CallOverlay.svelte

<script lang="ts">
	import { config, settings, showCallOverlay } from '$lib/stores';
	import { onMount, tick, getContext } from 'svelte';

	import {
		blobToFile,
		calculateSHA256,
		extractSentencesForAudio,
		findWordIndices
	} from '$lib/utils';
	import { generateEmoji } from '$lib/apis';
	import { synthesizeOpenAISpeech, transcribeAudio } from '$lib/apis/audio';

	import { toast } from 'svelte-sonner';

	import Tooltip from '$lib/components/common/Tooltip.svelte';
	import VideoInputMenu from './CallOverlay/VideoInputMenu.svelte';

	const i18n = getContext('i18n');

	export let eventTarget: EventTarget;

	export let submitPrompt: Function;
	export let stopResponse: Function;

	export let files;

	export let chatId;
	export let modelId;

	let loading = false;
	let confirmed = false;
	let interrupted = false;
	let assistantSpeaking = false;

	let emoji = null;

	let camera = false;
	let cameraStream = null;

	let chatStreaming = false;

	let rmsLevel = 0;
	let hasStartedSpeaking = false;
	let mediaRecorder;
	let audioChunks = [];

	let videoInputDevices = [];
	let selectedVideoInputDeviceId = null;

	const getVideoInputDevices = async () => {
		const devices = await navigator.mediaDevices.enumerateDevices();
		videoInputDevices = devices.filter((device) => device.kind === 'videoinput');

		if (!!navigator.mediaDevices.getDisplayMedia) {
			videoInputDevices = [
				...videoInputDevices,
				{
					deviceId: 'screen',
					label: 'Screen Share'
				}
			];
		}

		console.log(videoInputDevices);
		if (selectedVideoInputDeviceId === null && videoInputDevices.length > 0) {
			selectedVideoInputDeviceId = videoInputDevices[0].deviceId;
		}
	};

	const startCamera = async () => {
		await getVideoInputDevices();

		if (cameraStream === null) {
			camera = true;
			await tick();
			try {
				await startVideoStream();
			} catch (err) {
				console.error('Error accessing webcam: ', err);
			}
		}
	};

	const startVideoStream = async () => {
		const video = document.getElementById('camera-feed');
		if (video) {
			if (selectedVideoInputDeviceId === 'screen') {
				cameraStream = await navigator.mediaDevices.getDisplayMedia({
					video: {
						cursor: 'always'
					},
					audio: false
				});
			} else {
				cameraStream = await navigator.mediaDevices.getUserMedia({
					video: {
						deviceId: selectedVideoInputDeviceId ? { exact: selectedVideoInputDeviceId } : undefined
					}
				});
			}

			if (cameraStream) {
				await getVideoInputDevices();
				video.srcObject = cameraStream;
				await video.play();
			}
		}
	};

	const stopVideoStream = async () => {
		if (cameraStream) {
			const tracks = cameraStream.getTracks();
			tracks.forEach((track) => track.stop());
		}

		cameraStream = null;
	};

	const takeScreenshot = () => {
		const video = document.getElementById('camera-feed');
		const canvas = document.getElementById('camera-canvas');

		if (!canvas) {
			return;
		}

		const context = canvas.getContext('2d');

		// Make the canvas match the video dimensions
		canvas.width = video.videoWidth;
		canvas.height = video.videoHeight;

		// Draw the image from the video onto the canvas
		context.drawImage(video, 0, 0, video.videoWidth, video.videoHeight);

		// Convert the canvas to a data base64 URL and console log it
		const dataURL = canvas.toDataURL('image/png');
		console.log(dataURL);

		return dataURL;
	};

	const stopCamera = async () => {
		await stopVideoStream();
		camera = false;
	};

	const MIN_DECIBELS = -55;
	const VISUALIZER_BUFFER_LENGTH = 300;

	const transcribeHandler = async (audioBlob) => {
		// Create a blob from the audio chunks

		await tick();
		const file = blobToFile(audioBlob, 'recording.wav');

		const res = await transcribeAudio(localStorage.token, file).catch((error) => {
			toast.error(error);
			return null;
		});

		if (res) {
			console.log(res.text);

			if (res.text !== '') {
				const _responses = await submitPrompt(res.text, { _raw: true });
				console.log(_responses);
			}
		}
	};

	const stopRecordingCallback = async (_continue = true) => {
		if ($showCallOverlay) {
			console.log('%c%s', 'color: red; font-size: 20px;', '🚨 stopRecordingCallback 🚨');

