#!/bin/bash
LOG_PATH="$HOME/log"
LOG_FILENAME="dumplog.log"

BACKUP_PATH="/media/testdb/dump"
BACKUP_TOTALPATH="$BACKUP_PATH/$1"
BACKUP_FILENAME=$1

MYSQL_USER="admin"
MYSQL_PASSWORD="admin123"

DATABASE_GROUPONE=(1 7 13 19 25)
DATABASE_GROUPTWO=(3 9 15 21 27)
DATABASE_GROUPTHREE=(5 11 17 23 29)

DATABASE_ONENAME="CTBBG1"
DATABASE_TWONAME="CTBBG2"
DATABASE_THREENAME="CTBBG3"

DAYOFMONTH=$(date +"%e")
IFS=$'\012'
# Log
insertlogger()
{
    logger "$0 : $1" && echo "$0 : $1" 1>&2
}

insertlog()
{
    if [ ! -d $LOG_PATH ];then
        if ! mkdir $LOG_PATH; then
            insertlogger "Fail to make log folder"
            return 1
        fi
    fi

    if [ ! -f "$LOG_PATH/$LOG_FILENAME" ]; then
        if ! touch "$LOG_PATH/$LOG_FILENAME"; then
            insertlogger "Fail to create logfile"
            return 1
        fi
    fi

    if [ ! -w "$LOG_PATH/$LOG_FILENAME" ]; then
        insertlogger "Permission denied to log file"
        return 1
    fi

    messages="["$(date +"%F %H:%M:%S")"] $0".$$" : $1"
    echo "$messages" >> "$LOG_PATH/$LOG_FILENAME" || insertlogger $messages

    return 0
}
insertlog "Start to extract dumpfile"


# Check parameter 1
# If parameter 1 is empty, check BACKUP_PATH and recent dump file will be extracted

if [ -z "$1" ]; then
        if ! ls -t "$BACKUP_PATH/"*".dump.sql"; then
                insertlog "Fail to find dumpfile in $BACKUP_PATH"
                exit 1
        fi

        filenamelist=$(ls -t "$BACKUP_PATH/"*".dump.sql")
        for i in ${filenamelist[@]}; do
                BACKUP_TOTALPATH=$i
                break
        done
fi

insertlog "$BACKUP_TOTALPATH"


# Check form of dump file is valid and extract the day when the dumpfile is created

rx="/[0-9]{4}_[0-9]{2}_([0-9]{2})\w*\.dump\.sql"

day=
if [[ $BACKUP_TOTALPATH =~ $rx  ]]; then
        day=${BASH_REMATCH[1]}
fi


if [ -z "$day" ]; then
        insertlog "Check dumpfile name YYYY_MM_DD.dump.sql or YYYY_MM_DD_N.dump.sql"
        insertlog "Fail to dump file"
        exit 1
fi

databasename=
previousname=
# Determine where to import the dumpfile

for i in ${DATABASE_GROUPONE[@]}; do
        if [ $i -eq $day ]; then
                databasename=$DATABASE_ONENAME
                previousname=$DATABASE_TWONAME
        fi
done

for i in ${DATABASE_GROUPTWO[@]}; do
        if [ $i -eq $day ]; then
                databasename=$DATABASE_TWONAME
                previousname=$DATABASE_THREENAME
        fi
done

for i in ${DATABASE_GROUPTHREE[@]}; do
        if [ $i -eq $day ]; then
                databasename=$DATABASE_THREENAME
                previousname=$DATABASE_ONENAME
        fi
done

# If today is not dump day, extracting dump is canceled

if [ -z "$databasename" ]; then
        insertlog "Today is not dump day"
        insertlog "Extracting dump is canceled"
        exit 1
fi

#echo "databasename = $databasename"
#echo "previousname = $previousname"

# Remove all tables in the oldest backup DB

insertlog "Start to delete $previousname tables"

showtables=$(mysql -u"$MYSQL_USER" -p"$MYSQL_PASSWORD" $previousname -e "show tables")

rxtable="(\w+)"
tablelist=( )
count=0
if [ ! -z "$showtables" ]; then
        for i in ${showtables[@]}; do
                if [[ $i =~ $rxtable ]]; then
                        tablelist[$((count))]=${BASH_REMATCH[1]}
                        count=$((count+1))
                fi
        done
fi

for((i=1;i<count;i++)); do
#       echo ${tablelist[$((i))]}
        if ! mysql -u"$MYSQL_USER" -p"$MYSQL_PASSWORD" $previousname -e "drop table ${tablelist[$((i))]}"; then
                insertlog "Removing $previousname ${tablelist[$((count))]} is failed"
        else
                insertlog "Success to remove $previousname ${tablelist[$((i))]}"
        fi
done

# Start to import dump

insertlog "Start to extract dump - $BACKUP_TOTALPATH to $databasename"

if ! mysql -u"$MYSQL_USER" -p"$MYSQL_PASSWORD" $databasename < "$BACKUP_TOTALPATH"; then
        insertlog "Fail to extract dump - $BACKUP_TOTALPATH"
        exit 1
fi

insertlog "Success to extract dump - $BACKUP_TOTALPATH"
insertlog "Success to extract dumpfile"
exit