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

/**
 * GET /api/licserver/partners
 *
 * Proxy to LicServer GET /api-v1/partners
 * Query params forwarded: search, page, pageSize
 *
 * 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) {
  // ── 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 }
    )
  }

  // ── Forward query params ───────────────────────────────────────────────
  const { searchParams } = req.nextUrl
  const upstream = new URL(`${cfg.base_url}/api-v1/partners`)
  const search   = searchParams.get('search')
  const page     = searchParams.get('page')
  const pageSize = searchParams.get('pageSize')
  if (search)   upstream.searchParams.set('search',   search)
  if (page)     upstream.searchParams.set('page',     page)
  if (pageSize) upstream.searchParams.set('pageSize', pageSize)

  // ── Proxy request ──────────────────────────────────────────────────────
  try {
    const res = await fetch(upstream.toString(), {
      method:  'GET',
      headers: {
        'X-Api-Key': cfg.api_key,
        'Accept':    'application/json',
      },
      // Internal container network — short timeout
      signal: AbortSignal.timeout(5_000),
    })

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

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

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