#!/usr/bin/env python3
"""start_wr_daemon.py — T21.5 §7: THE canonical daemon restart launcher.

T21.4 live finding: `python3 daemon.py` defaults WR_ROOT to the daemon's
install dir, so a restart silently opened a second event store. This
launcher resolves the root ONCE through scripts/wr_root_resolver.py (the
single authority) and passes it explicitly — nobody has to remember to
export WR_ROOT.
"""
from __future__ import annotations

import os
import subprocess
import sys
import time
import urllib.request
from pathlib import Path

_SCRIPT_DIR = Path(__file__).resolve().parent
sys.path.insert(0, str(_SCRIPT_DIR))
import wr_root_resolver as resolver  # noqa: E402

DAEMON_CODE_CANDIDATES = (
    "/home/nick/.local/share/mimo-wait-resume/daemon.py",
)


def find_daemon_code() -> Path:
    for cand in DAEMON_CODE_CANDIDATES:
        p = Path(cand)
        if p.is_file():
            return p
    raise RuntimeError(f"daemon.py not found in {DAEMON_CODE_CANDIDATES}")


def main() -> int:
    root = resolver.resolve_root()
    daemon = find_daemon_code()
    env = dict(os.environ,
               WR_ROOT=str(root),            # daemon data root
               RUNE_WR_ROOT=str(root),       # adapter-side authority
               RUNE_WR_CODE=str(daemon.parent))
    port = sys.argv[1] if len(sys.argv) > 1 else "8791"
    proc = subprocess.Popen(
        [sys.executable, str(daemon), port],
        env=env, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,
        start_new_session=True)
    # bounded startup probe (process-local, not an external wait)
    for _ in range(20):
        try:
            with urllib.request.urlopen(
                    f"http://127.0.0.1:{port}/health", timeout=1) as r:
                if r.status == 200:
                    print(f"wr daemon up: pid={proc.pid} root={root} "
                          f"port={port}")
                    return 0
        except OSError:
            time.sleep(0.25)
    print(f"wr daemon did not become healthy (pid={proc.pid})", file=sys.stderr)
    return 1


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