/**
 * Alerts API Proxy - Catch-all route
 * Proxies all /api/alerts/* requests to backend
 * Supports: inbox, topics, rules, profile, stats, etc.
 */

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

const BACKEND_URL = process.env.BACKEND_URL || 'http://localhost:8000'

function getForwardHeaders(request: NextRequest): HeadersInit {
  const headers: HeadersInit = {
    'Content-Type': 'application/json',
  }

  // Forward cookie for session auth
  const cookie = request.headers.get('cookie')
  if (cookie) {
    headers['Cookie'] = cookie
  }

  // Forward authorization header if present
  const auth = request.headers.get('authorization')
  if (auth) {
    headers['Authorization'] = auth
  }

  return headers
}

export async function GET(
  request: NextRequest,
  { params }: { params: Promise<{ path: string[] }> }
) {
  const { path } = await params
  const pathStr = path.join('/')
  const searchParams = request.nextUrl.searchParams.toString()
  const url = `${BACKEND_URL}/api/alerts/${pathStr}${searchParams ? `?${searchParams}` : ''}`

  try {
    const response = await fetch(url, {
      method: 'GET',
      headers: getForwardHeaders(request),
      signal: AbortSignal.timeout(30000)
    })

    if (!response.ok) {
      const errorText = await response.text()
      return NextResponse.json(
        { error: `Backend Error: ${response.status}`, details: errorText },
        { status: response.status }
      )
    }

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

export async function POST(
  request: NextRequest,
  { params }: { params: Promise<{ path: string[] }> }
) {
  const { path } = await params
  const pathStr = path.join('/')
  const url = `${BACKEND_URL}/api/alerts/${pathStr}`

  try {
    const body = await request.json()

    const response = await fetch(url, {
      method: 'POST',
      headers: getForwardHeaders(request),
      body: JSON.stringify(body),
      signal: AbortSignal.timeout(30000)
    })

    if (!response.ok) {
      const errorText = await response.text()
      return NextResponse.json(
        { error: `Backend Error: ${response.status}`, details: errorText },
        { status: response.status }
      )
    }

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

export async function PUT(
  request: NextRequest,
  { params }: { params: Promise<{ path: string[] }> }
) {
  const { path } = await params
  const pathStr = path.join('/')
  const url = `${BACKEND_URL}/api/alerts/${pathStr}`

  try {
    const body = await request.json()

    const response = await fetch(url, {
      method: 'PUT',
      headers: getForwardHeaders(request),
      body: JSON.stringify(body),
      signal: AbortSignal.timeout(30000)
    })

    if (!response.ok) {
      const errorText = await response.text()
      return NextResponse.json(
        { error: `Backend Error: ${response.status}`, details: errorText },
        { status: response.status }
      )
    }

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

export async function DELETE(
  request: NextRequest,
  { params }: { params: Promise<{ path: string[] }> }
) {
  const { path } = await params
  const pathStr = path.join('/')
  const url = `${BACKEND_URL}/api/alerts/${pathStr}`

  try {
    const response = await fetch(url, {
      method: 'DELETE',
      headers: getForwardHeaders(request),
      signal: AbortSignal.timeout(30000)
    })

    if (!response.ok) {
      const errorText = await response.text()
      return NextResponse.json(
        { error: `Backend Error: ${response.status}`, details: errorText },
        { status: response.status }
      )
    }

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