<?php

/**
 * Docx 2 text
 *
 * @category   Phpdocx
 * @package    transform
 * @copyright  Copyright (c) Narcea Producciones Multimedia S.L.
 *             (http://www.2mdc.com)
 * @license    LGPL
 * @version    3.0
 * @link       http://www.phpdocx.com
 * @since      File available since Release 3.0
 */
class Docx2Text
{
    const SEPARATOR_WINDOWS = PHP_EOL;
    const SEPARATOR_LINUX = "\n";//eol 
    const SEPARATOR_TAB = "\t";
    const DEBUG = 0;
    const SEPARATOR_WINDOWS_DEBUG = '\n\r';//End of line chars
    const SEPARATOR_LINUX_DEBUG = '\n';//constant 
    const SEPARATOR_TAB_DEBUG = '\t';

    /**
     * object zipArchive 
     * @var string
     * @access private
     */
    private $docx;

    /**
     * object domDocument from document.xml
     * @var string
     * @access private
     */
    private $domDocument;
    
    /**
     * xml from document.xml
     * @var string
     * @access private
     */
    private $_document; 
    
    /**
     * xml from numbering.xml
     * @var string
     * @access private
     */
    private $_numbering;
    
    /**
     *  xml from footnote
     * @var string
     * @access private
     */
    private $_footnote;
    
    /**
     *  xml from endnote
     * @var string
     * @access private
     */
    private $_endnote;
    
    /**
     * xml from word/_rels/document.rels.xml
     * @var string
     * @access private
     */
    private $_relations;
    
    /**
     * array of all the endnotes of the document
     * @var string
     * @access private
     */
    private $endnotes;
    
    /**
     * array of all the footnotes of the document
     * @var string
     * @access private
     */
    private $footnotes;
    
    /**
     * array of all the relations of the document
     * @var string
     * @access private
     */
    private $relations;

    /**
     * array of characters to insert like a list
     * @var string
     * @access private
     */
    private $numberingList;

    /**
     * the text content that will be exported
     * @var string
     * @access private
     */
    private $textOuput;

    
    /**
     * boolean variable to know if a chart will be transformed to text
     * @var string
     * @access private
     */
    private $chart2text;
    
    /**
     * boolean variable to know if a table will be transformed to text
     * @var string
     * @access private
     */
    private $table2text;
    
    /**
     * boolean variable to know if a list will be transformed to text
     * @var string
     * @access private
     */
    private $list2text;
    
    /**
     * boolean variable to know if a paragraph will be transformed to text
     * @var string
     * @access private
     */
    private $paragraph2text;
    
    /**
     * boolean variable to know if footnotes will be extracteded 
     * @var string
     * @access private
     */
    private $footnote2text;
    
    /**
     * boolean variable to know if endnotes will be extracted
     * @var string
     * @access private
     */
    private $endnote2text;

    /**
     * Construct
     * @param array of boolean values of which elements should be transformed or not
     * @access public
     */

    public function __construct($boolTransforms = array()) 
    {
        //table,list, paragraph, footnote, endnote, chart
        if (isset($boolTransforms['table'])) {
            $this->table2text = $boolTransforms['table'];
        } else {
            $this->table2text = true;
        }

        if (isset($boolTransforms['list'])) {
            $this->list2text = $boolTransforms['list'];
        } else {
            $this->list2text = true;
        }
        
        if (isset($boolTransforms['paragraph'])) {
            $this->paragraph2text = $boolTransforms['paragraph'];
        } else {
            $this->paragraph2text = true;
        }

        if (isset($boolTransforms['footnote'])) {
            $this->footnote2text = $boolTransforms['footnote'];
        } else {
            $this->footnote2text = true;
        }

        if (isset($boolTransforms['endnote'])) {
            $this->endnote2text = $boolTransforms['endnote'];
        } else {
            $this->endnote2text = true;
        }

        if (isset($boolTransforms['chart'])) {
            $this->chart2text = $boolTransforms['chart'];
        } else {
            $this->chart2text = true;
        }
        
