#!/usr/bin/env python3
"""Scores predictions on askmdb-test by execution (load the databases first with tools/gen.py).

Predictions: JSONL, one object per case, {"id": "...", "raw": "<model output>"}, where raw is the
model's text cut after the top-level '}' (or null if there was none). Optional "level": the askmdb
verifier's "read" | "warn" | "blocked"; "blocked" counts as wrong (the published scores used it).

    python3 tools/score.py --uri mongodb://localhost:27017 predictions.jsonl
    python3 tools/score.py --uri mongodb://localhost:27017 --self-check   # references as predictions

--self-check scores the references themselves (refuse/unsure cases as those types): it must give
500/500, which proves the databases and the comparator are set up as in the published scores.
Requires pymongo (tested with pymongo 4.19 and MongoDB 8.0).
"""

import argparse
import json
import math
import sys
from collections import Counter
from pathlib import Path

HERE = Path(__file__).resolve().parent
sys.path.insert(0, str(HERE))

import compare  # noqa: E402
import contract  # noqa: E402

TEST = HERE.parent / "test.jsonl"


def wilson(k, n, z=1.959964):
    if n == 0:
        return 0.0, 0.0
    p = k / n
    d = 1 + z * z / n
    c = (p + z * z / (2 * n)) / d
    h = z * math.sqrt(p * (1 - p) / n + z * z / (4 * n * n)) / d
    return 100 * (c - h), 100 * (c + h)


def reference_raw(case):
    if case["expected_type"] != "query":
        return json.dumps({"type": case["expected_type"], "collection": "", "pipeline": [],
                           "explanation": "reference"}, separators=(",", ":"))
    ref = case["refs"][0]
    return json.dumps({"type": "query", "collection": ref["collection"], "pipeline": ref["pipeline"],
                       "explanation": "reference"}, ensure_ascii=False, separators=(",", ":"))


def main():
    ap = argparse.ArgumentParser(description="Score askmdb-test predictions by execution.")
    ap.add_argument("predictions", nargs="?", help="JSONL with id and raw (and optional level)")
    ap.add_argument("--uri", required=True, help="MongoDB URI where tools/gen.py loaded the databases")
    ap.add_argument("--self-check", action="store_true", help="score the references themselves")
    ap.add_argument("--out", help="write one JSON line per case with the verdict")
    args = ap.parse_args()
    if bool(args.predictions) == args.self_check:
        ap.error("give a predictions file or --self-check")

    cases = [json.loads(line) for line in TEST.read_text(encoding="utf-8").splitlines() if line]
    if args.self_check:
        preds = {c["id"]: {"raw": reference_raw(c)} for c in cases}
    else:
        preds = {}
        for line in Path(args.predictions).read_text(encoding="utf-8").splitlines():
            if line.strip():
                p = json.loads(line)
                preds[p["id"]] = p
        missing = [c["id"] for c in cases if c["id"] not in preds]
        if missing:
            sys.exit(f"{len(missing)} cases without a prediction, e.g. {missing[0]}")

    client = compare.connect(args.uri)
    absent = sorted({c["db"] for c in cases} - set(client.list_database_names()))
    if absent:
        sys.exit(f"{len(absent)} test databases are not loaded at {args.uri} (e.g. {absent[0]}): "
                 "run tools/gen.py first")
    ok_total, fails = 0, Counter()
    by = {"lang": Counter(), "category": Counter(), "n_lang": Counter(), "n_category": Counter()}
    out = open(args.out, "w", encoding="utf-8") if args.out else None
    for c in cases:
        p = preds[c["id"]]
        raw = p.get("raw")
        if raw is not None:
            raw = contract.cut_first_object(raw)
        ok, fail = compare.score_case(c, raw, p.get("level"), client)
        ok_total += ok
        if not ok:
            fails[fail] += 1
        for key in ("lang", "category"):
            by["n_" + key][c[key]] += 1
            by[key][c[key]] += ok
        if out:
            out.write(json.dumps({"id": c["id"], "ok": ok, "fail_type": fail}) + "\n")
    if out:
        out.close()

    n = len(cases)
    lo, hi = wilson(ok_total, n)
    print(f"accuracy {ok_total}/{n} = {100 * ok_total / n:.1f} %  (Wilson 95 % CI {lo:.1f}-{hi:.1f} %)")
    for t in compare.FAIL_TYPES:
        print(f"  {t:<17} {fails[t]}")
    for key in ("lang", "category"):
        print(f"by {key}:")
        for v in sorted(by["n_" + key]):
            print(f"  {v:<15} {by[key][v]}/{by['n_' + key][v]}")


if __name__ == "__main__":
    main()