			// deep copy the audioChunks array
			const _audioChunks = audioChunks.slice(0);

			audioChunks = [];
			mediaRecorder = false;

			if (_continue) {
				startRecording();
			}

			if (confirmed) {
				loading = true;
				emoji = null;

				if (cameraStream) {
					const imageUrl = takeScreenshot();

					files = [
						{
							type: 'image',
							url: imageUrl
						}
					];
				}

				const audioBlob = new Blob(_audioChunks, { type: 'audio/wav' });
				await transcribeHandler(audioBlob);

				confirmed = false;
				loading = false;
			}
		} else {
			audioChunks = [];
			mediaRecorder = false;
		}
	};

	const startRecording = async () => {
		const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
		mediaRecorder = new MediaRecorder(stream);

		mediaRecorder.onstart = () => {
			console.log('Recording started');
			audioChunks = [];
			analyseAudio(stream);
		};

		mediaRecorder.ondataavailable = (event) => {
			if (hasStartedSpeaking) {
				audioChunks.push(event.data);
			}
		};

		mediaRecorder.onstop = (e) => {
			console.log('Recording stopped', e);
			stopRecordingCallback();
		};

		mediaRecorder.start();
	};

	// Function to calculate the RMS level from time domain data
	const calculateRMS = (data: Uint8Array) => {
		let sumSquares = 0;
		for (let i = 0; i < data.length; i++) {
			const normalizedValue = (data[i] - 128) / 128; // Normalize the data
			sumSquares += normalizedValue * normalizedValue;
		}
		return Math.sqrt(sumSquares / data.length);
	};

	const analyseAudio = (stream) => {
		const audioContext = new AudioContext();
		const audioStreamSource = audioContext.createMediaStreamSource(stream);

		const analyser = audioContext.createAnalyser();
		analyser.minDecibels = MIN_DECIBELS;
		audioStreamSource.connect(analyser);

		const bufferLength = analyser.frequencyBinCount;

		const domainData = new Uint8Array(bufferLength);
		const timeDomainData = new Uint8Array(analyser.fftSize);

		let lastSoundTime = Date.now();
		hasStartedSpeaking = false;

		console.log('🔊 Sound detection started', lastSoundTime, hasStartedSpeaking);

		const detectSound = () => {
			const processFrame = () => {
				if (!mediaRecorder || !$showCallOverlay) {
					return;
				}

				if (assistantSpeaking) {
					analyser.maxDecibels = 0;
					analyser.minDecibels = -10;
				} else {
					analyser.minDecibels = MIN_DECIBELS;
					analyser.maxDecibels = -30;
				}

				analyser.getByteTimeDomainData(timeDomainData);
				analyser.getByteFrequencyData(domainData);

				// Calculate RMS level from time domain data
				rmsLevel = calculateRMS(timeDomainData);

				// Check if initial speech/noise has started
				const hasSound = domainData.some((value) => value > 0);
				if (hasSound) {
					// BIG RED TEXT
					console.log('%c%s', 'color: red; font-size: 20px;', '🔊 Sound detected');

					if (!hasStartedSpeaking) {
						hasStartedSpeaking = true;
						stopAllAudio();
					}

					lastSoundTime = Date.now();
				}

				// Start silence detection only after initial speech/noise has been detected
				if (hasStartedSpeaking) {
					if (Date.now() - lastSoundTime > 2000) {
						confirmed = true;

						if (mediaRecorder) {
							console.log('%c%s', 'color: red; font-size: 20px;', '🔇 Silence detected');
							mediaRecorder.stop();
							return;
						}
					}
				}

				window.requestAnimationFrame(processFrame);
			};

			window.requestAnimationFrame(processFrame);
		};

		detectSound();
	};

	let finishedMessages = {};
	let currentMessageId = null;
	let currentUtterance = null;

	const speakSpeechSynthesisHandler = (content) => {
		if ($showCallOverlay) {
			return new Promise((resolve) => {
				let voices = [];
				const getVoicesLoop = setInterval(async () => {
					voices = await speechSynthesis.getVoices();
					if (voices.length > 0) {
						clearInterval(getVoicesLoop);

