#!/bin/bash

set -eux
cd "$(dirname "$0")"


#$1 should be the app path (ghost,nextcloud,gitea)
#$2 should be the domain to backup

if [ -z "$1" ]; then
    echo "ERROR: the app path was not specified."
    exit 1
fi

# TODO: We are using extra space on the remote VPS at the moment for the duplicity backup files.
# we could eliminate that and simply save duplicity backups to the management machine running the script
# this could be done by using a local path and mounting it on the remote VPS.
# maybe something like https://superuser.com/questions/616182/how-to-mount-local-directory-to-remote-like-sshfs

REMOTE_BACKUP_PATH="$REMOTE_HOME/backups/www/$DOCKER_STACK_SUFFIX-$LANGUAGE_CODE"
REMOTE_BACKUP_LOCATION="$REMOTE_BACKUP_PATH/$1/$DOMAIN_NAME"

# step 1: run duplicity on the remote system to backup all files to the remote system.
# --allow-source-mismatch
ssh "$PRIMARY_WWW_FQDN" sudo PASSPHRASE="$DUPLICITY_BACKUP_PASSPHRASE" duplicity "$REMOTE_HOME/$1/$DOMAIN_NAME" "file://$REMOTE_BACKUP_LOCATION"
ssh "$PRIMARY_WWW_FQDN" sudo chown -R ubuntu:ubuntu "$REMOTE_BACKUP_LOCATION"


SSHFS_PATH="/tmp/sshfs_temp"
mkdir -p "$SSHFS_PATH"

# now let's pull down the latest files from the backup directory.
# create a temp directory to serve as the mountpoint for the remote machine backups directory
sshfs "$PRIMARY_WWW_FQDN:$REMOTE_BACKUP_LOCATION" "$SSHFS_PATH"

# ensure our local backup path exists so we can pull down the duplicity archive to the management machine.
LOCAL_BACKUP_PATH="$SITE_PATH/backups/www/$BACKUP_TIMESTAMP"
if [ "$1" = letsencrypt ]; then
    LOCAL_BACKUP_PATH="$SITE_PATH/backups/www/letsencrypt"
fi

if [ ! -d "$LOCAL_BACKUP_PATH" ]; then
    mkdir -p "$LOCAL_BACKUP_PATH"
fi

# rsync the files from the remote server to our local backup path.
rsync -av "$SSHFS_PATH/" "$LOCAL_BACKUP_PATH/"

# step 4: unmount the SSHFS filesystem and cleanup.
umount "$SSHFS_PATH"
rm -rf "$SSHFS_PATH"