frontend/src/routes/+page.svelte

<script lang="ts">
  import { onMount } from 'svelte';
  import type { Fields, PipelineInfo } from '$lib/types';
  import { PipelineMode } from '$lib/types';
  import ImagePlayer from '$lib/components/ImagePlayer.svelte';
  import VideoInput from '$lib/components/VideoInput.svelte';
  import Button from '$lib/components/Button.svelte';
  import PipelineOptions from '$lib/components/PipelineOptions.svelte';
  import Spinner from '$lib/icons/spinner.svelte';
  import Warning from '$lib/components/Warning.svelte';
  import { lcmLiveStatus, lcmLiveActions, LCMLiveStatus } from '$lib/lcmLive';
  import { mediaStreamActions, onFrameChangeStore } from '$lib/mediaStream';
  import { getPipelineValues, deboucedPipelineValues } from '$lib/store';

  let pipelineParams: Fields;
  let pipelineInfo: PipelineInfo;
  let pageContent: string;
  let isImageMode: boolean = false;
  let maxQueueSize: number = 0;
  let currentQueueSize: number = 0;
  let queueCheckerRunning: boolean = false;
  let warningMessage: string = '';
  onMount(() => {
    getSettings();
  });

  async function getSettings() {
    const settings = await fetch('/api/settings').then((r) => r.json());
    pipelineParams = settings.input_params.properties;
    pipelineInfo = settings.info.properties;
    isImageMode = pipelineInfo.input_mode.default === PipelineMode.IMAGE;
    maxQueueSize = settings.max_queue_size;
    pageContent = settings.page_content;
    console.log(pipelineParams);
    toggleQueueChecker(true);
  }
  function toggleQueueChecker(start: boolean) {
    queueCheckerRunning = start && maxQueueSize > 0;
    if (start) {
      getQueueSize();
    }
  }
  async function getQueueSize() {
    if (!queueCheckerRunning) {
      return;
    }
    const data = await fetch('/api/queue').then((r) => r.json());
    currentQueueSize = data.queue_size;
    setTimeout(getQueueSize, 10000);
  }

  function getSreamdata() {
    if (isImageMode) {
      return [getPipelineValues(), $onFrameChangeStore?.blob];
    } else {
      return [$deboucedPipelineValues];
    }
  }

  $: isLCMRunning = $lcmLiveStatus !== LCMLiveStatus.DISCONNECTED && 
                 $lcmLiveStatus !== LCMLiveStatus.ERROR;
  $: isConnecting = $lcmLiveStatus === LCMLiveStatus.CONNECTING;
                 
  $: {
    // Set warning messages based on lcmLiveStatus
    if ($lcmLiveStatus === LCMLiveStatus.TIMEOUT) {
      warningMessage = 'Session timed out. Please try again.';
    } else if ($lcmLiveStatus === LCMLiveStatus.ERROR) {
      warningMessage = 'Connection error occurred. Please try again.';
    }
  }
  let disabled = false;
  async function toggleLcmLive() {
    try {
      if (!isLCMRunning) {
        if (isConnecting) {
          return; // Don't allow multiple connection attempts
        }
        
        // Clear any previous warning messages
        warningMessage = '';
        disabled = true;
        
        try {
          if (isImageMode) {
            await mediaStreamActions.enumerateDevices();
            await mediaStreamActions.start();
          }
          
          await lcmLiveActions.start(getSreamdata);
          toggleQueueChecker(false);
        } finally {
          // Always re-enable the button even if there was an error
          disabled = false;
        }
      } else {
        // Handle stopping - disable button during this process too
        disabled = true;
        
        try {
          if (isImageMode) {
            mediaStreamActions.stop();
          }
          await lcmLiveActions.stop();
          toggleQueueChecker(true);
        } finally {
          disabled = false;
        }
      }
    } catch (e) {
      console.error('Error in toggleLcmLive:', e);
      warningMessage = e instanceof Error ? e.message : 'An unknown error occurred';
      disabled = false;
      toggleQueueChecker(true);
    }
  }
  
  // Reconnect function for automatic reconnection
  async function reconnect() {
    try {
      disabled = true;
      warningMessage = 'Reconnecting...';
      
      if (isImageMode) {
        await mediaStreamActions.stop();
        await mediaStreamActions.enumerateDevices();
        await mediaStreamActions.start();
      }
      
      await lcmLiveActions.reconnect(getSreamdata);
      warningMessage = '';
      toggleQueueChecker(false);
    } catch (e) {
      warningMessage = e instanceof Error ? e.message : 'Reconnection failed';
      toggleQueueChecker(true);
    } finally {
      disabled = false;
    }
  }
</script>

<svelte:head>
  <script
    src="https://cdnjs.cloudflare.com/ajax/libs/iframe-resizer/4.3.9/iframeResizer.contentWindow.min.js"
  ></script>
</svelte:head>

<main class="container mx-auto flex max-w-5xl flex-col gap-3 px-4 py-4">
  <Warning bind:message={warningMessage}></Warning>
  <article class="text-center">
    {#if pageContent}
      {@html pageContent}
    {/if}
    {#if maxQueueSize > 0}
      <p class="text-sm">
        There are <span id="queue_size" class="font-bold">{currentQueueSize}</span>
        user(s) sharing the same GPU, affecting real-time performance. Maximum queue size is {maxQueueSize}.
        <a
          href="https://huggingface.co/spaces/radames/Real-Time-Latent-Consistency-Model?duplicate=true"
          target="_blank"
          class="text-blue-500 underline hover:no-underline">Duplicate</a
        > and run it on your own GPU.
      </p>
    {/if}
    
    {#if $lcmLiveStatus === LCMLiveStatus.ERROR}
      <p class="text-sm mt-2">
        <button 
          class="text-blue-500 underline hover:no-underline" 
          on:click={reconnect}
          disabled={disabled}>
          Try reconnecting
        </button>
      </p>
    {/if}
  </article>
  {#if pipelineParams}
    <article class="my-3 grid grid-cols-1 gap-3 sm:grid-cols-4">
      {#if isImageMode}
        <div class="col-span-2 sm:col-start-1">
          <VideoInput
            width={Number(pipelineParams.width.default)}
            height={Number(pipelineParams.height.default)}
          ></VideoInput>
        </div>
      {/if}
      <div class={isImageMode ? 'col-span-2 sm:col-start-3' : 'col-span-4'}>
        <ImagePlayer />
      </div>
      <div class="sm:col-span-4 sm:row-start-2">
        <Button on:click={toggleLcmLive} {disabled} classList={'text-lg my-1 p-2'}>
          {#if isConnecting}
            Connecting...
          {:else if isLCMRunning}
            Stop
          {:else}
            Start
          {/if}
        </Button>
        <PipelineOptions {pipelineParams}></PipelineOptions>
      </div>
    </article>
  {:else}
    <!-- loading -->
    <div class="flex items-center justify-center gap-3 py-48 text-2xl">
      <Spinner classList={'animate-spin opacity-50'}></Spinner>
      <p>Loading...</p>
    </div>
  {/if}
</main>

<style lang="postcss">
  :global(html) {
    @apply text-black dark:bg-gray-900 dark:text-white;
  }
</style>