<?php
/**
 * PHPWord
 *
 * @link        https://github.com/PHPOffice/PHPWord
 * @copyright   2014 PHPWord
 * @license     http://www.gnu.org/licenses/lgpl.txt LGPL version 3
 */

namespace PhpOffice\PhpWord\Writer\Word2007\Part;

use PhpOffice\PhpWord\Element\Section;
use PhpOffice\PhpWord\Exception\Exception;
use PhpOffice\PhpWord\PhpWord;
use PhpOffice\PhpWord\Shared\XMLWriter;
use PhpOffice\PhpWord\Writer\Word2007\Style\Section as SectionStyleWriter;

/**
 * Word2007 document part writer
 */
class Document extends AbstractPart
{
    /**
     * Write word/document.xml
     *
     * @param \PhpOffice\PhpWord\PhpWord $phpWord
     * @return string
     * @throws \PhpOffice\PhpWord\Exception\Exception
     */
    public function writeDocument(PhpWord $phpWord = null)
    {
        if (is_null($phpWord)) {
            throw new Exception("No PhpWord assigned.");
        }
        $xmlWriter = $this->getXmlWriter();
        $sections = $phpWord->getSections();
        $sectionCount = count($sections);
        $currentSection = 0;

        $xmlWriter->startDocument('1.0', 'UTF-8', 'yes');
        $xmlWriter->startElement('w:document');
        $xmlWriter->writeAttribute('xmlns:ve', 'http://schemas.openxmlformats.org/markup-compatibility/2006');
        $xmlWriter->writeAttribute('xmlns:o', 'urn:schemas-microsoft-com:office:office');
        $xmlWriter->writeAttribute('xmlns:r', 'http://schemas.openxmlformats.org/officeDocument/2006/relationships');
        $xmlWriter->writeAttribute('xmlns:m', 'http://schemas.openxmlformats.org/officeDocument/2006/math');
        $xmlWriter->writeAttribute('xmlns:v', 'urn:schemas-microsoft-com:vml');
        $xmlWriter->writeAttribute('xmlns:wp', 'http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing');
        $xmlWriter->writeAttribute('xmlns:w10', 'urn:schemas-microsoft-com:office:word');
        $xmlWriter->writeAttribute('xmlns:w', 'http://schemas.openxmlformats.org/wordprocessingml/2006/main');
        $xmlWriter->writeAttribute('xmlns:wne', 'http://schemas.microsoft.com/office/word/2006/wordml');

        $xmlWriter->startElement('w:body');


        if ($sectionCount > 0) {
            foreach ($sections as $section) {
                $currentSection++;
                $this->writeContainerElements($xmlWriter, $section);
                if ($currentSection == $sectionCount) {
                    $this->writeSectionSettings($xmlWriter, $section);
                } else {
                    $this->writeSection($xmlWriter, $section);
                }
            }
        }

        $xmlWriter->endElement(); // w:body
        $xmlWriter->endElement(); // w:document

        return $xmlWriter->getData();
    }

    /**
     * Write begin section
     *
     * @param \PhpOffice\PhpWord\Shared\XMLWriter $xmlWriter
     * @param \PhpOffice\PhpWord\Element\Section $section
     */
    private function writeSection(XMLWriter $xmlWriter, Section $section)
    {
        $xmlWriter->startElement('w:p');
        $xmlWriter->startElement('w:pPr');
        $this->writeSectionSettings($xmlWriter, $section);
        $xmlWriter->endElement();
        $xmlWriter->endElement();
    }

    /**
     * Write end section
     *
     * @param \PhpOffice\PhpWord\Shared\XMLWriter $xmlWriter
     * @param \PhpOffice\PhpWord\Element\Section $section
     */
    private function writeSectionSettings(XMLWriter $xmlWriter, Section $section)
    {
        $xmlWriter->startElement('w:sectPr');

        // Header reference
        foreach ($section->getHeaders() as $header) {
            $rId = $header->getRelationId();
            $xmlWriter->startElement('w:headerReference');
            $xmlWriter->writeAttribute('w:type', $header->getType());
            $xmlWriter->writeAttribute('r:id', 'rId' . $rId);
            $xmlWriter->endElement();
        }

        // Footer reference
        foreach ($section->getFooters() as $footer) {
            $rId = $footer->getRelationId();
            $xmlWriter->startElement('w:footerReference');
            $xmlWriter->writeAttribute('w:type', $footer->getType());
            $xmlWriter->writeAttribute('r:id', 'rId' . $rId);
            $xmlWriter->endElement();
        }

        // Different first page
        if ($section->hasDifferentFirstPage()) {
            $xmlWriter->startElement('w:titlePg');
            $xmlWriter->endElement();
        }

        // Section settings
        $styleWriter = new SectionStyleWriter($xmlWriter, $section->getSettings());
        $styleWriter->write();

        $xmlWriter->endElement(); // w:sectPr
    }
}