<?php
/**
 * Excel 2007-2019/Office 365 Reader Class
 *
 * Based on SimpleXLSX v0.8.24 by Sergey Shuchkin.
 * @link https://github.com/shuchkin/simplexlsx/
 *
 * @package TablePress
 * @subpackage Import
 * @author Sergey Shuchkin, Tobias Bäthge
 * @since 1.1.0
 */

// Prohibit direct script loading.
defined( 'ABSPATH' ) || die( 'No direct script access allowed!' );

/** @noinspection PhpUndefinedFieldInspection */
/** @noinspection PhpComposerExtensionStubsInspection */
/** @noinspection MultiAssignmentUsageInspection */

/**
 * PHP Excel 2007-2013/Office 365 Reader Class
 * @package TablePress
 * @subpackage Import
 * @author Sergey Shuchkin, Tobias Bäthge
 * @since 1.1.0
 */
class SimpleXLSX {
	public static $CF = [ // Cell formats
		0  => 'General',
		1  => '0',
		2  => '0.00',
		3  => '#,##0',
		4  => '#,##0.00',
		9  => '0%',
		10 => '0.00%',
		11 => '0.00E+00',
		12 => '# ?/?',
		13 => '# ??/??',
		14 => 'mm-dd-yy',
		15 => 'd-mmm-yy',
		16 => 'd-mmm',
		17 => 'mmm-yy',
		18 => 'h:mm AM/PM',
		19 => 'h:mm:ss AM/PM',
		20 => 'h:mm',
		21 => 'h:mm:ss',
		22 => 'm/d/yy h:mm',

		37 => '#,##0 ;(#,##0)',
		38 => '#,##0 ;[Red](#,##0)',
		39 => '#,##0.00;(#,##0.00)',
		40 => '#,##0.00;[Red](#,##0.00)',

		44 => '_("$"* #,##0.00_);_("$"* \(#,##0.00\);_("$"* "-"??_);_(@_)',
		45 => 'mm:ss',
		46 => '[h]:mm:ss',
		47 => 'mmss.0',
		48 => '##0.0E+0',
		49 => '@',

		27 => '[$-404]e/m/d',
		30 => 'm/d/yy',
		36 => '[$-404]e/m/d',
		50 => '[$-404]e/m/d',
		57 => '[$-404]e/m/d',

		59 => 't0',
		60 => 't0.00',
		61 => 't#,##0',
		62 => 't#,##0.00',
		67 => 't0%',
		68 => 't0.00%',
		69 => 't# ?/?',
		70 => 't# ??/??',
	];
	public $cellFormats = [];
	public $datetimeFormat = 'Y-m-d H:i:s';
	public $debug;

	/* @var SimpleXMLElement[] $sheets */
	protected $sheets;
	protected $sheetNames = [];
	protected $sheetFiles = [];
	// scheme
	protected $styles;
	protected $hyperlinks;
	/* @var array[] $package */
	protected $package;
	protected $sharedstrings;
	protected $date1904 = 0;


	/*
		private $date_formats = array(
			0xe => "d/m/Y",
			0xf => "d-M-Y",
			0x10 => "d-M",
			0x11 => "M-Y",
			0x12 => "h:i a",
			0x13 => "h:i:s a",
			0x14 => "H:i",
			0x15 => "H:i:s",
			0x16 => "d/m/Y H:i",
			0x2d => "i:s",
			0x2e => "H:i:s",
			0x2f => "i:s.S"
		);
		private $number_formats = array(
			0x1 => "%1.0f",     // "0"
			0x2 => "%1.2f",     // "0.00",
			0x3 => "%1.0f",     //"#,##0",
			0x4 => "%1.2f",     //"#,##0.00",
			0x5 => "%1.0f",     //"$#,##0;($#,##0)",
			0x6 => '$%1.0f',    //"$#,##0;($#,##0)",
			0x7 => '$%1.2f',    //"$#,##0.00;($#,##0.00)",
			0x8 => '$%1.2f',    //"$#,##0.00;($#,##0.00)",
			0x9 => '%1.0f%%',   //"0%"
			0xa => '%1.2f%%',   //"0.00%"
			0xb => '%1.2f',     //"0.00E00",
			0x25 => '%1.0f',    //"#,##0;(#,##0)",
			0x26 => '%1.0f',    //"#,##0;(#,##0)",
			0x27 => '%1.2f',    //"#,##0.00;(#,##0.00)",
			0x28 => '%1.2f',    //"#,##0.00;(#,##0.00)",
			0x29 => '%1.0f',    //"#,##0;(#,##0)",
			0x2a => '$%1.0f',   //"$#,##0;($#,##0)",
			0x2b => '%1.2f',    //"#,##0.00;(#,##0.00)",
			0x2c => '$%1.2f',   //"$#,##0.00;($#,##0.00)",
			0x30 => '%1.0f');   //"##0.0E0";
		// }}}
	*/
	protected $errno = 0;
	protected $error = false;


