v2: add AI teacher chat

.gitignore

@@ -0,0 +1,5 @@
+.env
+node_modules/
+.vibe42-run.log
+.vibe42-run.pid
+data.json

index.html

@@ -15,6 +15,12 @@
   </header>
 
   <main class="container">
+    <!-- Кнопка учителя -->
+    <button id="teacher-btn" class="teacher-fab">
+      <span class="teacher-icon">👨‍🏫</span>
+      <span class="teacher-text">Учитель</span>
+    </button>
+
     <!-- Выбор уровня -->
     <section id="levels-section" class="section">
       <h2>Выберите ваш уровень</h2>
@@ -79,6 +85,30 @@
         <div id="practice-content" class="content-grid"></div>
       </div>
     </section>
+
+    <!-- Чат с учителем -->
+    <div id="teacher-chat" class="teacher-chat hidden">
+      <div class="chat-header">
+        <h3>👨‍🏫 Виртуальный учитель</h3>
+        <button id="close-chat" class="chat-close">✕</button>
+      </div>
+      <div class="chat-messages" id="chat-messages">
+        <div class="message teacher">
+          <div class="message-bubble">
+            Привет! Я твой учитель английского. Могу помочь с:
+            <br>• Разговорной практикой
+            <br>• Исправлением ошибок
+            <br>• Объяснением грамматики
+            <br>• Подбором слов
+            <br><br>Напиши мне на английском или русском!
+          </div>
+        </div>
+      </div>
+      <div class="chat-input-area">
+        <input type="text" id="chat-input" placeholder="Напиши сообщение..." class="chat-input">
+        <button id="send-btn" class="send-btn">➤</button>
+      </div>
+    </div>
   </main>
 
   <footer class="footer">

package.json

@@ -0,0 +1,8 @@
+{
+  "name": "english-learning",
+  "private": true,
+  "type": "commonjs",
+  "scripts": {
+    "start": "node server.js"
+  }
+}

script.js

@@ -274,6 +274,7 @@ const levelsData = {
 
 // Текущее состояние
 let currentLevel = null;
+let chatSessionId = null;
 
 // DOM элементы
 const levelsSection = document.getElementById('levels-section');
@@ -284,6 +285,14 @@ const tabBtns = document.querySelectorAll('.tab-btn');
 const tabContents = document.querySelectorAll('.tab-content');
 const vocabSearch = document.getElementById('vocab-search');
 
+// Учитель
+const teacherBtn = document.getElementById('teacher-btn');
+const teacherChat = document.getElementById('teacher-chat');
+const closeChat = document.getElementById('close-chat');
+const chatMessages = document.getElementById('chat-messages');
+const chatInput = document.getElementById('chat-input');
+const sendBtn = document.getElementById('send-btn');
+
 // Инициализация
 function init() {
   // Клик по уровням
@@ -313,6 +322,14 @@ function init() {
   vocabSearch.addEventListener('input', (e) => {
     filterVocabulary(e.target.value);
   });
+
+  // Учитель
+  teacherBtn.addEventListener('click', toggleChat);
+  closeChat.addEventListener('click', toggleChat);
+  sendBtn.addEventListener('click', sendMessage);
+  chatInput.addEventListener('keypress', (e) => {
+    if (e.key === 'Enter') sendMessage();
+  });
 }
 
 // Показать уровень
@@ -416,5 +433,115 @@ function handleExerciseClick(e) {
   }
 }
 
