import express from 'express';
import collaborativeOrchestrator from '../services/collaborativeOrchestrator.js';

const router = express.Router();

/**
 * POST /api/collaborate
 * Create a new collaborative session
 */
router.post('/', async (req, res) => {
  try {
    const { prompt, documentFormat = 'md', agentCount = 7 } = req.body;

    if (!prompt || prompt.trim().length === 0) {
      return res.status(400).json({ error: 'Prompt is required' });
    }

    if (!['md', 'txt'].includes(documentFormat)) {
      return res.status(400).json({ error: 'Document format must be "md" or "txt"' });
    }

    const sessionId = collaborativeOrchestrator.createSession(
      prompt,
      documentFormat,
      Math.min(agentCount, 7)
    );

    const session = collaborativeOrchestrator.getSessionDetails(sessionId);

    res.json({
      sessionId,
      prompt,
      documentFormat,
      status: 'created',
      agents: session.agents.map(a => a.role),
      message: 'Collaborative session created. Start the session to begin collaboration.'
    });

  } catch (error) {
    console.error('Error creating collaborative session:', error);
    res.status(500).json({ error: 'Failed to create collaborative session' });
  }
});

/**
 * POST /api/collaborate/:id/start
 * Start the collaborative session (Lead Architect creates initial document)
 */
router.post('/:id/start', async (req, res) => {
  try {
    const sessionId = parseInt(req.params.id);
    const session = collaborativeOrchestrator.getSession(sessionId);

    if (!session) {
      return res.status(404).json({ error: 'Session not found' });
    }

    if (session.status !== 'ongoing') {
      return res.status(400).json({ error: 'Session is not in ongoing status' });
    }

    // Start the session asynchronously
    res.json({
      sessionId,
      status: 'starting',
      message: 'Session is starting. Initial document is being created...'
    });

    // Start asynchronously without waiting
    collaborativeOrchestrator.startCollaborativeSession(sessionId).catch(error => {
      console.error('Error starting collaborative session:', error);
    });

  } catch (error) {
    console.error('Error starting collaborative session:', error);
    res.status(500).json({ error: 'Failed to start collaborative session' });
  }
});

/**
 * POST /api/collaborate/:id/round
 * Run the next round of reviews
 */
router.post('/:id/round', async (req, res) => {
  try {
    const sessionId = parseInt(req.params.id);
    const session = collaborativeOrchestrator.getSession(sessionId);

    if (!session) {
      return res.status(404).json({ error: 'Session not found' });
    }

    if (session.status !== 'ongoing') {
      return res.status(400).json({ error: 'Session is not in ongoing status' });
    }

    const activeSession = collaborativeOrchestrator.activeSessions.get(sessionId);
    if (!activeSession?.started) {
      return res.status(400).json({ error: 'Session has not been started yet' });
    }

    // Run round asynchronously
    res.json({
      sessionId,
      roundNumber: activeSession.currentRound + 1,
      status: 'running',
      message: 'Review round in progress...'
    });

    // Run asynchronously without waiting
    collaborativeOrchestrator.runRound(sessionId).catch(error => {
      console.error('Error running round:', error);
      collaborativeOrchestrator.broadcast(sessionId, {
        type: 'round_error',
        sessionId,
        error: error.message
      });
    });

  } catch (error) {
    console.error('Error running round:', error);
    res.status(500).json({ error: 'Failed to run round' });
  }
});

/**
 * GET /api/collaborate/:id
 * Get session details with full history and current document
 */
router.get('/:id', (req, res) => {
  try {
    const sessionId = parseInt(req.params.id);
    const session = collaborativeOrchestrator.getSessionDetails(sessionId);

    if (!session) {
      return res.status(404).json({ error: 'Session not found' });
    }

    res.json({
      sessionId: session.id,
      initialPrompt: session.initial_prompt,
      documentFormat: session.document_format,
      status: session.status,
      createdAt: session.created_at,
      completedAt: session.completed_at,
      currentRound: session.currentRound,
      agents: session.agents.map(a => a.role),
      currentDocument: session.currentDocument,
      documentVersionCount: session.versions.length,
      conversationHistory: session.conversationHistory,
      versions: session.versions.map(v => ({
        versionNumber: v.version_number,
        modifiedBy: v.modified_by,
        modificationReason: v.modification_reason,
        roundNumber: v.round_number,
        createdAt: v.created_at
      }))
    });

  } catch (error) {
    console.error('Error fetching session details:', error);
    res.status(500).json({ error: 'Failed to fetch session details' });
  }
});

/**
 * GET /api/collaborate/:id/document
 * Get the current document
 */
router.get('/:id/document', (req, res) => {
  try {
    const sessionId = parseInt(req.params.id);
    const session = collaborativeOrchestrator.getSession(sessionId);

    if (!session) {
      return res.status(404).json({ error: 'Session not found' });
    }

    const activeSession = collaborativeOrchestrator.activeSessions.get(sessionId);
    const currentDocument = activeSession?.currentDocument || '';

    // Determine content type based on format
    const contentType = session.document_format === 'md'
      ? 'text/markdown; charset=utf-8'
      : 'text/plain; charset=utf-8';

    res.set('Content-Type', contentType);
    res.send(currentDocument);

  } catch (error) {
    console.error('Error fetching document:', error);
    res.status(500).json({ error: 'Failed to fetch document' });
  }
});

/**
 * GET /api/collaborate/:id/versions/:versionNumber
 * Get a specific document version
 */
router.get('/:id/versions/:versionNumber', (req, res) => {
  try {
    const sessionId = parseInt(req.params.id);
    const versionNumber = parseInt(req.params.versionNumber);

    const session = collaborativeOrchestrator.getSession(sessionId);
    if (!session) {
      return res.status(404).json({ error: 'Session not found' });
    }

    const versions = collaborativeOrchestrator.getDocumentVersions(sessionId);
    const version = versions.find(v => v.version_number === versionNumber);

    if (!version) {
      return res.status(404).json({ error: 'Version not found' });
    }

    const contentType = session.document_format === 'md'
      ? 'text/markdown; charset=utf-8'
      : 'text/plain; charset=utf-8';

    res.set('Content-Type', contentType);
    res.json({
      versionNumber: version.version_number,
      modifiedBy: version.modified_by,
      modificationReason: version.modification_reason,
      roundNumber: version.round_number,
      createdAt: version.created_at,
      content: version.content
    });

  } catch (error) {
    console.error('Error fetching version:', error);
    res.status(500).json({ error: 'Failed to fetch version' });
  }
});

/**
 * POST /api/collaborate/:id/complete
 * Complete the collaborative session
 */
router.post('/:id/complete', (req, res) => {
  try {
    const sessionId = parseInt(req.params.id);
    const session = collaborativeOrchestrator.getSession(sessionId);

    if (!session) {
      return res.status(404).json({ error: 'Session not found' });
    }

    collaborativeOrchestrator.completeSession(sessionId);

    res.json({
      sessionId,
      status: 'completed',
      message: 'Session completed successfully'
    });

  } catch (error) {
    console.error('Error completing session:', error);
    res.status(500).json({ error: 'Failed to complete session' });
  }
});

export default router;