	public function __construct( $filename = null, $is_data = null, $debug = null ) {
		if ( $debug !== null ) {
			$this->debug = $debug;
		}
		$this->package = [
			'filename' => '',
			'mtime'    => 0,
			'size'     => 0,
			'comment'  => '',
			'entries'  => []
		];
		if ( $filename && $this->_unzip( $filename, $is_data ) ) {
			$this->_parse();
		}
	}

	public static function parseFile( $filename, $debug = false ) {
		return self::parse( $filename, false, $debug );
	}

	public static function parseData( $data, $debug = false ) {
		return self::parse( $data, true, $debug );
	}

	public static function parse( $filename, $is_data = false, $debug = false ) {
		$xlsx        = new self();
		$xlsx->debug = $debug;
		if ( $xlsx->_unzip( $filename, $is_data ) ) {
			$xlsx->_parse();
		}
		if ( $xlsx->success() ) {
			return $xlsx;
		}
		self::parseError( $xlsx->error() );
		self::parseErrno( $xlsx->errno() );

		return false;
	}

	public static function parseError( $set = false ) {
		static $error = false;

		return $set ? $error = $set : $error;
	}

	public static function parseErrno( $set = false ) {
		static $errno = false;

		return $set ? $errno = $set : $errno;
	}

	protected function _unzip( $filename, $is_data = false ) {

		if ( $is_data ) {

			$this->package['filename'] = 'default.xlsx';
			$this->package['mtime']    = time();
			$this->package['size']     = $this->_strlen( $filename );

			$vZ = $filename;
		} else {

			if ( ! is_readable( $filename ) ) {
				$this->error( 1, 'File not found ' . $filename );

				return false;
			}

			// Package information
			$this->package['filename'] = $filename;
			$this->package['mtime']    = filemtime( $filename );
			$this->package['size']     = filesize( $filename );

			// Read file
			$vZ = file_get_contents( $filename );
		}
		// Cut end of central directory
		/*		$aE = explode("\x50\x4b\x05\x06", $vZ);

				if (count($aE) == 1) {
					$this->error('Unknown format');
					return false;
				}
		*/
		// Explode to each part
		$aE = explode( "\x50\x4b\x03\x04", $vZ );
		array_shift( $aE );

		$aEL = count( $aE );
		if ( $aEL === 0 ) {
			$this->error( 2, 'Unknown archive format' );

			return false;
		}
		// Search central directory end record
		$last = $aE[ $aEL - 1 ];
		$last = explode( "\x50\x4b\x05\x06", $last );
		if ( count( $last ) !== 2 ) {
			$this->error( 2, 'Unknown archive format' );

			return false;
		}
		// Search central directory
		$last = explode( "\x50\x4b\x01\x02", $last[0] );
		if ( count( $last ) < 2 ) {
			$this->error( 2, 'Unknown archive format' );

			return false;
		}
		$aE[ $aEL - 1 ] = $last[0];

		// Loop through the entries
		foreach ( $aE as $vZ ) {
			$aI       = [];
			$aI['E']  = 0;
			$aI['EM'] = '';
			// Retrieving local file header information
//			$aP = unpack('v1VN/v1GPF/v1CM/v1FT/v1FD/V1CRC/V1CS/V1UCS/v1FNL', $vZ);
			$aP = unpack( 'v1VN/v1GPF/v1CM/v1FT/v1FD/V1CRC/V1CS/V1UCS/v1FNL/v1EFL', $vZ );

			// Check if data is encrypted
//			$bE = ($aP['GPF'] && 0x0001) ? TRUE : FALSE;
			$bE = false;
			$nF = $aP['FNL'];
			$mF = $aP['EFL'];

