package ids

import (
	"fmt"
	"strings"

	"github.com/monlet/agent/internal/config"
)

func ResolveAgentID(configured, hostname string) (string, error) {
	if configured != "" {
		id := strings.TrimSpace(configured)
		if err := config.ValidateID("agent_id", id); err != nil {
			return "", err
		}
		return id, nil
	}
	id := strings.TrimSpace(hostname)
	if id == "" {
		return "", fmt.Errorf("hostname is empty")
	}
	if err := config.ValidateID("hostname as agent_id", id); err != nil {
		return "", err
	}
	return id, nil
}