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<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2013 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Reader
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    ##VERSION##, ##DATE##
 */


/** PHPExcel root directory */
if (!defined('PHPEXCEL_ROOT')) {
        /**
         * @ignore
         */
        define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../../');
        require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');
}

/**
 * PHPExcel_Reader_HTML
 *
 * @category   PHPExcel
 * @package    PHPExcel_Reader
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Reader_HTML extends PHPExcel_Reader_Abstract implements PHPExcel_Reader_IReader
{
        /**
         * Input encoding
         *
         * @var string
         */
        private $_inputEncoding = 'ANSI';

        /**
         * Sheet index to read
         *
         * @var int
         */
        private $_sheetIndex    = 0;

        /**
         * Formats
         *
         * @var array
         */
        private $_formats = array( 'h1' => array( 'font' => array( 'bold' => true,
                                                                                                                           'size' => 24,
                                                                                                                         ),
                                                                                        ),      //      Bold, 24pt
                                                           'h2' => array( 'font' => array( 'bold' => true,
                                                                                                                           'size' => 18,
                                                                                                                         ),
                                                                                        ),      //      Bold, 18pt
                                                           'h3' => array( 'font' => array( 'bold' => true,
                                                                                                                           'size' => 13.5,
                                                                                                                         ),
                                                                                        ),      //      Bold, 13.5pt
                                                           'h4' => array( 'font' => array( 'bold' => true,
                                                                                                                           'size' => 12,
                                                                                                                         ),
                                                                                        ),      //      Bold, 12pt
                                                           'h5' => array( 'font' => array( 'bold' => true,
                                                                                                                           'size' => 10,
                                                                                                                         ),
                                                                                        ),      //      Bold, 10pt
                                                           'h6' => array( 'font' => array( 'bold' => true,
                                                                                                                           'size' => 7.5,
                                                                                                                         ),
                                                                                        ),      //      Bold, 7.5pt
                                                           'a'  => array( 'font' => array( 'underline' => true,
                                                                                                                           'color' => array( 'argb' => PHPExcel_Style_Color::COLOR_BLUE,
                                                                                                                                           ),
                                                                                                                         ),
                                                                                        ),      //      Blue underlined
                                                           'hr' => array( 'borders' => array( 'bottom' => array( 'style' => PHPExcel_Style_Border::BORDER_THIN,
                                                                                                                                                                         'color' => array( PHPExcel_Style_Color::COLOR_BLACK,
                                                                                                                                                                                         ),
                                                                                                                                                                   ),
                                                                                                                                ),
                                                                                        ),      //      Bottom border
                                                         );


        /**
         * Create a new PHPExcel_Reader_HTML
         */
        public function __construct() {
                $this->_readFilter      = new PHPExcel_Reader_DefaultReadFilter();
        }

        /**
         * Validate that the current file is an HTML file
         *
         * @return boolean
         */
        protected function _isValidFormat()
        {
                //      Reading 2048 bytes should be enough to validate that the format is HTML
                $data = fread($this->_fileHandle, 2048);
                if ((strpos('<',$data) !== FALSE) &&
                        (strlen($data) !== strlen(strip_tags($data)))) {
                        return TRUE;
                }

                return FALSE;
        }

        /**
         * Loads PHPExcel from file
         *
         * @param       string          $pFilename
         * @return      PHPExcel
         * @throws      PHPExcel_Reader_Exception
         */
        public function load($pFilename)
        {
                // Create new PHPExcel
                $objPHPExcel = new PHPExcel();

                // Load into this instance
                return $this->loadIntoExisting($pFilename, $objPHPExcel);
        }

        /**
         * Set input encoding
         *
         * @param string $pValue Input encoding
         */
        public function setInputEncoding($pValue = 'ANSI')
        {
                $this->_inputEncoding = $pValue;
                return $this;
        }

        /**
         * Get input encoding
         *
         * @return string
         */
        public function getInputEncoding()
        {
                return $this->_inputEncoding;
        }

        //      Data Array used for testing only, should write to PHPExcel object on completion of tests
        private $_dataArray = array();

        private $_tableLevel = 0;
        private $_nestedColumn = array('A');

        private function _setTableStartColumn($column) {
                if ($this->_tableLevel == 0)
                        $column = 'A';
                ++$this->_tableLevel;
                $this->_nestedColumn[$this->_tableLevel] = $column;

                return $this->_nestedColumn[$this->_tableLevel];
        }

        private function _getTableStartColumn() {
                return $this->_nestedColumn[$this->_tableLevel];
        }

        private function _releaseTableStartColumn() {
                --$this->_tableLevel;
                return array_pop($this->_nestedColumn);
        }

