<?php
/**
 * This file is part of PHPWord - A pure PHP library for reading and writing
 * word processing documents.
 *
 * PHPWord is free software distributed under the terms of the GNU Lesser
 * General Public License version 3 as published by the Free Software Foundation.
 *
 * For the full copyright and license information, please read the LICENSE
 * file that was distributed with this source code. For the full list of
 * contributors, visit https://github.com/PHPOffice/PHPWord/contributors.
 *
 * @see         https://github.com/PHPOffice/PHPWord
 * @copyright   2010-2018 PHPWord contributors
 * @license     http://www.gnu.org/licenses/lgpl.txt LGPL version 3
 */

namespace PhpOffice\PhpWord\Writer\ODText\Element;

/**
 * Title element writer
 *
 * @since 0.11.0
 */
class Title extends AbstractElement
{
    /**
     * Write element
     */
    public function write()
    {
        $xmlWriter = $this->getXmlWriter();
        $element = $this->getElement();
        if (!$element instanceof \PhpOffice\PhpWord\Element\Title) {
            return;
        }

        $xmlWriter->startElement('text:h');
        $hdname = 'HD';
        $sect = $element->getParent();
        if ($sect instanceof \PhpOffice\PhpWord\Element\Section) {
            if (self::compareToFirstElement($element, $sect->getElements())) {
                $hdname = 'HE';
            }
        }
        $depth = $element->getDepth();
        $xmlWriter->writeAttribute('text:style-name', "$hdname$depth");
        $xmlWriter->writeAttribute('text:outline-level', $depth);
        $xmlWriter->startElement('text:span');
        if ($depth > 0) {
            $xmlWriter->writeAttribute('text:style-name', 'Heading_' . $depth);
        } else {
            $xmlWriter->writeAttribute('text:style-name', 'Title');
        }
        $text = $element->getText();
        if (is_string($text)) {
            $this->writeText($text);
        } elseif ($text instanceof \PhpOffice\PhpWord\Element\AbstractContainer) {
            $containerWriter = new Container($xmlWriter, $text);
            $containerWriter->write();
        }
        $xmlWriter->endElement(); // text:span
        $xmlWriter->endElement(); // text:h
    }

    /**
     * Test if element is same as first element in array
     *
     * @param \PhpOffice\PhpWord\Element\AbstractElement $elem
     *
     * @param \PhpOffice\PhpWord\Element\AbstractElement[] $elemarray
     *
     * @return bool
     */
    private static function compareToFirstElement($elem, $elemarray)
    {
        return $elem === $elemarray[0];
    }
}