#! /bin/sh

#
# Do nothing if there is no URLs to proccess
#
if test -z "${BACKUP_DATABASES}"; then
    echo >&2 "missing a list of db urls on \$BACKUP_DATABASES env var"\
    && exit 1;
fi

#
# Create output file if --saved option was set
#
while test $# -gt 0; do
    arg_value="$1";
    shift;
    if test "${arg_value}" = "--save"; then
        output_path=${OFELIA_CONFIG_PATH:-/etc/ofelia/config.ini};
        mkdir $(dirname $output_path);
        touch ${output_path};
    fi
done
if test -z "${output_path}"; then
    output_path=/dev/stdout;
fi

for entry in "${BACKUP_DATABASES}"; do
    # normalize spaces
    backup_data=$(echo ${entry} | xargs);
    # skip if it is a empty line
    if test -z "${backup_data}"; then
        continue;
    fi
    # remove everything after first space to filter URL
    DB_URL=${backup_data%% *};
    # remove everything before the first space to get cron label
    BACKUP_SCHEDULE=${backup_data#* };
    # load url data as variables
    dburl-parser.sh ${DB_URL} > /tmp/ofelia.dotenv;
    source /tmp/ofelia.dotenv;
    rm /tmp/ofelia.dotenv;
    # fail if $DB_URL has no schema
    if test -z "${DB_SCHEMA}"; then
        1>&2 echo "invalid entry in \$BACKUP_DATABASES: ${entry}";
        exit 7;
    fi
    # strip final : and convert schema to lowercase
    schema="$(echo ${DB_SCHEMA%:} | tr '[:upper:]' '[:lower:]')";
    # install schema related tools in advance
    install-${schema}-tools.sh
    # save backup command : should there be one script per database type
    bkp_command="backup-${schema}.sh --url=${DB_URL}";
    # BACKUP_SCHEDULE defaults to @daily
    bkp_schedule="${BACKUP_SCHEDULE:-@daily}";
    # set a title to ofelia job
    bkp_title="backup-${DB_HOST}";
    if test -n "${DB_NAME}"; then
        bkp_title="${bkp_title}-${DB_NAME}";
    fi
    # add a entry to this backup in ofelia config file
    cat >> ${output_path} << HEREDOC
# sending data to ${output_path}
[job-local "${bkp_title}"]
$(if test "${DEBUG}" = "on"; then echo "save-only-on-error = false"; fi)
no-overlap = true
command = ${bkp_command}
schedule = ${bkp_schedule}
HEREDOC
done;