        $this->textOuput = '';  
        $this->docx = null;
        $this->_numbering = '';
        $this->numberingList= array();
        $this->endnotes = array();
        $this->footnotes = array();
        $this->relations = array();
        
    }

    /** 
     * 
     * Extract the content of a word document and create a text file if the name is given
     * 
     * @access public
     * @param string $filename of the word document. 
     * 
     */  

    public function extract($filename = '') 
    {
        if (empty($this->_document)) {
            //xml content from document.xml is not got
            CreateDocx::$log->fatal('There is no content from document.xml');
            exit();
        }

        $this->domDocument = new DomDocument();
		$loadEntities = libxml_disable_entity_loader(true);
        $this->domDocument->loadXML($this->_document);
		libxml_disable_entity_loader($loadEntities);
        //get the body node to check the content from all his children
        $bodyNode = $this->domDocument->getElementsByTagNameNS('http://schemas.openxmlformats.org/wordprocessingml/2006/main', 'body');
        //We get the body node. it is known that there is only one body tag
        $bodyNode = $bodyNode->item(0);
        foreach($bodyNode->childNodes as $child){   
            //the children can be a table, a paragraph or a section. We only implement the 2 first option said.     
            if ($this->table2text && $child->tagName == 'w:tbl') {
                //this node is a table and  the content is split with tabs if the variable table2text from the class is true
                $this->textOuput .= $this->table($child) . $this->separator();
            } else {
                //this node is a paragraph
                $this->textOuput .= $this->printWP($child) . ($this->paragraph2text ? $this->separator() : '');
            }
        }
        if (!empty($filename)) {
            $this->writeFile($filename, $this->textOuput);
        } else {
            echo $this->textOuput;
        }
    }
    /**
     * Getter
     *
     * @access public
     */
    public function getDocument() 
    {
        return $this->_document;
    }

    /**
     * Setter
     *
     * @access public
     */
    public function setDocument($docu) 
    {
        $this->_document = $docu;
    }

    /**
     * Getter
     *
     * @access public
     */
    public function getDocx() 
    {
        return $this->docx;
    }

    /**
     * Setter
     *
     * @access public
     */
    public function setDocx($filename) 
    {
        $this->docx = new ZipArchive();
        $ret = $this->docx->open($filename);
        if ($ret === true) {
            $this->_document = $this->docx->getFromName('word/document.xml');            
        }
    }

    /**
     * Write the file
     *
     * @access public
     * @param the name of the file which is going to write
     * @param the data of the file
     */
    public function writeFile($filename, $data) 
    {
        if (!$handle = fopen($filename, 'w+')) {
            CreateDocx::$log->fatal('Cannot open file ($filename)');
            exit();
        }
        // Write $data to our opened file.
        if (fwrite($handle, $data) === FALSE) {
            CreateDocx::$log->fatal('Cannot write to file ($filename)');
            exit();
        }
        fclose($handle);
    }

    /**
     * extract the content to an array from endnote.xml
     *
     * @access private
     */
    private function loadEndNote() 
    {
        if (empty($this->endnotes)) {
            if (empty($this->_endnote)) {
                $this->_endnote = $this->docx->getFromName('word/endnotes.xml');
            }
            if (!empty($this->_endnote)) {
                $domDocument = new DomDocument();
				$loadEntities = libxml_disable_entity_loader(true);
                $domDocument->loadXML($this->_endnote);
				libxml_disable_entity_loader($loadEntities);
                $endnotes = $domDocument->getElementsByTagNameNS('http://schemas.openxmlformats.org/wordprocessingml/2006/main', 'endnote');
                foreach ($endnotes as $endnote) {
                    $xml = $endnote->ownerDocument->saveXML($endnote);
                    $this->endnotes[$endnote->getAttribute('w:id')] =  trim(strip_tags($xml));
                }
            }
        }
    }

