<?php

header('Content-type: text/xml');

$usePublicTwitter = true;

if ( isset( $_REQUEST["u"] ) ){
	$username = $_REQUEST["u"];
}
else {
	$username = "twitter-username";
	$password = "twitter-password";
}


$magicChars = "(PKL)";
$pretty = true;
$maxEntries = 10;


// build the url that are reading for
global $twitterUrl;

if ( $usePublicTwitter ) {
	$xmlAsString = getPublicTwitter($username);
}
else {
	$xmlAsString  = getTwitterFriendsXml( $username, $password );
}


// this is for reading friends based on login
if ( $xmlAsString == "" || $xmlAsString == null || !isset($xmlAsString) ) {
	sendError( "no xml returned for $twitterUrl" );
}

$rssDoc = new DOMDocument();
$rssDoc->loadXML( $xmlAsString );


if ( $rssDoc == null ) {
	sendError( "no rss doc was parssed." );
}

$rssRoot = findFirstChild( $rssDoc, "statuses" );

// start output document
$outDoc = new DOMDocument();
$outRoot =  $outDoc->createElement("msgs");
$outDoc->appendChild( $outRoot );


$commentElement  = $outDoc->createComment("url: " . $twitterUrl );
$outRoot->appendChild( $commentElement );

// read the first N entries
$rssItem = findFirstChild( $rssRoot, "status" );

if (!$rssItem) {
	sendError( "found no status." );
}


while ( $maxEntries > 0 && $rssItem ) {
	
	
	$rssEntryTitle = findFirstChild( $rssItem, "text" );
	

	if ( !$rssEntryTitle ) {
		sendError( "found no text" );
	}
	
	$comment = GetContentAsString( $rssEntryTitle );
	
	$rssUser =  findFirstChild( $rssItem, "user" );
	$rssUserName =  findFirstChild( $rssUser, "screen_name" );
	$name = GetContentAsString( $rssUserName );
	$rssIcon = findFirstChild( $rssUser, "profile_image_url" );
	$iconUrl = GetContentAsString( $rssIcon );
	
	// check the comment for the magic chars, if they are there, then
	// strip it, and get the username from the comment
	
	if ( strpos( $comment, $magicChars ) === 0 ) {
		// remove $magicChars
		

		$comment = substr( $comment, strlen($magicChars) );

		$commaIndex = strpos( $comment, "," );
		$name = substr( $comment, 0, $commaIndex );
		
		$comment = substr( $comment, $commaIndex+1 );
	}
	

	$outMessageElement = addTextChild($outDoc, $outRoot, "m", null );
	
	addTextChild( $outDoc,$outMessageElement, "n", $name );
	addTextChild( $outDoc,$outMessageElement, "i", $iconUrl );
	addTextChild( $outDoc,$outMessageElement, "t", $comment );
	
	// get the id
	$rssEntryId = findFirstChild( $rssItem, "id" );
	$idText = GetContentAsString( $rssEntryId );
	
	addTextChild( $outDoc,$outMessageElement, "g", $idText );
	
	
	// get next	
	$rssItem = findNextSib( $rssItem, "status" );
	$maxEntries--;
}

// output the new feed
echo $outDoc->saveXML();

function addTextChild( $doc, $parentTag, $tagName, $text ) {
	$child = $doc->createElement( $tagName );
	$parentTag->appendChild( $child );
	
	if ( $text != null ) {
		$textNode = $doc->createTextNode( $text );
		$child->appendChild( $textNode );
	}
	
	return $child;
}

function getPublicTwitter( $username ) {

	global $twitterUrl;

	$url = "http://twitter.com/statuses/friends_timeline/".$username.".xml";

	$httpDate = gmdate("D, d M Y H:i:s", getlastmod()) . " GMT";
	$url .= "?&cb=" . time() . "&since=" . urlencode( $httpDate ); 

	$twitterUrl = $url;

	$ch = curl_init();
	
	//curl_setopt($ch, CURLOPT_VERBOSE, true );
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true );
	curl_setopt($ch, CURLOPT_UNRESTRICTED_AUTH, true );
	
	curl_setopt($ch, CURLOPT_URL, $url  );
	curl_setopt($ch, CURLOPT_HEADER, 0 );
	curl_setopt($ch, CURLOPT_TIMECONDITION, URL_TIMECOND_IFMODSINCE  );
	
	$xml = curl_exec($ch);
	curl_close($ch);
	
	return $xml;

}

function getTwitterFriendsXml($username, $password) {
	$ch = curl_init();
	
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true );
	curl_setopt($ch, CURLOPT_UNRESTRICTED_AUTH, true );
	
	$user = $username .  ":" . $password;
	
	curl_setopt($ch, CURLOPT_USERPWD, $user );
	curl_setopt($ch, CURLOPT_URL, "http://twitter.com/statuses/friends_timeline.xml" );
	
	$xml = curl_exec($ch);
	curl_close($ch);
	
	return $xml;
}

function debug( $msg ) {
}


function sendError( $msg ) {
	echo $msg;
	die();
}

function findNextSib( $element, $tagName ) {

	$child = $element->nextSibling;

	while ( $child  ) {
		if ( $child->nodeName == $tagName ) {
			return $child;
		}
		$child = $child->nextSibling;
	}
	
	return null;
}

function findFirstChild( $element, $tagName ) {

	$child = $element->firstChild;
	
	
	while ( $child  ) {
	
		if ( $child->nodeName == $tagName ) {
			return $child;
		}
		$child = $child->nextSibling;
	}
	
	return null;

}

function GetContentAsString($node) {   

	return $node->textContent;
}


function findUserProfileIcon($username) {
	
}


?>