        private function _flushCell($sheet,$column,$row,&$cellContent) {
                if (is_string($cellContent)) {
                        //      Simple String content
                        if (trim($cellContent) > '') {
                                //      Only actually write it if there's content in the string
//                              echo 'FLUSH CELL: ' , $column , $row , ' => ' , $cellContent , '<br />';
                                //      Write to worksheet to be done here...
                                //      ... we return the cell so we can mess about with styles more easily
                                $cell = $sheet->setCellValue($column.$row,$cellContent,true);
                                $this->_dataArray[$row][$column] = $cellContent;
                        }
                } else {
                        //      We have a Rich Text run
                        //      TODO
                        $this->_dataArray[$row][$column] = 'RICH TEXT: ' . $cellContent;
                }
                $cellContent = (string) '';
        }

        private function _processDomElement(DOMNode $element, $sheet, &$row, &$column, &$cellContent){
                foreach($element->childNodes as $child){
                        if ($child instanceof DOMText) {
                                $domText = preg_replace('/\s+/',' ',trim($child->nodeValue));
                                if (is_string($cellContent)) {
                                        //      simply append the text if the cell content is a plain text string
                                        $cellContent .= $domText;
                                } else {
                                        //      but if we have a rich text run instead, we need to append it correctly
                                        //      TODO
                                }
                        } elseif($child instanceof DOMElement) {
//                              echo '<b>DOM ELEMENT: </b>' , strtoupper($child->nodeName) , '<br />';

                                $attributeArray = array();
                                foreach($child->attributes as $attribute) {
//                                      echo '<b>ATTRIBUTE: </b>' , $attribute->name , ' => ' , $attribute->value , '<br />';
                                        $attributeArray[$attribute->name] = $attribute->value;
                                }

                                switch($child->nodeName) {
                                        case 'meta' :
                                                foreach($attributeArray as $attributeName => $attributeValue) {
                                                        switch($attributeName) {
                                                                case 'content':
                                                                        //      TODO
                                                                        //      Extract character set, so we can convert to UTF-8 if required
                                                                        break;
                                                        }
                                                }
                                                $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
                                                break;
                                        case 'title' :
                                                $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
                                                $sheet->setTitle($cellContent);
                                                $cellContent = '';
                                                break;
                                        case 'span'  :
                                        case 'div'   :
                                        case 'font'  :
                                        case 'i'     :
                                        case 'em'    :
                                        case 'strong':
                                        case 'b'     :
//                                              echo 'STYLING, SPAN OR DIV<br />';
                                                if ($cellContent > '')
                                                        $cellContent .= ' ';
                                                $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
                                                if ($cellContent > '')
                                                        $cellContent .= ' ';
//                                              echo 'END OF STYLING, SPAN OR DIV<br />';
                                                break;
                                        case 'hr' :
                                                $this->_flushCell($sheet,$column,$row,$cellContent);
                                                ++$row;
                                                if (isset($this->_formats[$child->nodeName])) {
                                                        $sheet->getStyle($column.$row)->applyFromArray($this->_formats[$child->nodeName]);
                                                } else {
                                                        $cellContent = '----------';
                                                        $this->_flushCell($sheet,$column,$row,$cellContent);
                                                }
                                                ++$row;
                                        case 'br' :
                                                if ($this->_tableLevel > 0) {
                                                        //      If we're inside a table, replace with a \n
                                                        $cellContent .= "\n";
                                                } else {
                                                        //      Otherwise flush our existing content and move the row cursor on
                                                        $this->_flushCell($sheet,$column,$row,$cellContent);
                                                        ++$row;
                                                }
//                                              echo 'HARD LINE BREAK: ' , '<br />';
                                                break;
                                        case 'a'  :
//                                              echo 'START OF HYPERLINK: ' , '<br />';
                                                foreach($attributeArray as $attributeName => $attributeValue) {
                                                        switch($attributeName) {
                                                                case 'href':
//                                                                      echo 'Link to ' , $attributeValue , '<br />';
                                                                        $sheet->getCell($column.$row)->getHyperlink()->setUrl($attributeValue);
                                                                        if (isset($this->_formats[$child->nodeName])) {
                                                                                $sheet->getStyle($column.$row)->applyFromArray($this->_formats[$child->nodeName]);
                                                                        }
                                                                        break;
                                                        }
                                                }
                                                $cellContent .= ' ';
                                                $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//                                              echo 'END OF HYPERLINK:' , '<br />';
                                                break;
                                        case 'h1' :
                                        case 'h2' :
                                        case 'h3' :
                                        case 'h4' :
                                        case 'h5' :
                                        case 'h6' :
                                        case 'ol' :
                                        case 'ul' :
                                        case 'p'  :
                                                if ($this->_tableLevel > 0) {
                                                        //      If we're inside a table, replace with a \n
                                                        $cellContent .= "\n";
//                                                      echo 'LIST ENTRY: ' , '<br />';
                                                        $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//                                                      echo 'END OF LIST ENTRY:' , '<br />';
                                                } else {
                                                        if ($cellContent > '') {
                                                                $this->_flushCell($sheet,$column,$row,$cellContent);
                                                                $row += 2;
                                                        }
//                                                      echo 'START OF PARAGRAPH: ' , '<br />';
                                                        $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//                                                      echo 'END OF PARAGRAPH:' , '<br />';
                                                        $this->_flushCell($sheet,$column,$row,$cellContent);

