#!/bin/bash
set -e
set -u

function create_database() {
    local database=$1
    echo "Creating database '$database'"
    psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" <<-EOSQL
        SELECT 1 FROM pg_database WHERE datname = '$database';
        DO \$\$
        BEGIN
            IF NOT EXISTS (SELECT 1 FROM pg_database WHERE datname = '$database') THEN
                CREATE DATABASE $database;
            END IF;
        END
        \$\$;
        GRANT ALL PRIVILEGES ON DATABASE $database TO $POSTGRES_USER;
EOSQL
}

if [ -n "$POSTGRES_MULTIPLE_DATABASES" ]; then
    echo "Multiple database creation requested: $POSTGRES_MULTIPLE_DATABASES"
    for db in $(echo "$POSTGRES_MULTIPLE_DATABASES" | tr ',' ' '); do
        create_database "$db"
    done
    echo "Multiple databases created"
fi