package xmpp

import (
	"encoding/xml"
)

// domainpart extracts the domain name from a JID / XMPP address. See
// https://datatracker.ietf.org/doc/html/rfc7622#section-3.2 for details.
func domainpart(jid string) string {
	list := []rune(jid)

	for i, v := range list {
		if v == '/' {
			list = list[:i]
			break
		}
	}

	for i, v := range list {
		if v == '@' {
			list = list[i+1:]
			break
		}
	}

	return string(list)
}

func username(jid string) string {
	list := []rune(jid)

	for i, v := range list {
		if v == '@' {
			return string(list[:i])
		}
	}

	return ""
}

func hasBind(e []xml.Token) bool {
	bind := xml.Name{`urn:ietf:params:xml:ns:xmpp-bind`, `bind`}

	for _, v := range e {
		switch s := v.(type) {
		case xml.StartElement:
			if s.Name == bind {
				return true
			}
		}
	}

	return false
}