#!/bin/sh

if [ -z "$1" ]
  then
    sync_freq_hours=24
  else
  	sync_freq_hours=$1
fi
readonly sync_freq_hours

if [ -z "$2" ]
  then
    backup_dir=/backups/borg/
  else
  	backup_dir=$2
fi
readonly backup_dir

# Exit if no backup directory exists
if [ ! -d "$backup_dir" ]; then
  echo "Specified backup directory ($backup_dir) does not exist."
  echo "Provide a valid directory."
  exit 2
fi

if [ -z "$3" ]
  then
    log_dir=/backups/log/
  else
  	log_dir=$3
fi
readonly log_dir

if [ ! -d "$log_dir" ]; then
  echo "Specified log directory ($log_dir) does not exist."
  echo "Provide a valid log directory."
  exit 2
fi

if [ -z "$4" ]
  then
    log_file_prefix=$(cat /proc/sys/kernel/hostname)-sync-all-
  else
  	log_file_prefix=$4
fi
readonly log_file_prefix

# if borg is currently running - stop sync
if [ $(pidof borg | wc -w) -eq 1 ]
then
  echo "Backup is currently in process - exiting sync."
  exit 2
fi

# set up log file
log_file_name="$log_file_prefix$(date +%d%m%Y-%H%M%S)"
log_file_path="$log_dir$log_file_name"
readonly log_file_name
readonly log_file_path

# check log files to determine if a successful sync happened in last 24 hours
sync_freq_minutes=$(($sync_freq_hours * 60))
if [ $(find $log_dir -name "$log_file_prefix*" -mmin -$sync_freq_minutes -exec awk 'END {print $NF}' {} \; | grep 0 | wc -l) -gt 0 ]
then
	echo "Sync was successfully run within last $sync_freq_hours hours."
	echo "Sync would exit now without doing anything."
	exit 0
fi

# some helpers and error handling:
info() { printf "\n%s %s\n\n" "$( date )" "$*" &>> $log_file_path; }
trap 'echo $( date ) Sync interrupted &>> $log_file_path; exit 2' INT TERM

info "Starting sync to pcloud over rclone"

sync_target=mega-gmail
sync_target_dir=DesktopBackups/Manjaro/

rclone copy                                         \
    borg-local:$backup_dir                          \
    $sync_target:$sync_target_dir                   \
    --checksum                                      \
    --delete-after                                  \
    --verbose                                       \
    --log-file $log_file_path                       \

# mega-sync $backup_dir $sync_target_dir -vv

sync_exit=$?

info "Syncing Log Files"

rclone copy                                         \
    borg-local:$log_dir                             \
    $sync_target:$sync_target_dir"backup-logs"      \
    --checksum                                      \
    --delete-after                                  \
    --local-no-check-updated                        \
    --verbose                                       \
    --exclude $log_file_name							          \
    --log-file $log_file_path                       \

# mega-sync $log_dir $sync_target_dir"backup-logs" -vv

log_sync_exit=$?

# use highest exit code as global exit code
global_exit=$(( sync_exit > log_sync_exit ? sync_exit : log_sync_exit ))

if [ ${global_exit} -eq 1 ];
then
    echo "Backup Sync and/or Log Sync finished with a warning" &>> $log_file_path
fi

if [ ${global_exit} -gt 1 ];
then
    echo "Backup Sync and/or Log Sync finished with an error" &>> $log_file_path
fi

echo Sync status - $global_exit &>> $log_file_path

exit ${global_exit}