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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>Document Q&A</title>

  <style>
    body {
      margin: 0;
      min-height: 100vh;
      font-family: Arial, sans-serif;
      background: linear-gradient(135deg, #667eea, #764ba2);
      display: flex;
      justify-content: center;
      align-items: center;
      padding: 20px;
      box-sizing: border-box;
    }

    .box {
      width: 100%;
      max-width: 700px;
      background: white;
      padding: 30px;
      border-radius: 22px;
      box-shadow: 0 10px 35px rgba(0,0,0,.2);
    }

    h1 {
      text-align: center;
    }

    .info {
      text-align: center;
      color: #666;
      margin-bottom: 25px;
    }

    input[type="file"] {
      width: 100%;
      padding: 15px;
      border: 2px dashed #aaa;
      border-radius: 12px;
      box-sizing: border-box;
    }

    textarea {
      width: 100%;
      height: 120px;
      margin-top: 20px;
      padding: 15px;
      box-sizing: border-box;
      border-radius: 12px;
      border: 1px solid #ccc;
      font-size: 16px;
      resize: vertical;
    }

    button {
      width: 100%;
      padding: 14px;
      margin-top: 15px;
      border: none;
      border-radius: 12px;
      background: #4f46e5;
      color: white;
      font-size: 16px;
      cursor: pointer;
    }

    button:disabled {
      background: #999;
    }

    #status {
      margin-top: 15px;
      text-align: center;
      font-weight: bold;
    }

    #answer {
      margin-top: 20px;
      padding: 18px;
      background: #f3f4f6;
      border-radius: 12px;
      line-height: 1.6;
      min-height: 50px;
    }
  </style>
</head>

<body>

<div class="box">

  <h1>📄 Document Q&A</h1>

  <p class="info">
    Upload a text document and ask questions about it.
  </p>

  <input
    type="file"
    id="fileInput"
    accept=".txt"
  >

  <textarea
    id="question"
    placeholder="Ask something about your document..."
  ></textarea>

  <button id="askButton" disabled>
    🤖 Ask Question
  </button>

  <div id="status"></div>

  <div id="answer">
    Your answer will appear here...
  </div>

</div>

<script>

let documentText = "";

const fileInput =
  document.getElementById("fileInput");

const question =
  document.getElementById("question");

const askButton =
  document.getElementById("askButton");

const status =
  document.getElementById("status");

const answer =
  document.getElementById("answer");


fileInput.addEventListener("change", async () => {

  const file = fileInput.files[0];

  if (!file) return;

  try {

    documentText =
      await file.text();

    status.innerText =
      "✅ Document loaded!";

    answer.innerText =
      "Ab document ke baare mein question poochho.";

    askButton.disabled = false;

  } catch (error) {

    status.innerText =
      "❌ Document read nahi ho paya.";

  }

});


askButton.addEventListener("click", () => {

  const q =
    question.value.trim().toLowerCase();

  if (!documentText) {
    answer.innerText =
      "⚠️ Pehle document upload karo.";
    return;
  }

  if (!q) {
    answer.innerText =
      "⚠️ Pehle question likho.";
    return;
  }

  const sentences =
    documentText
      .split(/[.!?]\s+/)
      .filter(Boolean);

  const words =
    q.split(/\s+/);

  let bestSentence = "";
  let bestScore = 0;

  sentences.forEach(sentence => {

    const lower =
      sentence.toLowerCase();

    let score = 0;

    words.forEach(word => {

      if (
        word.length > 2 &&
        lower.includes(word)
      ) {
        score++;
      }

    });

    if (score > bestScore) {

      bestScore = score;
      bestSentence = sentence;

    }

  });


  if (bestSentence) {

    answer.innerText =
      "📖 " + bestSentence;

  } else {

    answer.innerText =
      "🤔 Is document mein is question se related information nahi mili.";

  }

});

</script>

</body>
</html>