{% extends "base.html" %}
{% block title %}Chat{% endblock %}

{% block content %}
<div class="page-header">
  <h1>Agenten Chat</h1>
  <p>Direkte Anfrage an einen spezifischen Agenten</p>
</div>

<div class="row g-4">
  <div class="col-lg-4">
    <div class="card">
      <div class="card-header bg-primary">
        <span>💬 Neue Anfrage</span>
      </div>
      <div class="card-body">
        <form id="chatForm" onsubmit="sendChat(event)">
          <div class="mb-3">
            <label for="agent" class="form-label">Agent</label>
            <select class="form-select" id="agent" name="agent" required>
              <option value="">— Agent wählen —</option>
              {% for key, agent in agents.items() %}
              <option value="{{ key }}">{{ agent.name }}</option>
              {% endfor %}
            </select>
          </div>
          <div class="mb-3">
            <label for="prompt" class="form-label">Ihre Anfrage</label>
            <textarea class="form-control" id="prompt" name="prompt" rows="5"
              placeholder="Was soll der Agent erledigen?" required></textarea>
          </div>
          <button type="submit" class="btn btn-primary w-100" id="sendBtn">
            <span id="sendBtnText">Absenden</span>
            <span id="sendBtnSpinner" class="d-none">⏳ Verarbeite...</span>
          </button>
          <div id="chatStatus" class="mt-2 text-center" style="font-size:0.875rem;"></div>
        </form>
      </div>
    </div>
  </div>

  <div class="col-lg-8">
    <div class="card">
      <div class="card-header bg-secondary d-flex align-items-center justify-content-between">
        <span>Chat-Verlauf</span>
        {% if chat_history %}
        <span class="badge bg-secondary">{{ chat_history|length }}</span>
        {% endif %}
      </div>
      <div class="card-body chat-container" id="chatContainer">
        {% if chat_history %}
          {% for chat in chat_history %}
          <div class="chat-message">
            <div class="chat-timestamp">
              {{ chat.timestamp }}
              <span class="badge bg-primary">{{ chat.agent }}</span>
            </div>
            <div class="chat-prompt"><strong>Sie:</strong> {{ chat.prompt }}</div>
            <div class="chat-response mt-1"><strong>Antwort:</strong> {{ chat.response }}</div>
          </div>
          {% endfor %}
        {% else %}
          <div class="text-center py-5" style="color:var(--text-muted);">
            <div style="font-size:2.5rem;margin-bottom:.75rem;">💬</div>
            <p style="margin:0;">Noch keine Nachrichten.<br>
              <small>Starten Sie eine Konversation.</small>
            </p>
          </div>
        {% endif %}
      </div>
    </div>
  </div>
</div>
{% endblock %}

{% block scripts %}
<script>
let eventSource = null;

function sendChat(event) {
  event.preventDefault();
  
  const form = document.getElementById('chatForm');
  const agent = document.getElementById('agent').value;
  const prompt = document.getElementById('prompt').value.trim();
  const sendBtn = document.getElementById('sendBtn');
  const sendBtnText = document.getElementById('sendBtnText');
  const sendBtnSpinner = document.getElementById('sendBtnSpinner');
  const chatStatus = document.getElementById('chatStatus');
  const chatContainer = document.getElementById('chatContainer');
  
  if (!agent || !prompt) {
    chatStatus.innerHTML = '<span style="color:var(--danger);">Bitte Agent und Anfrage auswählen</span>';
    return;
  }
  
  // Button deaktivieren
  sendBtn.disabled = true;
  sendBtnText.classList.add('d-none');
  sendBtnSpinner.classList.remove('d-none');
  chatStatus.innerHTML = '<span style="color:var(--info);">Anfrage wird gesendet...</span>';
  
  // EventSource für Streaming
  if (eventSource) {
    eventSource.close();
  }
  
  // Anfrage per fetch senden
  fetch('/chat/send', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ agent: agent, prompt: prompt })
  })
  .then(response => {
    const reader = response.body.getReader();
    const decoder = new TextDecoder();
    let buffer = '';
    let currentResponse = '';
    let currentTimestamp = new Date().toLocaleString('de-DE', {
      year: 'numeric', month: '2-digit', day: '2-digit',
      hour: '2-digit', minute: '2-digit'
    });
    let currentAgent = '';
    
