<?php
//
// DokuWiki AJAX call handler
//
// @license    Public domain
// @author     MARTINEAU Emeric
//

//fix for Opera XMLHttpRequests
if(!count($_POST) && isset($HTTP_RAW_POST_DATA)) {
    parse_str($HTTP_RAW_POST_DATA, $_POST) ;
}

if(!defined('DOKU_INC')) {
    define('DOKU_INC',realpath(dirname(__FILE__).'/../../../').'/') ;
}

require_once(DOKU_INC.'inc/init.php') ;
require_once(DOKU_INC.'inc/common.php') ;
require_once(DOKU_INC.'inc/auth.php') ;
require_once(DOKU_INC.'inc/html.php') ;

define(SHOW_GRAVATAR, false) ;
define(BASE_URL, preg_replace('!(.+)(/.+){3}!', '\\1/', DOKU_BASE)) ;

session_write_close();

require_once('config.php') ;

//
// Get user name
//
// @return user name
//
function getUser() {
    if (isset($_GET['user'])) {
        $user = $_GET['user'] ;
    } else {
        $user = '' ;
    }
    
    $user = preg_replace('/[^ .,a-z0-9_\-]/i', '', $user) ;
    $user = substr($user, 0, 40) ;
    
    return $user ;
}

//
// Get page Id
//
// @return page id
//
function getPageId() {
    if (isset($_GET['pageId'])) {
        $pageId = $_GET['pageId'] ;
    } else {
        $pageId = '' ;
    }
    
    return cleanID($pageId) ;
}

//
// Get massage
//
// @return page id
//
function getMessage() {
    global $DOKUWIKI_TWEET_CONFIG ;
    
    if (isset($_GET['msg'])) {
        $msg = str_replace(array("\n", "\r"), ' ', $_GET['msg']) ;
        /*
    $fd = fopen('data.txt', 'w') ;
    
    if ($fd) {
        fwrite($fd, $msg) ;
        fclose($fd) ;
    }*/        
        $msg = substr($msg, 0, $DOKUWIKI_TWEET_CONFIG['msg_maximum_size']) ;
    } else {
        $msg = '' ;
    }
    
    $msg = urlencode($msg) ;
        
    return $msg ;
}

//
// Save message in wiki
//
function saveMessage() {
    global $conf ;
    global $auth ;
    global $lang ;
    global $DOKUWIKI_TWEET_CONFIG ;
    
    $pageId = getPageId() ;
    
    // TODO but how ?
    //if ($conf['useacl'] && auth_quickaclcheck($pageId) < AUTH_EDIT) {
	    while (checklock($pageId)) {
	        sleep(50) ;
        }
        
	    lock($pageId) ;

        $pageFileName = wikiFN($pageId) ;
        $fileContent = @file($pageFileName) ; 
        
        $lineCount = count($fileContent) ;
        
        $start = -1 ;
        
        $tagOpen = '<' . $DOKUWIKI_TWEET_CONFIG['tag'] . '>' ;
        $tagClose = '</' . $DOKUWIKI_TWEET_CONFIG['tag'] . '>' ;

        // Search tag
        for($index = 0; $index < $lineCount; $index++) {
            $pos = strpos($fileContent[$index], $tagOpen) ;
            
            if ($pos !== false) {
                $start = $index ;
            }
        }
        
        // Found ?
        if ($start > -1) {
            $line = time() . $DOKUWIKI_TWEET_CONFIG['separator'] . getUser() . $DOKUWIKI_TWEET_CONFIG['separator'] . getMessage() ;
            
            $fileContent[$start] = str_replace($tagOpen,
                $tagOpen . $line . "\n", $fileContent[$start]) ;

            $nbMsg = $DOKUWIKI_TWEET_CONFIG['max_msg'] ;

            // If -1 no delete
            if ($nbMsg > -1) {
                // Clear line    
                for($index = $start + 1; $index < $lineCount; ) {
                    $pos = strpos($fileContent[$index], $tagClose) ;

                    if ($pos !== false) {
                        break ;
                    } 
                    
                    $nbMsg-- ;
                    
                    if ($nbMsg < 1) {
                        array_splice($fileContent, $index, 1) ;

                        $lineCount-- ;
                    } else {
                        $index++ ;
                    }
                }
            }
            
            $fileContent = implode('', $fileContent) ;

            saveWikiText($pageId, $fileContent, "Message added", true) ;

            unlock($pageId) ;
        }
    //}
}

if (isset($_GET['action'])) {
    $action = $_GET['action'] ;
    
    if ($action == 'save') {
        saveMessage() ;
    }
}
?>