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<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>FLUX-1 Schnell Demo (HF OAuth)</title>
    <style>
      :root {
        font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
      }
      body {
        margin: 0;
        padding: 2rem;
        background: #f5f5f5;
      }
      .card {
        max-width: 900px;
        margin: 0 auto;
        background: #ffffff;
        padding: 2rem;
        border-radius: 10px;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
      }
      h1 {
        margin-top: 0;
      }
      #signin {
        background: #ff7b7b;
        color: #fff;
        border: none;
        padding: 0.6rem 1.2rem;
        border-radius: 6px;
        cursor: pointer;
        font-size: 1rem;
        display: none; /* shown once JS decides it's needed */
      }
      #banner {
        display: none;
        margin-top: 1rem;
        padding: 0.8rem 1rem;
        border-radius: 6px;
        background: #fff3cd;
        color: #856404;
        border: 1px solid #ffeeba;
      }
      /* Generator UI */
      form {
        margin-top: 2rem;
      }
      label {
        font-weight: 600;
        margin-bottom: 0.25rem;
        display: block;
      }
      input[type="text"], input[type="number"] {
        width: 100%;
        padding: 0.5rem 0.75rem;
        border: 1px solid #ccc;
        border-radius: 4px;
        box-sizing: border-box;
        margin-bottom: 1rem;
      }
      button.generate {
        background: #007bff;
        color: #fff;
        border: none;
        padding: 0.6rem 1.4rem;
        border-radius: 6px;
        cursor: pointer;
        font-size: 1rem;
      }
      button.generate:disabled {
        background: #9ac7ff;
        cursor: not-allowed;
      }
      img {
        max-width: 100%;
        border-radius: 8px;
        margin-top: 1rem;
      }
    </style>
  </head>
  <body>
    <div class="card">
      <h1>FLUX-1 Schnell + Joy Caption + Zephyr-7B</h1>
      <p>
        This static Space demonstrates how to call a remote Gradio Space while
        letting <strong>each visitor&rsquo;s own Hugging Face subscription</strong> cover
        the compute costs. Generate images with FLUX-1, caption them with Joy Caption, and generate text with Zephyr-7B.
      </p>

      <!-- 1️⃣ Sign-in button (shown only when needed) -->
      <button id="signin">Sign in with Hugging Face</button>
      <div id="banner"></div>

      <!-- 2️⃣ Image-generation form (hidden until the app is ready) -->
      <form id="generateForm" style="display:none;">
        <label for="prompt">Prompt</label>
        <input type="text" id="prompt" placeholder="Enter your prompt" required />

        <label for="seed">Seed</label>
        <input type="number" id="seed" value="0" min="0" max="2147483647" />

        <label>
          <input type="checkbox" id="randomize_seed" checked /> Randomize seed
        </label>

        <div style="display:flex; gap:1rem;">
          <div style="flex:1;">
            <label for="width">Width</label>
            <input type="number" id="width" value="1024" min="256" max="2048" step="32" />
          </div>
          <div style="flex:1;">
            <label for="height">Height</label>
            <input type="number" id="height" value="1024" min="256" max="2048" step="32" />
          </div>
        </div>

        <label for="steps">Number of inference steps</label>
        <input type="number" id="steps" value="4" min="1" max="50" />

        <button type="submit" class="generate">Generate Image</button>
      </form>

      <!-- 3️⃣ Caption form -->
      <form id="captionForm" style="display:none; margin-top:2rem; border-top:1px solid #eee; padding-top:2rem;">
        <h3>Caption Image</h3>
        <label for="imageInput">Upload Image or Generate Above</label>
        <input type="file" id="imageInput" accept="image/*" />
        
        <label for="captionType">Caption Type</label>
        <select id="captionType">
          <option value="Descriptive">Descriptive</option>
          <option value="Descriptive (Informal)">Descriptive (Informal)</option>
          <option value="Training Prompt">Training Prompt</option>
          <option value="MidJourney">MidJourney</option>
          <option value="Booru tag list">Booru tag list</option>
          <option value="Booru-like tag list">Booru-like tag list</option>
          <option value="Art Critic">Art Critic</option>
          <option value="Product Listing">Product Listing</option>
          <option value="Social Media Post">Social Media Post</option>
        </select>
        