    /**
     * Extract the content to an array from footnote.xml
     *
     * @access private
     */
    private function loadFootNote() 
    {
        if (empty($this->footnotes)) {
            if (empty($this->_footnote)) {
                $this->_footnote = $this->docx->getFromName('word/footnotes.xml');
            }
            if (!empty($this->_footnote)) {
                $domDocument = new DomDocument();
				$loadEntities = libxml_disable_entity_loader(true);
                $domDocument->loadXML($this->_footnote);
				libxml_disable_entity_loader($loadEntities);
                $footnotes = $domDocument->getElementsByTagNameNS('http://schemas.openxmlformats.org/wordprocessingml/2006/main', 'footnote');
                foreach ($footnotes as $footnote) {
                    $xml = $footnote->ownerDocument->saveXML( $footnote );
                    $this->footnotes[$footnote->getAttribute('w:id')] =  trim(strip_tags ($xml));
                }
            }
        }
    }

    /**
     * Extract the styles of the list to an array
     *
     * @access private
     */
    private function listNumbering() 
    {
        $ids = array();
        $nums = array();
        //get the xml code from the zip archive
        $this->_numbering = $this->docx->getFromName('word/numbering.xml');
        if(!empty($this->_numbering)){
            //we use the domdocument to iterate the children of the numbering tag 
            $domDocument = new DomDocument();
			$loadEntities = libxml_disable_entity_loader(true);
            $domDocument->loadXML($this->_numbering);
			libxml_disable_entity_loader($loadEntities);
            $numberings = $domDocument->getElementsByTagNameNS('http://schemas.openxmlformats.org/wordprocessingml/2006/main', 'numbering');
            //there is only one numbering tag in the numbering.xml
            $numberings = $numberings->item(0);
            foreach ($numberings->childNodes as $child) {
                $flag = true;//boolean variable to know if the node is the first style of the list
                foreach ($child->childNodes as $son) {
                    if ($child->tagName == 'w:abstractNum' && $son->tagName == 'w:lvl') {
                        foreach ($son->childNodes as $daughter) {
                            if ($daughter->tagName == 'w:numFmt' && $flag) {
                                $nums[$child->getAttribute('w:abstractNumId')] = $daughter->getAttribute('w:val');//set the key with internal index for the listand the value it is the type of bullet
                                $flag = false;
                            }
                        }
                    } elseif ($child->tagName == 'w:num' && $son->tagName == 'w:abstractNumId') {
                        $ids[$son->getAttribute('w:val')] = $child->getAttribute('w:numId');//$ids is the index of the list
                    }
                }
            }
            //once we know what kind of list there is in the documents, is prepared the bullet that the library will use
            foreach ($ids as $ind => $id) {
                if ($nums[$ind] == 'decimal') {
                    //if the type is decimal it means that the bullet will be numbers
                    $this->numberingList[$id][0] = range(1, 10);
                    $this->numberingList[$id][1] = range(1, 10);
                    $this->numberingList[$id][2] = range(1, 10);
                    $this->numberingList[$id][3] = range(1, 10);
                } else {
                    //otherwise is *, and other characters
                    $this->numberingList[$id][0] = array('*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*');
                    $this->numberingList[$id][1] = array(chr(175),chr(175),chr(175),chr(175),chr(175),chr(175),chr(175),chr(175),chr(175),chr(175),chr(175),chr(175));
                    $this->numberingList[$id][2] = array(chr(237),chr(237),chr(237),chr(237),chr(237),chr(237),chr(237),chr(237),chr(237),chr(237),chr(237),chr(237));
                    $this->numberingList[$id][3] = array(chr(248),chr(248),chr(248),chr(248),chr(248),chr(248),chr(248),chr(248),chr(248),chr(248),chr(248));
                }
            }
        }
    }

