#!/bin/bash
# Required condition:ecryptfs is used. /home/USER_NAME/.Private is a symbolic link to /media/data/Encrypted. The encrypted files and directories in /media/data/Encrypted are decrypted in /media/data/Decrypted. Symbolic links are not copied to /media/data/Decrypted.
curdir=$pwd
langbackup=$LANG
LANG=C
dir1=/home/$USER/.Private
dir2=/media/data/Encrypted
dir3=/media/data/Decrypted
if [ $USER != root  ];then
  # User is ordinary user
  if [ -n "$(ls -l $dir1|grep ^l|grep $dir1' -> '$dir2)" ];then
    # $dir1 is a symbolic link to $dir2.
    if [ -z "$(mount|grep ^$dir1' on '$dir3' type ecryptfs')" ];then
      zenity --title="ecryptfs encrypt tool" --warning --text="$dir1 is not mounted on $dir3. I will mount."
      ecryptfs-mount-private
      if [ -z "$(mount|grep ^$dir1' on '$dir3' type ecryptfs')" ];then
        zenity --title="ecryptfs encrypt tool" --error --text="Mounting $dir1 on $dir3 failed. Aborted!"
        LANG=$langbackup
        exit 1
      else
        zenity --title="ecryptfs encrypt tool" --info --text="$dir1 is successfully mounted on $dir3."
      fi
    fi
    zenity --title="ecryptfs encrypt tool" --info --text="Selcect files to be encrypted via ecryptfs in the next window"
    origin=$(zenity --title="ecryptfs encrypt tool" --file-selection --multiple --separator=" ")
    if [ $? = 1 ];then
      zenity --title="ecryptfs encrypt tool" --warning --text="This script is aborted because cancel is selected."
      LANG=$langbackup
      exit 1
    fi
    for file in $origin;do
      if [ -z "$(echo "$file"|grep ^/)" ];then
        zenity --title="ecryptfs encrypt tool" --warning --text="There is no file named $file . I will skip this file."
        continue
      elif [ -f "$file" ];then
         file1="$file"
      elif [ -L "$file" ];then
        file1="$(readlink -eq $file)"
        zenity --title="ecryptfs encrypt tool" --warning --text="$file is a symbolic link. I will use $file1 instead."
        if [ -f "$file1" ];then
           :
        else
          zenity --title="ecryptfs encrypt tool" --warning --text="$file1 is not an ordinary file. I will skip this."
          continue
        fi
      else
        zenity --title="ecryptfs encrypt tool" --warning --text="$file is not an ordinary file. I will skip this."
        continue
      fi
      name1=$(basename $file1)
operation1 () {
        cp -a $file1 $dir3/$1/$name1 || zenity --title="ecryptfs encrypt tool" --error --text="Copying $file1 to $dir3/$1/$name1 failed!"
        if [ -f $dir3/$1/$name1 ];then
          rm $file1 && (cd $(echo "$file1"|sed -e "s@[^/]*\$@@");ln -s $dir3/$1/$name1 $name1;zenity --title="ecryptfs encrypt tool" --info --text="$file1 = $file is encrypted and moved to $dir3/$1/$name1. Symbolic link $file1 is generated.") || zenity --title="ecryptfs encrypt tool" --error --text="Moving $file1 to $dir3/$1/$name1 failed! $file1 = $file is not encrypted!"
          cd $curdir
        else
          zenity --title="ecryptfs encrypt tool" --error --text="$file1 = $file is tried to be encrypted and copied to $dir3/$1/$name1. But, the generated $dir3/$1/$name1 is not an ordianary file."
        fi
}
      dir4=1
      while :;do
        if [ ! -e $dir3/$dir4/$name1 ];then
          operation1 $dir4
          break
        else
          if [ $dir3/$dir4/$name1 = $file1 ];then
            zenity --title="ecryptfs encrypt tool" --info --text="$file is already encrypted as $dir3/$dir4/$name1."
            continue
          else
            dir4=$(expr 1 + $dir4)
            if [ ! -e $dir3/$dir4 ];then
              mkdir -p $dir3/$dir4 && zenity --title="ecryptfs encrypt tool" --info --text="$dir3/$dir4 is formed."
            fi
            if [ ! -d $dir3/$dir4 ];then
              zenity --title="ecryptfs encrypt tool" --error --text="$dir3/$dir4 is not a directory. $file = $file1 is not encrypted."
              break
            fi
          fi
        fi
      done
    done
  else
    # $dir1 is not a symbolic link to $dir2.
    zenity --title="ecryptfs encrypt tool" --error "$dir1 is not a symbolic link to $dir2. Aborted!"
    LANG=$langbackup
    exit 1
  fi
else
  # User is root.
  zenity --title="ecryptfs encrypt tool" --warning "Please execute me with a ordinary user account. Aborted!"
  LANG=$langbackup
  exit 1
fi
LANG=$langbackup
exit 0