			// Special case : value block after the compressed data
			if ( $aP['GPF'] & 0x0008 ) {
				$aP1 = unpack( 'V1CRC/V1CS/V1UCS', $this->_substr( $vZ, - 12 ) );

				$aP['CRC'] = $aP1['CRC'];
				$aP['CS']  = $aP1['CS'];
				$aP['UCS'] = $aP1['UCS'];
				// 2013-08-10
				$vZ = $this->_substr( $vZ, 0, - 12 );
				if ( $this->_substr( $vZ, - 4 ) === "\x50\x4b\x07\x08" ) {
					$vZ = $this->_substr( $vZ, 0, - 4 );
				}
			}

			// Getting stored filename
			$aI['N'] = $this->_substr( $vZ, 26, $nF );
			$aI['N'] = str_replace( '\\', '/', $aI['N'] );

			if ( $this->_substr( $aI['N'], - 1 ) === '/' ) {
				// is a directory entry - will be skipped
				continue;
			}

			// Truncate full filename in path and filename
			$aI['P'] = dirname( $aI['N'] );
			$aI['P'] = ( $aI['P'] === '.' ) ? '' : $aI['P'];
			$aI['N'] = basename( $aI['N'] );

			$vZ = $this->_substr( $vZ, 26 + $nF + $mF );

			if ( $this->_strlen( $vZ ) !== (int) $aP['CS'] ) { // check only if availabled
				$aI['E']  = 1;
				$aI['EM'] = 'Compressed size is not equal with the value in header information.';
			} elseif ( $bE ) {
				$aI['E']  = 5;
				$aI['EM'] = 'File is encrypted, which is not supported from this class.';
			} else {
				switch ( $aP['CM'] ) {
					case 0: // Stored
						// Here is nothing to do, the file ist flat.
						break;
					case 8: // Deflated
						$vZ = gzinflate( $vZ );
						break;
					case 12: // BZIP2
						if ( extension_loaded( 'bz2' ) ) {
							/** @noinspection PhpComposerExtensionStubsInspection */
							$vZ = bzdecompress( $vZ );
						} else {
							$aI['E']  = 7;
							$aI['EM'] = 'PHP BZIP2 extension not available.';
						}
						break;
					default:
						$aI['E']  = 6;
						$aI['EM'] = "De-/Compression method {$aP['CM']} is not supported.";
				}
				if ( ! $aI['E'] ) {
					if ( $vZ === false ) {
						$aI['E']  = 2;
						$aI['EM'] = 'Decompression of data failed.';
					} elseif ( $this->_strlen( $vZ ) !== (int) $aP['UCS'] ) {
						$aI['E']  = 3;
						$aI['EM'] = 'Uncompressed size is not equal with the value in header information.';
					} elseif ( crc32( $vZ ) !== $aP['CRC'] ) {
						$aI['E']  = 4;
						$aI['EM'] = 'CRC32 checksum is not equal with the value in header information.';
					}
				}
			}

			$aI['D'] = $vZ;

			// DOS to UNIX timestamp
			$aI['T'] = mktime( ( $aP['FT'] & 0xf800 ) >> 11,
				( $aP['FT'] & 0x07e0 ) >> 5,
				( $aP['FT'] & 0x001f ) << 1,
				( $aP['FD'] & 0x01e0 ) >> 5,
				$aP['FD'] & 0x001f,
				( ( $aP['FD'] & 0xfe00 ) >> 9 ) + 1980 );

			//$this->Entries[] = &new SimpleUnzipEntry($aI);
			$this->package['entries'][] = [
				'data'      => $aI['D'],
				'error'     => $aI['E'],
				'error_msg' => $aI['EM'],
				'name'      => $aI['N'],
				'path'      => $aI['P'],
				'time'      => $aI['T']
			];

		} // end for each entries

		return true;
	}

	// sheets numeration: 1,2,3....

	public function error( $num = null, $str = null ) {
		if ( $num ) {
			$this->errno = $num;
			$this->error = $str;
			if ( $this->debug ) {
				trigger_error( __CLASS__ . ': ' . $this->error, E_USER_WARNING );
			}
		}

		return $this->error;
	}

	public function errno() {
		return $this->errno;
	}

	protected function _parse() {
		// Document data holders
		$this->sharedstrings = [];
		$this->sheets        = [];
//		$this->styles = array();

