package hostname

import (
	"fmt"
	"strings"
)

// for www.corp.wit.com retuns:
// "www", "corp.wit.com", nil
func GetDomainname() (string, string, error) {
	hname, err := osGetHostname()
	if err != nil {
		return hname, "", err
	}
	hname = strings.TrimSpace(hname)
	hname = strings.Trim(hname, ".")
	parts := strings.Split(hname, ".")
	if len(parts) == 0 {
		return "", "", fmt.Errorf("domainname not set")
	}

	if len(parts) == 1 {
		return parts[0], "", fmt.Errorf("domainname not set")
	}

	dname := strings.Join(parts[1:], ".")

	return hname, dname, nil
}

// splits hostname into first and last part
// for www.corp.wit.com retuns:
// "www", "corp.wit.com", nil
func Split(hname string) (string, string, error) {
	hname = strings.TrimSpace(hname)
	hname = strings.Trim(hname, ".")
	parts := strings.Split(hname, ".")
	if len(parts) == 0 {
		return "", "", fmt.Errorf("domainname not set")
	}

	if len(parts) == 1 {
		return parts[0], "", fmt.Errorf("domainname not set")
	}

	dname := strings.Join(parts[1:], ".")

	return hname, dname, nil
}

func Join(hname string, dname string) string {
	hname = strings.TrimSpace(hname)
	hname = strings.Trim(hname, ".")
	dname = strings.TrimSpace(dname)
	dname = strings.Trim(dname, ".")

	fullname := strings.Join([]string{hname, dname}, ".")
	fullname = strings.TrimSpace(fullname)
	fullname = strings.Trim(fullname, ".")

	return fullname
}