#!/bin/bash

# This script assumes a monitor is divided up into the following sections:
# 
#     25%             50%              25%
# +----------+--------------------+----------+
# |          |                    |          |
# |    1     |                    |     4    |
# |          |                    |          |
# +----------+         3          +----------+
# |          |                    |          |
# |    2     |                    |     5    |
# |          |                    |          |
# +----------+--------------------+----------+

# How to use:
# Pass in the Panel #, along with the value you need:
# e.g.   panel_finder.sh -p 1 -v startX
#
# The following values are available:
#
#   startX  - The starting X value (top-left)
#   startY  - The starting Y value (top-left)
#   width   - The width of the panel
#   height  - the height of the panel
#
# You can also pass in an optional -l flag for layout, giving 3 or 5
# the default is 5 panels
#
# @TODO: Add convenience functions to give bottom-right X,Y
# @TODO: Add gap functionality



# -------------------- RND --------------------
round()
{
  echo $(printf %.2f $(echo "scale=$2;((10^$2)*$1)+0.5)/(10^$2)" | bc))
};


#### Get initial values
gap=5
layout=5
herbstString=false

# % of width of side columns, expressed as a decimal
sideColumnWidthRatio=".25"

# number of rows in each Side column. Current Max = 2
numSideColumnRows=2

# use xrandr utility + awk to get the screen width & height in pixels
screenWidth=$(xrandr --current | grep '*' | uniq | awk '{print $1}' | cut -d 'x' -f1)
screenHeight=$(xrandr --current | grep '*' | uniq | awk '{print $1}' | cut -d 'x' -f2)

# Determine actual width of columns, based on GAP and requested ratio size

# this is what we want to achieve, but because bash doesn't support floating-point,
# we have to get creative
# sideColumnWidth=$(( $screenWidth * $sideColumnWidthRatio - $gap | bc -l))
sw=$( echo "$screenWidth*$sideColumnWidthRatio" | bc -l)
# After we get the value, we basically FLOOR by dropping everything .+*
sw=${sw%.*}
sideColumnWidth=$(( $sw - $gap ))
mainColumnWidth=$(( $screenWidth - $sideColumnWidth * 2))

# determine side column panel heights, adjusting for Number of Rows and Gaps (NumRows-1)
sideColumnPanelHeight=$(( $screenHeight / $numSideColumnRows - $gap * ($numSideColumnRows - 1) ))


#-----------------------------------------------------------------------------------------------
#                                           Layouts
# ----------------------------------------------------------------------------------------------
#
#  5 Panel Layout
# -------------------- Panel 1 --------------------
panel5_1_startX=0
panel5_1_startY=0
panel5_1_width=$sideColumnWidth
panel5_1_height=$sideColumnPanelHeight

# -------------------- Panel 2 --------------------
panel5_2_startX=0
panel5_2_startY=$(( $panel1_height + $gap ))
panel5_2_width=$sideColumnWidth
panel5_2_height=$sideColumnPanelHeight

# -------------------- Panel 3 --------------------
panel5_3_startX=$(( $sideColumnWidth + $gap))
panel5_3_startY=0
panel5_3_width=$mainColumnWidth
panel5_3_height=$screenHeight

# -------------------- Panel 4 --------------------
panel5_4_startX=$(( $sideColumnWidth + $mainColumnWidth + $gap * 2))
panel5_4_startY=0
panel5_4_width=$sideColumnWidth
panel5_4_height=$sideColumnPanelHeight

# -------------------- Panel 5 --------------------
panel5_5_startX=$panel4_startX
panel5_5_startY=$(( $panel4_height + $gap ))
panel5_5_width=$sideColumnWidth
panel5_5_height=$sideColumnPanelHeight





# ===========================================================
# 3 Panel Layout
# ===========================================================

# -------------------- Panel 1 --------------------
panel3_1_startX=0
panel3_1_startY=0
panel3_1_width=$sideColumnWidth
panel3_1_height=$screenHeight

#--------------------- Panel 2 --------------------
panel3_2_startX=$(( $sideColumnWidth + $gap))
panel3_2_startY=0
panel3_2_width=$mainColumnWidth
panel3_2_height=$screenHeight

#--------------------- Panel 3 --------------------
panel3_3_startX=$(( $sideColumnWidth + $mainColumnWidth + $gap *2))
panel3_3_startY=0
panel3_3_width=$sideColumnWidth
panel3_3_height=$screenHeight









# -------------------- MAIN --------------------
while getopts p:v:l:h: flag
do
    case "${flag}" in
        p) panel_number=${OPTARG};;
        v) value=${OPTARG};;
        l) layout=${OPTARG:-layout};;
        h) herbst=${OPTARG:-herbstString};;
    esac
done

panel_name="panel${layout}_${panel_number}_${value}"
#varName="${pane}_${value}"
#echo "${!varName}"


# Display the result for a single value
# or optionally for `herbstclient setmonitors <STR>`

if [ "$herbst" = false ] ; then

  echo "${!panel_name}"
  exit 1
fi

# Build the herbst string; widthXHeight+offset+0
#  I think the last 0 is for a tag, but I really don't know
echo "${panel3_1_width}x${panel3_1_height}+0+0 ${panel3_2_width}x${panel3_2_height}+${panel3_2_startX}+0 ${panel3_3_width}x${panel3_3_height}+${panel3_3_startX}+0"