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