		// Read relations and search for officeDocument
		if ( $relations = $this->getEntryXML( '_rels/.rels' ) ) {

			foreach ( $relations->Relationship as $rel ) {

				$rel_type   = basename( trim( (string) $rel['Type'] ) ); // officeDocument
				$rel_target = $this->_getTarget( '', (string) $rel['Target'] ); // /xl/workbook.xml or xl/workbook.xml

				if ( $rel_type === 'officeDocument' && $workbook = $this->getEntryXML( $rel_target ) ) {

					$index_rId = []; // [0 => rId1]

					$index = 0;
					foreach ( $workbook->sheets->sheet as $s ) {
						$this->sheetNames[ $index ] = (string) $s['name'];
						$index_rId[ $index ]        = (string) $s['id'];
						$index ++;
					}
					if ( (int) $workbook->workbookPr['date1904'] === 1 ) {
						$this->date1904 = 1;
					}


					if ( $workbookRelations = $this->getEntryXML( dirname( $rel_target ) . '/_rels/workbook.xml.rels' ) ) {

						// Loop relations for workbook and extract sheets...
						foreach ( $workbookRelations->Relationship as $workbookRelation ) {

							$wrel_type = basename( trim( (string) $workbookRelation['Type'] ) );
							$wrel_path = $this->_getTarget( dirname( $rel_target ), (string) $workbookRelation['Target'] );
							if ( ! $this->entryExists( $wrel_path ) ) {
								continue;
							}


							if ( $wrel_type === 'worksheet' ) { // Sheets

								if ( $sheet = $this->getEntryXML( $wrel_path ) ) {
									$index                  = array_search( (string) $workbookRelation['Id'], $index_rId, false );
									$this->sheets[ $index ] = $sheet;
									$this->sheetFiles[ $index ] = $wrel_path;
								}

							} elseif ( $wrel_type === 'sharedStrings' ) {

								if ( $sharedStrings = $this->getEntryXML( $wrel_path ) ) {
									foreach ( $sharedStrings->si as $val ) {
										if ( isset( $val->t ) ) {
											$this->sharedstrings[] = (string) $val->t;
										} elseif ( isset( $val->r ) ) {
											$this->sharedstrings[] = $this->_parseRichText( $val );
										}
									}
								}
							} elseif ( $wrel_type === 'styles' ) {

								$this->styles = $this->getEntryXML( $wrel_path );

								$nf = [];
								if ( $this->styles->numFmts->numFmt !== null ) {
									foreach ( $this->styles->numFmts->numFmt as $v ) {
										$nf[ (int) $v['numFmtId'] ] = (string) $v['formatCode'];
									}
								}

								if ( $this->styles->cellXfs->xf !== null ) {
									foreach ( $this->styles->cellXfs->xf as $v ) {
										$v           = (array) $v->attributes();
										$v['format'] = '';

										if ( isset( $v['@attributes']['numFmtId'] ) ) {
											$v   = $v['@attributes'];
											$fid = (int) $v['numFmtId'];
											// formats priority
											if ( isset( $nf[ $fid ] ) ) {
												$v['format'] = $nf[ $fid ];
											} elseif ( isset( self::$CF[ $fid ] ) ) {
												$v['format'] = self::$CF[ $fid ];
											}
										}
										$this->cellFormats[] = $v;
									}
								}
							}
						}

						break;
					}
				}
			}
		}
		if ( count( $this->sheets ) ) {
			// Sort sheets
			ksort( $this->sheets );

			return true;
		}

		return false;
	}

	/*
	 * @param string $name Filename in archive
	 * @return SimpleXMLElement|bool
	*/
	public function getEntryXML( $name ) {
		if ( $entry_xml = $this->getEntryData( $name ) ) {
			$entry_xml = trim( $entry_xml );
			// dirty remove namespace prefixes and empty rows
			$entry_xml = preg_replace( '/xmlns[^=]*="[^"]*"/i', '', $entry_xml ); // remove namespaces
			$entry_xml = preg_replace( '/[a-zA-Z0-9]+:([a-zA-Z0-9]+="[^"]+")/', '$1$2', $entry_xml ); // remove namespaced attrs
			$entry_xml = preg_replace( '/<[a-zA-Z0-9]+:([^>]+)>/', '<$1>', $entry_xml ); // fix namespaced openned tags
			$entry_xml = preg_replace( '/<\/[a-zA-Z0-9]+:([^>]+)>/', '</$1>', $entry_xml ); // fix namespaced closed tags

