#!/usr/bin/env python3
"""FU-5 (GAP-11) — bootstrap a retrieval gold-set into data/eval/gold-set.jsonl.

The gold-set is the labeled (query → relevant case_law_ids) set the eval harness
(scripts/eval_retrieval.py) measures precision/recall against. This script SEEDS it
automatically; the chair then reviews/augments (rows with source='chair' are never
clobbered). Two seed sources:

  --source citations  : the chosen hybrid signal — "cited == relevant". Reads
        search_relevance_feedback (populated by telemetry.infer_relevance_from_citations
        once decisions cite precedents) ⨝ search_logs, groups by query. Yields nothing
        until decisions accumulate citations + searches are logged with case context.

  --source known_item : known-item retrieval (Manning et al. 2008, ch. 8) — query =
        a precedent's case_name, relevant = that precedent (and any same-named sibling
        in the same corpus). A real, citation-free precision/recall signal available
        TODAY; this is what #52 (test_retrieval_by_name) checked by hand. Use this to
        get a baseline before the citation signal exists.

  --source both (default): emit both. Sources are tagged (bootstrap_known_item /
        bootstrap_citation) so the chair can tell them apart.

Idempotent: regenerates the bootstrap_* rows each run; preserves source='chair' rows.
Merge key = (corpus, normalized query).

Usage (mcp-server venv; needs POSTGRES):
    PY=/home/chaim/legal-ai/mcp-server/.venv/bin/python
    POSTGRES_PASSWORD=… POSTGRES_HOST=127.0.0.1 POSTGRES_PORT=5433 \
        $PY scripts/eval_gold_bootstrap.py --source both
"""
from __future__ import annotations

import argparse
import asyncio
import hashlib
import json
import os
import sys
from pathlib import Path

REPO_ROOT = Path(__file__).resolve().parent.parent
sys.path.insert(0, str(REPO_ROOT / "mcp-server" / "src"))

if "POSTGRES_URL" not in os.environ:
    os.environ["POSTGRES_URL"] = (
        f"postgres://{os.environ.get('POSTGRES_USER','legal_ai')}:"
        f"{os.environ.get('POSTGRES_PASSWORD','')}@"
        f"{os.environ.get('POSTGRES_HOST','127.0.0.1')}:"
        f"{os.environ.get('POSTGRES_PORT','5433')}/"
        f"{os.environ.get('POSTGRES_DB','legal_ai')}"
    )

GOLD_PATH = REPO_ROOT / "data" / "eval" / "gold-set.jsonl"

# search_type (telemetry) → eval corpus name
_TYPE_TO_CORPUS = {"precedent_library": "precedent_library", "internal_decisions": "internal_decisions"}
# case_law.source_kind → eval corpus (which retrieval tool searches it)
_KIND_TO_CORPUS = {"external_upload": "precedent_library", "internal_committee": "internal_decisions"}


def _norm_query(q: str) -> str:
    return " ".join((q or "").split()).strip()


def _entry_id(corpus: str, query: str) -> str:
    h = hashlib.sha1(f"{corpus}|{_norm_query(query)}".encode("utf-8")).hexdigest()[:10]
    return f"g-{h}"


async def _known_item_rows(conn, sample: int | None) -> list[dict]:
    """query = case_name, relevant = all same-named precedents in the same corpus."""
    rows = await conn.fetch(
        "SELECT id, coalesce(case_name,'') AS case_name, coalesce(practice_area,'') AS pa, "
        "source_kind FROM case_law "
        "WHERE source_kind IN ('external_upload','internal_committee') "
        "AND coalesce(searchable, true) AND length(trim(coalesce(case_name,''))) >= 2 "
        "ORDER BY source_kind, case_name")
    # group by (corpus, normalized case_name) → relevant ids
    groups: dict[tuple[str, str], dict] = {}
    for r in rows:
        corpus = _KIND_TO_CORPUS[r["source_kind"]]
        key = (corpus, _norm_query(r["case_name"]))
        g = groups.setdefault(key, {"pa": r["pa"], "ids": []})
        g["ids"].append(str(r["id"]))
    out: list[dict] = []
    for (corpus, name), g in groups.items():
        out.append({
            "id": _entry_id(corpus, name),
            "query": name,
            "practice_area": g["pa"],
            "corpus": corpus,
            "relevant_case_law_ids": g["ids"],
            "source": "bootstrap_known_item",
            "note": f"known-item: search by case_name → expect the case itself ({len(g['ids'])} same-named)",
        })
    out.sort(key=lambda e: (e["corpus"], e["query"]))
    if sample is not None and sample > 0:
        out = out[:sample]
    return out


