#!/usr/bin/env bash
#
# Brings the window of the app that sent the notification to the front.
#
# The notification only carries the app's name ("Google Chrome", "Telegram
# Desktop"); windows carry a class ("google-chrome", "org.telegram.desktop")
# and a title. Both are compared with everything but letters and digits
# stripped, so "Google Chrome" finds "google-chrome". The most recently
# focused matching window wins.
#
# Options (set on the effect in rules.json):
#   window   what to look for instead of the app's name (a class or a title)
set -uo pipefail

want=${AR_OPT_WINDOW:-${AR_APP:-}}
[[ -n $want ]] || exit 0
command -v hyprctl >/dev/null 2>&1 || exit 1
command -v jq >/dev/null 2>&1 || exit 1

find_window() {
  hyprctl -j clients 2>/dev/null | jq -r --arg want "$1" '
    def key: ascii_downcase | gsub("[^a-z0-9]"; "");
    ($want | key) as $w
    | [ .[] | select($w != "" and (
          ((.class // "") | key | contains($w)) or
          ((.initialClass // "") | key | contains($w)) or
          ((.title // "") | key | contains($w)) or
          ((.initialTitle // "") | key | contains($w)))) ]
    | sort_by(.focusHistoryID) | .[0].address // empty'
}

addr=$(find_window "$want")
# "Telegram Desktop" may only match as "telegram": try the first word too.
[[ -n $addr ]] || addr=$(find_window "${want%% *}")
[[ -n $addr ]] || { echo "focus: no window for '$want'" >&2; exit 0; }
# The address goes into a line of Lua for the compositor: only a hex address will do.
[[ $addr =~ ^0x[0-9a-fA-F]{1,16}$ ]] || { echo "focus: odd window address '$addr'" >&2; exit 1; }

# Lua-configured Hyprland takes the dispatcher through eval; older,
# conf-configured installs still take `hyprctl dispatch`.
hyprctl -q eval "hl.dispatch(hl.dsp.focus({ window = \"address:$addr\" }))" >/dev/null 2>&1 \
  || hyprctl -q dispatch focuswindow "address:$addr" >/dev/null 2>&1