#! /bin/bash

BACKUP_DIR=/home/minecraft/minecraft/minecraft.backup

#######

DOW=`date +%u`
H=`date +%H`
M=`date +%M`
if [[ $M < 30 ]]; then
    M=00
else
    M=30
fi

## remove 
YESTERDAY=`date -d "yesterday" +%Y.%m.%d`
if [[ $M == 30 ]]; then
#    echo "Removing ${YESTERDAY}_$H.$M"
    rm -rf "$BACKUP_DIR/${YESTERDAY}_$H.$M"*
else
    if [[ $H != 00 && $H != 06 && $H != 12 && $H != 18 ]]; then
#        echo "Removing ${YESTERDAY}_$H.$M"
        rm -rf "$BACKUP_DIR/${YESTERDAY}_$H.$M"*
    fi
fi

LAST_WEEK=`date -d "last week" +%Y.%m.%d`
for hour in 06 12 18; do
#    echo "Removing ${LAST_WEEK}_$hour.00"
    rm -rf "$BACKUP_DIR/${LAST_WEEK}_$hour.00"*
done

LAST_MONTH=`date -d "4 weeks ago" +%Y.%m.%d`
if [[ $DOW != 5 ]]; then
#    echo "Removing ${LAST_MONTH}_00.00"
    rm -rf "$BACKUP_DIR/${LAST_MONTH}_00.00"*
fi