						const voice =
							voices
								?.filter(
									(v) => v.voiceURI === ($settings?.audio?.tts?.voice ?? $config?.audio?.tts?.voice)
								)
								?.at(0) ?? undefined;

						currentUtterance = new SpeechSynthesisUtterance(content);

						if (voice) {
							currentUtterance.voice = voice;
						}

						speechSynthesis.speak(currentUtterance);
						currentUtterance.onend = async (e) => {
							await new Promise((r) => setTimeout(r, 200));
							resolve(e);
						};
					}
				}, 100);
			});
		} else {
			return Promise.resolve();
		}
	};

	const playAudio = (audio) => {
		if ($showCallOverlay) {
			return new Promise((resolve) => {
				const audioElement = document.getElementById('audioElement');

				if (audioElement) {
					audioElement.src = audio.src;
					audioElement.muted = true;

					audioElement
						.play()
						.then(() => {
							audioElement.muted = false;
						})
						.catch((error) => {
							console.error(error);
						});

					audioElement.onended = async (e) => {
						await new Promise((r) => setTimeout(r, 100));
						resolve(e);
					};
				}
			});
		} else {
			return Promise.resolve();
		}
	};

	const stopAllAudio = async () => {
		assistantSpeaking = false;
		interrupted = true;

		if (chatStreaming) {
			stopResponse();
		}

		if (currentUtterance) {
			speechSynthesis.cancel();
			currentUtterance = null;
		}

		const audioElement = document.getElementById('audioElement');
		if (audioElement) {
			audioElement.muted = true;
			audioElement.pause();
			audioElement.currentTime = 0;
		}
	};

	let audioAbortController = new AbortController();

	// Audio cache map where key is the content and value is the Audio object.
	const audioCache = new Map();
	const emojiCache = new Map();

	const fetchAudio = async (content) => {
		if (!audioCache.has(content)) {
			try {
				// Set the emoji for the content if needed
				if ($settings?.showEmojiInCall ?? false) {
					const emoji = await generateEmoji(localStorage.token, modelId, content, chatId);
					if (emoji) {
						emojiCache.set(content, emoji);
					}
				}

				if ($config.audio.tts.engine !== '') {
					const res = await synthesizeOpenAISpeech(
						localStorage.token,
						$settings?.audio?.tts?.voice ?? $config?.audio?.tts?.voice,
						content
					).catch((error) => {
						console.error(error);
						return null;
					});

					if (res) {
						const blob = await res.blob();
						const blobUrl = URL.createObjectURL(blob);
						audioCache.set(content, new Audio(blobUrl));
					}
				} else {
					audioCache.set(content, true);
				}
			} catch (error) {
				console.error('Error synthesizing speech:', error);
			}
		}

		return audioCache.get(content);
	};

	let messages = {};

	const monitorAndPlayAudio = async (id, signal) => {
		while (!signal.aborted) {
			if (messages[id] && messages[id].length > 0) {
				// Retrieve the next content string from the queue
				const content = messages[id].shift(); // Dequeues the content for playing

				if (audioCache.has(content)) {
					// If content is available in the cache, play it

					// Set the emoji for the content if available
					if (($settings?.showEmojiInCall ?? false) && emojiCache.has(content)) {
						emoji = emojiCache.get(content);
					} else {
						emoji = null;
					}

					if ($config.audio.tts.engine !== '') {
						try {
							console.log(
								'%c%s',
								'color: red; font-size: 20px;',
								`Playing audio for content: ${content}`
							);

							const audio = audioCache.get(content);
							await playAudio(audio); // Here ensure that playAudio is indeed correct method to execute
							console.log(`Played audio for content: ${content}`);
							await new Promise((resolve) => setTimeout(resolve, 200)); // Wait before retrying to reduce tight loop
						} catch (error) {
							console.error('Error playing audio:', error);
						}
					} else {
						await speakSpeechSynthesisHandler(content);
					}
				} else {
					// If not available in the cache, push it back to the queue and delay
					messages[id].unshift(content); // Re-queue the content at the start
					console.log(`Audio for "${content}" not yet available in the cache, re-queued...`);
					await new Promise((resolve) => setTimeout(resolve, 200)); // Wait before retrying to reduce tight loop
				}
			} else if (finishedMessages[id] && messages[id] && messages[id].length === 0) {
				// If the message is finished and there are no more messages to process, break the loop
				assistantSpeaking = false;
				break;
			} else {
				// No messages to process, sleep for a bit
				await new Promise((resolve) => setTimeout(resolve, 200));
			}
		}
		console.log(`Audio monitoring and playing stopped for message ID ${id}`);
	};

