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"' })
    }

    // Validate agent count
    const validAgentCount = Math.min(Math.max(agentCount, 3), 50)

    const sessionId = collaborativeOrchestrator.createSession(
      prompt,
      documentFormat,
      validAgentCount
    )

    const sessionInfo = collaborativeOrchestrator.getSessionInfo(sessionId)

    res.json({
      sessionId,
      prompt,
      documentFormat,
      agentCount: validAgentCount,
      status: 'created',
      agents: sessionInfo.agents,
      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
 */
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 !== 'created') {
      return res.status(400).json({ error: 'Session has already been started' })
    }

    res.json({
      sessionId,
      status: 'starting',
      message: 'Session is starting. Initial document is being created...'
    })

    // Start asynchronously
    collaborativeOrchestrator.startSession(sessionId).catch(error => {
      console.error('Error starting session:', error)
    })
  } catch (error) {
    console.error('Error starting session:', error)
    res.status(500).json({ error: 'Failed to start 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' })
    }

    const roundNumber = activeSession.conversationHistory.length + 1

    res.json({
      sessionId,
      roundNumber,
      status: 'running',
      message: 'Review round in progress...'
    })

    // Run asynchronously
    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
 */
router.get('/:id', (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 sessionInfo = collaborativeOrchestrator.getSessionInfo(sessionId)
    const versions = collaborativeOrchestrator.getDocumentVersions(sessionId)

    res.json({
      sessionId: sessionInfo.id,
      status: sessionInfo.status,
      agents: sessionInfo.agents,
      agentCount: sessionInfo.agentCount,
      currentRound: sessionInfo.currentRound,
      currentDocument: sessionInfo.currentDocument,
      versionNumber: sessionInfo.versionNumber,
      documentVersionCount: versions.length,
      conversationHistory: sessionInfo.conversationHistory,
      createdAt: session.created_at,
      completedAt: session.completed_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 || ''

    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' })
    }

    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