Merge pull request #3868 from YunZLu/staging

Fix Edge Browser TTS Compatibility

public/scripts/extensions/tts/system.js

@@ -79,6 +79,10 @@ class SystemTtsProvider {
     // Config //
     //########//
 
+    // Static constants for the simulated default voice
+    static BROWSER_DEFAULT_VOICE_ID = '__browser_default__';
+    static BROWSER_DEFAULT_VOICE_NAME = 'System Default Voice';
+
     settings;
     ready = false;
     voices = [];
@@ -168,51 +172,97 @@ class SystemTtsProvider {
     //#################//
     fetchTtsVoiceObjects() {
         if (!('speechSynthesis' in window)) {
-            return [];
+            return Promise.resolve([]);
         }
 
         return new Promise((resolve) => {
             setTimeout(() => {
-                const voices = speechSynthesis
+                let voices = speechSynthesis.getVoices();
-                    .getVoices()
+
+                if (voices.length === 0) {
+                    // Edge compat: Provide default when voices empty
+                    console.warn('SystemTTS: getVoices() returned empty list. Providing browser default option.');
+                    const defaultVoice = {
+                        name: SystemTtsProvider.BROWSER_DEFAULT_VOICE_NAME,
+                        voice_id: SystemTtsProvider.BROWSER_DEFAULT_VOICE_ID,
+                        preview_url: false,
+                        lang: navigator.language || 'en-US',
+                    };
+                    resolve([defaultVoice]);
+                } else {
+                    const mappedVoices = voices
                         .sort((a, b) => a.lang.localeCompare(b.lang) || a.name.localeCompare(b.name))
                         .map(x => ({ name: x.name, voice_id: x.voiceURI, preview_url: false, lang: x.lang }));
-
+                    resolve(mappedVoices);
-                resolve(voices);
+                }
-            }, 1);
+            }, 50);
         });
     }
 
     previewTtsVoice(voiceId) {
         if (!('speechSynthesis' in window)) {
-            throw 'Speech synthesis API is not supported';
+            throw new Error('Speech synthesis API is not supported');
         }
 
-        const voice = speechSynthesis.getVoices().find(x => x.voiceURI === voiceId);
+        let voice = null;
+        if (voiceId !== SystemTtsProvider.BROWSER_DEFAULT_VOICE_ID) {
+            const voices = speechSynthesis.getVoices();
+            voice = voices.find(x => x.voiceURI === voiceId);
 
-        if (!voice) {
+            if (!voice && voices.length > 0) {
-            throw `TTS Voice id ${voiceId} not found`;
+                console.warn(`SystemTTS Preview: Voice ID "${voiceId}" not found among available voices. Using browser default.`);
+            } else if (!voice && voices.length === 0) {
+                console.warn('SystemTTS Preview: Voice list is empty. Using browser default.');
+            }
+        } else {
+            console.log('SystemTTS Preview: Using browser default voice as requested.');
         }
 
         speechSynthesis.cancel();
-        const text = getPreviewString(voice.lang);
+        const langForPreview = voice ? voice.lang : (navigator.language || 'en-US');
+        const text = getPreviewString(langForPreview);
         const utterance = new SpeechSynthesisUtterance(text);
+
+        if (voice) {
             utterance.voice = voice;
+        }
+
         utterance.rate = this.settings.rate || 1;
         utterance.pitch = this.settings.pitch || 1;
+
+        utterance.onerror = (event) => {
+            console.error(`SystemTTS Preview Error: ${event.error}`, event);
+        };
+
         speechSynthesis.speak(utterance);
     }
 
     async getVoice(voiceName) {
         if (!('speechSynthesis' in window)) {
-            return { voice_id: null };
+            return { voice_id: null, name: 'API Not Supported' };
+        }
+
+        if (voiceName === SystemTtsProvider.BROWSER_DEFAULT_VOICE_NAME) {
+            return {
+                voice_id: SystemTtsProvider.BROWSER_DEFAULT_VOICE_ID,
+                name: SystemTtsProvider.BROWSER_DEFAULT_VOICE_NAME,
+            };
         }
 
         const voices = speechSynthesis.getVoices();
+
+        if (voices.length === 0) {
+            console.warn('SystemTTS: Empty voice list, using default fallback');
+            return {
+                voice_id: SystemTtsProvider.BROWSER_DEFAULT_VOICE_ID,
+                name: SystemTtsProvider.BROWSER_DEFAULT_VOICE_NAME,
+            };
+        }
+
         const match = voices.find(x => x.name == voiceName);
 
         if (!match) {
-            throw `TTS Voice name ${voiceName} not found`;
+            throw new Error(`SystemTTS getVoice: TTS Voice name "${voiceName}" not found`);
         }
 
         return { voice_id: match.voiceURI, name: match.name };
@@ -237,7 +287,6 @@ class SystemTtsProvider {
             speechUtteranceChunker(utterance, {
                 chunkLength: 200,
             }, function () {
-                //some code to execute when done
                 resolve(silence);
                 console.log('System TTS done');
             });