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<!DOCTYPE html>
<html lang="vi">

<head>
  <meta charset="UTF-8">
  <title>Chatbot Mini PLT</title>
  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap" rel="stylesheet">
  <style>
    body {
      font-family: 'Inter', sans-serif;
      background: #f4f6f9;
      margin: 0;
      padding: 0;
    }

    #chatbox {
      max-width: 700px;
      margin: 40px auto;
      background: white;
      border-radius: 16px;
      box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
      padding: 20px;
      display: flex;
      flex-direction: column;
      height: 80vh;
    }

    #header {
      display: flex;
      align-items: center;
      gap: 10px;
      border-bottom: 1px solid #eee;
      padding-bottom: 12px;
      margin-bottom: 16px;
    }

    #header img {
      width: 32px;
    }

    #header h2 {
      margin: 0;
      font-weight: 600;
      color: #1e2a44;
    }

    #messages {
      flex: 1;
      overflow-y: auto;
      padding: 10px;
      background: #f9fafb;
      border-radius: 12px;
      scroll-behavior: smooth;
    }

    .msg {
      display: flex;
      align-items: flex-end;
      margin: 12px 0;
    }

    .msg .bubble {
      padding: 12px 16px;
      border-radius: 16px;
      max-width: 70%;
      word-wrap: break-word;
      font-size: 14px;
      line-height: 1.4;
    }

    .msg.user {
      justify-content: flex-end;
    }

    .msg.user .bubble {
      background: #1e3a8a;
      color: white;
      border-bottom-right-radius: 6px;
    }

    .msg.bot {
      justify-content: flex-start;
    }

    .msg.bot .bubble {
      background: #ffffff;
      color: #1e2a44;
      border: 1px solid #e2e8f0;
      border-bottom-left-radius: 6px;
    }

    #inputArea {
      margin-top: 15px;
      display: flex;
      gap: 10px;
    }

    #inputArea input[type="text"] {
      flex: 1;
      padding: 12px;
      border: 1px solid #ddd;
      border-radius: 8px;
      font-size: 14px;
    }

    #inputArea button,
    #uploadLabel {
      padding: 10px 18px;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      font-weight: 600;
      font-size: 14px;
      transition: 0.2s;
    }

    #sendBtn {
      background: #2563eb;
      color: white;
    }

    #sendBtn:hover {
      background: #1d4ed8;
    }

    #uploadLabel {
      background: #64748b;
      color: white;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    #uploadLabel:hover {
      background: #475569;
    }

    #fileUpload {
      display: none;
    }
  </style>
</head>

<body>
  <div id="chatbox">
    <div id="header">
      <img src="https://cdn-icons-png.flaticon.com/512/4712/4712035.png" alt="bot">
      <h2>Chatbot Mini</h2>
    </div>
    <div id="messages"></div>

    <div id="inputArea">
      <input id="userInput" type="text" placeholder="Nhập câu hỏi...">
      <button id="sendBtn">Gửi</button>
      <label for="fileUpload" id="uploadLabel">📂 Upload Excel</label>
      <input type="file" id="fileUpload">
    </div>
  </div>

  <script>
    const API_URL = window.API_URL || "http://127.0.0.1:5000"; // Flask server

    const messagesDiv = document.getElementById("messages");
    const userInput = document.getElementById("userInput");

    function addMessage(text, sender) {
      const div = document.createElement("div");
      div.className = "msg " + sender;
      const bubble = document.createElement("div");
      bubble.className = "bubble";
      bubble.textContent = text;
      div.appendChild(bubble);
      messagesDiv.appendChild(div);
      messagesDiv.scrollTop = messagesDiv.scrollHeight;
    }

    document.getElementById("sendBtn").onclick = async () => {
      const text = userInput.value.trim();
      if (!text) return;
      addMessage(text, "user");
      userInput.value = "";

      try {
        const res = await fetch(API_URL + "/chat", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ message: text })
        });
        const data = await res.json();
        addMessage(data.reply, "bot");
      } catch {
        addMessage("❌ Lỗi kết nối server!", "bot");
      }
    };

    document.getElementById("fileUpload").addEventListener("change", async function () {
      const file = this.files[0];
      if (!file) return;

      addMessage("⏳ Đang upload file " + file.name + "...", "bot");

      const formData = new FormData();
      formData.append("file", file);  // 👈 phải khớp với app.py

      try {
        const res = await fetch(`${API_URL}/upload`, {
          method: "POST",
          body: formData
        });
        const data = await res.json();

        if (data.message) {
          addMessage(data.message, "bot");
        } else {
          addMessage("❌ " + (data.error || "Lỗi upload!"), "bot");
        }
      } catch (err) {
        addMessage("❌ Lỗi kết nối server!", "bot");
      }
    });
  </script>
</body>

</html>