From 21a2730cdeef80327285f77a155451a8fbf67939 Mon Sep 17 00:00:00 2001
From: toasted-nutbread <toasted-nutbread@users.noreply.github.com>
Date: Sat, 12 Oct 2019 22:50:22 -0400
Subject: Add option for text-to-speech

---
 ext/bg/js/options.js  |  3 ++-
 ext/bg/js/settings.js | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++
 ext/bg/settings.html  | 11 ++++++++
 ext/mixed/js/audio.js | 13 +++++++++
 4 files changed, 99 insertions(+), 1 deletion(-)

diff --git a/ext/bg/js/options.js b/ext/bg/js/options.js
index fac17d68..4854cd65 100644
--- a/ext/bg/js/options.js
+++ b/ext/bg/js/options.js
@@ -287,7 +287,8 @@ function profileOptionsCreateDefaults() {
             sources: ['jpod101'],
             volume: 100,
             autoPlay: false,
-            customSourceUrl: ''
+            customSourceUrl: '',
+            textToSpeechVoice: ''
         },
 
         scanning: {
diff --git a/ext/bg/js/settings.js b/ext/bg/js/settings.js
index 77815955..debf9f2f 100644
--- a/ext/bg/js/settings.js
+++ b/ext/bg/js/settings.js
@@ -48,6 +48,7 @@ async function formRead(options) {
     options.audio.autoPlay = $('#auto-play-audio').prop('checked');
     options.audio.volume = parseFloat($('#audio-playback-volume').val());
     options.audio.customSourceUrl = $('#audio-custom-source').val();
+    options.audio.textToSpeechVoice = $('#text-to-speech-voice').val();
 
     options.scanning.middleMouse = $('#middle-mouse-button-scan').prop('checked');
     options.scanning.touchInputEnabled = $('#touch-input-enabled').prop('checked');
@@ -119,6 +120,7 @@ async function formWrite(options) {
     $('#auto-play-audio').prop('checked', options.audio.autoPlay);
     $('#audio-playback-volume').val(options.audio.volume);
     $('#audio-custom-source').val(options.audio.customSourceUrl);
+    $('#text-to-speech-voice').val(options.audio.textToSpeechVoice).attr('data-value', options.audio.textToSpeechVoice);
 
     $('#middle-mouse-button-scan').prop('checked', options.scanning.middleMouse);
     $('#touch-input-enabled').prop('checked', options.scanning.touchInputEnabled);
@@ -326,6 +328,77 @@ async function audioSettingsInitialize() {
     const options = await apiOptionsGet(optionsContext);
     audioSourceUI = new AudioSourceUI.Container(options.audio.sources, $('.audio-source-list'), $('.audio-source-add'));
     audioSourceUI.save = () => apiOptionsSave();
+
+    textToSpeechInitialize();
+}
+
+function textToSpeechInitialize() {
+    if (typeof speechSynthesis === 'undefined') { return; }
+
+    speechSynthesis.addEventListener('voiceschanged', () => updateTextToSpeechVoices(), false);
+    updateTextToSpeechVoices();
+
+    $('#text-to-speech-voice-test').on('click', () => textToSpeechTest());
+}
+
+function updateTextToSpeechVoices() {
+    const voices = Array.prototype.map.call(speechSynthesis.getVoices(), (voice, index) => ({voice, index}));
+    voices.sort(textToSpeechVoiceCompare);
+    if (voices.length > 0) {
+        $('#text-to-speech-voice-container').css('display', '');
+    }
+
+    const select = $('#text-to-speech-voice');
+    select.empty();
+    select.append($('<option>').val('').text('None'));
+    for (const {voice} of voices) {
+        select.append($('<option>').val(voice.voiceURI).text(`${voice.name} (${voice.lang})`));
+    }
+
+    select.val(select.attr('data-value'));
+}
+
+function compareLanguageTags(a, b) {
+    if (a.substr(0, 3) === 'ja-') {
+        return (b.substr(0, 3) === 'ja-') ? 0 : -1;
+    } else {
+        return (b.substr(0, 3) === 'ja-') ? 1 : 0;
+    }
+}
+
+function textToSpeechVoiceCompare(a, b) {
+    const i = compareLanguageTags(a.voice.lang, b.voice.lang);
+    if (i !== 0) { return i; }
+
+    if (a.voice.default) {
+        if (!b.voice.default) {
+            return -1;
+        }
+    } else if (b.voice.default) {
+        return 1;
+    }
+
+    if (a.index < b.index) { return -1; }
+    if (a.index > b.index) { return 1; }
+    return 0;
+}
+
+function textToSpeechTest() {
+    try {
+        const text = $('#text-to-speech-voice-test').attr('data-speech-text') || '';
+        const voiceURI = $('#text-to-speech-voice').val();
+        const voice = audioGetTextToSpeechVoice(voiceURI);
+        if (voice === null) { return; }
+
+        const utterance = new SpeechSynthesisUtterance(text);
+        utterance.lang = 'ja-JP';
+        utterance.voice = voice;
+        utterance.volume = 1.0;
+
+        speechSynthesis.speak(utterance);
+    } catch (e) {
+        // NOP
+    }
 }
 
 
diff --git a/ext/bg/settings.html b/ext/bg/settings.html
index ea3e8c18..ffa5533e 100644
--- a/ext/bg/settings.html
+++ b/ext/bg/settings.html
@@ -293,6 +293,16 @@
                     <input type="number" min="0" max="100" id="audio-playback-volume" class="form-control">
                 </div>
 
+                <div class="form-group" style="display: none;" id="text-to-speech-voice-container">
+                    <label for="text-to-speech-voice">Text-to-speech voice</label>
+                    <div class="input-group">
+                        <select class="form-control" id="text-to-speech-voice"></select>
+                        <div class="input-group-btn">
+                            <button class="btn btn-default" id="text-to-speech-voice-test" title="Test voice" data-speech-text="よみちゃん"><span class="glyphicon glyphicon-volume-up"></span></button>
+                        </div>
+                    </div>
+                </div>
+
                 <div class="form-group options-advanced">
                     <label for="audio-custom-source">Custom audio source <span class="label-light">(URL)</span></label>
                     <input type="text" id="audio-custom-source" class="form-control" placeholder="Example: http://localhost/audio.mp3?expression={expression}&reading={reading}">
@@ -658,6 +668,7 @@
         <script src="/bg/js/profile-conditions.js"></script>
         <script src="/bg/js/templates.js"></script>
         <script src="/bg/js/util.js"></script>
+        <script src="/mixed/js/audio.js"></script>
 
         <script src="/bg/js/settings-profiles.js"></script>
         <script src="/bg/js/settings.js"></script>
diff --git a/ext/mixed/js/audio.js b/ext/mixed/js/audio.js
index b905140c..5e3b9164 100644
--- a/ext/mixed/js/audio.js
+++ b/ext/mixed/js/audio.js
@@ -58,3 +58,16 @@ async function audioGetFromSources(expression, sources, optionsContext, createAu
     }
     return {audio: null, source: null};
 }
+
+function audioGetTextToSpeechVoice(voiceURI) {
+    try {
+        for (const voice of speechSynthesis.getVoices()) {
+            if (voice.voiceURI === voiceURI) {
+                return voice;
+            }
+        }
+    } catch (e) {
+        // NOP
+    }
+    return null;
+}
-- 
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