#!/bin/bash

do_stop() {
    echo "Shutting down server for scheduled daily backup."
    mcbe-shutdown 10 "Shutting down server for scheduled daily backup."
}

do_start() {
    sleep 5
    echo "Restarting server after backup."
    service mcbe start
}

do_backup() {
    day=$(date +%d)
    cd /vol/data
    mkdir -p worlds-daily-$day/
    rsync -vaSH /home/mcadmin/worlds/ worlds-daily-$day/
    if [[ $day == 1 ]]; then
        month=$(date +%m)
        year=$(date +%Y)
        mkdir -p worlds-$year-$month-$day/
        rsync -vaSH worlds-daily-$day/ worlds-$year-$month-$day/
    fi
}

# Check if server is started
status=$(systemctl show mcbe -p ActiveState --value)
# Check if any players present
players=$(mcbe-exec list | cut -d ' ' -f 3 | cut -d '/' -f 1)
# check when mcbe-backup was last triggered
last=$(date -d "$(systemctl show mcbe-backup.timer -p LastTriggerUSec --value)" +%s)
# get current time
now=$(date +%s)

# if service is not active, do backup immediately and exit
if [[ $status != active ]]; then
    echo "Service is inactive: copying worlds immediately without restarting service."
    do_backup

# if no players are present, do backup immediately and exit
elif [[ $players == 0 ]]; then
    echo "No players detected: running backup immediately."
    do_stop
    do_backup
    do_start

# if 12 or more hours have passed since backup was triggered, go ahead and force a shutdown anyways
elif [[ $(( $now - $last )) -ge 43200 ]]; then
    echo "Backup was triggered more than 12 hours ago: forcing backup now."
    do_stop
    do_backup
    do_start

# otherwise, schedule another attempt in an hour
else
    echo "Players present in server: rescheduling backup to one hour from now."
    systemd-run --on-active=1h $0
fi