//			if ( $this->skipEmptyRows && strpos($name, '/sheet') ) {
			if ( strpos( $name, '/sheet' ) ) { // dirty skip empty rows
				$entry_xml = preg_replace( '/<row[^>]+>\s*(<c[^\/]+\/>\s*)+<\/row>/', '', $entry_xml, - 1, $cnt ); // remove empty rows
				$entry_xml = preg_replace( '/<row[^\/>]*\/>/', '', $entry_xml, - 1, $cnt2 );
				$entry_xml = preg_replace( '/<row[^>]*><\/row>/', '', $entry_xml, - 1, $cnt3 );
				if ( $cnt || $cnt2 || $cnt3 ) {
					$entry_xml = preg_replace( '/<dimension[^\/]+\/>/', '', $entry_xml );
				}
//				file_put_contents( basename( $name ), $entry_xml ); // @to do comment!!!
			}

			// XML External Entity (XXE) Prevention, libxml_disable_entity_loader deprecated in PHP 8
			if ( LIBXML_VERSION < 20900 ) {
				$_old = libxml_disable_entity_loader();
			}
			$entry_xmlobj = simplexml_load_string( $entry_xml );
			if ( LIBXML_VERSION < 20900 ) {
				/** @noinspection PhpUndefinedVariableInspection */
				libxml_disable_entity_loader( $_old );
			}
			if ( $entry_xmlobj ) {
				return $entry_xmlobj;
			}
			$e = libxml_get_last_error();
			if ( $e ) {
				$this->error( 3, 'XML-entry ' . $name . ' parser error ' . $e->message . ' line ' . $e->line );
			}
		} else {
			$this->error( 4, 'XML-entry not found ' . $name );
		}

		return false;
	}

	public function getEntryData( $name ) {
		$name = ltrim( str_replace( '\\', '/', $name ), '/' );
		$dir  = $this->_strtoupper( dirname( $name ) );
		$name = $this->_strtoupper( basename( $name ) );
		foreach ( $this->package['entries'] as $entry ) {
			if ( $this->_strtoupper( $entry['path'] ) === $dir && $this->_strtoupper( $entry['name'] ) === $name ) {
				return $entry['data'];
			}
		}
		$this->error( 5, 'Entry not found ' . ( $dir ? $dir . '/' : '' ) . $name );

		return false;
	}

	public function entryExists( $name ) { // 0.6.6
		$dir  = $this->_strtoupper( dirname( $name ) );
		$name = $this->_strtoupper( basename( $name ) );
		foreach ( $this->package['entries'] as $entry ) {
			if ( $this->_strtoupper( $entry['path'] ) === $dir && $this->_strtoupper( $entry['name'] ) === $name ) {
				return true;
			}
		}

		return false;
	}

	public function success() {
		return ! $this->error;
	}

	public function rows( $worksheetIndex = 0 ) {

		if ( ( $ws = $this->worksheet( $worksheetIndex ) ) === false ) {
			return false;
		}
		$dim     = $this->dimension( $worksheetIndex );
		$numCols = $dim[0];
		$numRows = $dim[1];

		$emptyRow = [];
		for ( $i = 0; $i < $numCols; $i ++ ) {
			$emptyRow[] = '';
		}

		$rows = [];
		for ( $i = 0; $i < $numRows; $i ++ ) {
			$rows[] = $emptyRow;
		}

		$curR = 0;
		/* @var SimpleXMLElement $ws */
		foreach ( $ws->sheetData->row as $row ) {
			$curC = 0;
			foreach ( $row->c as $c ) {
				// detect skipped cols
				$idx = $this->getIndex( (string) $c['r'] );
				$x   = $idx[0];
				$y   = $idx[1];

				if ( $x > - 1 ) {
					$curC = $x;
					$curR = $y;
				}

				$rows[ $curR ][ $curC ] = $this->value( $c );
				$curC ++;
			}

			$curR ++;
		}

		return $rows;
	}
	// https://github.com/shuchkin/simplexlsx#gets-extend-cell-info-by--rowsex
	public function rowsEx( $worksheetIndex = 0 ) {

		if ( ( $ws = $this->worksheet( $worksheetIndex ) ) === false ) {
			return false;
		}

		$rows = [];