+// Учитель - функции
+function toggleChat() {
+  teacherChat.classList.toggle('hidden');
+  if (!teacherChat.classList.contains('hidden')) {
+    chatInput.focus();
+  }
+}
+
+async function sendMessage() {
+  const text = chatInput.value.trim();
+  if (!text) return;
+
+  // Добавляем сообщение студента
+  addMessage(text, 'student');
+  chatInput.value = '';
+
+  // Показываем индикатор набора
+  showTypingIndicator();
+
+  try {
+    // Получаем ответ от ИИ
+    const response = await askTeacher(text);
+    hideTypingIndicator();
+    addMessage(response, 'teacher');
+  } catch (error) {
+    hideTypingIndicator();
+    addMessage('Извини, я временно недоступен. Попробуй ещё раз!', 'teacher');
+    console.error('Teacher error:', error);
+  }
+}
+
+function addMessage(text, type) {
+  const messageDiv = document.createElement('div');
+  messageDiv.className = `message ${type}`;
+  messageDiv.innerHTML = `<div class="message-bubble">${text}</div>`;
+  chatMessages.appendChild(messageDiv);
+  chatMessages.scrollTop = chatMessages.scrollHeight;
+}
+
+function showTypingIndicator() {
+  const typing = document.createElement('div');
+  typing.className = 'message teacher';
+  typing.id = 'typing-indicator';
+  typing.innerHTML = `
+    <div class="message-bubble">
+      <div class="typing-indicator">
+        <div class="typing-dot"></div>
+        <div class="typing-dot"></div>
+        <div class="typing-dot"></div>
+      </div>
+    </div>
+  `;
+  chatMessages.appendChild(typing);
+  chatMessages.scrollTop = chatMessages.scrollHeight;
+}
+
+function hideTypingIndicator() {
+  const typing = document.getElementById('typing-indicator');
+  if (typing) typing.remove();
+}
+
+async function askTeacher(message) {
+  // Получаем контекст уровня
+  const levelContext = currentLevel ? `Current student level: ${currentLevel}. ` : '';
+  
+  const messages = [
+    {
+      role: 'system',
+      content: `You are a friendly and supportive English teacher. Your tasks:
+1. Communicate at the student's level
+2. Correct mistakes gently and explain grammar rules
+3. Help with vocabulary and constructions
+4. Encourage and motivate
+5. Answer grammar questions
+
+${levelContext}Respond briefly (2-4 sentences), in a friendly manner. If the student writes in Russian, respond in Russian with English examples. If in English, respond in English but you can add translations of difficult words.`
+    },
+    {
+      role: 'user',
+      content: message
+    }
+  ];
+
+  try {
+    const response = await fetch('/api/ai', {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json'
+      },
+      body: JSON.stringify({ messages })
+    });
+
+    if (!response.ok) {
+      throw new Error('AI error: ' + response.status);
+    }
+
+    const data = await response.json();
+    const answer = data.choices?.[0]?.message?.content;
+    
+    if (!answer) {
+      throw new Error('Empty AI response');
+    }
+
+    return answer.replace(/\n/g, '<br>');
+  } catch (error) {
+    console.error('AI request failed:', error);
+    return 'Sorry, I can\'t respond right now. But I\'m here to help you with English!';
+  }
+}
+
 // Запуск
 init();

server.js

@@ -0,0 +1,75 @@
+const http = require('http');
+const fs = require('fs');
+const path = require('path');
+
+const PORT = process.env.PORT || 3000;
+
+function body(req) {
+  return new Promise((resolve) => {
+    let s = '';
+    req.on('data', (c) => (s += c));
+    req.on('end', () => {
+      try {
+        resolve(JSON.parse(s || '{}'));
+      } catch (_) {
+        resolve({});
+      }
+    });
+  });
+}
+
+http.createServer(async (req, res) => {
+  // CORS
+  res.setHeader('Access-Control-Allow-Origin', '*');
+  res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS');
+  res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
+  
+  if (req.method === 'OPTIONS') {
+    res.writeHead(200);
+    return res.end();
+  }
+
+  // API: AI запрос
+  if (req.method === 'POST' && req.url === '/api/ai') {
+    try {
+      const data = await body(req);
+      const aiResponse = await fetch(process.env.AI_BASE_URL + '/chat/completions', {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+          'Authorization': 'Bearer ' + process.env.AI_API_KEY
+        },
+        body: JSON.stringify({
+          model: process.env.AI_MODEL,
+          messages: data.messages || []
+        })
+      });
+
+      if (!aiResponse.ok) {
+        throw new Error('AI error: ' + aiResponse.status);
+      }
+
+      const result = await aiResponse.json();
+      res.writeHead(200, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify(result));
+    } catch (error) {
+      res.writeHead(500, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({ error: error.message }));
+    }
+    return;
+  }
+
+  // Статика
+  let file = req.url === '/' ? '/index.html' : req.url.split('?')[0];
+  const full = path.join(__dirname, file);
+  
+  if (full.startsWith(__dirname) && fs.existsSync(full) && fs.statSync(full).isFile()) {
+    const ext = path.extname(full);
+    const type = ext === '.css' ? 'text/css' : ext === '.js' ? 'application/javascript' : 'text/html';
+    res.writeHead(200, { 'Content-Type': type + '; charset=utf-8' });
+    return res.end(fs.readFileSync(full));
+  }
+
+  res.writeHead(404);
+  res.end('Not found');
+}).listen(PORT, () => console.log('Сервер запущен на порту ' + PORT));

