#!/usr/bin/env bash
log_file=/var/log/hash-files.log
keys_of_interest=("kMDItemFSCreationDate" "kMDItemFSName")
md5_bin=$(which md5sum)
mktemp_bin=$(which mktemp)
DateTimeStamp=$(date +\%D_\%T)

IFS=$'\n'

set -a
source .env 2>&1 > /dev/null
set +a

## Functions
############

write_log () {
#echo "		++ Write to log.
#		+++++++++++++++"
## Use on systems managed with systemd
#	printf 'hash-files:	%s\n' "$1" | systemd-cat
	printf '%s	hash-files:	%s\n' "$DateTimeStamp" "$1" >> $log_file
}

create_list_of_files () {
#echo "=== Get list of files in $Working_Directory. ===
#=================================================="
	for file in $(find $Working_Fullpath -maxdepth 1 -type f); do
		list_of_files+=( $file )
	done	
	write_log "List of files created successfully."
}

mdls_files () {
	for file in $list_of_files; do
		for line in $(mdls $file); do
			old_IFS=$IFS
			unset IFS
			mdls_key=$(printf "%s" $line | cut -d '=' -f 1)
			mdls_value=$(printf "%s" $line | cut -d '=' -f 2)
			if [[ " ${keys_of_interest[*]} " =~ " ${mdls_key} " ]];then
				IFS=$old_IFS
				: #printf "\n============================\nMDLS Key: %s\nMDLS Value: %s\n============================\n\n" $mdls_key $mdls_value
				unset IFS
			else
				: #echo "Did not print!"
			fi
			IFS=$old_IFS
		done

	done
}
hash_files () {
#echo "=== Hash files. ===
#======================"
	for file in ${list_of_files[@]}; do
		hash=$($md5_bin $file | awk '{ print $1 }')
		list_of_hashes+=( $hash )
	done
	write_log "Files hashed successfully."
}

create_csv () {
#echo "=== Create array of comma-separated-values. ===
#=================================================="
	csv_columns=( "File Path" "File Hash" )
	for key in ${keys_of_interest[@]};do
		csv_columns+=( ${keys_of_interest[key]} )
	done
	IFS=',';echo "${csv_columns[*]}";IFS=$'\n'
#	for i in ${!list_of_files[@]}; do
#		csv_array+=( ${list_of_files[i]},${list_of_hashes[i]} )
#	done
#	export csv_array
#	write_log "CSV Array creation successful."
}

write_data () {
#echo "=== Write data to a .csv file. ===
#===================================="
	temp_csv_file=$($mktemp_bin)
	printf '%s,%s\n' "File Path" "File Hash" >> $temp_csv_file
	for line in ${csv_array[@]};do
		printf '%s\n' $line
	done >> $temp_csv_file
#	cat $temp_csv_file
	write_log "$temp_csv_file written successfully."
}

cleanup () {
	write_log "Cleanup completed successfully."
}

## Main
#######

trap cleanup EXIT

echo "Main Start"
create_list_of_files
mdls_files
hash_files
if [ ${#list_of_files[@]} != ${#list_of_hashes[@]} ];then
	echo "Error! Number of files and hashes differs. Exiting..." && exit
else
	create_csv
fi
#write_data

#while $list_of_files >=1; do
#done


unset IFS