        <label for="captionLength">Caption Length</label>
        <select id="captionLength">
          <option value="any">Any</option>
          <option value="very short">Very Short</option>
          <option value="short">Short</option>
          <option value="medium-length">Medium</option>
          <option value="long" selected>Long</option>
          <option value="very long">Very Long</option>
        </select>
        
        <button type="submit" class="generate">Generate Caption</button>
      </form>

      <!-- 4️⃣ Result container -->
      <div id="result"></div>
      
      <!-- 5️⃣ Caption result -->
      <div id="captionResult" style="margin-top:1rem;"></div>

      <!-- 6️⃣ Text generation form -->
      <form id="textForm" style="display:none; margin-top:2rem; border-top:1px solid #eee; padding-top:2rem;">
        <h3>Generate Text</h3>
        <label for="textPrompt">Prompt</label>
        <textarea id="textPrompt" rows="4" placeholder="Enter your prompt here..." style="width:100%; padding:0.5rem; border:1px solid #ccc; border-radius:4px; box-sizing:border-box; margin-bottom:1rem;"></textarea>
        
        <label for="systemPrompt">System Prompt</label>
        <textarea id="systemPrompt" rows="3" placeholder="You are a helpful assistant..." style="width:100%; padding:0.5rem; border:1px solid #ccc; border-radius:4px; box-sizing:border-box; margin-bottom:1rem;"></textarea>
        
        <div style="display:flex; gap:1rem;">
          <div style="flex:1;">
            <label for="maxNewTokens">Max New Tokens</label>
            <input type="number" id="maxNewTokens" value="1024" min="1" max="2048" step="1" />
          </div>
          <div style="flex:1;">
            <label for="temperature">Temperature</label>
            <input type="number" id="temperature" value="0.7" min="0.1" max="4.0" step="0.1" />
          </div>
        </div>
        
        <div style="display:flex; gap:1rem;">
          <div style="flex:1;">
            <label for="topP">Top P</label>
            <input type="number" id="topP" value="0.95" min="0.05" max="1.0" step="0.05" />
          </div>
          <div style="flex:1;">
            <label for="topK">Top K</label>
            <input type="number" id="topK" value="50" min="1" max="1000" step="1" />
          </div>
        </div>
        
        <label for="repetitionPenalty">Repetition Penalty</label>
        <input type="number" id="repetitionPenalty" value="1.0" min="1.0" max="2.0" step="0.05" />
        
        <button type="submit" class="generate">Generate Text</button>
      </form>
      
      <!-- 7️⃣ Text generation result -->
      <div id="textResult" style="margin-top:1rem;"></div>

      <hr />
      <p>
        Source &amp; docs:
        <a href="https://huggingface.co/docs/hub/spaces-oauth" target="_blank">Spaces OAuth</a>,
        <a href="https://github.com/huggingface/huggingface.js" target="_blank">huggingface.js</a>,
        <a href="https://js.gradio.app" target="_blank">@gradio/client</a>
      </p>
    </div>

    <!-- 4️⃣ App logic -->
    <script type="module">
      import {
        oauthLoginUrl,
        oauthHandleRedirectIfPresent
      } from "https://cdn.jsdelivr.net/npm/@huggingface/hub@0.21/+esm";
      import { Client } from "https://cdn.jsdelivr.net/npm/@gradio/client/dist/index.min.js";

      // DOM helpers
      const signinBtn = document.getElementById("signin");
      const banner = document.getElementById("banner");
      const form = document.getElementById("generateForm");
      const resultDiv = document.getElementById("result");
      const captionForm = document.getElementById("captionForm");
      const captionResultDiv = document.getElementById("captionResult");
      const textForm = document.getElementById("textForm");
      const textResultDiv = document.getElementById("textResult");

      const BANNER_ANON =
        "⚠️ You are not logged in – anonymous users get only ~60 seconds of zero-GPU time per day. Sign in for higher limits.";

