// Copyright 2011 The Go Authors.  All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

// This package implements a simple XMPP client according to RFCs 3920

// and 3921, plus the various XEPs at http://xmpp.org/protocols/.

package xmpp

import (

	"fmt"

	"net"

	"os"

)

const (

	serverSrv = "xmpp-server"

	clientSrv = "xmpp-client"

)

// The client in a client-server XMPP connection.

type Client struct {

	//In <-chan *Stanza

	//Out chan<- *Stanza

	tcp *net.TCPConn

}

// Connect to the appropriate server and authenticate as the given JID

// with the given password.

func NewClient(jid *JID, password string) (*Client, os.Error) {

	// Resolve the domain in the JID.

	_, srvs, err := net.LookupSRV(clientSrv, "tcp", jid.Domain)

	if err != nil {

		return nil, os.NewError("LookupSrv " + jid.Domain +

			": " + err.String())

	}

	var c *net.TCPConn

	for _, srv := range srvs {

		addrStr := fmt.Sprintf("%s:%d", srv.Target, srv.Port)

		addr, err := net.ResolveTCPAddr("tcp", addrStr)

		if err != nil {

			err = os.NewError(fmt.Sprintf("ResolveTCPAddr(%s): %s",

				addrStr, err.String()))

			continue

		}

		c, err = net.DialTCP("tcp", nil, addr)

		if err != nil {

			err = os.NewError(fmt.Sprintf("DialTCP(%s): %s",

				addr, err.String()))

			continue

		}

	}

	if c == nil {

		return nil, err

	}

	cl := Client{}

	cl.tcp = c

	return &cl, nil

}