#!/bin/bash

_err=0
which 7z >/dev/null || let _err="_err+1"
which s-nail >/dev/null || let _err="_err+2"

if [[ $_err -ge 2 ]]; then echo "Please install s-nail.";fi
if [[ $_err -eq 1 ]] || [[ $_err -eq 3 ]]; then echo "Please install p7zip-full.";fi
[ $_err -ge 1 ] && exit;


source /path/to/your/smtp-creds.sh
if [ $? -ne 0 ]; then echo "Please fill in the path to your smtp-creds.sh file.";exit;fi

if [ $smtp_defaults -eq 1 ]; then echo "Please edit your smtp-creds file.";exit;fi

backupdate=`date +%Y-%m-%d_%H-%M-%S%z`

logfile="/mnt/b/Backups/ProgramFiles/ProgramFiles-$backupdate.log"
backupdir="/mnt/b/Backups/ProgramFiles"

isodate=`date +%Y-%m-%d_%H-%M-%S%z`
echo -e "[$isodate] Backup script starting" >> $logfile

isodate=`date +%Y-%m-%d_%H-%M-%S%z`
echo -e "[$isodate] Checking for backups older than 7 days..." >> $logfile

oldbackups=`find $backupdir -type f -mtime +7 -exec ls -lh {} \;`

isodate=`date +%Y-%m-%d_%H-%M-%S%z`
echo -e "[$isodate] Found the following backups to be deleted:\n" >> $logfile

echo -e $oldbackups | sed 's/\.7z\ /\.7z\n/g' >> $logfile

isodate=`date +%Y-%m-%d_%H-%M-%S%z`
echo -e "\n[$isodate] Deleting the above backups..." >> $logfile
echo -e $oldbackups | sed 's/\.7z\ /\.7z\n/g' | rev | cut -d' ' -f1 | rev | grep 1 | xargs rm -f

isodate=`date +%Y-%m-%d_%H-%M-%S%z`
echo -e "[$isodate] Old backups deleted." >> $logfile

echo -e "[$isodate] Starting the backup...\n\n" >> $logfile
# Run the backup
7z a $backupdir/ProgramFiles-$backupdate.7z -x\!/mnt/c/Program\ Files/Common\ Files/* /mnt/c/Program\ Files /mnt/c/Program\ Files\ \(x86\) >> $logfile

isodate=`date +%Y-%m-%d_%H-%M-%S%z`
echo -e "[$isodate] The backup has completed." >> $logfile

backupsize=`ls -lh $backupdir/ProgramFiles-$backupdate.7z | cut -d' ' -f5`

echo -e "[$isodate] The backup file's size is $backupsize." >> $logfile

isodate=`date +%Y-%m-%d_%H-%M-%S%z`
echo -e "\n\n\n[$isodate] Backup script completed, sending email." >> $logfile
cat $logfile | s-nail -s "Weekly Program Files Backup Results" -S smtp-use-starttls -S ssl-verify=ignore -S smtp-auth=login -S smtp=smtp://$smtp_relay:587 -S from="$smtp_from" -S smtp-auth-user=$smtp_user -S smtp-auth-password=$smtp_pass -S ssl-verify=ignore $smtp_to >> $logfile