#!/usr/bin/env python3
from __future__ import annotations

import argparse
import json
import sys
from pathlib import Path

_ROOT_DIR = Path(__file__).resolve().parents[1]
if str(_ROOT_DIR) not in sys.path:
    sys.path.insert(0, str(_ROOT_DIR))

from scripts.packlib import PackError, load_plan, load_state, select_next_packet  # noqa: E402


def main() -> int:
    parser = argparse.ArgumentParser(
        description="Select the next ready ITWorx MCP Hub work packet."
    )
    parser.add_argument("--json", action="store_true", help="emit JSON")
    args = parser.parse_args()

    try:
        selection = select_next_packet(load_plan(), load_state())
    except PackError as exc:
        print(f"ERROR: {exc}", file=sys.stderr)
        return 2

    if selection.packet is None:
        payload = {"packet": None, "reason": selection.reason}
        print(json.dumps(payload, indent=2) if args.json else selection.reason)
        return 0 if selection.reason == "all packets completed" else 3

    packet = selection.packet
    payload = {
        "packet": packet["id"],
        "title": packet.get("title"),
        "effort": packet.get("effort"),
        "dependencies": packet.get("deps", []),
        "reason": selection.reason,
        "document": f"implementation/work-packets/{packet['id']}.md",
    }
    if args.json:
        print(json.dumps(payload, indent=2))
    else:
        print(
            f"{packet['id']} — {packet.get('title')} [{packet.get('effort')}] ({selection.reason})"
        )
        print(payload["document"])
    return 0


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