Text to Speech (#2)

* Initial TTS scrapping implemented

* Audio & copy buttons added

* TTS langs mapping fix

* Webkit audio api fix

* Added TTS-related testing

* Last tweaks

hooks/index.ts

@@ -1 +1,2 @@
 export { default as useToastOnLoad } from "./useToastOnLoad";
+export { default as useAudioFromBuffer } from "./useAudioFromBuffer";

hooks/useAudioFromBuffer.ts

@@ -0,0 +1,60 @@
+import { useState, useEffect, useRef } from "react";
+
+declare global {
+    interface Window {
+        webkitAudioContext: typeof AudioContext
+    }
+}
+
+const useAudioFromBuffer = (bufferArray?: number[]) => {
+    const audioCtxRef = useRef<AudioContext | null>(null);
+    const [audioSource, setAudioSource] = useState<AudioBufferSourceNode | null>(null);
+    const [audioBuffer, setAudioBuffer] = useState<AudioBuffer | null>(null);
+
+    useEffect(() => {
+        const AudioCtx = window.AudioContext || window.webkitAudioContext;
+        if (!AudioCtx)
+            return;
+        audioCtxRef.current = new AudioCtx();
+        return () => {
+            audioCtxRef.current?.close();
+        }
+    }, []);
+
+    useEffect(() => {
+        if (!bufferArray)
+            return setAudioBuffer(null);
+
+        audioCtxRef.current?.decodeAudioData(
+            new Uint8Array(bufferArray).buffer
+        ).then(setAudioBuffer);
+    }, [bufferArray]);
+
+    const onAudioClick = () => {
+        if (!audioCtxRef.current)
+            return;
+
+        if (!audioSource) {
+            const source = audioCtxRef.current.createBufferSource();
+            source.buffer = audioBuffer;
+            source.connect(audioCtxRef.current.destination);
+            source.start();
+            source.onended = () => {
+                setAudioSource(null);
+            }
+            setAudioSource(source);
+            return;
+        }
+        audioSource.stop();
+        audioSource.disconnect(audioCtxRef.current.destination);
+        setAudioSource(null);
+    };
+
+    return {
+        audioExists: !!audioBuffer,
+        isAudioPlaying: !!audioSource,
+        onAudioClick
+    };
+}
+
+export default useAudioFromBuffer;