	onMount(async () => {
		startRecording();

		const chatStartHandler = async (e) => {
			const { id } = e.detail;

			chatStreaming = true;

			if (currentMessageId !== id) {
				console.log(`Received chat start event for message ID ${id}`);

				currentMessageId = id;
				if (audioAbortController) {
					audioAbortController.abort();
				}
				audioAbortController = new AbortController();

				assistantSpeaking = true;
				// Start monitoring and playing audio for the message ID
				monitorAndPlayAudio(id, audioAbortController.signal);
			}
		};

		const chatEventHandler = async (e) => {
			const { id, content } = e.detail;
			// "id" here is message id
			// if "id" is not the same as "currentMessageId" then do not process
			// "content" here is a sentence from the assistant,
			// there will be many sentences for the same "id"

			if (currentMessageId === id) {
				console.log(`Received chat event for message ID ${id}: ${content}`);

				try {
					if (messages[id] === undefined) {
						messages[id] = [content];
					} else {
						messages[id].push(content);
					}

					console.log(content);

					fetchAudio(content);
				} catch (error) {
					console.error('Failed to fetch or play audio:', error);
				}
			}
		};

		const chatFinishHandler = async (e) => {
			const { id, content } = e.detail;
			// "content" here is the entire message from the assistant
			finishedMessages[id] = true;

			chatStreaming = false;
		};

		eventTarget.addEventListener('chat:start', chatStartHandler);
		eventTarget.addEventListener('chat', chatEventHandler);
		eventTarget.addEventListener('chat:finish', chatFinishHandler);

		return async () => {
			eventTarget.removeEventListener('chat:start', chatStartHandler);
			eventTarget.removeEventListener('chat', chatEventHandler);
			eventTarget.removeEventListener('chat:finish', chatFinishHandler);

			audioAbortController.abort();
			await tick();

			await stopAllAudio();

			await stopRecordingCallback(false);
			await stopCamera();
		};
	});
</script>

{#if $showCallOverlay}
	<div class=" absolute w-full h-screen max-h-[100dvh] flex z-[999] overflow-hidden">
		<div
			class="absolute w-full h-screen max-h-[100dvh] bg-white text-gray-700 dark:bg-black dark:text-gray-300 flex justify-center"
		>
			<div class="max-w-lg w-full h-screen max-h-[100dvh] flex flex-col justify-between p-3 md:p-6">
				{#if camera}
					<button
						type="button"
						class="flex justify-center items-center w-full h-20 min-h-20"
						on:click={() => {
							if (assistantSpeaking) {
								stopAllAudio();
							}
						}}
					>
						{#if emoji}
							<div
								class="  transition-all rounded-full"
								style="font-size:{rmsLevel * 100 > 4
									? '4.5'
									: rmsLevel * 100 > 2
									? '4.25'
									: rmsLevel * 100 > 1
									? '3.75'
									: '3.5'}rem;width: 100%; text-align:center;"
							>
								{emoji}
							</div>
						{:else if loading}
							<svg
								class="size-12 text-gray-900 dark:text-gray-400"
								viewBox="0 0 24 24"
								fill="currentColor"
								xmlns="http://www.w3.org/2000/svg"
								><style>
									.spinner_qM83 {
										animation: spinner_8HQG 1.05s infinite;
									}
									.spinner_oXPr {
										animation-delay: 0.1s;
									}
									.spinner_ZTLf {
										animation-delay: 0.2s;
									}
									@keyframes spinner_8HQG {
										0%,
										57.14% {
											animation-timing-function: cubic-bezier(0.33, 0.66, 0.66, 1);
											transform: translate(0);
										}
										28.57% {
											animation-timing-function: cubic-bezier(0.33, 0, 0.66, 0.33);
											transform: translateY(-6px);
										}
										100% {
											transform: translate(0);
										}
									}
								</style><circle class="spinner_qM83" cx="4" cy="12" r="3" /><circle
									class="spinner_qM83 spinner_oXPr"
									cx="12"
									cy="12"
									r="3"
								/><circle class="spinner_qM83 spinner_ZTLf" cx="20" cy="12" r="3" /></svg
							>
						{:else}
							<div
								class=" {rmsLevel * 100 > 4
									? ' size-[4.5rem]'
									: rmsLevel * 100 > 2
									? ' size-16'
									: rmsLevel * 100 > 1
									? 'size-14'
									: 'size-12'}  transition-all bg-black dark:bg-white rounded-full"
							/>
						{/if}
						<!-- navbar -->
					</button>
				{/if}

