#!/bin/sh

lockfile="/tmp/duplicacy.lock"
LOGFILE="/var/log/duplicacy/duplicacy_$(date +%Y%m%d-%H%M%S).log"
LATEST_DUPLICACY_VERSION="ls -lha $(dirname "$0")/binaries/ | awk '/-rw/{print substr($9,length($9)-4);exit}'"
LATEST_DUPLICACY_VERSION="2.7.2"

# make log directory
if [ ! -d $(dirname ${LOGFILE}) ]; then
        mkdir $(dirname ${LOGFILE}) > /dev/null
fi

if [ -e ${lockfile} ] && kill -0 `cat ${lockfile}`; then
        echo "duplicacy backup already running" >> ${LOGFILE}
        exit
fi

# make sure the lockfile is removed when we exit and then claim it
trap "rm -f ${lockfile}; exit" INT TERM EXIT
echo $$ > ${lockfile}

# self update
cd $(dirname "$0")
git pull > /dev/null

# Duplicacy version update
INSTALLED_DUPLICACY_VERSION=$(duplicacy -h | awk '/VERSION:/{getline; print $1}')
if [ ${LATEST_DUPLICACY_VERSION} != ${INSTALLED_DUPLICACY_VERSION} ] || [ ! -e '/usr/bin/duplicacy' ]; then
        # Determine the Kernel and Architecture
        KERNEL=$(uname)
        ARCH=$(uname -m)
        if [ ${KERNEL} == 'Linux' ]; then
                if [ ${ARCH} == 'x86_64' ]; then
                        curl -sSL -o /usr/bin/duplicacy https://github.com/gilbertchen/duplicacy/releases/download/v${LATEST_DUPLICACY_VERSION}/duplicacy_linux_x64_${LATEST_DUPLICACY_VERSION}
                        chmod +x /usr/bin/duplicacy >> ${LOGFILE}
                elif [ ${ARCH} == 'aarch64' ]; then
                        curl -sSL -o /usr/bin/duplicacy https://github.com/gilbertchen/duplicacy/releases/download/v${LATEST_DUPLICACY_VERSION}/duplicacy_linux_arm64_${LATEST_DUPLICACY_VERSION}
                        chmod +x /usr/bin/duplicacy >> ${LOGFILE}
                else
                        echo "Kernel Type: ${KERNEL}"
                        echo "Arch: ${ARCH}"
                        echo "Arch not supported."
                exit
                fi
        elif [ ${KERNEL} == 'FreeBSD' ]; then
                if [ ${ARCH} == 'amd64' ]; then
                        curl -sSL -o /usr/bin/duplicacy https://github.com/gilbertchen/duplicacy/releases/download/v${LATEST_DUPLICACY_VERSION}/duplicacy_freebsd_x64_${LATEST_DUPLICACY_VERSION}
                        chmod +x /usr/bin/duplicacy >> ${LOGFILE}
                else
                        echo "Kernel Type: ${KERNEL}"
                        echo "Arch: ${ARCH}"
                        echo "Arch not supported."
                exit
                fi
        else
                echo "Kernel Type: ${KERNEL}"
                echo "Arch: ${ARCH}"
                echo "Kernel not supported."
                exit
        fi
fi

# check if the /.duplicacy/preferences file exists before continuing
if [ ! -e "/.duplicacy/preferences" ] || [ ! -e "/.duplicacy/filters" ]; then
        echo "ERROR: Duplicacy not yet configured.  Please refer to readme file"
        exit
fi

# run the backup
cd /
duplicacy -verbose -log backup -stats >> ${LOGFILE} 2>&1

# prune the backup
duplicacy -verbose -log prune -keep 0:360 -keep 30:180 -keep 7:30 -keep 1:7 >> ${LOGFILE} 2>&1

# copy the backup to offsite but only if the backup id as passed in
if [ "${1}" == "--copyOffsite" ] || [ "${1}" == "-c" ]; then
        BACKUP_ID=$(awk '/"id"/{print substr($2,2,length($2)-3);exit}' /.duplicacy/preferences)
        duplicacy -verbose -log copy -to GauntBackupCRO -id ${BACKUP_ID} >> ${LOGFILE} 2>&1
        duplicacy -verbose -log copy -to GauntBackupGail -id ${BACKUP_ID} >> ${LOGFILE} 2>&1
fi

# compress the logs
gzip $(dirname ${LOGFILE})/*.log

# clean up lockfile
rm -f ${lockfile}