/**
 * Communication Admin API Route - Stats Proxy
 *
 * Proxies requests to Matrix/Jitsi admin endpoints
 * Aggregates statistics from both services
 */

import { NextRequest, NextResponse } from 'next/server'

// Service URLs
const CONSENT_SERVICE_URL = process.env.CONSENT_SERVICE_URL || 'http://localhost:8081'
const MATRIX_ADMIN_URL = process.env.MATRIX_ADMIN_URL || 'http://localhost:8448'
const JITSI_URL = process.env.JITSI_URL || 'http://localhost:8443'

// Matrix Admin Token (for Synapse Admin API)
const MATRIX_ADMIN_TOKEN = process.env.MATRIX_ADMIN_TOKEN || ''

interface MatrixStats {
  total_users: number
  active_users: number
  total_rooms: number
  active_rooms: number
  messages_today: number
  messages_this_week: number
  status: 'online' | 'offline' | 'degraded'
}

interface JitsiStats {
  active_meetings: number
  total_participants: number
  meetings_today: number
  average_duration_minutes: number
  peak_concurrent_users: number
  total_minutes_today: number
  status: 'online' | 'offline' | 'degraded'
}

async function fetchMatrixStats(): Promise<MatrixStats> {
  try {
    // Try to get stats from consent service first
    const consentResponse = await fetch(`${CONSENT_SERVICE_URL}/api/v1/communication/admin/stats`, {
      headers: {
        'Content-Type': 'application/json',
      },
    })

    if (consentResponse.ok) {
      const data = await consentResponse.json()
      return {
        total_users: data.matrix?.total_users || 0,
        active_users: data.matrix?.active_users || 0,
        total_rooms: data.matrix?.total_rooms || 0,
        active_rooms: data.matrix?.active_rooms || 0,
        messages_today: data.matrix?.messages_today || 0,
        messages_this_week: data.matrix?.messages_this_week || 0,
        status: 'online'
      }
    }

    // Fallback: Try direct Matrix Admin API
    if (MATRIX_ADMIN_TOKEN) {
      const response = await fetch(`${MATRIX_ADMIN_URL}/_synapse/admin/v1/statistics/users/media`, {
        headers: {
          'Authorization': `Bearer ${MATRIX_ADMIN_TOKEN}`,
        },
      })

      if (response.ok) {
        return {
          total_users: 0,
          active_users: 0,
          total_rooms: 0,
          active_rooms: 0,
          messages_today: 0,
          messages_this_week: 0,
          status: 'online'
        }
      }
    }

    // Check if Matrix is at least reachable
    const healthCheck = await fetch(`${MATRIX_ADMIN_URL}/_matrix/client/versions`, {
      signal: AbortSignal.timeout(5000)
    })

    return {
      total_users: 0,
      active_users: 0,
      total_rooms: 0,
      active_rooms: 0,
      messages_today: 0,
      messages_this_week: 0,
      status: healthCheck.ok ? 'degraded' : 'offline'
    }
  } catch (error) {
    console.error('Matrix stats fetch error:', error)
    return {
      total_users: 0,
      active_users: 0,
      total_rooms: 0,
      active_rooms: 0,
      messages_today: 0,
      messages_this_week: 0,
      status: 'offline'
    }
  }
}

async function fetchJitsiStats(): Promise<JitsiStats> {
  try {
    // Try to get stats from consent service
    const consentResponse = await fetch(`${CONSENT_SERVICE_URL}/api/v1/communication/admin/stats`, {
      headers: {
        'Content-Type': 'application/json',
      },
    })

    if (consentResponse.ok) {
      const data = await consentResponse.json()
      return {
        active_meetings: data.jitsi?.active_meetings || 0,
        total_participants: data.jitsi?.total_participants || 0,
        meetings_today: data.jitsi?.meetings_today || 0,
        average_duration_minutes: data.jitsi?.average_duration_minutes || 0,
        peak_concurrent_users: data.jitsi?.peak_concurrent_users || 0,
        total_minutes_today: data.jitsi?.total_minutes_today || 0,
        status: 'online'
      }
    }

    // Check if Jitsi is at least reachable
    const healthCheck = await fetch(`${JITSI_URL}/http-bind`, {
      method: 'HEAD',
      signal: AbortSignal.timeout(5000)
    })

    return {
      active_meetings: 0,
      total_participants: 0,
      meetings_today: 0,
      average_duration_minutes: 0,
      peak_concurrent_users: 0,
      total_minutes_today: 0,
      status: healthCheck.ok ? 'degraded' : 'offline'
    }
  } catch (error) {
    console.error('Jitsi stats fetch error:', error)
    return {
      active_meetings: 0,
      total_participants: 0,
      meetings_today: 0,
      average_duration_minutes: 0,
      peak_concurrent_users: 0,
      total_minutes_today: 0,
      status: 'offline'
    }
  }
}

export async function GET(request: NextRequest) {
  try {
    // Fetch stats from both services in parallel
    const [matrixStats, jitsiStats] = await Promise.all([
      fetchMatrixStats(),
      fetchJitsiStats()
    ])

    // Try to get active meetings and rooms from consent service
    let activeMeetings: unknown[] = []
    let recentRooms: unknown[] = []

    try {
      const consentResponse = await fetch(`${CONSENT_SERVICE_URL}/api/v1/communication/admin/stats`)
      if (consentResponse.ok) {
        const data = await consentResponse.json()
        activeMeetings = data.active_meetings || []
        recentRooms = data.recent_rooms || []
      }
    } catch {
      // Ignore errors, use empty arrays
    }

    return NextResponse.json({
      matrix: matrixStats,
      jitsi: jitsiStats,
      active_meetings: activeMeetings,
      recent_rooms: recentRooms,
      last_updated: new Date().toISOString()
    })
  } catch (error) {
    console.error('Communication stats error:', error)
    return NextResponse.json(
      {
        error: 'Fehler beim Abrufen der Statistiken',
        matrix: { status: 'offline', total_users: 0, active_users: 0, total_rooms: 0, active_rooms: 0, messages_today: 0, messages_this_week: 0 },
        jitsi: { status: 'offline', active_meetings: 0, total_participants: 0, meetings_today: 0, average_duration_minutes: 0, peak_concurrent_users: 0, total_minutes_today: 0 },
        active_meetings: [],
        recent_rooms: [],
        last_updated: new Date().toISOString()
      },
      { status: 503 }
    )
  }
}