				<div class="flex justify-center items-center flex-1 h-full w-full max-h-full">
					{#if !camera}
						<button
							type="button"
							on:click={() => {
								if (assistantSpeaking) {
									stopAllAudio();
								}
							}}
						>
							{#if emoji}
								<div
									class="  transition-all rounded-full"
									style="font-size:{rmsLevel * 100 > 4
										? '13'
										: rmsLevel * 100 > 2
										? '12'
										: rmsLevel * 100 > 1
										? '11.5'
										: '11'}rem;width:100%;text-align:center;"
								>
									{emoji}
								</div>
							{:else if loading}
								<svg
									class="size-44 text-gray-900 dark:text-gray-400"
									viewBox="0 0 24 24"
									fill="currentColor"
									xmlns="http://www.w3.org/2000/svg"
									><style>
										.spinner_qM83 {
											animation: spinner_8HQG 1.05s infinite;
										}
										.spinner_oXPr {
											animation-delay: 0.1s;
										}
										.spinner_ZTLf {
											animation-delay: 0.2s;
										}
										@keyframes spinner_8HQG {
											0%,
											57.14% {
												animation-timing-function: cubic-bezier(0.33, 0.66, 0.66, 1);
												transform: translate(0);
											}
											28.57% {
												animation-timing-function: cubic-bezier(0.33, 0, 0.66, 0.33);
												transform: translateY(-6px);
											}
											100% {
												transform: translate(0);
											}
										}
									</style><circle class="spinner_qM83" cx="4" cy="12" r="3" /><circle
										class="spinner_qM83 spinner_oXPr"
										cx="12"
										cy="12"
										r="3"
									/><circle class="spinner_qM83 spinner_ZTLf" cx="20" cy="12" r="3" /></svg
								>
							{:else}
								<div
									class=" {rmsLevel * 100 > 4
										? ' size-52'
										: rmsLevel * 100 > 2
										? 'size-48'
										: rmsLevel * 100 > 1
										? 'size-[11.5rem]'
										: 'size-44'}  transition-all bg-black dark:bg-white rounded-full"
								/>
							{/if}
						</button>
					{:else}
						<div
							class="relative flex video-container w-full max-h-full pt-2 pb-4 md:py-6 px-2 h-full"
						>
							<video
								id="camera-feed"
								autoplay
								class="rounded-2xl h-full min-w-full object-cover object-center"
								playsinline
							/>

							<canvas id="camera-canvas" style="display:none;" />

							<div class=" absolute top-4 md:top-8 left-4">
								<button
									type="button"
									class="p-1.5 text-white cursor-pointer backdrop-blur-xl bg-black/10 rounded-full"
									on:click={() => {
										stopCamera();
									}}
								>
									<svg
										xmlns="http://www.w3.org/2000/svg"
										viewBox="0 0 16 16"
										fill="currentColor"
										class="size-6"
									>
										<path
											d="M5.28 4.22a.75.75 0 0 0-1.06 1.06L6.94 8l-2.72 2.72a.75.75 0 1 0 1.06 1.06L8 9.06l2.72 2.72a.75.75 0 1 0 1.06-1.06L9.06 8l2.72-2.72a.75.75 0 0 0-1.06-1.06L8 6.94 5.28 4.22Z"
										/>
									</svg>
								</button>
							</div>
						</div>
					{/if}
				</div>