async def _citation_rows(conn) -> list[dict]:
    """query → relevant case_law_ids, from the cited==relevant signal in
    search_relevance_feedback ⨝ search_logs (score >= 2)."""
    rows = await conn.fetch(
        "SELECT sl.query, sl.search_type, coalesce(sl.practice_area,'') AS pa, "
        "       rf.case_law_id "
        "FROM search_relevance_feedback rf "
        "JOIN search_logs sl ON sl.id = rf.search_log_id "
        "WHERE rf.relevance_score >= 2 AND sl.search_type IN ('precedent_library','internal_decisions')")
    groups: dict[tuple[str, str], dict] = {}
    for r in rows:
        corpus = _TYPE_TO_CORPUS[r["search_type"]]
        key = (corpus, _norm_query(r["query"]))
        g = groups.setdefault(key, {"pa": r["pa"], "ids": set()})
        g["ids"].add(str(r["case_law_id"]))
        if not g["pa"]:
            g["pa"] = r["pa"]
    out: list[dict] = []
    for (corpus, query), g in groups.items():
        out.append({
            "id": _entry_id(corpus, query),
            "query": query,
            "practice_area": g["pa"],
            "corpus": corpus,
            "relevant_case_law_ids": sorted(g["ids"]),
            "source": "bootstrap_citation",
            "note": "cited == relevant (auto-inferred from finalized decisions)",
        })
    out.sort(key=lambda e: (e["corpus"], e["query"]))
    return out


def _load_existing() -> list[dict]:
    if not GOLD_PATH.exists():
        return []
    out = []
    for line in GOLD_PATH.read_text(encoding="utf-8").splitlines():
        line = line.strip()
        if line:
            out.append(json.loads(line))
    return out


def _merge(existing: list[dict], fresh: list[dict]) -> tuple[list[dict], dict]:
    """Keep all source='chair' rows; replace bootstrap_* rows with fresh ones.
    Merge key = (corpus, normalized query). Chair rows win on key conflict."""
    chair = [e for e in existing if e.get("source") == "chair"]
    chair_keys = {(e["corpus"], _norm_query(e["query"])) for e in chair}
    kept_fresh = [e for e in fresh if (e["corpus"], _norm_query(e["query"])) not in chair_keys]
    merged = chair + kept_fresh
    merged.sort(key=lambda e: (e["corpus"], e["source"] != "chair", e["query"]))
    stats = {
        "chair_rows_preserved": len(chair),
        "bootstrap_rows": len(kept_fresh),
        "total": len(merged),
    }
    return merged, stats


async def main() -> int:
    ap = argparse.ArgumentParser(description="FU-5 gold-set bootstrap")
    ap.add_argument("--source", choices=["citations", "known_item", "both"], default="both")
    ap.add_argument("--sample", type=int, default=None, help="cap known-item queries (default: all named)")
    args = ap.parse_args()

    from legal_mcp.services import db
    pool = await db.get_pool()
    fresh: list[dict] = []
    async with pool.acquire() as conn:
        if args.source in ("citations", "both"):
            cit = await _citation_rows(conn)
            fresh += cit
            print(f"citation source: {len(cit)} queries")
        if args.source in ("known_item", "both"):
            ki = await _known_item_rows(conn, args.sample)
            fresh += ki
            print(f"known-item source: {len(ki)} queries")

    existing = _load_existing()
    merged, stats = _merge(existing, fresh)
    GOLD_PATH.parent.mkdir(parents=True, exist_ok=True)
    with GOLD_PATH.open("w", encoding="utf-8") as f:
        for e in merged:
            f.write(json.dumps(e, ensure_ascii=False) + "\n")
    print(f"wrote {GOLD_PATH}")
    print(f"  chair rows preserved: {stats['chair_rows_preserved']}")
    print(f"  bootstrap rows:       {stats['bootstrap_rows']}")
    print(f"  total gold queries:   {stats['total']}")
    if stats["total"] == 0:
        print("  NOTE: gold-set empty — no citation signal yet and no named precedents found.")
    return 0


if __name__ == "__main__":
    sys.exit(asyncio.run(main()))