#!/bin/bash

#Read the backup folders from the config script outside the git repo
. $1
#Example script
#declare -A backup_folders
#backup_folders["/opt/SourceFolderA"]="opt/backup/folderA"
#backup_folders["/opt/SourceFolderB"]="opt/backup/folderB"

#Configuration
logPath=/home/sebastian/ARCHIVE/sebastian/3000_BACKUP/
logFileName="$(date +'%Y-%m-%d_%H-%M')_backupjobs.log"
tmpLogFilePath=/tmp/tmp_backup.log
retryAttempts=2

#Delete logs older than rotationDays
rotationDays=14

#Variables
globalErrors=0
logFilePath="${logPath}${logFileName}"

touch $tmpLogFilePath
touch $logFilePath

echo $logFilePath

#Terminate if the last backup has not finished yet
if pidof -o %PPID -x "$0" > /dev/null; then
	echo "Backup job already running. Exiting..."
	exit
fi

echo "Starting backup job(s)" | tee $tmpLogFilePath


for sourceFolder in "${!backup_folders[@]}"
do
	mkdir -p ${backup_folders[$sourceFolder]}

	while [ "$retryAttempts" -ge "0" ]
	do
		echo "Starting Job" | tee -a $tmpLogFilePath
		echo "SRC: ${sourceFolder}" | tee -a $tmpLogFilePath
		echo "DEST: ${backup_folders[$sourceFolder]}" | tee -a $tmpLogFilePath
		date | tee -a $tmpLogFilePath
		#SSH Host settings need to be set in the ssh client config!
		rsync --delete --out-format="%t %f %''b" -avz $sourceFolder ${backup_folders[$sourceFolder]} | tee -a $tmpLogFilePath 2>&1
		rsyncExitCode=$?
		echo "Ending backup job" | tee -a $tmpLogFilePath
		date | tee -a $tmpLogFilePath
		echo "" | tee -a $tmpLogFilePath

		if [ $rsyncExitCode -eq 0 ]; then
			break
		else
			echo "Error: rsync exited with code $rsyncExitCode. Retrying..." | tee -a $tmpLogFilePath
			retryAttempts=$((retryAttempts-1))
			globalErrors=$((globalErrors+1))
		fi
	done
done

#copy over and delete older logs
cat $tmpLogFilePath > $logFilePath

find $logPath -type f -mtime +$rotationDays -name '*.log' -execdir rm -- '{}' \;

#Mail Notifications
if [ $globalErrors -eq 0 ]; then
	#send mail for success
	echo -e "To:mail@sebastianvendt.de\nFrom:Sebastian@manaslu.home\nSubject:Backup SUCCESSFUL on $(date +'%c')\n\n$(cat $tmpLogFilePath)" | sendmail mail@sebastianvendt.de
else
	#send mail for failure
	echo -e "To:mail@sebastianvendt.de\nFrom:Sebastian@manaslu.home\nSubject:Backup FAILED on $(date +'%c')\n\n$(cat $tmpLogFilePath)" | sendmail mail@sebastianvendt.de
fi

#delete tmp file
rm $tmpLogFilePath