#!/bin/bash

now=$(date +"%s")
backup_dir="/backup/$now"

if [ $(whoami) != root ]; then
        echo "You must run it as sudo."
        exit 1
fi

log() {
        echo "[$(date)] $*"
}

backup_db() {
        sudo -iu postgres pg_dump -Fc "$1" > "${backup_dir}/${1}.dump"
}
backup_dir() {
        tar cpf "${backup_dir}/${1}.tar" "$2"
}

checksum() {
        client=$(md5sum "${backup_dir}/$1")
        clientSUM=${client%' '*}
        server=$(sudo -iu foxbackup ssh -p2442 42.42.42.2 "md5sum /mnt/foxbackups/backup1/$now/$1")
        serverSUM=${server%' '*}
        if [[ $clientSUM == $serverSUM ]]; then
                echo "[$(date)] Hash-sum of $1 on the client and on the server are equal. "
        else
                echo "[$(date)] WARNING!!! HASH-SUM $1 ON THE CLIENT AND ON THE SERVER ARE NOT EQUAL!"
                echo "WARNIG!!! HASH-SUM OF $1 ON THE CLIENT AND ON THE SERVER ARE NOT EQUAL!" >> /etc/motd
        fi
}

startBackup() {
        #Start
        mkdir -p "${backup_dir}"
        log "Starting backup"
        #Backing up a directories
        log "Backing up /opt..."
        backup_dir opt /opt
        log "/opt is backed up, starting to backup nextcloud..."
        backup_dir nextcloud /var/www/nextcloud
        log "Nextcloud is backed up, starting to backup game servers..."
        backup_dir servers /home/servers
        log "Servers are backed up, starting to backup mailbox."
        backup_dir mail /var/mail
        log "Mail are backed up, starting to backup peertube"
        backup_dir peertube /var/www/peertube
        log "Peertube are backed up, starting to backup DBs..."
        #Backing up a DBs
        log "Backing up synapse DB"
        backup_db synapse
        log "Synapse DB is backed up, backing up nextcloud DB..."
        backup_db nextclouddb
        log "Nextcloud DB is backed up, backing up pleroma DB..."
        backup_db pleroma
        log "Pleroma DB is backed up, backing up peerube DB..."
        backup_db peertube_prod
        log "Peertube DB is backed up, compiling all to one and sending to pomoika..."
        #Sending to backup server
        tar cvf - "${backup_dir}" | sudo -iu foxbackup ssh -p2442 foxbackup@42.42.42.2 "cd backup; tar xf -; /home/foxbackup/autobackup.sh"
        #Check md5sum
        echo "[$(date)] Done! All data on pomoika! Starting to check the md5sum..."
        log "Checking opt sum"
        checksum opt.tar
        log "Checking peertube sum"
        checksum peertube.tar
        log "Checking nextcloud sum"
        checksum nextcloud.tar
        log "Checking servers sum"
        checksum servers.tar
        log "Checking mail sum"
        checksum mail.tar
        log "Checking mail_home sum"
        checksum mail_home.tar
        log "Checking synapse sum"
        checksum synapse.dump
        log "Checking nextclouddb sum"
        checksum nextclouddb.dump
        log "Checking pleroma sum"
        checksum pleroma.dump
        log "Checking peertube sum"
        checksum peertube.dump
        echo "Checked the md5sum. See above to errors."
}

startBackup

### to restore
#
#pg_restore -d postgres --clean --create "file backup"