      // Try to finish OAuth redirect (if we just came back from HF SSO)
      let session = await oauthHandleRedirectIfPresent();

      if (!session) {
        // Not signed in: show banner & sign-in button
        banner.textContent = BANNER_ANON;
        banner.style.display = "block";
        signinBtn.style.display = "inline-block";
        signinBtn.onclick = async () => {
          const url = await oauthLoginUrl({ scopes: ["inference-api"] });
          window.location.href = url; // full-page redirect
        };

        // Proceed anonymously (limited quota)
        startApp(null);
      } else {
        banner.style.display = "none";
        startApp(session.accessToken, session.userInfo);
      }

      /**
       * Main app logic: connect to remote Space & wire up the form.
       * @param {string|null} hfToken
       * @param {object} [userInfo]
       */
      async function startApp(hfToken, userInfo = null) {
        try {
          banner.textContent = "Connecting to FLUX.1-schnell, Joy Caption, and Zephyr-7B…";
          banner.style.display = "block";

          const opts = hfToken ? { hf_token: hfToken } : {};
          const flux = await Client.connect(
            "black-forest-labs/FLUX.1-schnell",
            opts
          );
          
          const joyCaption = await Client.connect(
            "fancyfeast/joy-caption-alpha-two",
            opts
          );
          
          // Connect to Zephyr-7B on Hugging Face Spaces
          const zephyr = await Client.connect(
            "hysts/zephyr-7b",
            opts
          );

          banner.style.display = "none";
          form.style.display = "block";
          captionForm.style.display = "block";
          textForm.style.display = "block";

          if (userInfo) {
            const greeting = document.createElement("p");
            greeting.textContent = `Hello, ${userInfo.name || userInfo.preferred_username}!`;
            form.parentNode.insertBefore(greeting, form);
          }

          form.addEventListener("submit", async (e) => {
            e.preventDefault();
            const prompt = document.getElementById("prompt").value;
            const seed = parseInt(document.getElementById("seed").value, 10);
            const randomize = document.getElementById("randomize_seed").checked;
            const width = parseInt(document.getElementById("width").value, 10);
            const height = parseInt(document.getElementById("height").value, 10);
            const steps = parseInt(document.getElementById("steps").value, 10);

            const btn = form.querySelector("button.generate");
            btn.disabled = true;
            btn.textContent = "Generating…";
            resultDiv.innerHTML = "Generating image…";

            try {
              const output = await flux.predict("/infer", [
                prompt,
                seed,
                randomize,
                width,
                height,
                steps
              ]);

              const [image, usedSeed] = output.data;
              let url;
              if (typeof image === "string") url = image;
              else if (image && image.url) url = image.url;
              else if (image && image.path) url = image.path;

              if (url) {
                resultDiv.innerHTML = `
                  <img src="${url}" alt="Generated" />
                  <p><strong>Seed</strong>: ${usedSeed}</p>
                  <p><strong>Prompt</strong>: ${prompt}</p>
                `;
                
                // Store image for captioning (fetch the image as blob)
                try {
                  const response = await fetch(url);
                  currentImage = await response.blob();
                } catch (imgErr) {
                  console.warn("Could not fetch generated image for captioning:", imgErr);
                }
              } else {
                resultDiv.textContent = "Unexpected image format – open console.";
              }
            } catch (err) {
              console.error(err);
              resultDiv.textContent = `Generation failed: ${err}`;
            } finally {
              btn.disabled = false;
              btn.textContent = "Generate Image";
            }
          });

          // Caption form event listener
          let currentImage = null;
          
          captionForm.addEventListener("submit", async (e) => {
            e.preventDefault();
            
            const imageInput = document.getElementById("imageInput");
            const captionType = document.getElementById("captionType").value;
            const captionLength = document.getElementById("captionLength").value;
            
            let imageToCaption = currentImage;
            