                                                        if (isset($this->_formats[$child->nodeName])) {
                                                                $sheet->getStyle($column.$row)->applyFromArray($this->_formats[$child->nodeName]);
                                                        }

                                                        $row += 2;
                                                        $column = 'A';
                                                }
                                                break;
                                        case 'li'  :
                                                if ($this->_tableLevel > 0) {
                                                        //      If we're inside a table, replace with a \n
                                                        $cellContent .= "\n";
//                                                      echo 'LIST ENTRY: ' , '<br />';
                                                        $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//                                                      echo 'END OF LIST ENTRY:' , '<br />';
                                                } else {
                                                        if ($cellContent > '') {
                                                                $this->_flushCell($sheet,$column,$row,$cellContent);
                                                        }
                                                        ++$row;
//                                                      echo 'LIST ENTRY: ' , '<br />';
                                                        $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//                                                      echo 'END OF LIST ENTRY:' , '<br />';
                                                        $this->_flushCell($sheet,$column,$row,$cellContent);
                                                        $column = 'A';
                                                }
                                                break;
                                        case 'table' :
                                                $this->_flushCell($sheet,$column,$row,$cellContent);
                                                $column = $this->_setTableStartColumn($column);
//                                              echo 'START OF TABLE LEVEL ' , $this->_tableLevel , '<br />';
                                                if ($this->_tableLevel > 1)
                                                        --$row;
                                                $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//                                              echo 'END OF TABLE LEVEL ' , $this->_tableLevel , '<br />';
                                                $column = $this->_releaseTableStartColumn();
                                                if ($this->_tableLevel > 1) {
                                                        ++$column;
                                                } else {
                                                        ++$row;
                                                }
                                                break;
                                        case 'thead' :
                                        case 'tbody' :
                                                $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
                                                break;
                                        case 'tr' :
                                                ++$row;
                                                $column = $this->_getTableStartColumn();
                                                $cellContent = '';
//                                              echo 'START OF TABLE ' , $this->_tableLevel , ' ROW<br />';
                                                $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//                                              echo 'END OF TABLE ' , $this->_tableLevel , ' ROW<br />';
                                                break;
                                        case 'th' :
                                        case 'td' :
//                                              echo 'START OF TABLE ' , $this->_tableLevel , ' CELL<br />';
                                                $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//                                              echo 'END OF TABLE ' , $this->_tableLevel , ' CELL<br />';
                                                $this->_flushCell($sheet,$column,$row,$cellContent);
                                                ++$column;
                                                break;
                                        case 'body' :
                                                $row = 1;
                                                $column = 'A';
                                                $content = '';
                                                $this->_tableLevel = 0;
                                                $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
                                                break;
                                        default:
                                                $this->_processDomElement($child,$sheet,$row,$column,$cellContent);
                                }
                        }
                }
        }

        /**
         * Loads PHPExcel from file into PHPExcel instance
         *
         * @param       string          $pFilename
         * @param       PHPExcel        $objPHPExcel
         * @return      PHPExcel
         * @throws      PHPExcel_Reader_Exception
         */
        public function loadIntoExisting($pFilename, PHPExcel $objPHPExcel)
        {
                // Open file to validate
                $this->_openFile($pFilename);
                if (!$this->_isValidFormat()) {
                        fclose ($this->_fileHandle);
                        throw new PHPExcel_Reader_Exception($pFilename . " is an Invalid HTML file.");
                }
                //      Close after validating
                fclose ($this->_fileHandle);

                // Create new PHPExcel
                while ($objPHPExcel->getSheetCount() <= $this->_sheetIndex) {
                        $objPHPExcel->createSheet();
                }
                $objPHPExcel->setActiveSheetIndex( $this->_sheetIndex );

                //      Create a new DOM object
                $dom = new domDocument;
                //      Reload the HTML file into the DOM object
                $loaded = $dom->loadHTMLFile($pFilename);
                if ($loaded === FALSE) {
                        throw new PHPExcel_Reader_Exception('Failed to load ',$pFilename,' as a DOM Document');
                }

                //      Discard white space
                $dom->preserveWhiteSpace = false;


                $row = 0;
                $column = 'A';
                $content = '';
                $this->_processDomElement($dom,$objPHPExcel->getActiveSheet(),$row,$column,$content);

//              echo '<hr />';
//              var_dump($this->_dataArray);

                // Return
                return $objPHPExcel;
        }

        /**
         * Get sheet index
         *
         * @return int
         */
        public function getSheetIndex() {
                return $this->_sheetIndex;
        }

        /**
         * Set sheet index
         *
         * @param       int             $pValue         Sheet index
         * @return PHPExcel_Reader_HTML
         */
        public function setSheetIndex($pValue = 0) {
                $this->_sheetIndex = $pValue;
                return $this;
        }

}