package com.megatim.manuel.core.convert;
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import javax.imageio.ImageIO;
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import java.awt.Graphics2D;
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import java.awt.RenderingHints;
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import java.awt.image.BufferedImage;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/** Outils partagés par tous les convertisseurs : nommage, échappement, écriture HTML et images. */
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public abstract class AbstractHtmlConverter implements DocumentConverter {
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/** Reconnaît "Heading 2", "heading2", "Titre 3", "Título 1", "..._niveau_3"... */
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private static final Pattern HEADING =
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Pattern.compile("(?i).*?(?:heading|titre|t[ií]tulo|niveau)[\\s_]*([1-6]).*");
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protected final Path outputDir;
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protected AbstractHtmlConverter(Path outputDir) {
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this.outputDir = outputDir;
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}
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/** Niveau de titre déduit d'un nom/identifiant de style Word, ou 0 si ce n'est pas un titre. */
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protected static int matchHeading(String s) {
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if (s == null) return 0;
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Matcher m = HEADING.matcher(s);
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if (m.matches()) return Integer.parseInt(m.group(1));
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if (s.equalsIgnoreCase("Title") || s.equalsIgnoreCase("Titre")) return 1;
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return 0;
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}
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protected static String esc(String s) {
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if (s == null) return "";
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return s.replace("&", "&").replace("<", "<").replace(">", ">").replace("\"", """);
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}
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protected static String stripExt(String n) {
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int i = n.lastIndexOf('.');
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return i > 0 ? n.substring(0, i) : n;
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}
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protected static String sanitize(String n) {
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return n.replaceAll("[^A-Za-z0-9_-]", "_");
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}
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/** Base de nom unique et ordonnée, ex. "03_mon_manuel". */
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protected String safeBase(Path source, int order) {
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return String.format("%02d_%s", order, sanitize(stripExt(source.getFileName().toString())));
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}
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protected String wrapHtml(String title, String body) {
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return "<!DOCTYPE html>\n<html lang=\"fr\"><head>\n"
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+ "<meta charset=\"UTF-8\"/>\n"
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+ "<title>" + esc(title) + "</title>\n"
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+ "<link rel=\"stylesheet\" href=\"styles.css\"/>\n"
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+ "</head>\n<body>\n" + body + "\n</body></html>";
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}
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protected void writeHtml(String fileName, String title, String body) throws IOException {
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Files.write(outputDir.resolve(fileName), wrapHtml(title, body).getBytes(StandardCharsets.UTF_8));
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}
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/** Écrit une image binaire (extraite d'un document) et renvoie son chemin relatif. */
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protected String writeImageBytes(String safe, int idx, String ext, byte[] data) throws IOException {
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String name = "images/" + safe + "_img" + idx + "." + ext;
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Path target = outputDir.resolve(name);
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Files.createDirectories(target.getParent());
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Files.write(target, data);
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return name;
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}
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/** Écrit une image PNG (rendu d'une diapositive) et renvoie son chemin relatif. */
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protected String writeImagePng(String safe, int idx, BufferedImage img) throws IOException {
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String name = "images/" + safe + "_img" + idx + ".png";
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Path target = outputDir.resolve(name);
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Files.createDirectories(target.getParent());
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try (OutputStream os = Files.newOutputStream(target)) {
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ImageIO.write(img, "png", os);
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}
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return name;
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}
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/** Réglages de rendu de qualité pour la peinture des diapositives. */
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protected static void applyQualityHints(Graphics2D g) {
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g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
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g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
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g.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
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g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
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}
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}
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