            // If user uploaded an image, use that
            if (imageInput.files && imageInput.files[0]) {
              imageToCaption = imageInput.files[0];
            }
            
            if (!imageToCaption) {
              captionResultDiv.innerHTML = "Please upload an image or generate one above.";
              return;
            }
            
            const btn = captionForm.querySelector("button");
            btn.disabled = true;
            btn.textContent = "Generating Caption…";
            captionResultDiv.innerHTML = "Generating caption…";
            
            try {
              const output = await joyCaption.predict("/stream_chat", [
                imageToCaption,
                captionType,
                captionLength,
                [], // extra_options
                "", // name_input
                ""  // custom_prompt
              ]);
              
              const [prompt, caption] = output.data;
              captionResultDiv.innerHTML = `
                <div style="background:#f8f9fa; padding:1rem; border-radius:6px; margin-top:1rem;">
                  <h4>Generated Caption</h4>
                  <p><strong>Type:</strong> ${captionType}</p>
                  <p><strong>Length:</strong> ${captionLength}</p>
                  <p><strong>Caption:</strong></p>
                  <p style="font-style:italic;">${caption}</p>
                </div>
              `;
            } catch (err) {
              console.error(err);
              captionResultDiv.innerHTML = `<p style="color:red;">Caption generation failed: ${err}</p>`;
            } finally {
              btn.disabled = false;
              btn.textContent = "Generate Caption";
            }
          });
          
          // Text generation form event listener
          textForm.addEventListener("submit", async (e) => {
            e.preventDefault();
            
            const prompt = document.getElementById("textPrompt").value.trim();
            const systemPrompt = document.getElementById("systemPrompt").value.trim();
            const maxNewTokens = parseInt(document.getElementById("maxNewTokens").value, 10);
            const temperature = parseFloat(document.getElementById("temperature").value);
            const topP = parseFloat(document.getElementById("topP").value);
            const topK = parseInt(document.getElementById("topK").value, 10);
            const repetitionPenalty = parseFloat(document.getElementById("repetitionPenalty").value);
            
            if (!prompt) {
              textResultDiv.innerHTML = "<p style='color:red;'>Please enter a prompt.</p>";
              return;
            }
            
            const btn = textForm.querySelector("button");
            btn.disabled = true;
            btn.textContent = "Generating Text…";
            textResultDiv.innerHTML = "Generating text…";
            
            try {
              // Call Zephyr-7B ChatInterface with proper parameters
              // ChatInterface expects positional args: message, chat_history, then additional_inputs
              const output = await zephyr.predict("/chat", [
                prompt,          // message
                [],              // chat_history (empty for single turn)
                systemPrompt,    // system_prompt (additional_input 1)
                maxNewTokens,    // max_new_tokens (additional_input 2)
                temperature,     // temperature (additional_input 3)
                topP,           // top_p (additional_input 4)
                topK,           // top_k (additional_input 5)
                repetitionPenalty // repetition_penalty (additional_input 6)
              ]);
              
              // ChatInterface returns the full response
              const generatedText = output.data;
              textResultDiv.innerHTML = `
                <div style="background:#f8f9fa; padding:1rem; border-radius:6px; margin-top:1rem;">
                  <h4>Generated Text</h4>
                  <p><strong>Prompt:</strong> ${prompt.substring(0, 100)}${prompt.length > 100 ? '...' : ''}</p>
                  <p><strong>Generated:</strong></p>
                  <div style="white-space:pre-wrap; font-family:monospace; background:#fff; padding:1rem; border-radius:4px; border:1px solid #ddd;">${generatedText}</div>
                </div>
              `;
            } catch (err) {
              console.error(err);
              textResultDiv.innerHTML = `<p style="color:red;">Text generation failed: ${err}</p>`;
            } finally {
              btn.disabled = false;
              btn.textContent = "Generate Text";
            }
          });
          
          
        } catch (err) {
          console.error(err);
          banner.textContent = `❌ Failed to connect: ${err}`;
          banner.style.display = "block";
          signinBtn.style.display = "none";
        }
      }
    </script>
  </body>
</html>