#!/bin/bash
##########################
##      Configure       ##
##########################
LOCALDIR=
DATABASE_PASSWORD=
DATABASE_USER=
DATABASES=(

)
HISTORY=3

###########################
##        Main           ##
###########################

log() {
    echo -e "$(date "+%Y-%m-%d %T")" "$1" >> ${LOCALDIR}${DATE}.log
}

export PGPASSWORD=${DATABASE_PASSWORD}

DATE=$(date +%Y-%m-%d)
DATETIME=$(date +%Y-%m-%d_%H-%M)
DELETEDATE=$(date --date "-$HISTORY DAY" +%Y-%m-%d)
TEMPDIR=$(mktemp -d)/

log "backup start"

if [ ! -d "${LOCALDIR}" ]; then
    mkdir -p ${LOCALDIR}
fi
if [ ! -d "${TEMPDIR}" ]; then
    mkdir -p ${TEMPDIR}
fi

for database in ${DATABASES[@]}; do
    pg_dump -U postgres -d ${database} -f ${TEMPDIR}${DATETIME}_${database}.sql
    if [ $? -ne 0 ]; then
        log "databases ${database} backup failed"
        exit 1
    fi
    log "backup database ${database}"
done

tar -zcf ${LOCALDIR}${DATETIME}.tar.gz -C ${TEMPDIR} . --exclude .sql
rm -rf ${TEMPDIR}
rm -f ${LOCALDIR}${DELETEDATE}*.tar.gz
rm -f ${LOCALDIR}${DELETEDATE}.log
log "backup finish"