frontend/src/routes/+layout.svelte

<script>
  import '../app.css';
  import { Home, Settings, History, Github, Menu } from 'lucide-svelte';
  import { onMount } from 'svelte';
  
  let currentPage = 'tts';
  let sidebarOpen = true;
  let isLoggedIn = false;
  let username = '';
  let showTokenInput = false;
  let tokenInput = '';
  let tokenError = '';
  
  onMount(() => {
    // Check if user is logged in
    checkLoginStatus();
    
    // Re-check login status when page becomes visible (e.g., after OAuth redirect)
    document.addEventListener('visibilitychange', () => {
      if (!document.hidden) {
        checkLoginStatus();
      }
    });
    
    // Listen for storage changes (e.g., when token is set from OAuth callback)
    window.addEventListener('storage', checkLoginStatus);
    
    // Also check periodically to catch cases where localStorage changes in same tab
    const interval = setInterval(checkLoginStatus, 1000);
    
    return () => {
      window.removeEventListener('storage', checkLoginStatus);
      clearInterval(interval);
    };
  });
  
  function checkLoginStatus() {
    const token = localStorage.getItem('hf_access_token');
    if (token) {
      // Fetch user info from HuggingFace API
      fetchUserInfo(token);
    } else {
      isLoggedIn = false;
      username = '';
    }
  }
  
  async function fetchUserInfo(token) {
    try {
      // Validate token using the correct whoami-v2 endpoint
      const response = await fetch('https://huggingface.co/api/whoami-v2', {
        headers: {
          'Authorization': `Bearer ${token}`
        }
      });
      
      if (response.ok) {
        const userData = await response.json();
        isLoggedIn = true;
        const fullName = userData.name || userData.fullname || userData.login || userData.username || 'User';
        username = fullName.split(' ')[0];
      } else {
        // Token might be invalid, remove it
        localStorage.removeItem('hf_access_token');
        isLoggedIn = false;
        username = '';
      }
    } catch (error) {
      // Token might be invalid, remove it
      localStorage.removeItem('hf_access_token');
      isLoggedIn = false;
      username = '';
    }
  }
  
  function handleAuthAction() {
    if (isLoggedIn) {
      // Logout
      localStorage.removeItem('hf_access_token');
      sessionStorage.removeItem('oauth_state');
      isLoggedIn = false;
      username = '';
    } else {
      // Show token input instead of OAuth
      showTokenInput = true;
      tokenInput = '';
      tokenError = '';
    }
  }

  function closeTokenInput() {
    showTokenInput = false;
    tokenInput = '';
    tokenError = '';
  }

  async function submitToken() {
    if (!tokenInput.trim()) {
      tokenError = 'Please enter a token';
      return;
    }

    if (!tokenInput.startsWith('hf_')) {
      tokenError = 'Token should start with "hf_"';
      return;
    }

    try {
      // Validate token using the correct whoami-v2 endpoint
      const response = await fetch('https://huggingface.co/api/whoami-v2', {
        headers: {
          'Authorization': `Bearer ${tokenInput.trim()}`
        }
      });

      if (response.ok) {
        const userData = await response.json();
        localStorage.setItem('hf_access_token', tokenInput.trim());
        isLoggedIn = true;
        const fullName = userData.name || userData.fullname || userData.login || userData.username || 'User';
        username = fullName.split(' ')[0];
        closeTokenInput();
      } else {
        const errorText = await response.text();
        console.log('Token validation error:', response.status, errorText);
        tokenError = `Invalid token (${response.status}). Please check your token and try again.`;
      }
    } catch (error) {
      console.error('Token validation error:', error);
      tokenError = 'Error validating token. Please try again.';
    }
  }
</script>

<div class="flex h-screen bg-white">
  <!-- Sidebar -->
  <aside class="w-56 border-r border-gray-200 bg-white flex-shrink-0 {sidebarOpen ? '' : 'hidden'}">
    <div class="p-4 border-b border-gray-200">
      <div class="flex items-center gap-3">
        <img src="/assets/hf-studio-logo.png" alt="HF Logo" class="w-8 h-8" />
        <h1 class="text-xl font-semibold">HFStudio<sup class="text-xs text-gray-500 ml-1">BETA</sup></h1>
      </div>
    </div>
    
