import { NextResponse } from 'next/server'

interface ServiceCheck {
  name: string
  port: number
  category: 'core' | 'ai' | 'database' | 'storage'
  url: string
  expectJson?: boolean
}

const SERVICES: ServiceCheck[] = [
  // Core Services
  { name: 'Backend API', port: 8002, category: 'core', url: 'http://backend-compliance:8002/health' },
  { name: 'AI Compliance SDK', port: 8093, category: 'core', url: 'http://ai-compliance-sdk:8090/health' },
  { name: 'Consent Service', port: 8081, category: 'core', url: 'http://bp-core-consent-service:8081/health' },
  { name: 'TTS Service', port: 8095, category: 'core', url: 'http://compliance-tts-service:8095/health' },
  // AI / LLM
  { name: 'Ollama/LLM', port: 11434, category: 'ai', url: `${process.env.OLLAMA_URL || 'http://host.docker.internal:11434'}/api/tags`, expectJson: true },
  { name: 'Embedding Service', port: 8087, category: 'ai', url: 'http://bp-core-embedding-service:8087/health' },
  { name: 'RAG Service', port: 8089, category: 'ai', url: 'http://bp-core-rag-service:8089/health' },
  // Databases
  { name: 'Qdrant (Vector DB)', port: 6333, category: 'database', url: 'http://bp-core-qdrant:6333/readyz' },
  { name: 'Valkey (Cache)', port: 6379, category: 'database', url: '' }, // TCP only, checked via SDK health
  { name: 'MinIO (S3)', port: 9000, category: 'storage', url: 'http://bp-core-minio:9000/minio/health/live' },
]

async function checkService(service: ServiceCheck): Promise<{
  name: string
  port: number
  category: string
  status: 'online' | 'offline' | 'degraded'
  responseTime?: number
  details?: string
}> {
  if (!service.url) {
    // Can't HTTP-check TCP-only services — mark as degraded with hint
    return { name: service.name, port: service.port, category: service.category, status: 'degraded', details: 'Kein HTTP-Health-Endpoint' }
  }

  const start = Date.now()
  try {
    const controller = new AbortController()
    const timeout = setTimeout(() => controller.abort(), 5000)

    const res = await fetch(service.url, { signal: controller.signal, cache: 'no-store' })
    clearTimeout(timeout)

    const responseTime = Date.now() - start

    if (res.ok) {
      let details: string | undefined
      if (service.expectJson) {
        try {
          const data = await res.json()
          if (data.models) {
            details = `${data.models.length} Modelle`
          }
        } catch { /* ignore */ }
      }
      return { name: service.name, port: service.port, category: service.category, status: 'online', responseTime, details }
    }

    return { name: service.name, port: service.port, category: service.category, status: 'degraded', responseTime, details: `HTTP ${res.status}` }
  } catch (err) {
    return {
      name: service.name,
      port: service.port,
      category: service.category,
      status: 'offline',
      details: err instanceof Error && err.name === 'AbortError' ? 'Timeout (5s)' : 'Nicht erreichbar',
    }
  }
}

export async function GET() {
  const results = await Promise.all(SERVICES.map(checkService))

  return NextResponse.json({
    services: results,
    timestamp: new Date().toISOString(),
  })
}