FEATURE Optimizing article reader behaviour

resources/js/singles/reader.ts

@@ -18,8 +18,7 @@ const DEFAULT_CONFIG: ReaderConfig = {
   pitch: 1.1,
   volume: 1,
   highlightColor: '#f1fcf9',
-  highlightStyle:
-    'background-color: #f1fcf9; padding: 2px 4px; border-radius: 3px; color: #136F63;',
+  highlightStyle: 'background-color: #136F63; padding: 2px 4px; border-radius: 3px; color:white;',
 };
 
 export default function handleArticleReader() {
@@ -31,8 +30,6 @@ export default function handleArticleReader() {
   let utterance: SpeechSynthesisUtterance;
   let voices: SpeechSynthesisVoice[] = [];
   let thomasVoice: SpeechSynthesisVoice | null = null;
-  let originalContent = '';
-  let words: string[] = [];
   let currentWordIndex = 0;
 
   /* ********************************************************
@@ -77,37 +74,132 @@ export default function handleArticleReader() {
     }
   }
 
-  // Fonctions de highlighting
-  function highlightWord(index: number): void {
-    if (!article || index >= words.length) return;
+  // ✅ HIGHLIGHTING AVANCÉ - Préserve la structure HTML
+  let textNodes: Text[] = [];
+  let wordBoundaries: { node: Text; startOffset: number; endOffset: number; word: string }[] = [];
 
-    // Restaurer le contenu original si c'est le premier mot
-    if (index === 0) {
-      article.innerHTML = originalContent;
-    }
-
-    // Créer le nouveau HTML avec le mot highlighted
-    const highlightedWords = words.map((word, i) => {
-      if (i === index) {
-        return `<span class="speech-highlight" style="${DEFAULT_CONFIG.highlightStyle}">${word}</span>`;
-      }
-      return word;
+  function collectTextNodes(element: Element): Text[] {
+    const nodes: Text[] = [];
+    const walker = document.createTreeWalker(element, NodeFilter.SHOW_TEXT, {
+      acceptNode: (node) => {
+        // Ignorer les nœuds texte vides ou uniquement des espaces
+        return node.textContent?.trim() ? NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_REJECT;
+      },
     });
 
-    article.innerHTML = highlightedWords.join(' ');
+    let node;
+    while ((node = walker.nextNode())) {
+      nodes.push(node as Text);
+    }
+    return nodes;
+  }
+
+  function buildWordBoundaries(): void {
+    wordBoundaries = [];
+    textNodes = collectTextNodes(article as Element);
+
+    textNodes.forEach((textNode) => {
+      const text = textNode.textContent || '';
+      const wordRegex = /\S+/g; // Mots (non-espaces)
+      let match;
+
+      while ((match = wordRegex.exec(text)) !== null) {
+        wordBoundaries.push({
+          node: textNode,
+          startOffset: match.index,
+          endOffset: match.index + match[0].length,
+          word: match[0],
+        });
+      }
+    });
+
+    // 🐛 DEBUG: Afficher les mots détectés
+    console.log(
+      'Mots détectés dans le DOM:',
+      wordBoundaries.map((b) => b.word)
+    );
+  }
+
+  function highlightWord(index: number): void {
+    if (!article || index >= wordBoundaries.length) {
+      console.log('❌ Highlight impossible:', { index, totalWords: wordBoundaries.length });
+      return;
+    }
+
+    // Supprimer le highlight précédent et reconstruire les boundaries
+    removeHighlight();
+    buildWordBoundaries(); // ✅ Recalculer après cleanup
+
+    // Vérifier à nouveau après reconstruction
+    if (index >= wordBoundaries.length) {
+      console.warn('❌ Index invalide après reconstruction:', {
+        index,
+        totalWords: wordBoundaries.length,
+      });
+      return;
+    }
+
+    const boundary = wordBoundaries[index];
+    console.log('🎯 Highlighting mot #' + index + ':', boundary.word);
+
+    // Vérifier que le nœud et les offsets sont encore valides
+    if (!boundary.node || !boundary.node.textContent) {
+      console.warn('❌ Nœud texte invalide');
+      return;
+    }
+
+    if (
+      boundary.startOffset > boundary.node.textContent.length ||
+      boundary.endOffset > boundary.node.textContent.length
+    ) {
+      console.warn('❌ Offsets invalides:', {
+        startOffset: boundary.startOffset,
+        endOffset: boundary.endOffset,
+        nodeLength: boundary.node.textContent.length,
+      });
+      return;
+    }
+
+    try {
+      const range = document.createRange();
+      range.setStart(boundary.node, boundary.startOffset);
+      range.setEnd(boundary.node, boundary.endOffset);
+
+      // Créer le span de highlight
+      const highlightSpan = document.createElement('span');
+      highlightSpan.className = 'speech-highlight';
+      highlightSpan.style.cssText = DEFAULT_CONFIG.highlightStyle;
+
+      range.surroundContents(highlightSpan);
+      console.log('✅ Highlight réussi pour:', boundary.word);
+    } catch (error) {
+      console.warn('⚠️ Erreur lors du highlight:', error, boundary);
+    }
   }
 
   function removeHighlight(): void {
-    if (article && originalContent) {
-      article.innerHTML = originalContent;
-    }
+    if (!article) return;
+
+    const highlights = article.querySelectorAll('.speech-highlight');
+    highlights.forEach((highlight) => {
+      const parent = highlight.parentNode;
+      if (parent) {
+        // Remplacer le span par son contenu
+        while (highlight.firstChild) {
+          parent.insertBefore(highlight.firstChild, highlight);
+        }
+        parent.removeChild(highlight);
+
+        // Normaliser pour fusionner les nœuds texte adjacents
+        parent.normalize();
+      }
+    });
   }
 
   // Création de l'utterance
   function createUtterance(text: string): SpeechSynthesisUtterance {
-    // Sauvegarder le contenu original et préparer les mots
-    originalContent = article ? article.innerHTML : '';
-    words = text.split(/\s+/).filter((word) => word.trim().length > 0);
+    // ✅ Construire la carte des mots avec leur position dans le DOM
+    buildWordBoundaries();
     currentWordIndex = 0;
 
     utterance = new SpeechSynthesisUtterance(text);
@@ -123,9 +215,9 @@ export default function handleArticleReader() {
       utterance.voice = thomasVoice;
     }
 
-    // Event pour highlighter les mots pendant la lecture
+    // ✅ Event pour highlighter les mots pendant la lecture (basé sur les boundaries DOM)
     utterance.onboundary = (event) => {
-      if (event.name === 'word') {
+      if (event.name === 'word' && currentWordIndex < wordBoundaries.length) {
         highlightWord(currentWordIndex);
         currentWordIndex++;
       }