/**
 * Document Crawler API Proxy - Catch-all route
 * Proxies all /api/sdk/v1/crawler/* requests to document-crawler service (port 8098)
 */

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

const CRAWLER_BACKEND_URL = process.env.CRAWLER_API_URL || 'http://document-crawler:8098'

async function proxyRequest(
  request: NextRequest,
  pathSegments: string[] | undefined,
  method: string
) {
  const pathStr = pathSegments?.join('/') || ''
  const searchParams = request.nextUrl.searchParams.toString()
  const basePath = `${CRAWLER_BACKEND_URL}/api/v1/crawler`
  const url = pathStr
    ? `${basePath}/${pathStr}${searchParams ? `?${searchParams}` : ''}`
    : `${basePath}${searchParams ? `?${searchParams}` : ''}`

  try {
    const headers: HeadersInit = {
      'Content-Type': 'application/json',
    }

    // Forward all relevant headers
    const headerNames = ['authorization', 'x-tenant-id', 'x-user-id', 'x-namespace-id', 'x-tenant-slug']
    for (const name of headerNames) {
      const value = request.headers.get(name)
      if (value) {
        headers[name] = value
      }
    }

    const fetchOptions: RequestInit = {
      method,
      headers,
      signal: AbortSignal.timeout(30000),
    }

    // Forward body for non-GET requests
    if (method !== 'GET' && method !== 'DELETE') {
      try {
        const body = await request.json()
        fetchOptions.body = JSON.stringify(body)
      } catch {
        // No body or non-JSON body
      }
    }

    const response = await fetch(url, fetchOptions)

    if (!response.ok) {
      const errorText = await response.text()
      let errorJson
      try {
        errorJson = JSON.parse(errorText)
      } catch {
        errorJson = { error: errorText }
      }
      return NextResponse.json(
        { error: `Backend Error: ${response.status}`, ...errorJson },
        { status: response.status }
      )
    }

    // Handle 204 No Content
    if (response.status === 204) {
      return new NextResponse(null, { status: 204 })
    }

    const data = await response.json()
    return NextResponse.json(data)
  } catch (error) {
    console.error('Document Crawler API proxy error:', error)
    return NextResponse.json(
      { error: 'Verbindung zum Document Crawler Backend fehlgeschlagen' },
      { status: 503 }
    )
  }
}

export async function GET(
  request: NextRequest,
  { params }: { params: Promise<{ path?: string[] }> }
) {
  const { path } = await params
  return proxyRequest(request, path, 'GET')
}

export async function POST(
  request: NextRequest,
  { params }: { params: Promise<{ path?: string[] }> }
) {
  const { path } = await params
  return proxyRequest(request, path, 'POST')
}

export async function PUT(
  request: NextRequest,
  { params }: { params: Promise<{ path?: string[] }> }
) {
  const { path } = await params
  return proxyRequest(request, path, 'PUT')
}

export async function DELETE(
  request: NextRequest,
  { params }: { params: Promise<{ path?: string[] }> }
) {
  const { path } = await params
  return proxyRequest(request, path, 'DELETE')
}