// TIJDELIJKE debug-pagina om te checken of env-vars op deze deployment
// daadwerkelijk een (juiste) waarde hebben. Geen secrets gelekt — alleen
// metadata: lengte, hostname en pooled-flag voor DB-URLs.
//
// VERWIJDEREN zodra env-config op Vercel bevestigd is.

import { headers } from 'next/headers'
import { notFound } from 'next/navigation'

export const dynamic = 'force-dynamic'
export const runtime = 'nodejs'

interface VarStatus {
  name: string
  set: boolean
  length: number
  host?: string
  pooled?: boolean
  parseError?: string
}

function inspectUrl(name: string, raw: string | undefined): VarStatus {
  if (!raw) return { name, set: false, length: 0 }
  try {
    const url = new URL(raw)
    return {
      name,
      set: true,
      length: raw.length,
      host: url.hostname,
      pooled: url.hostname.includes('pooler.'),
    }
  } catch (e) {
    return {
      name,
      set: true,
      length: raw.length,
      parseError: e instanceof Error ? e.message : String(e),
    }
  }
}

function inspectSecret(name: string, raw: string | undefined): VarStatus {
  if (!raw) return { name, set: false, length: 0 }
  return { name, set: true, length: raw.length }
}

export default async function DebugEnvPage() {
  // Productie-guard: lekt env-var-metadata (hostnames, lengtes, pooled-flag).
  if (process.env.NODE_ENV === 'production') notFound()

  // Force dynamic so each visit reads runtime env (niet build-time gecached)
  await headers()

  const vars: VarStatus[] = [
    inspectUrl('DATABASE_URL', process.env.DATABASE_URL),
    inspectUrl('DIRECT_URL', process.env.DIRECT_URL),
    inspectSecret('SESSION_SECRET', process.env.SESSION_SECRET),
  ]

  const node = process.env.NODE_ENV ?? '(unset)'
  const vercel = process.env.VERCEL_ENV ?? '(unset)'
  const url = process.env.VERCEL_URL ?? '(unset)'
  const region = process.env.VERCEL_REGION ?? '(unset)'

  return (
    <div style={{ fontFamily: 'monospace', padding: 16, maxWidth: 1000 }}>
      <h1 style={{ fontSize: 18, fontWeight: 'bold' }}>Env-var debug</h1>
      <p style={{ fontSize: 13, color: '#666' }}>
        Server-side gerenderd. Toont alleen metadata, geen waardes. Verwijderen na env-config check.
      </p>

      <h2 style={{ fontSize: 15, marginTop: 16 }}>Runtime</h2>
      <table style={{ borderCollapse: 'collapse', fontSize: 13 }}>
        <tbody>
          <tr><td style={{ padding: 4, paddingRight: 16 }}>NODE_ENV</td><td>{node}</td></tr>
          <tr><td style={{ padding: 4 }}>VERCEL_ENV</td><td>{vercel}</td></tr>
          <tr><td style={{ padding: 4 }}>VERCEL_URL</td><td>{url}</td></tr>
          <tr><td style={{ padding: 4 }}>VERCEL_REGION</td><td>{region}</td></tr>
        </tbody>
      </table>

      <h2 style={{ fontSize: 15, marginTop: 24 }}>Variables</h2>
      <table style={{ width: '100%', borderCollapse: 'collapse', fontSize: 13 }}>
        <thead>
          <tr style={{ background: '#f0f0f0', textAlign: 'left' }}>
            <th style={{ padding: 6, border: '1px solid #ddd' }}>name</th>
            <th style={{ padding: 6, border: '1px solid #ddd' }}>set</th>
            <th style={{ padding: 6, border: '1px solid #ddd' }}>length</th>
            <th style={{ padding: 6, border: '1px solid #ddd' }}>host</th>
            <th style={{ padding: 6, border: '1px solid #ddd' }}>pooled</th>
            <th style={{ padding: 6, border: '1px solid #ddd' }}>parse_error</th>
          </tr>
        </thead>
        <tbody>
          {vars.map((v) => (
            <tr key={v.name}>
              <td style={{ padding: 6, border: '1px solid #ddd' }}>{v.name}</td>
              <td style={{ padding: 6, border: '1px solid #ddd', color: v.set ? 'green' : 'red' }}>
                {v.set ? 'yes' : 'NO'}
              </td>
              <td style={{ padding: 6, border: '1px solid #ddd' }}>{v.length}</td>
              <td style={{ padding: 6, border: '1px solid #ddd' }}>{v.host ?? '—'}</td>
              <td style={{ padding: 6, border: '1px solid #ddd', color: v.pooled ? 'orange' : 'inherit' }}>
                {v.pooled === undefined ? '—' : v.pooled ? 'yes (LISTEN may not work)' : 'no'}
              </td>
              <td style={{ padding: 6, border: '1px solid #ddd', color: 'red' }}>
                {v.parseError ?? '—'}
              </td>
            </tr>
          ))}
        </tbody>
      </table>
    </div>
  )
}