import { NextRequest, NextResponse } from 'next/server'
import { createClient } from '@/lib/supabase/server'
import { getLicServerConfig } from '@/lib/actions/licserver-config'
import type { PartnerDto, LicServerProblemDetails } from '@/lib/types/licserver'

/**
 * GET /api/licserver/partners/[id]
 *
 * Proxy to LicServer GET /api-v1/partners/{id}
 * [id] must be a valid UUID.
 *
 * Secured: requires a valid Supabase session.
 * base_url + api_key are read from DB settings (admin-configurable),
 * with fallback to LICSERVER_BASE_URL / LICSERVER_API_KEY env vars.
 */
export async function GET(
  _req: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  // ── Auth guard ─────────────────────────────────────────────────────────
  const supabase = await createClient()
  const { data: { user } } = await supabase.auth.getUser()
  if (!user) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
  }

  // ── Load config from DB (falls back to env vars) ──────────────────────
  const cfg = await getLicServerConfig()
  if (!cfg.base_url || !cfg.api_key) {
    console.error('[licserver] base_url or api_key not configured (DB or env)')
    return NextResponse.json(
      { error: 'LicServer nicht konfiguriert. Bitte in den Admin-Einstellungen hinterlegen.' },
      { status: 503 }
    )
  }

  const { id } = await params

  // Basic UUID format guard
  const UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i
  if (!UUID_RE.test(id)) {
    return NextResponse.json({ error: 'Invalid partner ID' }, { status: 400 })
  }

  // ── Proxy request ──────────────────────────────────────────────────────
  try {
    const res = await fetch(
      `${cfg.base_url}/api-v1/partners/${id}`,
      {
        method:  'GET',
        headers: {
          'X-Api-Key': cfg.api_key,
          'Accept':    'application/json',
        },
        signal: AbortSignal.timeout(5_000),
      }
    )

    if (!res.ok) {
      const problem: LicServerProblemDetails = await res.json().catch(() => ({}))
      return NextResponse.json(problem, { status: res.status })
    }

    const data: PartnerDto = await res.json()
    return NextResponse.json(data)

  } catch (err) {
    console.error('[licserver] partner/:id fetch error:', err)
    return NextResponse.json(
      { error: 'LicServer nicht erreichbar' },
      { status: 502 }
    )
  }
}