'use client'

/**
 * Snapshot-Detail — öffnet einen gespeicherten Check aus der Historie und
 * zeigt die Ergebnis-Views aus den Rohdaten (kein Re-Crawl), als Modul-Tabs:
 * Cookies & Tracking + Impressum + Datenschutzerklärung (AGB folgen).
 * Doc-Agenten (Impressum/DSE) laufen beim Öffnen des Tabs auf dem gespeicherten
 * Text — generisch via AgentModuleTab.
 */

import React, { use as useUnwrap, useEffect, useMemo, useState } from 'react'
import Link from 'next/link'

import { CookieLibraryPanel } from '../../_components/CookieLibraryPanel'
import { CookieDeclarationDiff } from '../../_components/CookieDeclarationDiff'
import { CookieResultView } from '../../_components/CookieResultView'
import { AgentModuleTab } from '../../_components/AgentModuleTab'
import { BrowserBehaviorView } from '../../_components/BrowserBehaviorView'
import { AuditReportTab } from '../../_components/AuditReportTab'

export default function SnapshotDetail(
  { params }: { params: Promise<{ snapshotId: string }> },
) {
  const { snapshotId } = useUnwrap(params)
  const [snap, setSnap] = useState<any>(null)
  const [check, setCheck] = useState<any>(null)            // cookie-check
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)
  const [tab, setTab] = useState<string>('')

  useEffect(() => {
    let cancelled = false
    fetch(`/api/sdk/v1/agent/snapshots/${snapshotId}`)
      .then(r => r.json())
      .then(d => {
        if (cancelled) return
        if (d?.error) setError(d.error); else setSnap(d)
      })
      .catch(e => { if (!cancelled) setError(String(e)) })
      .finally(() => { if (!cancelled) setLoading(false) })
    return () => { cancelled = true }
  }, [snapshotId])

  // Cookie-Abgleich einmal laden (Findings + cookie_categories für beide Views).
  useEffect(() => {
    let cancelled = false
    fetch(`/api/sdk/v1/agent/snapshots/${snapshotId}/cookie-check`)
      .then(r => r.json())
      .then(d => { if (!cancelled) setCheck(d) })
      .catch(() => { if (!cancelled) setCheck(null) })
    return () => { cancelled = true }
  }, [snapshotId])

  const docs = snap?.doc_entries || []
  const hasCookies = (snap?.cmp_vendors?.length ?? 0) > 0
  // Browser-Verhalten braucht nur eine scanbare URL (on-demand-Live-Lauf).
  const hasSite = docs.some((e: any) => (e.url || '').trim())
    || (!!snap?.site_domain && snap.site_domain !== 'unknown')

  const modules = useMemo(() => [
    ...(hasCookies ? [{ key: 'cookie', label: 'Cookies & Tracking' }] : []),
    // Doc-Tabs IMMER zeigen; ohne erfassten Text gibt der Tab einen Hinweis
    // ("kein …-Text erfasst") statt zu verschwinden.
    { key: 'impressum', label: 'Impressum' },
    { key: 'dse', label: 'Datenschutzerklärung' },
    { key: 'agb', label: 'AGB' },
    ...(hasSite ? [{ key: 'browser', label: 'Browser-Verhalten' }] : []),
    { key: 'bericht', label: 'Bericht' },
    // eslint-disable-next-line react-hooks/exhaustive-deps
  ], [snap])

  useEffect(() => {
    if (!tab && modules.length) setTab(modules[0].key)
  }, [modules, tab])

  const tabBtn = (key: string, label: string) => (
    <button key={key} onClick={() => setTab(key)}
      className={`px-3 py-1.5 text-sm border-b-2 -mb-px ${tab === key ? 'border-blue-600 text-blue-700 font-medium' : 'border-transparent text-gray-500 hover:text-gray-700'}`}>
      {label}
    </button>
  )

  return (
    <div className="p-6 max-w-6xl space-y-4">
      <Link href="/sdk/agent/snapshots" className="text-xs text-blue-700 hover:underline">
        ‹ Zurück zur Historie
      </Link>
      {loading ? (
        <div className="text-sm text-gray-500">Lade Snapshot…</div>
      ) : error || !snap ? (
        <div className="text-sm text-red-600">Snapshot nicht gefunden.</div>
      ) : modules.length === 0 ? (
        <div className="text-sm text-gray-500">
          Dieser Snapshot enthält keine auswertbaren Daten.
        </div>
      ) : (
        <>
          <div className="flex items-center justify-between gap-3 flex-wrap">
            <div>
              <h1 className="text-lg font-semibold text-gray-900">
                {snap.site_label || snap.site_domain || 'Snapshot'}
              </h1>
              <p className="text-xs text-gray-500">
                {snap.site_domain}
                {snap.created_at ? ` · ${String(snap.created_at).slice(0, 16).replace('T', ' ')}` : ''}
              </p>
            </div>
            {snap.check_id && (
              <a
                href={`/sdk/agent/audit/${snap.check_id}`}
                target="_blank"
                rel="noopener"
                className="px-3 py-1.5 text-sm rounded-lg border border-blue-200 text-blue-700 hover:bg-blue-50 whitespace-nowrap"
              >
                Voll-Audit öffnen (alle MCs) →
              </a>
            )}
          </div>

          <div className="flex gap-1 border-b border-gray-200">
            {modules.map(m => tabBtn(m.key, m.label))}
          </div>

          {tab === 'cookie' && hasCookies && (
            <div className="space-y-4">
              <CookieDeclarationDiff data={check?.declaration_diff} />
              <CookieLibraryPanel snapshotId={snapshotId} data={check ?? undefined} />
              <CookieResultView snapshot={snap} cookieCategories={check?.cookie_categories} storageTypes={check?.storage_inventory?.per_cookie} />
            </div>
          )}

          {tab === 'impressum' && (
            <AgentModuleTab snapshotId={snapshotId} docType="impressum" label="Impressum" />
          )}

          {tab === 'dse' && (
            <AgentModuleTab snapshotId={snapshotId} docType="dse" label="Datenschutzerklärung" />
          )}

          {tab === 'agb' && (
            <AgentModuleTab snapshotId={snapshotId} docType="agb" label="AGB" />
          )}

          {tab === 'browser' && (
            <BrowserBehaviorView snapshotId={snapshotId} />
          )}

          {tab === 'bericht' && (
            <AuditReportTab snapshotId={snapshotId} />
          )}
        </>
      )}
    </div>
  )
}