#!/bin/sh

twoscreen() {
  mirror=$(printf "no\\nyes" | rofi -dmenu -i -p "Mirror displays?")
  if [ "$mirror" = "yes" ]; then
    external=$(echo "$screens" | rofi -dmenu -i -p "Optimize resolution for")
    internal=$(echo "$screens" | grep -v "$external")
    res_external=$(xrandr --query | sed -n "/^$external/,/\+/p" | \
      tail -n 1 | awk '{print $1}')
    res_internal=$(xrandr --query | sed -n "/^$internal/,/\+/p" | \
      tail -n 1 | awk '{print $1}')
    res_ext_x=$(echo "$res_external" | sed 's/x.*//')
    res_ext_y=$(echo "$res_external" | sed 's/.*x//')
    res_int_x=$(echo "$res_internal" | sed 's/x.*//')
    res_int_y=$(echo "$res_internal" | sed 's/.*x//')
    scale_x=$(echo "$res_ext_x / $res_int_x" | bc -l)
    scale_y=$(echo "$res_ext_y / $res_int_y" | bc -l)
    xrandr --output "$external" --auto --scale 1.0x1.0 \
      --output "$internal" --auto --same-as "$external" \
      --scale "$scale_x"x"$scale_y"
  else
    primary=$(echo "$screens" | rofi -dmenu -i -p "Select primary display")
    secondary=$(echo "$screens" | grep -v "$primary")
    direction=$(printf "left\\nright" | rofi -dmenu -i -p "What side of $primary should $secondary be on?")
    xrandr --output "$primary" --auto --scale 1.0x1.0 --output "$secondary" --"$direction"-of "$primary" --auto --scale 1.0x1.0
  fi
}

home() {
  xrandr --output "DisplayPort-${1}" --mode 2560x1440 $(echo "$allposs" | grep -v "\bDisplayPort-${1}" | awk '{print "--output", $1, "--off"}' | paste -sd ' ' -)
}

onescreen() {
  xrandr --output "$1" --auto --scale 1.0x1.0 $(echo "$allposs" | grep -v "\b$1" | awk '{print "--output", $1, "--off"}' | paste -sd ' ' -)
}

postrun() {
  feh --no-fehbg --bg-scale ~/.local/share/wallpaper
  { killall dunst ; setsid -f dunst ;} >/dev/null 2>&1 # Restart dunst to ensure proper location on screen
  kill -46 $(pidof dwmblocks)
}

# Get all possible displays
allposs=$(xrandr -q | grep "connected")

# Get all connected screens.
screens=$(echo "$allposs" | awk '/ connected/ {print $1}')

# If there's only one screen
[ "$(echo "$screens" | wc -l)" -lt 2 ] &&
  { onescreen "$screens"; postrun; notify-send "💻 Only one screen detected.";  exit ;}

# Get user choice including both and manual selection:
chosen=$(printf -- "home-1\\nhome-2\\n----\\n%s\\n----\\nmulti" "$screens" | rofi -dmenu -i -p "Select display arangement") &&
case "$chosen" in
  "home-1") home 0 ;;
  "home-2") home 1 ;;
  "multi") twoscreen ;;
  "----") exit ;;
  *) onescreen "$chosen" ;;
esac

postrun