#!/usr/bin/env bash
#      this title font is insanely over the top for what this does
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#
#               script to make cd jewerl case inserts easily
#               by sun                   https://sx7n8.tech/
#
#               dependencies are:
#               imagemagick 

# TODO: add super jewel box and "digipack"


# temp directory where images get created before stitching them
TMP=/tmp 


# message that gets printed if theres missing or unexistant arguments
USAGE="Usage: $0 [OPTIONS] [OUTPUT]\nTry '$0 -h' for more information" 


# help message
HELP="
$0: Script to create printable CD jewel case inserts. Uses imagemagick.\n
Options:\n
-h: shows this message and exits\n
-p: sets paper format. options are 'a4' and 'letter'"


# print the usage message if there are no arguments
if [ $# -eq 0 ]; then
    echo -e $USAGE
fi


# DPIl; Width and Height in mm
A4MM_W="210"
A4MM_H="297"
LTMM_W="216"
LTMM_H="279"
DPI='300'

# function to convert mm to px with dpi
CONVERT() { awk -v mm="$1" -v dpi="$2" 'BEGIN{printf("%d", mm/25.4*dpi + 0.5)}'; }

# 
A4PX="$(CONVERT "$A4MM_W" "$DPI")x$(CONVERT "$A4MM_H" "$DPI")"
LTPX="$(CONVERT "$LTMM_W" "$DPI")x$(CONVERT "$LTMM_H" "$DPI")"


# command line option handling
while getopts ":p:h" o; do
    case "${o}" in
        h)
            echo -e $HELP
	    exit
            ;;
	p)
	    PAPER="$OPTARG"
	    ;;
        *)
            echo -e $USAGE
            ;;
    esac
done


# assign to the 'size' variable the right value
if [ "$PAPER" = "a4" ]; then
    SIZE=$A4PX
elif [ "$PAPER" = "letter" ]; then
    SIZE=$LTPX
else 
    echo "what the fuck did you do"
    exit
fi


# create a blank file with the specified paper type
magick -size $SIZE canvas:white $TMP/front.png