#!/usr/bin/env python3
"""
Update the single spooler file for a message after sending a reply.
One file per message: read the .pending file (same base), add response data and set status to responded, write back.
No separate .response file; no file deletion.
Usage: ./gitea-issues/write-response-spooler.sh --base <base> --to <addr> --subject "..." --body "..." [--in-reply-to "<msg-id>"]
  base = filename base without extension (e.g. 2026-03-14T094530.a1b2c3d4.user_example.com).
"""
from __future__ import annotations

import argparse
import json
import sys
from datetime import datetime, timezone
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent))
from project_config import data_issues_dir, load_project_config


def main() -> int:
    conf = load_project_config()
    if not conf:
        print("[write-response-spooler] No project config.", file=sys.stderr)
        return 1
    spool = data_issues_dir()
    spool.mkdir(parents=True, exist_ok=True)

    ap = argparse.ArgumentParser(description="Update spooler file in place after sending reply")
    ap.add_argument("--base", required=True, help="Base name (e.g. 2026-03-14T094530.a1b2c3d4.user_example.com)")
    ap.add_argument("--to", required=True, help="Recipient address")
    ap.add_argument("--subject", required=True, help="Subject sent")
    ap.add_argument("--body", required=True, help="Body sent")
    ap.add_argument("--in-reply-to", default="", help="Message-ID we replied to")
    args = ap.parse_args()

    base = args.base.strip()
    if not base or "/" in base or ".." in base:
        print("[write-response-spooler] Invalid --base.", file=sys.stderr)
        return 1
    path = spool / f"{base}.pending"
    if not path.exists():
        print(f"[write-response-spooler] No such file: {path.name}", file=sys.stderr)
        return 1
    try:
        data = json.loads(path.read_text(encoding="utf-8"))
    except (json.JSONDecodeError, OSError) as e:
        print(f"[write-response-spooler] Read error: {e}", file=sys.stderr)
        return 1

    now = datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
    data["status"] = "responded"
    data["response"] = {
        "in_reply_to_message_id": args.in_reply_to or "",
        "to": args.to.strip(),
        "subject": args.subject.strip(),
        "body": args.body,
        "sent_at": now,
    }
    path.write_text(json.dumps(data, ensure_ascii=False, indent=2), encoding="utf-8")
    print(f"[write-response-spooler] Updated {path.name} (status=responded)")
    return 0


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