#!/bin/sh
# nosignal-app-theme-sync — make external apps follow Caelestia's light/dark mode.
#
# Reads Caelestia's current mode (`caelestia scheme get` -> "Mode: dark|light")
# and publishes it so toolkit apps follow:
#   * gsettings color-scheme  -> xdg-desktop-portal(-gtk) org.freedesktop.appearance
#     => Chrome/Chromium, Electron, Firefox, GTK4/libadwaita, Qt6 all follow.
#   * GTK3 prefer-dark flag in gtk-3.0/gtk-4.0 settings.ini for legacy GTK apps
#     that don't read the portal.
# Idempotent; safe to run repeatedly. Invoked at login and on scheme change by
# the nosignal-app-theme .service/.path units.
set -u

mode=$(caelestia scheme get 2>/dev/null | awk -F': *' '/Mode:/{print tolower($2); exit}')
case "$mode" in
  dark)  cs=prefer-dark;  pd=true  ;;
  light) cs=prefer-light; pd=false ;;
  *)     cs=default;      pd=false ;;   # unknown -> no preference
esac

# 1. master switch (portal): Chrome / Electron / Firefox / GTK4 / Qt6
if command -v gsettings >/dev/null 2>&1; then
  gsettings set org.gnome.desktop.interface color-scheme "$cs" 2>/dev/null || true
fi

# 2. legacy GTK3 (+GTK4) prefer-dark flag for apps that ignore the portal
for v in 3.0 4.0; do
  d="${XDG_CONFIG_HOME:-$HOME/.config}/gtk-$v"; f="$d/settings.ini"
  mkdir -p "$d"
  [ -f "$f" ] || printf '[Settings]\n' > "$f"
  grep -q '^\[Settings\]' "$f" || printf '[Settings]\n' >> "$f"
  if grep -q '^gtk-application-prefer-dark-theme' "$f"; then
    sed -i "s/^gtk-application-prefer-dark-theme.*/gtk-application-prefer-dark-theme=$pd/" "$f"
  else
    printf 'gtk-application-prefer-dark-theme=%s\n' "$pd" >> "$f"
  fi
done

echo "app-theme: caelestia mode=${mode:-unknown} -> color-scheme=$cs, gtk prefer-dark=$pd"