#!/bin/env bash

# create user xtrabackup@127.0.0.1 identified by 'cruces';
# grant backup_admin,process,reload,lock tables,replication client,replication slave on *.* to xtrabackup@127.0.0.1;
# flush privilges;


base_dir=/backup
log_file=${base_dir}/xtrabackup.log
defaults_file=/etc/my.cnf
user=root
password
 
=''
port=3306


function reorganize() {
        find $base_dir -maxdepth 1 ! -path $base_dir -mtime +30 -type d -exec rm -rf {} \;
}

function full_backup() {
        backup_dir=${base_dir}/`date +%F`
        mkdir $backup_dir
        xtrabackup --defaults-file=$defaults_file --backup --user=$user --password="
 
$password" --port=$port --target-dir=$backup_dir/base &>> $log_file
        reorganize
}

function incremental_backup() {
        day_of_week=`date +%u`
        echo $day_of_week
        backup_dir=${base_dir}/`date -d 'last monday' +%F`
        echo $backup_dir
        target_dir=${backup_dir}/incremental_$((day_of_week-1
 
))
        echo $target_dir
        if [[ $day_of_week -eq 2 ]];then
                incremental_basedir=${backup_dir}/base
                echo $incremental_basedir
        else
                incremental_basedir=${backup_dir}/incremental_$((day_of_week-2))
                if [ ! -d $incremental_basedir ];then
                        incremental_basedir=${base_dir}/`date -d 'last monday' +%F`/base
                fi
                echo $incremental_basedir
        fi
        
        xtrabackup --defaults-file=$defaults_file --backup --user=$user --password="$password" --port=$port --target-dir=${target_dir} \
--incremental-basedir=${incremental_basedir} &>> $log_file
}

function alternate() {
        full_dir=${base_dir}/`date -d 'last monday' +%F`/base
        if [ ! -d ${full_dir} ];then
                echo -e '\n\n\n\n' >> $log_file
                echo "############################################################################" >> $log_file
                echo `date +"%F %T %u %A %B %j"` A New Round backup begin!!!!!!!!!!>> $log_file
                echo "############################################################################" >> $log_file
                echo "############################################################################" >> $log_file
                echo `date +"%F %T %u %A %B %j"` full backup starting >> $log_file
                echo "############################################################################" >> $log_file
                xtrabackup --defaults-file=$defaults_file --backup --user=$user --password="$pasword" --port=$port --target-dir=$full_dir &>> $log_file
                reorganize
                exit 0
        fi
        
}
                
function main() {
        if [[ `date +%u` -eq 1 ]];then
                echo -e '\n\n\n\n' >> $log_file
                echo "############################################################################" >> $log_file
                echo `date +"%F %T %u %A %B %j"` A New Round backup begin!!!!!!!!!!>> $log_file
                echo "############################################################################" >> $log_file
                echo "############################################################################" >> $log_file
                echo `date +"%F %T %u %A %B %j"` full backup starting >> $log_file
                echo "############################################################################" >> $log_file
                full_backup
        else
                alternate
                echo -e '\n' >> $log_file
                echo "############################################################################" >> $log_file
                echo `date +"%F %T %u %A %B %j"` incremental backup starting >> $log_file
                echo "############################################################################" >> $log_file
                incremental_backup
        fi
}


main