#!/usr/bin/env cached-nix-shell
#! nix-shell -i zsh -p jshon wmutils-core

# Script: bspc-subtract-presel
# Author: Henrik Lissner (w/ credit to @Chrysostomus)
# Usage:
#   bspc-resize-to-presel
#
# (Adapted from Chrysostomus/bspwm-scripts/bin/resizetopresel.sh)
#
# This script resizes the current window by "subtracting" the bspwm preselection
# on the current node. In English, that means this will reduce the window's
# width by 20%:
#
#   bspc node -p east -o 0.2 && bspc-subtract-presel
#
# NOTE: We use zsh for this because bash chokes on float arithmetic.

# Check if the brother node is a receptacle
if [[ $(bspc query -T -n @brother/ | jshon -e client) = null ]]; then
  # Yep, it's a receptacle. Get the real dimensions
  eval $(grep "window_gap" ~/.config/bspwm/rc.d/theme | tr -cd [0-9])
  # Get orientation
  wattr xywh $(pfw) | read focused_x focused_y focused_width focused_height
  receptacle_y=$(bspc query -T -n @brother/ | jshon -e rectangle -e y)
  if [[ "$focused_y" -eq "$receptacle_y" ]]; then
    receptacle_width=$(bspc query -T -n @brother/ | jshon -e rectangle -e width)
    receptacle_x=$(bspc query -T -n @brother/ | jshon -e rectangle -e x)
    # receptacle and window have the same height, so they are side by side
    if [[ receptacle_x -gt focused_x ]]; then
      echo "receptacle is right of the window"
      # get the true window dimension
      true_dim=$(( receptacle_width + gap ))
      # kill the repectacle
      for i in $(bspc query -N -n .leaf.!window.local); do bspc node $i -k; done
      # resize the window
      bspc node @east -r -$true_dim || bspc node @west -r +$true_dim
    else
        echo "receptacle is left of the window"
        # get the true window dimension
        true_dim=$(( receptacle_width + gap ))
        # kill the repectacle
        for i in $(bspc query -N -n .leaf.!window.local); do bspc node $i -k; done
        # resize the window
        bspc node @west -r +$true_dim || bspc node @east -r -$true_dim
    fi
  else
      receptacle_height=$(bspc query -T -n @brother/ | jshon -e rectangle -e height)
      # width is necessarily equal if height is not, because the nodes are
      # brothers Window are on the top of each other
      if [[ receptacle_y -gt focused_y ]]; then
        echo "receptacle is below the window"
        # get the true window dimension
        true_dim=$(( receptacle_height + gap))
        # kill the repectacle
        for i in $(bspc query -N -n .leaf.!window.local); do bspc node $i -k; done
        # resize the window
        bspc node @south -r -$true_dim || bspc node @north -r +$true_dim
      else
          echo "receptacle is above the window"
          # get the true window dimension
          true_dim=$(( receptacle_height + gap))
          # kill the repectacle
          for i in $(bspc query -N -n .leaf.!window.local); do bspc node $i -k; done
          # resize the window
          bspc node @north -r +$true_dim || bspc node @south -r -$true_dim
      fi
  fi
  echo $true_dim
  exit 0
fi

# If the focused window is not preselected, do nothing
[[ "$(bspc query -T -n focused | jshon -e presel)" == null ]] && exit 0

dir=$(bspc query -T -n focused | jshon -e presel -e splitDir | tr -d \")
ratio=$(bspc query -T -n focused | jshon -e presel -e splitRatio)
case "$dir" in
  west)
    cur=$(bspc query -T -n focused | jshon -e rectangle -e width)
    bspc node @west -r +$((${cur}*${ratio})) || \
        bspc node @east -r -$((${cur}*${ratio}))
    ;;
  east)
    cur=$(bspc query -T -n focused | jshon -e rectangle -e width)
    bspc node @east -r -$((${cur}*(1.0-${ratio}))) || \
        bspc node @west -r +$((${cur}*${ratio}))
    ;;

  north)
    cur=$(bspc query -T -n focused | jshon -e rectangle -e height)
    bspc node @north -r +$((${cur}*${ratio})) || \
        bspc node @south -r -$((${cur}*${ratio}))
    ;;
  south)
    cur=$(bspc query -T -n focused | jshon -e rectangle -e height)
    bspc node @south -r -$(( ${cur} * (1.0 - ${ratio}) )) || \
        bspc node @north -r +$(( ${cur} * ${ratio} ))
esac

bspc node -p cancel