    // Neue Chat-Message erstellen
    const chatMessage = document.createElement('div');
    chatMessage.className = 'chat-message';
    chatMessage.innerHTML = `
      <div class="chat-timestamp">
        ${currentTimestamp}
        <span class="badge bg-primary" id="chatAgentBadge">...</span>
      </div>
      <div class="chat-prompt"><strong>Sie:</strong> ${escapeHtml(prompt)}</div>
      <div class="chat-response mt-1"><strong>Antwort:</strong> <span id="chatResponseText">⏳ Warte auf Antwort...</span></div>
    `;
    
    // Placeholder entfernen falls vorhanden
    const placeholder = chatContainer.querySelector('.text-center.py-5');
    if (placeholder) {
      placeholder.remove();
    }
    
    chatContainer.appendChild(chatMessage);
    chatContainer.scrollTop = chatContainer.scrollHeight;
    
    const responseText = document.getElementById('chatResponseText');
    const agentBadge = document.getElementById('chatAgentBadge');
    
    function processChunk() {
      reader.read().then(({ done, value }) => {
        if (done) {
          // Stream beendet
          sendBtn.disabled = false;
          sendBtnText.classList.remove('d-none');
          sendBtnSpinner.classList.add('d-none');
          chatStatus.innerHTML = '<span style="color:var(--success);">✓ Antwort erhalten</span>';
          setTimeout(() => { chatStatus.innerHTML = ''; }, 3000);
          
          // Formular zurücksetzen
          document.getElementById('prompt').value = '';
          
          // Nach kurzer Verzögerung Seite neu laden für aktualisierte History
          setTimeout(() => { location.reload(); }, 1000);
          return;
        }
        
        buffer += decoder.decode(value, { stream: true });
        const lines = buffer.split('\n');
        buffer = lines.pop();
        
        lines.forEach(line => {
          if (line.startsWith('data: ')) {
            try {
              const data = JSON.parse(line.substring(6));
              
              if (data.type === 'agent_selected') {
                currentAgent = data.agent;
                agentBadge.textContent = currentAgent;
              } else if (data.type === 'processing') {
                chatStatus.innerHTML = `<span style="color:var(--info);">${data.message}</span>`;
              } else if (data.type === 'chunk') {
                // Live-Chunk empfangen - append to response
                currentResponse += data.text;
                responseText.textContent = currentResponse;
                chatContainer.scrollTop = chatContainer.scrollHeight;
              } else if (data.type === 'response') {
                currentResponse = data.text;
                responseText.textContent = currentResponse;
                chatContainer.scrollTop = chatContainer.scrollHeight;
              } else if (data.type === 'complete') {
                chatStatus.innerHTML = `<span style="color:var(--success);">${data.message}</span>`;
                
                // In Session speichern
                fetch('/chat/save', {
                  method: 'POST',
                  headers: { 'Content-Type': 'application/json' },
                  body: JSON.stringify({
                    timestamp: data.timestamp,
                    agent: currentAgent,
                    agent_key: agent,
                    prompt: prompt,
                    response: data.response
                  })
                });
                
              } else if (data.type === 'error') {
                responseText.innerHTML = `<span style="color:var(--danger);">⚠️ Fehler: ${escapeHtml(data.message)}</span>`;
                chatStatus.innerHTML = `<span style="color:var(--danger);">Fehler aufgetreten</span>`;
                sendBtn.disabled = false;
                sendBtnText.classList.remove('d-none');
                sendBtnSpinner.classList.add('d-none');
              }
            } catch (e) {
              console.error('Parse error:', e, line);
            }
          }
        });
        
        processChunk();
      });
    }
    
    processChunk();
  })
  .catch(error => {
    chatStatus.innerHTML = `<span style="color:var(--danger);">⚠️ ${error.message}</span>`;
    sendBtn.disabled = false;
    sendBtnText.classList.remove('d-none');
    sendBtnSpinner.classList.add('d-none');
  });
}

function escapeHtml(text) {
  const div = document.createElement('div');
  div.textContent = text;
  return div.innerHTML;
}
</script>
{% endblock %}