#!/usr/bin/env bash
#      this title font is insanely over the top for what this does
#  ▄████▄  ▓█████▄      ██████  ▄████▄   ██▀███   ██▓ ██▓███  ▄▄▄█████▓
# ▒██▀ ▀█  ▒██▀ ██▌   ▒██    ▒ ▒██▀ ▀█  ▓██ ▒ ██▒▓██▒▓██░  ██▒▓  ██▒ ▓▒
# ▒▓█    ▄ ░██   █▌   ░ ▓██▄   ▒▓█    ▄ ▓██ ░▄█ ▒▒██▒▓██░ ██▓▒▒ ▓██░ ▒░
# ▒▓▓▄ ▄██▒░▓█▄   ▌     ▒   ██▒▒▓▓▄ ▄██▒▒██▀▀█▄  ░██░▒██▄█▓▒ ▒░ ▓██▓ ░ 
# ▒ ▓███▀ ░░▒████▓    ▒██████▒▒▒ ▓███▀ ░░██▓ ▒██▒░██░▒██▒ ░  ░  ▒██▒ ░ 
# ░ ░▒ ▒  ░ ▒▒▓  ▒    ▒ ▒▓▒ ▒ ░░ ░▒ ▒  ░░ ▒▓ ░▒▓░░▓  ▒▓▒░ ░  ░  ▒ ░░   
#   ░  ▒    ░ ▒  ▒    ░ ░▒  ░ ░  ░  ▒     ░▒ ░ ▒░ ▒ ░░▒ ░         ░    
# ░         ░ ░  ░    ░  ░  ░  ░          ░░   ░  ▒ ░░░         ░      
# ░ ░         ░             ░  ░ ░         ░      ░                    
# ░         ░                  ░                                       
#
#               script to make cd jewel case inserts easily
#               by sun                   https://sx7n8.tech/
#
#               dependencies are:
#               imagemagick, bash

# TODO: add super jewel box and "digipack"
# TODO: make code good


# general info 
# EXT="jpg" # DO NOT CHANGE THIS TO PNG
# TMP="/tmp"
# NAME=work."$EXT" 
# rm -f "$OUTPUT"


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


# help message
HELP="Script to create printable CD jewel case inserts 
Options:

 flags                                           extra options
 -------------------------------------------------------------
 -h: shows this message and exits                         none
 -p: sets paper format  (necessary)                  a4|letter
 -c: sets the album cover path (necessary)              <path>
 -b: sets the back info (necessary)                   no|image
 -i: sets the back image (nec. is b = image)            <path>
 -m: sets a border around everything                 width(px)
 -o: sets output file (necessary)                       <path>

!! DO NOT USE PNG !!
"

###########################################
### TODO: make the code and io not suck ###
###########################################

# getops argument handling
while getopts "hp:c:b:i:m:o:" o; do
    case "${o}" in
        h)
         echo -e "$HELP"
         exit
        ;;

	    p)
	     if [[ "$OPTARG" = "a4" || "$OPTARG" = "letter" ]]; then 
	      PAPER="$OPTARG"
	     else 
          echo "Invalid paper type. Run '$0 -h' for info."
	     exit 1
	     fi
	    ;;

        c)
         if [ -f "$OPTARG" ]; then
          COVER="$OPTARG"
          COVERSIZE="$(identify -format "%w" "$COVER")"
         else 
          echo "Invalid file. Run '$0 -h' for info."
          exit 1
         fi 
        ;;

        b)
         if [[ "$OPTARG" = "no" || "$OPTARG" = "image" ]]; then
          BACKTYPE=$OPTARG
         else
          echo "Invalid back type. Run '$0 -h' for info."
	      exit 1
         fi
        ;;

        i)
        if [[ "$BACKTYPE" = "image" ]]; then
          BACKIMG="$OPTARG"
         else
          echo "Invalid back type. Run '$0 -h' for info."
	      exit 1
         fi
         if [ -f "$OPTARG" ]; then
          :
         else
          echo "Invalid file. Run '$0 -h' for info."
          exit 1
         fi
        ;;

        m)
         BORDER="TRUE"
         BORDER_WIDTH="$OPTARG"
        ;;

        o)
         if [ -f "$OPTARG" ]; then
          echo -e "Error: file already exists."
          exit 1
         else
          OUTPUT="$OPTARG"
         fi
        ;;

        *)
         echo -e "$USAGE"
         exit
        ;;
    esac
done


# check if something is missing
if [ -z "$PAPER" ] || [ -z "$COVER" ] || [ -z "$BACKTYPE" ] || [ -z "$OUTPUT" ]; then
    echo -e "Error: missing options"
    echo -e "$USAGE"
    exit 1
fi


# check if i is missing
if [[ "$BACKTYPE" == "image" && -z "$BACKIMG" ]]; then
    echo -e "Error: missing options"
    echo -e "$USAGE"
    exit 1
fi


# 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)}'; }


# DPI of paper
DPI="300"


# cover art size (mm)
CO_MM="120"
CO_PX="$(CONVERT "$CO_MM" "$DPI")"


# Width and Height of paper in mm
A4MM_W="210"
A4MM_H="297"
LTMM_W="216"
LTMM_H="279"


# same values in pixels
A4PX="$(CONVERT "$A4MM_W" "$DPI")x$(CONVERT "$A4MM_H" "$DPI")"
LTPX="$(CONVERT "$LTMM_W" "$DPI")x$(CONVERT "$LTMM_H" "$DPI")"


# 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 -colorspace sRGB -type TrueColor -depth 8 -size $SIZE canvas:white "$OUTPUT" > /dev/null


# draws border (rectangle)
if [ "$BORDER" = "TRUE" ]; then
INSET=$((BORDER_WIDTH / 2))
magick ""$OUTPUT"" \( -size $((CO_PX + 2 * BORDER_WIDTH))x$((CO_PX * 2 + 2 * BORDER_WIDTH)) xc:none -colorspace sRGB -type TrueColor -depth 8 -fill none -stroke black -strokewidth $BORDER_WIDTH -draw "rectangle $INSET,$INSET $((CO_PX + BORDER_WIDTH - 1)),$((CO_PX * 2 + BORDER_WIDTH - 1))" \) -gravity center -composite ""$OUTPUT""
fi


# add the cover art set to the right size, rotated left by 90d and shifted up by (cover art size) / 2
# TODO: change rotation to a variable to allow different folding points via argument
# TODO: make command multi-line for readibility
magick -colorspace sRGB -type TrueColor -depth 8 "$OUTPUT" \( "$COVER" -resize ${CO_PX}x${CO_PX} -rotate 270 \) -gravity center -geometry +0-$((CO_PX/2)) -composite "$OUTPUT" > /dev/null


# adds back
if [ "$BACKTYPE" = "image" ]; then
magick -colorspace sRGB -type TrueColor -depth 8 "$OUTPUT" \( "$BACKIMG" -resize ${CO_PX}x${CO_PX} -rotate 270 \) -gravity center -geometry +0+$((CO_PX/2)) -composite "$OUTPUT" > /dev/null
else
magick -colorspace sRGB -type TrueColor -depth 8 "$OUTPUT" \( -size ${CO_PX}x${CO_PX} xc:'#FFFFFF' \) -gravity center -geometry +0+$((CO_PX/2)) -composite "$OUTPUT" > /dev/null
fi