ds) if args.limit <= 0 else min(args.limit, len(ds))

    # Build the flat list of (row, person) tasks.
    tasks_meta: list[PersonEval] = []
    payloads: list[dict[str, Any]] = []
    for i in range(n_rows):
        row = ds[i]
        ctx = build_context(row.get("sudoc_record_templated"))
        gold = parse_idref_column(row.get("idref_persname_ppns"))
        for name, ppn in gold.items():
            tasks_meta.append(PersonEval(
                row_index=i,
                case_id=str(row.get("case_id") or ""),
                base_id=str(row.get("base_id") or ""),
                name=name,
                gold_ppn=str(ppn),
            ))
            payloads.append(build_align_payload(
                ctx, name, args.embedding_model,
                args.max_candidates, args.max_docs_per_role, args.reference_top_k,
            ))

    print(f"{n_rows} documents -> {len(tasks_meta)} person alignment requests.", file=sys.stderr)

    url = args.api_base.rstrip("/") + "/align/person"
    headers = {"Content-Type": "application/json"}
    if args.api_key:
        headers["X-API-Key"] = args.api_key

    sem = asyncio.Semaphore(args.concurrency)
    limits = httpx.Limits(max_connections=args.concurrency, max_keepalive_connections=args.concurrency)
    timeout = httpx.Timeout(args.request_timeout)

    results: list[PersonEval] = [None] * len(tasks_meta)  # type: ignore[list-item]

    async with httpx.AsyncClient(limits=limits, timeout=timeout, follow_redirects=True) as client:
        pbar = tqdm(total=len(tasks_meta), desc="aligning", file=sys.stderr)

        async def worker(idx: int) -> None:
            rec = tasks_meta[idx]
            async with sem:
                try:
                    resp = await call_align(client, url, headers, payloads[idx])
                    rec = evaluate_response(rec, resp)
                except Exception as exc:  # noqa: BLE001
                    rec.error = str(exc)
                    rec.status = "error"
            results[idx] = rec
            pbar.update(1)

        await asyncio.gather(*(worker(i) for i in range(len(tasks_meta))))
        pbar.close()

    # ----------------------------------------------------------------------- #
    # Write per-person JSONL
    # ----------------------------------------------------------------------- #
    with open(args.out, "w", encoding="utf-8") as fh:
        for rec in results:
            fh.write(json.dumps(asdict(rec), ensure_ascii=False) + "\n")

    # ----------------------------------------------------------------------- #
    # Aggregate metrics
    # ----------------------------------------------------------------------- #
    total = len(results)
    errors = sum(1 for r in results if r.error)
    evaluated = total - errors
    accepted = sum(1 for r in results if r.status == "accepted")
    accepted_correct = sum(1 for r in results if r.accepted_correct)
    top1_correct = sum(1 for r in results if r.top1_correct)
    topk_correct = sum(1 for r in results if r.topk_correct)
    status_breakdown = Counter(r.status for r in results)

    def pct(num: int, den: int) -> float:
        return round(100.0 * num / den, 2) if den else 0.0

    # Treat "accepted" as the positive prediction; gold is always a real positive (every person has a true PPN).
    # precision = accepted_correct / accepted ; recall = accepted_correct / evaluated
    precision = pct(accepted_correct, accepted)
    recall = pct(accepted_correct, evaluated)
    f1 = round(2 * precision * recall / (precision + recall), 2) if (precision + recall) else 0.0

    summary = {
        "dataset": args.dataset,
        "split": args.split,
        "api_base": args.api_base,
        "embedding_model": args.embedding_model,
        "documents_evaluated": n_rows,
        "person_requests_total": total,
        "request_errors": errors,
        "evaluated": evaluated,
        "metrics": {
            "accepted_decisions": accepted,
            "accepted_correct": accepted_correct,
            "accepted_accuracy_over_evaluated_pct": pct(accepted_correct, evaluated),
            "top1_correct": top1_correct,
            "top1_accuracy_pct": pct(top1_correct, evaluated),
            "topk_correct_(gold_in_candidates)": topk_correct,
            "candidate_recall_pct": pct(topk_correct, evaluated),
            "accepted_precision_pct": precision,
            "accepted_recall_pct": recall,
            "accepted_f1": f1,
        },
        "status_breakdown": dict(status_breakdown),
    }

    with open(args.summary_out, "w", encoding="utf-8") as fh:
        json.dump(summary, fh, ensure_ascii=False, indent=2)

    # ----------------------------------------------------------------------- #
    # Console report
    # ----------------------------------------------------------------------- #
    print("\n" + "=" * 70)
    print("IdRef alignment evaluation — summary")
    print("=" * 70)
    print(f"Dataset            : {args.dataset} [{args.split}]")
    print(f"API                : {args.api_base}  (embedding={args.embedding_model or 'lexical'})")
    print(f"Documents          : {n_rows}")
    print(f"Person requests    : {total}  (errors: {errors}, evaluated: {evaluated})")
    print("-" * 70)
    m = summary["metrics"]
    print(f"Accepted decisions : {accepted}/{evaluated} ({pct(accepted, evaluated)}%)")
    print(f"Accepted & correct : {accepted_correct}/{evaluated} ({m['accepted_accuracy_over_evaluated_pct']}%)")
    print(f"Top-1 correct      : {top1_correct}/{evaluated} ({m['top1_accuracy_pct']}%)")
    print(f"Gold in candidates : {topk_correct}/{evaluated} ({m['candidate_recall_pct']}%)  <- candidate recall")
    print("-" * 70)
    print(f"Accepted precision : {precision}%   (correct / accepted)")
    print(f"Accepted recall    : {recall}%   (correct / evaluated)")
    print(f"Accepted F1        : {f1}")
    print("-" * 70)
    print("Status breakdown   :")
    for st, c in status_breakdown.most_common():
        print(f"   {st:<15}: {c}")
    print("=" * 70)
    print(f"Per-person details : {args.out}")
    print(f"Summary JSON       : {args.summary_out}")


def main() -> None:
    args = parse_args()
    asyncio.run(run_eval(args))


if __name__ == "__main__":
    main()