/**
 * Live Preview Manager
 * Manages application preview in an iframe
 */

class PreviewManager {
  constructor() {
    this.previewUrl = null;
    this.previewServer = null;
    this.previewPort = null;
    this.isPreviewRunning = false;
  }

  /**
   * Start preview server
   */
  async startPreview(sessionId, workingDir) {
    console.log('Starting preview for session:', sessionId);

    try {
      const res = await fetch(`/claude/api/claude/sessions/${sessionId}/preview/start`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ workingDir })
      });

      const data = await res.json();

      if (!res.ok) {
        throw new Error(data.error || 'Failed to start preview');
      }

      this.previewUrl = data.url;
      this.previewPort = data.port;
      this.previewServer = data.processId;
      this.isPreviewRunning = true;

      console.log('Preview started:', this.previewUrl);

      // Show preview panel
      this.showPreviewPanel(this.previewUrl);

      return data;
    } catch (error) {
      console.error('Error starting preview:', error);
      this.showError(error.message);
      throw error;
    }
  }

  /**
   * Stop preview server
   */
  async stopPreview(sessionId) {
    console.log('Stopping preview for session:', sessionId);

    try {
      const res = await fetch(`/claude/api/claude/sessions/${sessionId}/preview/stop`, {
        method: 'POST'
      });

      const data = await res.json();

      if (!res.ok) {
        throw new Error(data.error || 'Failed to stop preview');
      }

      this.isPreviewRunning = false;
      this.previewUrl = null;
      this.previewServer = null;

      // Hide preview panel
      this.hidePreviewPanel();

      console.log('Preview stopped');

      return data;
    } catch (error) {
      console.error('Error stopping preview:', error);
      throw error;
    }
  }

  /**
   * Refresh preview
   */
  refreshPreview() {
    if (!this.previewUrl || !this.isPreviewRunning) {
      console.warn('No preview to refresh');
      return;
    }

    const iframe = document.getElementById('preview-iframe');
    if (iframe) {
      iframe.src = iframe.src; // Reload iframe
      console.log('Preview refreshed');
    }
  }

  /**
   * Show preview panel
   */
  showPreviewPanel(url) {
    // Remove existing panel
    const existing = document.querySelector('.preview-panel');
    if (existing) {
      existing.remove();
    }

    // Create preview panel
    const previewPanel = document.createElement('div');
    previewPanel.className = 'preview-panel';
    previewPanel.innerHTML = `
      <div class="preview-header">
        <div class="preview-title">
          <h3>Live Preview</h3>
          <span class="preview-url">${url}</span>
        </div>
        <div class="preview-actions">
          <button class="btn btn-secondary btn-sm" onclick="previewManager.refreshPreview()" title="Refresh">
            🔄 Refresh
          </button>
          <button class="btn btn-secondary btn-sm" onclick="previewManager.openInNewTab()" title="Open in new tab">
            🔗 Open
          </button>
          <button class="btn btn-danger btn-sm" onclick="stopCurrentPreview()" title="Stop preview">
            ✕ Stop
          </button>
        </div>
      </div>
      <div class="preview-content">
        <iframe id="preview-iframe" src="${url}" sandbox="allow-scripts allow-same-origin allow-forms allow-popups"></iframe>
      </div>
      <div class="preview-status">
        <span class="status-dot status-running"></span>
        <span>Preview running on ${this.previewPort || 'local port'}</span>
      </div>
    `;

    // Add to page - find best place to insert
    const chatView = document.getElementById('chat-view');
    if (chatView) {
      chatView.appendChild(previewPanel);
    }

    previewPanel.style.display = 'block';
  }

  /**
   * Hide preview panel
   */
  hidePreviewPanel() {
    const panel = document.querySelector('.preview-panel');
    if (panel) {
      panel.remove();
    }
  }

  /**
   * Open preview in new tab
   */
  openInNewTab() {
    if (this.previewUrl) {
      window.open(this.previewUrl, '_blank');
    }
  }

  /**
   * Show error message
   */
  showError(message) {
    // Remove existing error
    const existing = document.querySelector('.preview-error');
    if (existing) {
      existing.remove();
    }

    const error = document.createElement('div');
    error.className = 'preview-error';
    error.innerHTML = `
      <div class="error-header">
        <span class="error-icon">⚠️</span>
        <h4>Preview Error</h4>
        <button class="btn-close" onclick="this.closest('.preview-error').remove()">✕</button>
      </div>
      <div class="error-message">${message}</div>
    `;

    const chatView = document.getElementById('chat-view');
    if (chatView) {
      chatView.appendChild(error);
    }

    error.style.display = 'block';

    // Auto-hide after 5 seconds
    setTimeout(() => {
      error.remove();
    }, 5000);
  }

  /**
   * Update preview status
   */
  updateStatus(status, message) {
    const statusElement = document.querySelector('.preview-status');
    if (statusElement) {
      const dotClass = status === 'running' ? 'status-running' : 'status-stopped';
      statusElement.innerHTML = `
        <span class="status-dot ${dotClass}"></span>
        <span>${message}</span>
      `;
    }
  }
}

// Global instance
const previewManager = new PreviewManager();

// Global function to stop preview
window.stopCurrentPreview = async function() {
  if (window.chatSessionId) {
    await previewManager.stopPreview(window.chatSessionId);
  }
};

// Export for use in other files
if (typeof module !== 'undefined' && module.exports) {
  module.exports = PreviewManager;
}