##
## @brief     Helper function to show an error when a password is empty and exit
## param $1   Input name
##
empty_password_error() {
  error "The $1 environment variable is empty or not set. Set the environment variable ALLOW_EMPTY_PASSWORD=yes to allow the container to be started with blank passwords. This is recommended only for development."
  exit 1
}

##
## @brief     Helper function to show a warning when the ALLOW_EMPTY_PASSWORD flag is enabled
##
empty_password_enabled_warn() {
  warn "You set the environment variable ALLOW_EMPTY_PASSWORD=${ALLOW_EMPTY_PASSWORD}. For safety reasons, do not use this flag in a production environment."
}

##
## @brief     Helper function to check deprecated environment variables and warn about them
## param $1   Deprecated environment variable to check
## param $2   Suggested environment variable to use
##
check_for_deprecated_env() {
  if [[ -n "${!1}" ]]; then
    warn "The environment variable $1 is deprecated and will be removed in a future. Please use $2 instead"
  fi
}

# Check env vars to deprecate
check_for_deprecated_env "MYSQL_MASTER_USER" "MYSQL_MASTER_ROOT_USER"
export MYSQL_MASTER_ROOT_USER=${MYSQL_MASTER_USER:-${MYSQL_MASTER_ROOT_USER}}
check_for_deprecated_env "MYSQL_MASTER_PASSWORD" "MYSQL_MASTER_ROOT_PASSWORD"
export MYSQL_MASTER_ROOT_PASSWORD=${MYSQL_MASTER_PASSWORD:-${MYSQL_MASTER_ROOT_PASSWORD}}

# Validate passwords
if [[ "$ALLOW_EMPTY_PASSWORD" =~ ^(yes|Yes|YES)$ ]]; then
    empty_password_enabled_warn
elif [[ "$MYSQL_REPLICATION_MODE" != "slave" ]]; then
    # Root user
    if [[ -z "$MYSQL_ROOT_PASSWORD" ]]; then
        empty_password_error MYSQL_ROOT_PASSWORD
    fi
    # Replication user
    if [[ -n "$MYSQL_REPLICATION_USER" && -z "$MYSQL_REPLICATION_PASSWORD" ]]; then
        empty_password_error MYSQL_REPLICATION_PASSWORD
    fi
    # Additional user creation
    if [[ -n "$MYSQL_USER" && -z "$MYSQL_PASSWORD" ]]; then
        empty_password_error MYSQL_PASSWORD
    fi
fi