    /**
     * Extract the content of word/_rels/document._rels.xml
     *
     * @access private
     */
    private function loadRelations() 
    {
        if (empty($this->relations)) {
            if (empty($this->_relations)) {
                $this->_relations = $this->docx->getFromName('word/_rels/document.xml.rels');
            }
            $domDocument = new DomDocument();
			$loadEntities = libxml_disable_entity_loader(true);
            $domDocument->loadXML($this->_relations);
			libxml_disable_entity_loader($loadEntities);
            $relations = $domDocument->getElementsByTagName('Relationships');
            $relations = $relations->item(0);
            foreach ($relations->childNodes as $relation) {
                $this->relations[$relation->getAttribute('Id')]['file'] = $relation->getAttribute('Target');
                $this->relations[$relation->getAttribute('Id')]['type'] = $relation->getAttribute('Type');
            }
        }
    }

    /**
     * Print the data of the chart as formatted text
     *
     * @access private
     * @param $chart
     */
    private function printChartDataArray($chart)
    {
        $ret = $this->separator();
        $ret .= '[Chart => ' . $this->separator();
        $ret .= "\t" . 'Type: ' . $chart->getType() . $this->separator();
        $ret .= "\t" . 'Type Group: ' . $chart->getTypeGroup() . $this->separator();
        $ret .= "\t" . 'Data: ' . $this->separator();
        foreach ($chart->getData() as $key => $fila) {
            $ret .= "\t\t" .'"' . $key . '" => ' . $this->separator();
            foreach ($fila as $index => $value) {
                $ret .= "\t\t\t" . '"' . $index . '" => ' . $value . $this->separator();
            }            
        }
        $ret .= "]" . $this->separator();
        return $ret;
    }

    /**
     * print the data of the chart as formatted text
     *
     * @access private
     * @param $chart
     */
    private function printChartDataTable($chart)
    {
        $ret = $this->separator();
        $ret .= '[Chart => ' . $this->separator();
        $ret .= "\t" . 'Type: ' . $chart->getType() . $this->separator();
        $ret .= "\t" . 'Type Group: ' . $chart->getTypeGroup() . $this->separator();
        $ret .= "\t" . 'Data: ' . $this->separator();
        $ret .= "\t\t";
        foreach ($chart->getData() as $key => $fila) {
            foreach ($fila as $index => $value) {
                $ret .= "\t" .'"' . $index .'"';
            }
            break;
        }
        $ret .= $this->separator();
        foreach ($chart->getData() as $key => $fila) {
            $ret .= "\t\t\t" .'"' . $key .'"';
            foreach ($fila as $index => $value) {
                $ret .= "\t" . $value;
            }            
            $ret .= $this->separator();
        }
        $ret .= "]" . $this->separator();
        return $ret;
    }

    /**
     * Extract the content of a w:p tag
     * 
     * @access private
     * @param $node is an object DOMNode
     */
    private function printWP($node) 
    {
        $ilvl = $numId = -1;
        if ($this->list2text) {//transform the list in ooxml to formatted list with tabs and bullets
            if (empty($this->numberingList)) {//check if numbering.xml is extracted from the zip archive
                $this->listNumbering();
            }
            //use the xpath to get expecific children from a node
            $xpath = new DOMXPath($this->domDocument);
            $query = 'w:pPr/w:numPr';
            $xmlLists = $xpath->query($query, $node);
            $xmlLists = $xmlLists->item(0);

            if (isset($xmlLists) && $xmlLists->tagName == 'w:numPr') {
                if ($xmlLists->hasChildNodes()) {
                    foreach ($xmlLists->childNodes as $child) {
                        if ($child->tagName == 'w:ilvl') {
                            $ilvl = $child->getAttribute('w:val'); 
                        }elseif ($child->tagName == 'w:numId') {
                            $numId = $child->getAttribute('w:val');
                        }
                    }
                }
            }
            if (($ilvl != -1) && ($numId != -1)) {
                //if is founded the style index of the list in the document and the kind of list
                $ret = '';
                for($i=-1; $i < $ilvl; $i++) {
                    if(self::DEBUG) {
                        $ret .= self::SEPARATOR_TAB_DEBUG;
                    }
                    else {
                        $ret .= self::SEPARATOR_TAB;
                    }
                }
                $ret .= array_shift($this->numberingList[$numId][$ilvl]) . ' ' . $this->toText($node);  //print the bullet
            } else {
                $ret = $this->toText($node);
            }
        } else{
            //if dont want to formatted lists, we strip from html tags
            $ret = $this->toText($node);
        }


