#!/bin/bash

DOCKER_UID=1034
DOCKER_GID=100
DT_STAMP=$(date +"%Y-%m-%d_%H:%M:%S")

function update_perms() {
	if [ -d $1 ]; then
		chown $DOCKER_UID:$DOCKER_GID -R $1
	else
		chown $DOCKER_UID:$DOCKER_GID $1
	fi
}

function list_backups() {
	du -h $1
}

function create_backup_dir() {
	for var in "$@"
	do
		if ! [ -d $var ]; then
			mkdir $var
			update_perms $var
		fi
	done
}

function rotate_backups() {
	find $1 -type d -mtime +7 -delete
}

function bookstack() {
	APP_PATH=$1
	CTR_NAME="Bookstack"
	ROOT_CTR_BACKUP_PATH=$APP_PATH/_backups
	CTR_BACKUP_PATH=$ROOT_CTR_BACKUP_PATH/$DT_STAMP
	DB_BACKUP_FILE=$CTR_BACKUP_PATH/bookstack_db.sql
	APP_BACKUP_FILE=$CTR_BACKUP_PATH/bookstack_app.tgz
	
	# Print Container Name
	echo "Backing up $CTR_NAME..."
	
	# Create Backup Paths
	create_backup_dir $ROOT_CTR_BACKUP_PATH $CTR_BACKUP_PATH

	docker exec bookstack_db /usr/bin/mysqldump -u bookstack -p bookstackapp --password=nwb9buaBJX7bxt5pnk > $DB_BACKUP_FILE
	tar -czf $APP_BACKUP_FILE -P $APP_PATH/app_data/www

	# Change Permissions
	update_perms $DB_BACKUP_FILE
	update_perms $APP_BACKUP_FILE
	
	# List Backups
	list_backups $CTR_BACKUP_PATH
	
	# Rotate Backups
	rotate_backups $ROOT_CTR_BACKUP_PATH
	
	# Print end of Backup
	echo "Finished backing up $CTR_NAME"
	echo "-----------------------------"
	echo
}

echo "Docker Backup Script v1.0"
echo

bookstack "/volume1/Docker/bookstack"