#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
review_queue.py — CLI for the needs_review lifecycle (plan §5c).

Rows land in the queue when dedup leaves a borderline pair separate, or when a
legacy `.doc` source was converted imperfectly. Each row has a stable content
key; a decision written here is stored in data/review_decisions.json (git
tracked) and re-applied by build_database.py on every rebuild, so the queue
never resurfaces a resolved row.

Commands:
    python scripts/review_queue.py list
    python scripts/review_queue.py resolve <id> <merge|keep-separate|drop>
"""

from __future__ import annotations

import argparse
import json
import sqlite3
import sys
from pathlib import Path
from typing import Optional

SCRIPT_DIR = Path(__file__).resolve().parent
REPO_ROOT = SCRIPT_DIR.parent
for _p in (str(SCRIPT_DIR), str(REPO_ROOT)):
    if _p not in sys.path:
        sys.path.insert(0, _p)

from import_common import content_key, normalize_name  # noqa: E402

VALID_DECISIONS = ("merge", "keep-separate", "drop")


# --------------------------------------------------------------------------
# review_decisions.json
# --------------------------------------------------------------------------
def load_decisions(path: Path) -> dict:
    if path.is_file():
        try:
            data = json.loads(path.read_text(encoding="utf-8"))
            if isinstance(data, dict):
                return data
        except (json.JSONDecodeError, OSError):
            pass
    return {}


def save_decisions(decisions: dict, path: Path) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(
        json.dumps(decisions, indent=2, ensure_ascii=False, sort_keys=True),
        encoding="utf-8",
    )


# --------------------------------------------------------------------------
# queue
# --------------------------------------------------------------------------
def list_queue(db_path: Path) -> list[dict]:
    """Return every needs_review row in the current DB, with its content key."""
    if not db_path.is_file():
        return []
    conn = sqlite3.connect(db_path)
    conn.row_factory = sqlite3.Row
    try:
        rows = conn.execute(
            "SELECT name, normalized_name, language, description "
            "FROM activities WHERE needs_review = 1 ORDER BY normalized_name"
        ).fetchall()
    except sqlite3.OperationalError:
        return []
    finally:
        conn.close()

    out = []
    for row in rows:
        norm = row["normalized_name"] or normalize_name(row["name"])
        key = content_key(norm, row["language"], row["description"] or "")
        out.append({
            "id": key,
            "name": row["name"],
            "language": row["language"],
            "description": row["description"] or "",
        })
    return out


def resolve(decisions_path: Path, content_id: str, decision: str) -> dict:
    """Record a decision for a content key in review_decisions.json."""
    if decision not in VALID_DECISIONS:
        raise ValueError(
            f"invalid decision {decision!r}; expected one of {VALID_DECISIONS}"
        )
    decisions = load_decisions(decisions_path)
    decisions[content_id] = {"decision": decision}
    save_decisions(decisions, decisions_path)
    return decisions


# --------------------------------------------------------------------------
# CLI
# --------------------------------------------------------------------------
def main(argv: Optional[list[str]] = None) -> int:
    parser = argparse.ArgumentParser(description="needs_review queue CLI")
    parser.add_argument("--db", default="data/activities.db")
    parser.add_argument("--decisions", default="data/review_decisions.json")
    sub = parser.add_subparsers(dest="command", required=True)

    sub.add_parser("list", help="list rows currently flagged needs_review")

    p_resolve = sub.add_parser("resolve", help="record a decision for a row")
    p_resolve.add_argument("id", help="content id from `list`")
    p_resolve.add_argument("decision", choices=VALID_DECISIONS)

    args = parser.parse_args(argv)

    if args.command == "list":
        rows = list_queue(Path(args.db))
        if not rows:
            print("review queue is empty.")
            return 0
        print(f"{len(rows)} row(s) need review:\n")
        for r in rows:
            desc = r["description"][:80].replace("\n", " ")
            print(f"  id   : {r['id']}")
            print(f"  name : {r['name']}  [{r['language']}]")
            print(f"  desc : {desc}")
            print(f"  -> review_queue.py resolve {r['id']} <merge|keep-separate|drop>")
            print()
        return 0

    if args.command == "resolve":
        resolve(Path(args.decisions), args.id, args.decision)
        print(f"recorded: {args.id} -> {args.decision}")
        print(f"written to {args.decisions} (applied on next build_database --rebuild)")
        return 0

    return 1


if __name__ == "__main__":
    raise SystemExit(main())