// ── Chat Page ──

registerPage('chat', {
  async init(params) {
    const sessionId = params.id;
    if (!sessionId) return navigateTo('dashboard');

    currentSessionId = sessionId;

    const session = await apiGetSession(sessionId);
    if (!session) return navigateTo('dashboard');

    // Kein Agent = kein Chat
    if (!session.agentId) {
      navigateTo('session', { id: sessionId });
      return;
    }

    const titleEl = document.getElementById('sessionTitle');
    if (titleEl) {
      titleEl.textContent = session.name || 'Unbenannt';
    }

    // Zurück zur Session-Edit-Seite
    const backBtn = document.getElementById('chatBackBtn');
    if (backBtn) {
      backBtn.addEventListener('click', () => navigateTo('session', { id: sessionId }));
    }

    // Send
    const sendBtn = document.getElementById('send');
    if (sendBtn) sendBtn.addEventListener('click', sendMessage);

    // Ctrl+Enter
    const inputEl = document.getElementById('input');
    if (inputEl) {
      inputEl.addEventListener('keydown', (e) => {
        if (e.ctrlKey && e.key === 'Enter') sendMessage();
      });
      inputEl.addEventListener('input', function () {
        this.style.height = 'auto';
        this.style.height = Math.min(this.scrollHeight, 150) + 'px';
      });
    }

    // File Upload
    const fileBtn = document.getElementById('fileBtn');
    const fileInput = document.getElementById('fileInput');
    if (fileBtn && fileInput) {
      fileBtn.addEventListener('click', () => fileInput.click());
      fileInput.addEventListener('change', (e) => {
        if (e.target.files.length > 0) handleMultipleFiles(e.target.files);
      });
    }

    // Drag & Drop
    const chatContainer = document.querySelector('.chat-page');
    if (chatContainer) {
      chatContainer.addEventListener('dragover', (e) => { e.preventDefault(); e.stopPropagation(); });
      chatContainer.addEventListener('drop', (e) => {
        e.preventDefault();
        e.stopPropagation();
        if (e.dataTransfer.files.length > 0) handleMultipleFiles(e.dataTransfer.files);
      });
    }

    // Paste
    if (inputEl) {
      inputEl.addEventListener('paste', (e) => {
        const items = e.clipboardData?.items;
        if (!items) return;
        for (const item of items) {
          if (item.kind === 'file') {
            e.preventDefault();
            handleFileSelect(item.getAsFile());
            return;
          }
        }
      });
    }

    // Archivieren
    const archiveBtn = document.getElementById('archiveBtn');
    if (archiveBtn) archiveBtn.addEventListener('click', clearChat);

    // State zurücksetzen und History laden
    messages.length = 0;
    lastKnownMessageId = 0;
    loadedArchiveCount = 0;
    isStreaming = false;

    await loadHistory();
  },

  destroy() {
    stopHistoryPolling();
    messages.length = 0;
    lastKnownMessageId = 0;
    loadedArchiveCount = 0;
    isStreaming = false;
    clearPendingFiles();
  }
});