style.css

@@ -88,6 +88,196 @@ body {
   display: none;
 }
 
+/* Кнопка учителя */
+.teacher-fab {
+  position: fixed;
+  bottom: 30px;
+  right: 30px;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  color: white;
+  border: none;
+  border-radius: 50px;
+  padding: 16px 24px;
+  font-size: 16px;
+  font-weight: bold;
+  cursor: pointer;
+  box-shadow: 0 8px 30px rgba(102, 126, 234, 0.4);
+  transition: all 0.3s;
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  z-index: 999;
+}
+
+.teacher-fab:hover {
+  transform: scale(1.05);
+  box-shadow: 0 12px 40px rgba(102, 126, 234, 0.6);
+}
+
+.teacher-icon {
+  font-size: 24px;
+}
+
+/* Чат учителя */
+.teacher-chat {
+  position: fixed;
+  bottom: 100px;
+  right: 30px;
+  width: 400px;
+  max-height: 600px;
+  background: white;
+  border-radius: 16px;
+  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.2);
+  display: flex;
+  flex-direction: column;
+  z-index: 1000;
+  overflow: hidden;
+}
+
+.chat-header {
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  color: white;
+  padding: 16px 20px;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.chat-header h3 {
+  margin: 0;
+  font-size: 18px;
+}
+
+.chat-close {
+  background: rgba(255, 255, 255, 0.2);
+  border: none;
+  color: white;
+  width: 32px;
+  height: 32px;
+  border-radius: 50%;
+  cursor: pointer;
+  font-size: 20px;
+  transition: all 0.3s;
+}
+
+.chat-close:hover {
+  background: rgba(255, 255, 255, 0.3);
+}
+
+.chat-messages {
+  flex: 1;
+  padding: 20px;
+  overflow-y: auto;
+  background: #f8f9ff;
+  max-height: 400px;
+}
+
+.message {
+  margin-bottom: 16px;
+  display: flex;
+}
+
+.message.student {
+  justify-content: flex-end;
+}
+
+.message.teacher {
+  justify-content: flex-start;
+}
+
+.message-bubble {
+  max-width: 80%;
+  padding: 12px 16px;
+  border-radius: 16px;
+  line-height: 1.5;
+}
+
+.message.teacher .message-bubble {
+  background: white;
+  border: 1px solid #e0e0e0;
+  color: #333;
+  border-bottom-left-radius: 4px;
+}
+
+.message.student .message-bubble {
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  color: white;
+  border-bottom-right-radius: 4px;
+}
+
+.chat-input-area {
+  padding: 16px;
+  background: white;
+  border-top: 1px solid #e0e0e0;
+  display: flex;
+  gap: 10px;
+}
+
+.chat-input {
+  flex: 1;
+  padding: 12px 16px;
+  border: 2px solid #e0e0e0;
+  border-radius: 24px;
+  font-size: 14px;
+}
+
+.chat-input:focus {
+  outline: none;
+  border-color: #667eea;
+}
+
+.send-btn {
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  color: white;
+  border: none;
+  width: 44px;
+  height: 44px;
+  border-radius: 50%;
+  cursor: pointer;
+  font-size: 18px;
+  transition: all 0.3s;
+}
+
+.send-btn:hover {
+  transform: scale(1.1);
+}
+
+.send-btn:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+.typing-indicator {
+  display: flex;
+  gap: 4px;
+  padding: 12px 16px;
+}
+
+.typing-dot {
+  width: 8px;
+  height: 8px;
+  background: #ccc;
+  border-radius: 50%;
+  animation: typing 1.4s infinite;
+}
+
+.typing-dot:nth-child(2) {
+  animation-delay: 0.2s;
+}
+
+.typing-dot:nth-child(3) {
+  animation-delay: 0.4s;
+}
+
+@keyframes typing {
+  0%, 60%, 100% {
+    transform: translateY(0);
+  }
+  30% {
+    transform: translateY(-8px);
+  }
+}
+
 .btn-back {
   background: white;
   border: 2px solid #667eea;