#!/bin/bash

noofscripts=$(pgrep phar.sh | wc -l)

if [[ $noofscripts -gt 2 ]]; then
echo "Can not run more than one process at a time"
exit
fi


if expr match "$1" "$2">/dev/null; then
echo "error"
exit

elif expr match "$2" "$1" >/dev/null; then
echo "error"
exit
fi

#If a user omits either of the two arguments it displays a helpful message and terminates.

if [ $# -ne 2  ]; then

    echo "usage: Phar image_path archive_path"

   Exit

fi



#If the archive directory does not exist the scripts creates it.

if [ ! -d $2 ]; then

mkdir $2

fi



#If the image source directory does not exist the script reports this error and terminates.

if [ ! -d $1 ]; then

echo "source directory does not exist"

exit

fi



#Loops through every file in $1 that matches 'IMG_[0-9][0-9][0-9][0-9]\.JPG'.

for file in $(find $1 -name 'IMG_[0-9][0-9][0-9][0-9]\.JPG');do

filename=${file: -12}

echo "lll"



#If statement is used to check if there is a file in $2 that matches filename. And if it does not it copies to $2.

#readlink gets the absolute path of the duplicate and sends it duplicate text file.

#if there is already a file with that name but not identical it adds .jpg to avoid overwriting it.

if ([ ! -e ${2}/${filename} ]);

then cp -- $file $2

echo "$filename is being copied";

else

  if cmp $file $2/$filename; then

    echo "rrrr"

    readlink -f $file >> $2/duplicates.txt

    else cp $file "$file.JPG"

    cp $file.JPG $2

  fi

fi

done