/**
 * Escalations API Proxy - Catch-all route
 * Proxies all /api/sdk/v1/escalations/* requests to backend-compliance
 */

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

const BACKEND_URL = process.env.BACKEND_API_URL || 'http://backend-compliance:8002'

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

  try {
    const headers: HeadersInit = {
      'Content-Type': 'application/json',
      'X-Tenant-Id': '9282a473-5c95-4b3a-bf78-0ecc0ec71d3e',
      'X-User-Id': 'admin',
    }

    const authHeader = request.headers.get('authorization')
    if (authHeader) {
      headers['Authorization'] = authHeader
    }

    const tenantHeader = request.headers.get('x-tenant-id')
    if (tenantHeader) {
      headers['X-Tenant-Id'] = tenantHeader
    }

    const userIdHeader = request.headers.get('x-user-id')
    if (userIdHeader) {
      headers['X-User-Id'] = userIdHeader
    }

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

    if (['POST', 'PUT', 'PATCH'].includes(method)) {
      const contentType = request.headers.get('content-type')
      if (contentType?.includes('application/json')) {
        try {
          const text = await request.text()
          if (text && text.trim()) {
            fetchOptions.body = text
          }
        } catch {
          // Empty or invalid 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 }
      )
    }

    const data = await response.json()
    return NextResponse.json(data)
  } catch (error) {
    console.error('Escalations API proxy error:', error)
    return NextResponse.json(
      { error: 'Verbindung zum 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 PATCH(
  request: NextRequest,
  { params }: { params: Promise<{ path?: string[] }> }
) {
  const { path } = await params
  return proxyRequest(request, path, 'PATCH')
}

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