#! /bin/bash

# ===== some constants
WIDTH=240
HEIGHT=240
OVERLAPWIDTH=0
OVERLAPHEIGHT=0
SCREENHEIGHT=265
SCREENWIDTH=240
QUALITY=50

# ===== the filenames
INFILE=$1
EXTENSION=${INFILE/#*.}
OUTFILE=${1/.$EXTENSION}

# ===== check the syntax
if [[ "$1" == "" ]]; then
    echo "USAGE: maptozaurus IMAGEFILE [image type]"
    echo "       image type optional, for example gif,png,jpg"
    echo "       for more image types do a \"man convert\""
    exit 1
fi

# ==== is there a file-conflict
if [ -d ./home ]; then
    echo "There's already a ./home folder. Please remove that first!"
    exit 1
fi
if [ -e ./control ]; then
    echo "There's already a control file. Remove it first!"
    exit 1
fi
if [ -e ./control.tar.gz ]; then
    echo "There's already a control.tar.gz file. Remove it first!"
    exit 1
fi
if [ -e ./data.tar.gz ]; then
    echo "There's already a data.tar.gz file. Remove it first!"
    exit 1
fi

# ===== Is ImageMagick installed?
if [[ "`which identify`" == "" ]]; then
    echo Cannot find the program \"identify\"! Is \"ImageMagick\" installed?
    exit 2;
fi

# ===== image type for the maps
echo Extracting picture information...
IDENTIFY_STR=`identify -format "%m %w %h" $INFILE`
if [[ "$2" != "" ]]; then
    EXTENSION="$2"
else
    EXTENSION=`echo "$IDENTIFY_STR" | cut -d" " -f1`
fi

# ===== make it lowercase
EXTENSION=`echo "$EXTENSION" | tr [A-Z] [a-z]`

if [[ "$EXTENSION" == "jpeg" ]]; then
    EXTENSION=jpg
fi

# ===== no converter specified?
if [[ "`which convert`" == "" ]]; then
    echo Cannot find the program \"convert\"!
    exit 2
fi
if [[ "$EXTENSION" == "" ]]; then
    echo Cannot identify the image-type or cannot find the file!
    exit 2
fi
if [ -d ./${OUTFILE} ]; then
    echo "There's already an image folder ${OUTFILE}."
    exit 2
fi
mkdir "$OUTFILE"
cd "$OUTFILE"
INFILE="../$INFILE"

# ===== get the image size
MAXWIDTH=`echo $IDENTIFY_STR | cut -d" " -f2`
MAXHEIGHT=`echo $IDENTIFY_STR | cut -d" " -f3`
echo Recognized size: $MAXWIDTH/$MAXHEIGHT

# ===== set some variables
X=0
Y=0
XMAX=$[$MAXWIDTH/$WIDTH+1]
if [[ $[$XMAX*$[$WIDTH-$OVERLAPWIDTH]] == $[$MAXWIDTH+$WIDTH] ]]; then
    XMAX=$[$XMAX-1]
fi
YMAX=$[$MAXHEIGHT/$HEIGHT+1]
if [[ $[$YMAX*$[$HEIGHT-$OVERLAPHEIGHT]] == $[$MAXHEIGHT+$HEIGHT] ]]; then
    YMAX=$[$YMAX-1]
fi
echo Splitting from 0/0 to $[XMAX-1]/$[YMAX-1]

# ===== cutting image into pieces
convert -crop "$WIDTH"x"$HEIGHT" -quality $QUALITY "$INFILE" "$OUTFILE"_"%d"."$EXTENSION"

# ===== renaming files
while [[ $Y != $YMAX ]]; do
    while [[ $X != $XMAX ]]; do
	echo Processing $X/$Y
	if [[ "$EXTENSION" == "gif" ]]; then # ppmtogif generates better gif files!
	  cat "$OUTFILE"_$[$Y*$XMAX+$X]."$EXTENSION" | giftopnm | ppmtogif > "$OUTFILE"_"$X"_"$Y"."$EXTENSION"
	  rm "$OUTFILE"_$[$Y*$XMAX+$X]."$EXTENSION"
	else
	  mv "$OUTFILE"_$[$Y*$XMAX+$X]."$EXTENSION" "$OUTFILE"_"$X"_"$Y"."$EXTENSION"
	fi
	# ===== next column
	X=$[$X+1]
    done
    # ===== next row
    X=0
    Y=$[$Y+1]
done

# ===== adding overview
if [[ "$EXTENSION" == "gif" ]]; then
  convert -geometry "$SCREENWIDTH"x"$SCREENHEIGHT" "$INFILE" -colors 31 temp.gif
  cat temp.gif | giftopnm | ppmtogif > "$OUTFILE"_ov."$EXTENSION"
  rm temp.gif
else 
  convert -geometry "$SCREENWIDTH"x"$SCREENHEIGHT" "$INFILE" "$OUTFILE"_ov."$EXTENSION"
fi

# ===== leaving image-folder
cd ..

# ===== creating folders for ipkg
echo Creating the right folders

mkdir ./home
mkdir ./home/QtPalmtop
mkdir ./home/QtPalmtop/share
mkdir ./home/QtPalmtop/share/jmap

# ===== moving the image-files into the right folder
mv ${OUTFILE} ./home/QtPalmtop/share/jmap/

# ===== make a nice ipkg
DATE=$(date +"%Y%m%d")
FILE=./jmap-${OUTFILE}_${DATE}_arm.ipk

# ===== package-information
echo -ne "Package: jmap-${OUTFILE}
InstalledSize: $(du -sh ./home | cut -f1)
Filename: ${FILE}
Maintainer: $(whoami)
Architecture: arm
Version: ${DATE}
Description: JMap ${OUTFILE}
" > ./control

# ===== creating
tar -czf data.tar.gz ./home
tar -czf control.tar.gz ./control
tar -czf ${FILE} ./data.tar.gz ./control.tar.gz

# ===== removing temp-files
rm ./data.tar.gz ./control.tar.gz ./control

# ===== removing the NEW folders and NEW created images
rm -rf ./home