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+/*
+ * Copyright (C) 2021 Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/* global
+ * AudioSystem
+ */
+
+class DisplayAudio {
+ constructor(display) {
+ this._display = display;
+ this._audioPlaying = null;
+ this._audioSystem = new AudioSystem(true);
+ this._autoPlayAudioTimer = null;
+ this._autoPlayAudioDelay = 400;
+ this._eventListeners = new EventListenerCollection();
+ }
+
+ get autoPlayAudioDelay() {
+ return this._autoPlayAudioDelay;
+ }
+
+ set autoPlayAudioDelay(value) {
+ this._autoPlayAudioDelay = value;
+ }
+
+ prepare() {
+ this._audioSystem.prepare();
+ }
+
+ updateOptions(options) {
+ const data = document.documentElement.dataset;
+ data.audioEnabled = `${options.audio.enabled && options.audio.sources.length > 0}`;
+ }
+
+ cleanupEntries() {
+ this.clearAutoPlayTimer();
+ this._eventListeners.removeAllEventListeners();
+ }
+
+ setupEntry(entry, definitionIndex) {
+ for (const button of entry.querySelectorAll('.action-play-audio')) {
+ const expressionIndex = this._getAudioPlayButtonExpressionIndex(button);
+ this._eventListeners.addEventListener(button, 'click', this._onAudioPlayButtonClick.bind(this, definitionIndex, expressionIndex), false);
+ }
+ }
+
+ setupEntriesComplete() {
+ const {audio} = this._display.getOptions();
+ if (!audio.enabled || !audio.autoPlay) { return; }
+
+ this.clearAutoPlayTimer();
+
+ const definitions = this._display.definitions;
+ if (definitions.length === 0) { return; }
+
+ const firstDefinition = definitions[0];
+ if (firstDefinition.type === 'kanji') { return; }
+
+ const callback = () => {
+ this._autoPlayAudioTimer = null;
+ this.playAudio(0, 0);
+ };
+
+ if (this._autoPlayAudioDelay > 0) {
+ this._autoPlayAudioTimer = setTimeout(callback, this._autoPlayAudioDelay);
+ } else {
+ callback();
+ }
+ }
+
+ clearAutoPlayTimer() {
+ if (this._autoPlayAudioTimer === null) { return; }
+ clearTimeout(this._autoPlayAudioTimer);
+ this._autoPlayAudioTimer = null;
+ }
+
+ stopAudio() {
+ if (this._audioPlaying === null) { return; }
+ this._audioPlaying.pause();
+ this._audioPlaying = null;
+ }
+
+ async playAudio(definitionIndex, expressionIndex) {
+ this.stopAudio();
+ this.clearAutoPlayTimer();
+
+ const {definitions} = this._display;
+ if (definitionIndex < 0 || definitionIndex >= definitions.length) { return; }
+
+ const definition = definitions[definitionIndex];
+ if (definition.type === 'kanji') { return; }
+
+ const {expressions} = definition;
+ if (expressionIndex < 0 || expressionIndex >= expressions.length) { return; }
+
+ const {expression, reading} = expressions[expressionIndex];
+ const {sources, textToSpeechVoice, customSourceUrl, volume} = this._display.getOptions().audio;
+
+ const progressIndicatorVisible = this._display.progressIndicatorVisible;
+ const overrideToken = progressIndicatorVisible.setOverride(true);
+ try {
+ // Create audio
+ let audio;
+ let info;
+ try {
+ let index;
+ ({audio, index} = await this._audioSystem.createDefinitionAudio(sources, expression, reading, {textToSpeechVoice, customSourceUrl}));
+ info = `From source ${1 + index}: ${sources[index]}`;
+ } catch (e) {
+ audio = this._audioSystem.getFallbackAudio();
+ info = 'Could not find audio';
+ }
+
+ // Stop any currently playing audio
+ this.stopAudio();
+
+ // Update details
+ for (const button of this._getAudioPlayButtons(definitionIndex, expressionIndex)) {
+ const titleDefault = button.dataset.titleDefault || '';
+ button.title = `${titleDefault}\n${info}`;
+ }
+
+ // Play
+ audio.currentTime = 0;
+ audio.volume = Number.isFinite(volume) ? Math.max(0.0, Math.min(1.0, volume / 100.0)) : 1.0;
+
+ const playPromise = audio.play();
+ this._audioPlaying = audio;
+
+ if (typeof playPromise !== 'undefined') {
+ try {
+ await playPromise;
+ } catch (e) {
+ // NOP
+ }
+ }
+ } finally {
+ progressIndicatorVisible.clearOverride(overrideToken);
+ }
+ }
+
+ // Private
+
+ _onAudioPlayButtonClick(definitionIndex, expressionIndex, e) {
+ e.preventDefault();
+ this.playAudio(definitionIndex, expressionIndex);
+ }
+
+ _getAudioPlayButtonExpressionIndex(button) {
+ const expressionNode = button.closest('.term-expression');
+ if (expressionNode !== null) {
+ const expressionIndex = parseInt(expressionNode.dataset.index, 10);
+ if (Number.isFinite(expressionIndex)) { return expressionIndex; }
+ }
+ return 0;
+ }
+
+ _getAudioPlayButtons(definitionIndex, expressionIndex) {
+ const results = [];
+ const {definitionNodes} = this._display;
+ if (definitionIndex >= 0 && definitionIndex < definitionNodes.length) {
+ const node = definitionNodes[definitionIndex];
+ const button1 = (expressionIndex === 0 ? node.querySelector('.action-play-audio') : null);
+ const button2 = node.querySelector(`.term-expression:nth-of-type(${expressionIndex + 1}) .action-play-audio`);
+ if (button1 !== null) { results.push(button1); }
+ if (button2 !== null) { results.push(button2); }
+ }
+ return results;
+ }
+}