"""Generate ToolFault-Bench.

    python scripts/generate.py --out data --seed 20260923

Writes data/test-00000-of-00001.parquet and data/validation-00000-of-00001.parquet.
Deterministic for a given seed.
"""
from __future__ import annotations

import argparse
import json
import os
import random
import sys

sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))

import pandas as pd  # noqa: E402

from common import Ctx, dumps, iso, person, sample_now  # noqa: E402
from domains import DOMAINS, DOMAIN_BY_KEY  # noqa: E402
from templates import PLAN  # noqa: E402

VAL_FRACTION = 0.15


def assignments(subtype: str, n: int, rng: random.Random):
    """Yield (domain, extra) pairs for each item of a subtype."""
    if subtype == "invalid_args":
        for rep in range(n // (len(DOMAINS) * 3)):
            for d in DOMAINS:
                for k in range(3):
                    yield d, {"k": k}
        return
    if subtype == "none_old_timestamp_ok":
        for _ in range(4):
            yield DOMAIN_BY_KEY["brokerage"], {"weekend": True}
        for i in range(n - 4):
            yield DOMAINS[i % len(DOMAINS)], {}
        return
    off = rng.randrange(len(DOMAINS))
    for i in range(n):
        yield DOMAINS[(i + off) % len(DOMAINS)], {}


def build_messages(d, c, it):
    msgs = [{"role": "system", "content": d.system(c)}, {"role": "user", "content": it["request"]}]
    k = 0

    def add(call, result, note=None):
        nonlocal k
        k += 1
        cid = f"call_{k}"
        msgs.append({"role": "assistant", "content": note or "",
                     "tool_calls": [{"id": cid, "type": "function",
                                     "function": {"name": call.tool, "arguments": json.dumps(call.args, ensure_ascii=False)}}]})
        msgs.append({"role": "tool", "tool_call_id": cid, "name": call.tool, "content": dumps(result)})

    for p in it["prefix"]:
        add(p, p.response)
    for call, err, note in it["history"]:
        add(call, err, note)
    add(it["call"], it["result"], it.get("prior_note"))
    return msgs


def generate(seed: int):
    rows = []
    for subtype, (builder, n) in PLAN.items():
        srng = random.Random(f"{seed}:{subtype}")
        count = 0
        for i, (d, extra) in enumerate(assignments(subtype, n, srng)):
            rng = random.Random(f"{seed}:{subtype}:{i}")
            c = Ctx(rng=rng, now=sample_now(rng, weekend=extra.get("weekend", False)), org=rng.choice(d.orgs),
                    user=person(rng), extra=extra)
            it = builder(d, c)
            tools = d.tools(it["overrides"])
            msgs = build_messages(d, c, it)
            rows.append({
                "domain": d.key,
                "subtype": it["subtype"],
                "fault_type": it["fault_type"],
                "next_action": it["next_action"],
                "acceptable_next_actions": list(it["acceptable"]),
                "critical_next_actions": list(it["critical"]),
                "difficulty": it["difficulty"],
                "is_hard_negative": bool(it["is_hard_negative"]),
                "current_time": iso(c.now),
                "user_request": it["request"],
                "tools": json.dumps(tools, ensure_ascii=False),
                "messages": json.dumps(msgs, ensure_ascii=False),
                "num_tool_calls": sum(1 for m in msgs if m["role"] == "tool"),
                "last_tool_name": it["call"].tool,
                "last_tool_result": msgs[-1]["content"],
                "gold_recovery": it["gold_recovery"],
                "rationale": it["rationale"],
                "meta": json.dumps(it["meta"], ensure_ascii=False),
            })
            count += 1
        assert count == n, (subtype, count, n)
    return rows


def split_and_id(rows, seed: int):
    rng = random.Random(f"{seed}:split")
    by_sub = {}
    for r in rows:
        by_sub.setdefault(r["subtype"], []).append(r)
    for rs in by_sub.values():
        rng.shuffle(rs)
        k = max(1, round(len(rs) * VAL_FRACTION))
        for j, r in enumerate(rs):
            r["split"] = "validation" if j < k else "test"
    rows = [r for rs in by_sub.values() for r in rs]
    rng.shuffle(rows)
    for j, r in enumerate(rows):
        r["id"] = f"tfb-{j + 1:04d}"
    return rows


COLUMNS = ["id", "domain", "subtype", "fault_type", "next_action", "acceptable_next_actions", "critical_next_actions",
           "difficulty", "is_hard_negative", "current_time", "user_request", "tools", "messages", "num_tool_calls",
           "last_tool_name", "last_tool_result", "gold_recovery", "rationale", "meta"]


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--out", default="data")
    ap.add_argument("--seed", type=int, default=20260923)
    a = ap.parse_args()
    rows = split_and_id(generate(a.seed), a.seed)
    os.makedirs(a.out, exist_ok=True)
    df = pd.DataFrame(rows)
    for split in ("test", "validation"):
        part = df[df.split == split][COLUMNS].sort_values("id").reset_index(drop=True)
        path = os.path.join(a.out, f"{split}-00000-of-00001.parquet")
        part.to_parquet(path, index=False)
        print(f"{split}: {len(part)} rows -> {path}")


if __name__ == "__main__":
    main()