		$dim     = $this->dimension( $worksheetIndex );
		$numCols = $dim[0];
		$numRows = $dim[1];

		for ( $y = 0; $y < $numRows; $y ++ ) {
			for ( $x = 0; $x < $numCols; $x ++ ) {
				// 0.6.8
				$c = '';
				for ( $k = $x; $k >= 0; $k = (int) ( $k / 26 ) - 1 ) {
					$c = chr( $k % 26 + 65 ) . $c;
				}
				$rows[ $y ][ $x ] = [
					'type'   => '',
					'name'   => $c . ( $y + 1 ),
					'value'  => '',
					'href'   => '',
					'f'      => '',
					'format' => '',
					'r'      => $y
				];
			}
		}

		$curR = 0;
		/* @var SimpleXMLElement $ws */
		foreach ( $ws->sheetData->row as $row ) {

			$r_idx = (int) $row['r'];
			$curC  = 0;

			foreach ( $row->c as $c ) {
				$r = (string) $c['r'];
				$t = (string) $c['t'];
				$s = (int) $c['s'];

				$idx = $this->getIndex( $r );
				$x   = $idx[0];
				$y   = $idx[1];

				if ( $x > - 1 ) {
					$curC = $x;
					$curR = $y;
				}

				if ( $s > 0 && isset( $this->cellFormats[ $s ] ) ) {
					$format = $this->cellFormats[ $s ]['format'];
				} else {
					$format = '';
				}

				$rows[ $curR ][ $curC ] = [
					'type'   => $t,
					'name'   => (string) $c['r'],
					'value'  => $this->value( $c ),
					'href'   => $this->href( $worksheetIndex, $c ),
					'f'      => (string) $c->f,
					'format' => $format,
					'r'      => $r_idx
				];
				$curC ++;
			}
			$curR ++;
		}

		return $rows;

	}

	public function toHTML( $worksheetIndex = 0 ) {
		$s = '<table class=excel>';
		foreach ( $this->rows( $worksheetIndex ) as $r ) {
			$s .= '<tr>';
			foreach ( $r as $c ) {
				$s .= '<td nowrap>' . ( $c === '' ? '&nbsp' : htmlspecialchars( $c, ENT_QUOTES ) ) . '</td>';
			}
			$s .= "</tr>\r\n";
		}
		$s .= '</table>';

		return $s;
	}

	public function worksheet( $worksheetIndex = 0 ) {


		if ( isset( $this->sheets[ $worksheetIndex ] ) ) {
			$ws = $this->sheets[ $worksheetIndex ];

			if ( !isset($this->hyperlinks[ $worksheetIndex ]) && isset( $ws->hyperlinks ) ) {
				$this->hyperlinks[ $worksheetIndex ] = [];
				$sheet_rels = str_replace('worksheets','worksheets/_rels', $this->sheetFiles[$worksheetIndex]).'.rels';
				$link_ids = [];

				if ( $rels = $this->getEntryXML( $sheet_rels ) ) {
					// hyperlink
//					$rel_base = dirname( $sheet_rels );
					foreach ( $rels->Relationship as $rel ) {
						$rel_type = basename( trim( (string)$rel['Type'] ) );
						if ( $rel_type === 'hyperlink' ) {
							$rel_id = (string)$rel['Id'];
							$rel_target = (string)$rel['Target'];
							$link_ids[ $rel_id ] = $rel_target;
						}
					}
				}
				foreach ( $ws->hyperlinks->hyperlink as $hyperlink ) {
					$ref = (string) $hyperlink['ref'];
					if ( $this->_strpos($ref,':') > 0 ) { // A1:A8 -> A1
						$ref = explode(':', $ref);
						$ref = $ref[0];
					}
//						$this->hyperlinks[ $worksheetIndex ][ $ref ] = (string) $hyperlink['display'];
					$loc = (string) $hyperlink['location'];
					$id = (string) $hyperlink['id'];
					if ( $id ) {
						$href = $link_ids[ $id ] . ( $loc ? '#' . $loc : '');
					} else {
						$href = $loc;
					}
					$this->hyperlinks[ $worksheetIndex ][ $ref ] = $href;
				}
			}

			return $ws;
		}
		$this->error( 6, 'Worksheet not found ' . $worksheetIndex );

		return false;
	}

	/**
	 * returns [numCols,numRows] of worksheet
	 *
	 * @param int $worksheetIndex
	 *
	 * @return array
	 */
	public function dimension( $worksheetIndex = 0 ) {

		if ( ( $ws = $this->worksheet( $worksheetIndex ) ) === false ) {
			return [ 0, 0 ];
		}
		/* @var SimpleXMLElement $ws */

