#!/bin/bash

#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 $1 that matches 'IMG_[0-9][0-9][0-9][0-9]\.JPG'.
while in "$(find "$1" -name 'IMG_[0-9][0-9][0-9][0-9]\.JPG')";do
filename=${-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}"/"${filename}" ];
then cp -- "$" "$2"
echo "$filename is being copied";
else
  if cmp "$" "$2"/"$filename"; then
    echo "rrrr"
    readlink -f "$" >> "$2"/duplicates.txt
    else cp "$" "$.JPG"
    mv "$".JPG "$2"
  fi
fi
done

#
if [[ $$ -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