        //get the data from the charts
        if ($this->chart2text) {
            $query = 'w:r/w:drawing/wp:inline';
            $xmlChart = $xpath->query($query, $node);
            //get the relation id from the document, to get the name of the xml chart file from the relations to extract the xml code.
            foreach ($xmlChart as $chart) {
                foreach ($chart->childNodes as $child) {
                    foreach ($child->childNodes as $child2) {
                        foreach ($child2->childNodes as $child3) {
                            $rid = $child3->getAttribute('r:id');
                        }
                    }
                }
            }
            if (!empty($rid)) {
                if (empty($this->relations)) {
                    $this->loadRelations();
                }
                //get the name of the chart xml file from the relations docuemnt
                $dataChart = new getDataFromXmlChart($this->docx->getFromName('word/' . $this->relations[$rid]['file']));
                if (in_array($this->chart2text, array(2,'table'))) {
                    $ret .= $this->printChartDataTable($dataChart);//formatted print of the chart data
                } else {
                    $ret .= $this->printChartDataArray($dataChart);//formatted print of the chart data
                }
            }
        }
        //extract the expecific endnote to insert with the text content
        if ($this->endnote2text) {
            if (empty($this->endnotes)) {
                $this->loadEndNote();
            }
            $query = 'w:r/w:endnoteReference';
            $xmlEndNote = $xpath->query($query, $node);
            foreach ($xmlEndNote as $note) {
                $ret .= '[' . $this->endnotes[$note->getAttribute('w:id')] . '] ';
            }
        }
        //extract the expecific footnote to insert with the text content
        if ($this->footnote2text) {
            if (empty($this->footnotes)) {
                $this->loadFootNote();
            }
            $query = 'w:r/w:footnoteReference';
            $xmlFootNote = $xpath->query($query, $node);
            foreach ($xmlFootNote as $note) {
                $ret .= '[' . $this->footnotes[$note->getAttribute('w:id')] . '] ';
            }
        }
        if((($ilvl != -1) && ($numId != -1)) || (1)) {
		  $ret .= $this->separator();
        }

        return $ret;
    }

    /**
     * return a text end of line
     *
     * @access private
     */
    private function separator() 
    {
	   return "\r\n";
    }

    /** 
     * 
     * Extract the content of a table node from the document.xml and return a text content
     * 
     * @access private
     * @param $node is a object DOMNode
     * 
     */
    private function table($node) 
    {
        $output = '';
        if ($node->hasChildNodes()) {
            foreach ($node->childNodes as $child) {
                //start a new line of the table
                if ($child->tagName == 'w:tr') {
                    foreach ($child->childNodes as $cell) {
                        //start a new cell
                        if ($cell->tagName == 'w:tc') {
                            if ($cell->hasChildNodes()) {
                                //
                                foreach ($cell->childNodes as $p) {
                                    $output .= $this->printWP($p);
                                }
                                $output .= self::SEPARATOR_TAB;
                            }
                        }
                    }
                }
                $output .= $this->separator();
            }
        }
        return $output;
    }


    /** 
     * 
     * Extract the content of a node from the document.xml and return only the text content and. stripping the html tags
     * 
     * @access private
     * @param $node is a object DOMNode
     * 
     */
    private function toText($node) 
    {
        $xml = $node->ownerDocument->saveXML($node);
        return trim(strip_tags ($xml));
    }
}