		$ref = (string) $ws->dimension['ref'];

		if ( $this->_strpos( $ref, ':' ) !== false ) {
			$d   = explode( ':', $ref );
			$idx = $this->getIndex( $d[1] );

			return [ $idx[0] + 1, $idx[1] + 1 ];
		}
		/*
		if ( $ref !== '' ) { // 0.6.8
			$index = $this->getIndex( $ref );

			return [ $index[0] + 1, $index[1] + 1 ];
		}
		*/

		// slow method
		$maxC = $maxR = 0;
		foreach ( $ws->sheetData->row as $row ) {
			foreach ( $row->c as $c ) {
				$idx = $this->getIndex( (string) $c['r'] );
				$x   = $idx[0];
				$y   = $idx[1];
				if ( $x > 0 ) {
					if ( $x > $maxC ) {
						$maxC = $x;
					}
					if ( $y > $maxR ) {
						$maxR = $y;
					}
				}
			}
		}

		return [ $maxC + 1, $maxR + 1 ];
	}

	public function getIndex( $cell = 'A1' ) {

		if ( preg_match( '/([A-Z]+)(\d+)/', $cell, $m ) ) {
			$col = $m[1];
			$row = $m[2];

			$colLen = $this->_strlen( $col );
			$index  = 0;

			for ( $i = $colLen - 1; $i >= 0; $i -- ) {
				/** @noinspection PowerOperatorCanBeUsedInspection */
				$index += ( ord( $col[ $i ] ) - 64 ) * pow( 26, $colLen - $i - 1 );
			}

			return [ $index - 1, $row - 1 ];
		}

//		$this->error( 'Invalid cell index ' . $cell );

		return [ - 1, - 1 ];
	}

	public function value( $cell ) {
		// Determine data type
		$dataType = (string) $cell['t'];

		if ( $dataType === '' || $dataType === 'n' ) { // number
			$s = (int) $cell['s'];
			if ( $s > 0 && isset( $this->cellFormats[ $s ] ) ) {
				if (array_key_exists('format', $this->cellFormats[ $s ])) {
					$format = $this->cellFormats[ $s ]['format'];
					if ( preg_match( '/[mM]/', $format ) ) { // [m]onth
						$dataType = 'd';
					}
				}
				else {
					$dataType = 's';
				}
			}
		}

		$value = '';

		switch ( $dataType ) {
			case 's':
				// Value is a shared string
				if ( (string) $cell->v !== '' ) {
					$value = $this->sharedstrings[ (int) $cell->v ];
				}

				break;

			case 'b':
				// Value is boolean
				$value = (string) $cell->v;
				if ( $value === '0' ) {
					$value = false;
				} elseif ( $value === '1' ) {
					$value = true;
				} else {
					$value = (bool) $cell->v;
				}

				break;

			case 'inlineStr':
				// Value is rich text inline
				$value = $this->_parseRichText( $cell->is );

				break;

			case 'e':
				// Value is an error message
				if ( (string) $cell->v !== '' ) {
					$value = (string) $cell->v;
				}

				break;
			case 'd':
				// Value is a date and non-empty
				if ( ! empty( $cell->v ) ) {
					$value = $this->datetimeFormat ? gmdate( $this->datetimeFormat, $this->unixstamp( (float) $cell->v ) ) : (float) $cell->v;
				}
				break;


			default:
				// Value is a string
				$value = (string) $cell->v;

				// Check for numeric values
				if ( is_numeric( $value ) && $dataType !== 's' ) {
					/** @noinspection TypeUnsafeComparisonInspection */
					if ( $value == (int) $value ) {
						$value = (int) $value;
					} /** @noinspection TypeUnsafeComparisonInspection */ elseif ( $value == (float) $value ) {
						$value = (float) $value;
					}
				}
		}

		return $value;
	}

	public function unixstamp( $excelDateTime ) {

		$d = floor( $excelDateTime ); // days since 1900 or 1904
		$t = $excelDateTime - $d;

		if ( $this->date1904 ) {
			$d += 1462;
		}

		$t = ( abs( $d ) > 0 ) ? ( $d - 25569 ) * 86400 + round( $t * 86400 ) : round( $t * 86400 );

