package irc

import (
	"code.google.com/p/go.text/unicode/norm"
	"regexp"
	"strings"
)

var (
	// regexps
	ChannelNameExpr = regexp.MustCompile(`^[&!#+][\pL\pN]{1,63}$`)
	NicknameExpr    = regexp.MustCompile("^[\\pL\\pN\\pP\\pS]{1,32}$")
)

// Names are normalized and canonicalized to remove formatting marks
// and simplify usage. They are things like hostnames and usermasks.
type Name string

func NewName(str string) Name {
	return Name(norm.NFKC.String(str))
}

func NewNames(strs []string) []Name {
	names := make([]Name, len(strs))
	for index, str := range strs {
		names[index] = NewName(str)
	}
	return names
}

// tests

func (name Name) IsChannel() bool {
	return ChannelNameExpr.MatchString(name.String())
}

func (name Name) IsNickname() bool {
	return NicknameExpr.MatchString(name.String())
}

// conversions

func (name Name) String() string {
	return string(name)
}

func (name Name) ToLower() Name {
	return Name(strings.ToLower(name.String()))
}

// It's safe to coerce a Name to Text. Name is a strict subset of Text.
func (name Name) Text() Text {
	return Text(name)
}

// Text is PRIVMSG, NOTICE, or TOPIC data. It's canonicalized UTF8
// data to simplify but keeps all formatting.
type Text string

func NewText(str string) Text {
	return Text(norm.NFC.String(str))
}

func (text Text) String() string {
	return string(text)
}