<?php

class Importer {
    private $dir;
    private $manifest_dom;
    
    function __construct() {
    }
    
    function delete_directory($dir) {
        if ($handle = opendir($dir)) {
            $array = array();
            while (false !== ($file = readdir($handle))) {
                if ($file != "." && $file != "..") {
                    if(is_dir($dir.$file)) {
                        if(!@rmdir($dir.$file)) {
                            $this->delete_directory($dir.$file.'/');
                        }
                    } else {
                        @unlink($dir.$file);
                    }
                }
            }
            closedir($handle);
            @rmdir($dir);
        }
    }
    
    function import($file) {
        $tmp_file = $file['tmp_name'];
        $this->dir = $tmp_file."_unzipped/";
        if (is_uploaded_file($tmp_file)) {
            $zip = new ZipArchive;
            $res = $zip->open($tmp_file);
            if ($res === TRUE) {
                $zip->extractTo($this->dir);
                $zip->close();
                $result = $this->readZipContents();
                return $result;
            }
        }
        return false;
    }

    function readZipContents() {
        if ($handle = opendir($this->dir)) {
            $this->setManifestFile();
            if ($this->manifest_dom) {
                $result = $this->readManifestFile();
            }
            /*while (false !== ($f = readdir($handle))) {
                if (!substr_compare($f, ".xml", -4, 4)) {
                    $fc = file_get_contents($this->dir."/".$f);
                    if (!empty($fc)) {
                        $obj_id = $this->readItemXML($fc);
                        if (!$obj_id) {
                            $success = false;
                        }
                    }
                }
            }*/
            //closedir($handle);
            if (is_dir($this->dir)) {
                $this->delete_directory($this->dir);
            }
            return $result;
        }
        return false;
    }

    function setManifestFile() {
        if ($handle = opendir($this->dir)) {
            while (false !== ($f = readdir($handle))) {
                if (!substr_compare($f, ".xml", -4, 4)) {
                    $fc = file_get_contents($this->dir."/".$f);
                    if (!empty($fc)) {
                        $manifest = $this->isManifestFile($fc);
                        if ($manifest) {
                            $this->manifest_dom = $manifest;
                            break;
                        }
                    }
                }
            }
            closedir($handle);
        } 
    }

    function isManifestFile($xml) {
        global $TeKe;
        $dom = new DOMDocument();
        $dom->loadXML($xml);
        $dom->preserveWhiteSpace = false;
        $dom->normalizeDocument();
        $manifest = $dom->getElementsByTagName("manifest");
        if ($manifest->length != 0) {
            return $dom;
        }
        return false;
    }

    function readManifestFile() {
        $success = true;
        $dom = $this->manifest_dom;
        $resources = $dom->getElementsByTagName("resource");
        for ($i=0; $i<$resources->length; $i++) {
            $resource = $resources->item($i);
            $item_href = $resource->getAttribute("href");
            
            $fc = file_get_contents($this->dir."/".$item_href);
            if (!empty($fc)) {
                $obj_id = $this->readItemXML($resource, $fc);
                if (!$obj_id) {
                    $success = false;
                }
            }
        }
        return $success;
    }

    function readItemXML($resource, $xml) {
        global $TeKe;
        $dom = new DOMDocument();
        $dom->loadXML($xml);
        $dom->preserveWhiteSpace = false;
        $dom->normalizeDocument();
        $assessmentItem = $dom->getElementsByTagName("assessmentItem");
        //var_dump($assessmentItem->length);
        if ($assessmentItem->length != 0) {
            $choiceInteraction = $assessmentItem->item(0)->getElementsByTagName("choiceInteraction");
            if ($choiceInteraction->length != 0) {
                return $this->importChoiceInteraction($resource, $dom);
            }
        }
        return true;
    }

    function importChoiceInteraction($resource, $dom) {
        global $TeKe;
        $responseDeclaration = $dom->getElementsByTagName("responseDeclaration");
        $cardinality = $responseDeclaration->item(0)->getAttribute("cardinality");
        if ($cardinality == "single") {
            $obj = $TeKe->plugin->loadType("multipleChoice");
            $obj_id = $obj->buildFromXML($resource, $dom);
            return $obj_id;
        } else if ($cardinality == "multiple") {
            $obj = $TeKe->plugin->loadType("multipleResponse");
            $obj_id = $obj->buildFromXML($resource, $dom);
            return $obj_id;
        }
        return false;
    }
    
}
?>