				<div class="flex justify-between items-center pb-2 w-full">
					<div>
						{#if camera}
							<VideoInputMenu
								devices={videoInputDevices}
								on:change={async (e) => {
									console.log(e.detail);
									selectedVideoInputDeviceId = e.detail;
									await stopVideoStream();
									await startVideoStream();
								}}
							>
								<button class=" p-3 rounded-full bg-gray-50 dark:bg-gray-900" type="button">
									<svg
										xmlns="http://www.w3.org/2000/svg"
										viewBox="0 0 20 20"
										fill="currentColor"
										class="size-5"
									>
										<path
											fill-rule="evenodd"
											d="M15.312 11.424a5.5 5.5 0 0 1-9.201 2.466l-.312-.311h2.433a.75.75 0 0 0 0-1.5H3.989a.75.75 0 0 0-.75.75v4.242a.75.75 0 0 0 1.5 0v-2.43l.31.31a7 7 0 0 0 11.712-3.138.75.75 0 0 0-1.449-.39Zm1.23-3.723a.75.75 0 0 0 .219-.53V2.929a.75.75 0 0 0-1.5 0V5.36l-.31-.31A7 7 0 0 0 3.239 8.188a.75.75 0 1 0 1.448.389A5.5 5.5 0 0 1 13.89 6.11l.311.31h-2.432a.75.75 0 0 0 0 1.5h4.243a.75.75 0 0 0 .53-.219Z"
											clip-rule="evenodd"
										/>
									</svg>
								</button>
							</VideoInputMenu>
						{:else}
							<Tooltip content={$i18n.t('Camera')}>
								<button
									class=" p-3 rounded-full bg-gray-50 dark:bg-gray-900"
									type="button"
									on:click={async () => {
										await navigator.mediaDevices.getUserMedia({ video: true });
										startCamera();
									}}
								>
									<svg
										xmlns="http://www.w3.org/2000/svg"
										fill="none"
										viewBox="0 0 24 24"
										stroke-width="1.5"
										stroke="currentColor"
										class="size-5"
									>
										<path
											stroke-linecap="round"
											stroke-linejoin="round"
											d="M6.827 6.175A2.31 2.31 0 0 1 5.186 7.23c-.38.054-.757.112-1.134.175C2.999 7.58 2.25 8.507 2.25 9.574V18a2.25 2.25 0 0 0 2.25 2.25h15A2.25 2.25 0 0 0 21.75 18V9.574c0-1.067-.75-1.994-1.802-2.169a47.865 47.865 0 0 0-1.134-.175 2.31 2.31 0 0 1-1.64-1.055l-.822-1.316a2.192 2.192 0 0 0-1.736-1.039 48.774 48.774 0 0 0-5.232 0 2.192 2.192 0 0 0-1.736 1.039l-.821 1.316Z"
										/>
										<path
											stroke-linecap="round"
											stroke-linejoin="round"
											d="M16.5 12.75a4.5 4.5 0 1 1-9 0 4.5 4.5 0 0 1 9 0ZM18.75 10.5h.008v.008h-.008V10.5Z"
										/>
									</svg>
								</button>
							</Tooltip>
						{/if}
					</div>

					<div>
						<button
							type="button"
							on:click={() => {
								if (assistantSpeaking) {
									stopAllAudio();
								}
							}}
						>
							<div class=" line-clamp-1 text-sm font-medium">
								{#if loading}
									{$i18n.t('Thinking...')}
								{:else if assistantSpeaking}
									{$i18n.t('Tap to interrupt')}
								{:else}
									{$i18n.t('Listening...')}
								{/if}
							</div>
						</button>
					</div>

					<div>
						<button
							class=" p-3 rounded-full bg-gray-50 dark:bg-gray-900"
							on:click={async () => {
								showCallOverlay.set(false);
							}}
							type="button"
						>
							<svg
								xmlns="http://www.w3.org/2000/svg"
								viewBox="0 0 20 20"
								fill="currentColor"
								class="size-5"
							>
								<path
									d="M6.28 5.22a.75.75 0 0 0-1.06 1.06L8.94 10l-3.72 3.72a.75.75 0 1 0 1.06 1.06L10 11.06l3.72 3.72a.75.75 0 1 0 1.06-1.06L11.06 10l3.72-3.72a.75.75 0 0 0-1.06-1.06L10 8.94 6.28 5.22Z"
								/>
							</svg>
						</button>
					</div>
				</div>
			</div>
		</div>
	</div>
{/if}