#!/bin/sh

##This file was cteated by Chris Wilson (blixtra@gmail.com)
##
##It is a public domain work
##

##
##Imagemagick, Zenity and Gtk are required to run
##

##exit if nothing is selected.
if test $# == 0
then
  zenity --error --title="error" --text="Nothing is selected."
  exit 1
fi

##return 0 if file is image.
isImage () {
  image=`file -bi "$1" | sed 's:/.*::'`
  if test "$image" = "image"
  then
    return 0
  fi
  return 1
}

##if image file is in list of selected files break loop and continue. Otherwise, exit.
counter=0
for i in "$@"
  do
    ((counter += 1))
    if isImage "$i"
    then
      break
    elif test "$counter" = "$#"
    then
      zenity --error --title="error" --text="No images are selected."
      exit 1
    fi
  done      

##exits if "cancel" was entered in one of the dialogs.
wasCanceled () {
  if test "$1" != 0
  then
    exit 1
  fi
}

##resize dialog
resizeTo=`zenity --list --title "Resize Image" --text="What size should the photos be?" --height=260 \
	--column="Size" "Thumbnail (160px)" "X-Small (400px)" "Small (640px)" "Medium (800px)" "Large (1200px)" "X-Large (1600px)" "Original Size"`

wasCanceled "$?"
##gets digits from return string of last dialog (Original Size option returns empty string).
resizeTo=`echo $resizeTo | sed "s/[^[:digit:]]//g"`

##quality dialog
quality=`zenity --list --title "Image Quality" --text="What quality should the photos be?" --height=260 \
	--column="Quality" "Poor (55%)" "Low (65%)" "Good (72%)" "Very Good (80%)" "Best (85%)"`

wasCanceled "$?"
##gets digits from return string of last dialog.
quality=`echo $quality | sed "s/[^[:digit:]]//g"`

##if subfolder doesn't exist creat it.
subFolder="converted"
mkdir -p $subFolder

##the workhorse
processImage () {
  
  ##we only need the filename.
  imgFile=`echo "$1" | sed 's:.*/::g'`
  
  ##don't resize if "Original Size" was selected.
  if test -z $2
  then
    ##if file exists just ignore.
    if test -e "$subFolder/orig-${quality}-$imgFile"
    then
      return
    else
      convert -quality $quality  "$1" "$subFolder/orig-${quality}-$imgFile"
    fi
  else
    ##if file exists just ignore.
    if test -e "$subFolder/${resizeTo}px${quality}-$imgFile"
    then
      return
    else
      convert -quality $quality -resize "${resizeTo}x${resizeTo}" "$1" "$subFolder/${resizeTo}px${quality}-$imgFile"
    fi
  fi
  return
}

progress=0
counter=0

(for i in "$@"
  ##echoed strings starting with "#" are used as text in the the progress window
  ##echoed integers are used as the percentage for the progress bar
  do
    ((counter+=1))
    ((progress = $counter*100/$#)) 
    echo $progress
    
    if test "$progress" = 100
    then
      echo "#Finished! Your resized image(s) are in the\nfolder named \"${subFolder}\" inside this folder."
    else
      echo "#Processing image ${i} ($counter/$#)"
    fi
    
    ##only process images; ignore rest.
    if isImage "$i"
    then
      processImage "$i" "$resizeTo"
    fi
    
    ##pipe into progress window to update.
  done) | zenity --progress --title="Resizing images" --text="Processing image ..." --percentage=${progress}

exit 0