#!/usr/bin/env bash

# Inspiration: https://www.reddit.com/r/unixporn/comments/f1oied/awesome_global_nightday_switch_for_gtk_vim/

# Requirements:
# glib2: for gsettings for GTK switching under Wayland
# xfce4-settings: for xfsettings for GTK switching under Xorg
# qt5ct: for Qt5 switching 
# adwaita-qt: as Qt5 theme
# sed: for switching multiple things by editing config files
# jq: for switching code by editing JSON
# moreutils: providing sponge for in-place editing code config file
# feh: for setting wallpaper under Xorg
# sway: for setting wallpaper in sway

# enable "strict mode"
set -euo pipefail
IFS=$'\n\t'

CURRENT=$(gsettings get org.gnome.desktop.interface gtk-theme)

if [[ $1 == "dark" ]]; then
  UI_THEME_GTK="Adwaita-dark"
  UI_THEME_QT="Adwaita-Dark"
  UI_VSCODE="Default Dark+"
  UI_ALACRITTY="dark"
  BG_X11="-B black ${HOME}/.wallpaper/light.png"
  BG_SWAY="--color #000000 --image ${HOME}/.wallpaper/light.png"
elif [[ $1 == "light" ]]; then
  UI_THEME_GTK="Adwaita"
  UI_THEME_QT="Adwaita"
  UI_VSCODE="Default Light+"
  UI_ALACRITTY="light"
  BG_X11="-B white ${HOME}/.wallpaper/dark.png"
  BG_SWAY="--color #ffffff --image ${HOME}/.wallpaper/dark.png"
elif [[ $1 == "toggle" ]]; then
  [[ "$CURRENT" == *"dark"* ]] && exec $0 light || exec $0 dark
elif [[ $1 == "reapply" ]]; then
  [[ "$CURRENT" == *"dark"* ]] && exec $0 dark || exec $0 light
else
  exit 1
fi


# set GTK theme
if [[ "$XDG_SESSION_TYPE" == "x11" ]]; then
  # Start xfsettingsd - alreday running xfsettingd ignores this
  xfsettingsd --daemon
  # set GTK theme xia xsettings
  xfconf-query -c xsettings -p /Net/ThemeName -s "$UI_THEME_GTK"
  #xfconf-query -c xsettings -p /Net/IconThemeName -s "$UI_ICONS"
else
  # set GTK theme via gsettings
  gsettings set org.gnome.desktop.interface gtk-theme "$UI_THEME_GTK"
fi

# set Qt theme
sed -i -E "s@^style=.*@style=${UI_THEME_QT}@" ~/.config/qt5ct/qt5ct.conf

# set alacritty theme
sed -i -E "s/^colors: \*.*$/colors: *$UI_ALACRITTY/" ~/.config/alacritty/alacritty.yml

# set vscode theme
f="$HOME/.config/Code - OSS/User/settings.json"
jq ".[\"workbench.colorTheme\"]=\"${UI_VSCODE}\"" "$f" | sponge "$f"

# set background
# properly supply arguments separated by spaces
IFS=$' \n\t'
if [[ "$XDG_SESSION_TYPE" == "x11" ]]; then
  feh --no-fehbg --bg-center ${BG_X11}
elif [[ -n "$SWAYSOCK" ]]; then
  killall -q swaybg || true
  swaybg --mode center $BG_SWAY &
else
  echo "No supported window manager."
  echo "Not setting background"
fi