		return (int) $t;
	}

	/**
	 * Returns cell value
	 * VERY SLOW! Use ->rows() or ->rowsEx()
	 *
	 * @param int $worksheetIndex
	 * @param string|array $cell ref or coords, D12 or [3,12]
	 *
	 * @return mixed Returns NULL if not found
	 */
	public function getCell( $worksheetIndex = 0, $cell = 'A1' ) {

		if ( ( $ws = $this->worksheet( $worksheetIndex ) ) === false ) {
			return false;
		}
		if ( is_array( $cell )) {
			$cell = $this->_num2name($cell[0]).$cell[1];// [3,21] -> D21
		}
		if ( is_string( $cell ) ) {
			$result = $ws->sheetData->xpath( "row/c[@r='" . $cell . "']" );
			if ( count($result) ) {
				return $this->value( $result[0] );
			}
		}

		return null;
	}

	public function href( $worksheetIndex, $cell ) {
		$ref = (string) $cell['r'];
		return isset( $this->hyperlinks[ $worksheetIndex ][ $ref ] ) ? $this->hyperlinks[ $worksheetIndex ][ $ref ] : '';
	}

	public function sheets() {
		return $this->sheets;
	}

	public function sheetsCount() {
		return count( $this->sheets );
	}

	public function sheetName( $worksheetIndex ) {
		if ( isset( $this->sheetNames[ $worksheetIndex ] ) ) {
			return $this->sheetNames[ $worksheetIndex ];
		}

		return false;
	}

	public function sheetNames() {

		return $this->sheetNames;
	}

	// thx Gonzo

	public function getStyles() {
		return $this->styles;
	}

	public function getPackage() {
		return $this->package;
	}

	public function setDateTimeFormat( $value ) {
		$this->datetimeFormat = is_string( $value ) ? $value : false;
	}
	protected function _parseRichText( $is = null ) {
		$value = [];

		if ( isset( $is->t ) ) {
			$value[] = (string) $is->t;
		} elseif ( isset( $is->r ) ) {
			foreach ( $is->r as $run ) {
				$value[] = (string) $run->t;
			}
		}

		return implode( '', $value );
	}

	protected function _strlen( $str ) {
		return ( ini_get( 'mbstring.func_overload' ) & 2 ) ? mb_strlen( $str, '8bit' ) : strlen( $str );
	}

	protected function _strpos( $haystack, $needle, $offset = 0 ) {
		return ( ini_get( 'mbstring.func_overload' ) & 2 ) ? mb_strpos( $haystack, $needle, $offset, '8bit' ) : strpos( $haystack, $needle, $offset );
	}

	/*
		private function _strrpos( $haystack, $needle, $offset = 0 ) {
			return (ini_get('mbstring.func_overload') & 2) ? mb_strrpos( $haystack, $needle, $offset, '8bit') : strrpos($haystack, $needle, $offset);
		}*/
	protected function _strtoupper( $str ) {
		return ( ini_get( 'mbstring.func_overload' ) & 2 ) ? mb_strtoupper( $str, '8bit' ) : strtoupper( $str );
	}

	protected function _substr( $str, $start, $length = null ) {
		return ( ini_get( 'mbstring.func_overload' ) & 2 ) ? mb_substr( $str, $start, ( $length === null ) ? mb_strlen( $str, '8bit' ) : $length, '8bit' ) : substr( $str, $start, ( $length === null ) ? strlen( $str ) : $length );
	}

	protected function _getTarget( $base, $target ) {
		$target = trim( $target );
		if ( strpos( $target, '/' ) === 0 ) {
			return $this->_substr( $target, 1 );
		}
		$target = ( $base ? $base . '/' : '' ) . $target;
		// a/b/../c -> a/c
		$parts = explode( '/', $target );
		$abs   = [];
		foreach ( $parts as $p ) {
			if ( '.' === $p ) {
				continue;
			}
			if ( '..' === $p ) {
				array_pop( $abs );
			} else {
				$abs[] = $p;
			}
		}
		return implode( '/', $abs );
	}
	protected function _num2name($num) {
		$numeric = ($num - 1) % 26;
		$letter  = chr( 65 + $numeric );
		$num2    = (int) ( ($num-1) / 26 );
		if ( $num2 > 0 ) {
			return $this->_num2name( $num2 ) . $letter;
		}
		return $letter;
	}

} // class SimpleXLSX