    <nav class="p-2 text-sm">      
      <div class="mt-2 mb-1 px-2 text-xs font-medium text-gray-500 uppercase">
        Tasks
      </div>
      
      <button
        class="w-full flex items-center gap-2 px-2 py-1.5 rounded-md hover:bg-gray-100 transition-colors text-left
               {currentPage === 'tts' ? 'bg-gray-100' : ''}"
        on:click={() => currentPage = 'tts'}
      >
        <span>🎙️</span>
        <span>Text to Speech</span>
      </button>
      
      <button
        class="w-full flex items-center gap-2 px-2 py-1.5 rounded-md text-left opacity-40 cursor-not-allowed"
        disabled
      >
        <span>🎵</span>
        <span>Voice Cloning</span>
      </button>
      
      <button
        class="w-full flex items-center gap-2 px-2 py-1.5 rounded-md text-left opacity-40 cursor-not-allowed"
        disabled
      >
        <span>🎧</span>
        <span>Speech to Text</span>
      </button>
      
      <button
        class="w-full flex items-center gap-2 px-2 py-1.5 rounded-md text-left opacity-40 cursor-not-allowed"
        disabled
      >
        <span>🎼</span>
        <span>Sound Effects</span>
      </button>
      
      <button
        class="w-full flex items-center gap-2 px-2 py-1.5 rounded-md text-left opacity-40 cursor-not-allowed"
        disabled
      >
        <span>🎸</span>
        <span>Music Generation</span>
      </button>
      
      <button
        class="w-full flex items-center gap-2 px-2 py-1.5 rounded-md text-left opacity-40 cursor-not-allowed"
        disabled
      >
        <span>🔊</span>
        <span>Audio Enhancement</span>
      </button>
      
    </nav>
    
    <!-- Sign in with Hugging Face at bottom -->
    <div class="absolute bottom-4 left-2 right-2 w-52">
      <button
        on:click={handleAuthAction}
        class="w-full px-6 py-3 bg-black text-white rounded-lg font-medium hover:bg-gray-800 transition-colors shadow-sm flex items-center justify-center gap-2 text-sm"
      >
        <img src="/assets/hf-logo.png" alt="HF Logo" class="w-5 h-5" />
        {#if isLoggedIn}
          <span>Sign Out, {username}</span>
        {:else}
          <span>Sign In</span>
        {/if}
      </button>
    </div>
  </aside>
  
  <!-- Main content -->
  <main class="flex-1 overflow-auto">
    <slot />
  </main>

  <!-- Token Input Modal -->
  {#if showTokenInput}
    <div class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">
      <div class="bg-white rounded-lg p-6 max-w-md w-full mx-4 shadow-xl">
        <h2 class="text-xl font-semibold mb-4">Sign In with HuggingFace Token</h2>
        
        <div class="mb-4 p-3 bg-blue-50 rounded-md text-sm">
          <p class="text-blue-800 mb-2">
            <strong>Temporary:</strong> OAuth is being fixed. For now, please use a HuggingFace token.
          </p>
          <p class="text-blue-700">
            1. Go to <a href="https://huggingface.co/settings/tokens" target="_blank" class="underline text-blue-600">HuggingFace Settings</a><br>
            2. Create a new token with "Inference API" permissions<br>
            3. Copy and paste it below
          </p>
        </div>

        <div class="mb-4">
          <label for="token" class="block text-sm font-medium text-gray-700 mb-2">
            HuggingFace Token
          </label>
          <input
            id="token"
            type="password"
            bind:value={tokenInput}
            placeholder="hf_..."
            class="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-orange-500 focus:border-transparent"
            on:keydown={(e) => e.key === 'Enter' && submitToken()}
          />
          {#if tokenError}
            <p class="text-red-600 text-sm mt-1">{tokenError}</p>
          {/if}
        </div>

        <div class="flex justify-end gap-3">
          <button
            on:click={closeTokenInput}
            class="px-4 py-2 text-gray-600 hover:text-gray-800 transition-colors"
          >
            Cancel
          </button>
          <button
            on:click={submitToken}
            class="px-4 py-2 bg-orange-500 text-white rounded-md hover:bg-orange-600 transition-colors"
          >
            Sign In
          </button>
        </div>
      </div>
    </div>
  {/if}
</div>