#!/usr/bin/env python3
"""Notification hook: a desktop notification when Claude is waiting on you.

settings.json wires it to `idle_prompt|permission_prompt` (the Notification matcher is the
`notification_type`). Push notifications are off in this setup, so this is the local
counterpart of pi's notify.ts. Uses notify-send where present (the Wayland/GUI hosts) and
silently no-ops on a headless box or without a session bus. Payload fields are read
defensively -- the docs do not pin the Notification input schema: `message`, `title`,
`notification_type`, `cwd`.
"""
import json
import os
import shutil
import subprocess
import sys

TITLES = {
    "idle_prompt": "Claude Code is waiting for you",
    "permission_prompt": "Claude Code needs a permission",
}


def main():
    try:
        data = json.load(sys.stdin)
    except Exception:
        return
    exe = shutil.which("notify-send")
    if not exe:
        return
    kind = data.get("notification_type") or "notification"
    title = data.get("title") or TITLES.get(kind, "Claude Code")
    body = (data.get("message") or "").strip() or kind
    cwd = data.get("cwd") or ""
    if cwd:
        home = os.path.expanduser("~")
        body += "\n" + (("~" + cwd[len(home):]) if cwd.startswith(home) else cwd)
    try:
        subprocess.run(
            [exe, "--app-name=Claude Code", "--urgency=normal", "--expire-time=8000",
             # same tag -> a newer notification replaces the previous one instead of stacking
             f"--hint=string:x-canonical-private-synchronous:claude-code-{kind}",
             title, body],
            timeout=5, capture_output=True,
        )
    except Exception:
        pass


if __name__ == "__main__":
    main()