package com.megatim.manuel.core.convert;
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import org.apache.poi.sl.usermodel.Placeholder;
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import org.apache.poi.xslf.usermodel.XMLSlideShow;
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import org.apache.poi.xslf.usermodel.XSLFShape;
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import org.apache.poi.xslf.usermodel.XSLFSlide;
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import org.apache.poi.xslf.usermodel.XSLFTextShape;
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import java.awt.Color;
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import java.awt.Dimension;
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import java.awt.Graphics2D;
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import java.awt.image.BufferedImage;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.nio.file.Path;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* PowerPoint .pptx (XSLF) -> HTML : chaque diapositive est rendue en image PNG (rendu fidèle),
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* et son titre devient une entrée de la table des matières.
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*/
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public class PptxConverter extends AbstractHtmlConverter {
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private static final double SCALE = 2.0;
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public PptxConverter(Path outputDir) {
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super(outputDir);
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}
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@Override
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public ConversionResult convert(Path source, int order) throws IOException {
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String safe = safeBase(source, order);
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String htmlName = safe + ".html";
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List<Heading> headings = new ArrayList<>();
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List<String> images = new ArrayList<>();
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StringBuilder body = new StringBuilder();
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try (FileInputStream fis = new FileInputStream(source.toFile());
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XMLSlideShow ppt = new XMLSlideShow(fis)) {
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Dimension d = ppt.getPageSize();
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int w = (int) Math.round(d.width * SCALE);
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int h = (int) Math.round(d.height * SCALE);
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int n = 0;
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for (XSLFSlide slide : ppt.getSlides()) {
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n++;
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String title = slideTitle(slide, n);
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BufferedImage img = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
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Graphics2D g = img.createGraphics();
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applyQualityHints(g);
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g.setColor(Color.WHITE);
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g.fillRect(0, 0, w, h);
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g.scale(SCALE, SCALE);
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try {
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slide.draw(g);
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} finally {
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g.dispose();
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}
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String imgName = writeImagePng(safe, n, img);
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images.add(imgName);
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String anchor = safe + "_s" + n;
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headings.add(new Heading(title, 1, anchor));
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body.append("<h1 id=\"").append(anchor).append("\">").append(esc(title)).append("</h1>\n");
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body.append("<p class=\"slide\"><img src=\"").append(imgName)
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.append("\" alt=\"").append(esc(title)).append("\"/></p>\n");
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}
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}
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String docTitle = headings.isEmpty() ? stripExt(source.getFileName().toString()) : headings.get(0).text;
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writeHtml(htmlName, docTitle, body.toString());
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return new ConversionResult(htmlName, docTitle, headings, images);
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}
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private String slideTitle(XSLFSlide slide, int n) {
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try {
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for (XSLFShape sh : slide.getShapes()) {
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if (sh instanceof XSLFTextShape) {
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XSLFTextShape ts = (XSLFTextShape) sh;
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Placeholder ph = ts.getPlaceholder();
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if (ph == Placeholder.TITLE || ph == Placeholder.CENTERED_TITLE) {
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String t = ts.getText();
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if (t != null && !t.isBlank()) return t.trim();
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}
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}
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}
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} catch (Exception ignore) { /* pas de titre exploitable */ }
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return "Diapositive " + n;
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}
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}
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