#!/bin/sh
#Version 3.1
#Program to rationalise the off site backup in comparison to the current client file system.

processFolder() {
        if !(test -d "$1") then
                echo "do stuff with file"
                # Use cases for file checking:
                #       a) SRC has a file DEST doesn't < Warning report
                #       b) DEST has a file SRC doesn't < Mark for deletion
                #       c) SRC has a bigger size file to DEST < Warning report
                #       d) DEST has a bigger file size to SRC < Warning report
                #*      e) SRC has a diff date file to DEST < Warning report
                #       f) DEST has a directory SRC doesn't < Mark for deletion

                # Pesudo Code for file checking:
                #       if exits on SRC = yes then
                #               if same size = yes then
                #                       process_folder
                #               if same size = no then #c), d)
                #                       flag warning
                #       if exist on SRC = no then #b)
                #               mark for deletion
                #
                #elif item = directory then
                #       if exists on SRC = yes then
                #               process_folder
                #       if exists on SRC = no then #f)
                #               mark for deletion
                #
                #else
                #       echo "'current item' Is not file or directory"               


 
                # Existence checking
                # Need help here:
                # Does file exist on client server?

                # Size Checking               
                # BAKS contains size of file1
                # CLNTS contains size of file2
                BAKS=$(stat -c%s "$1")
                CLNTS=$(stat -c%s "$2")
                if [[ "$BAKS" -lt "$CLNTS" ]]; then
                          echo "Bbackup file is smaller"
                          echo "Warning, backup not successful"
                elif [[ "$BAKS" -gt "$CLNTS" ]]; then
                         echo "Client file size is smaller"
                         echo "Warning, backup not successful"
                elif [[ "$BAKS" -eq "$CLNTS" ]]; then
                         processFolder ()
                fi
               
        else
                cd $1
                for i in *
                do
                        processFolder "$i"
                done
        fi
}

parseArgs()
{
                if [  $# -lt 4 -o $# -gt 5 ]; then
                        printHelp
                        return 1;
                else

                        while [ $# -gt 0 ]
                        do
                                case "$1" in
                                        -d)   D_ARG=1;;
                                        -c)   CF_ARG=1; CF_VAL=$2; shift;;
                                        -b)   BF_ARG=1; BF_VAL=$2; shift;;
                                        ?) printHelp;;
                                        *) echo "$1 not an option"; printHelp;;
                                esac
                                shift
                        done
                fi
}

printHelp()
{
        echo "Usage: $0 -d -c [filename] -b [folder location]"
        echo ""
        echo "-d = Dry-run."
        echo "          ie. Run through the program as normal but only output a file with the changes that could be made."
        echo ""
        echo "-c = Client File input."
        echo "          ie. Supply the location and name of the previously generated client file list."
        echo ""
        echo "-b = Backup Folder Location."
        echo "          ie. Supply the location of where the backup is currently stored."

}

#main starts here

echo "Welcome to version 3.1"
echo "Initilising variables"
echo ""

#CF = Client File
#BS = Backup Folder
#D = Dry-run
CF_ARG=0
CF_VAL=
BF_ARG=0
BF_VAL=
D_ARG=0

parseArgs $*
PARGS=$?

if [ $PARGS -eq 0 ]; then

        echo "Reading client file " $CF_VAL
        echo "Reading backup folder " $BF_VAL
        processFolder $BF_VAL
        return $?

else
        return $PARGS
fi