'use client'

/**
 * CookieLibraryPanel — Pro-Cookie-Abgleich gegen die Knowledge-Library:
 * findet als „notwendig" deklarierte Tracker + fehlende Zwecke und zeigt je
 * Befund die Abstellmaßnahme. Lädt aus dem Snapshot (kein Re-Crawl).
 */

import React, { useEffect, useState } from 'react'

export interface CookieFinding {
  vendor: string
  cookie: string
  type: string
  severity: string
  declared: string
  library_purpose: string
  remediation: string
  control?: { control_id?: string | null; regulation?: string; article?: string }
}

interface CheckData {
  summary?: { checked?: number; in_library?: number; findings?: number }
  findings?: CookieFinding[]
  storage_inventory?: {
    total?: number
    by_type?: Record<string, number>
    real_cookies?: number
    other_storage?: number
  }
  drift?: {
    declared_count?: number
    browser_count?: number
    high_findings?: number
    low_findings?: number
  }
}

const SEV_COLOR: Record<string, string> = {
  HIGH: 'bg-red-100 text-red-700',
  MEDIUM: 'bg-amber-100 text-amber-700',
  LOW: 'bg-blue-100 text-blue-700',
}
const TYPE_LABEL: Record<string, string> = {
  tracker_as_necessary: 'Tracker als „notwendig" deklariert',
  missing_purpose: 'Zweck fehlt',
  excessive_lifetime: 'Speicherdauer zu lang',
  vague_duration: 'Speicherdauer nicht konkret',
  missing_retention: 'Keine Speicherdauer/Löschfrist',
  third_country: 'Drittland-Transfer',
  eu_alternative: 'EU-Alternative verfügbar',
  storage_transparency: 'Speichertyp nicht transparent',
}
const STORAGE_LABEL: Record<string, string> = {
  cookie: 'Cookies', local_storage: 'Local Storage',
  session_storage: 'Session Storage', indexeddb: 'IndexedDB',
  framework_storage: 'Framework-Storage',
}

// Pure, testbar.
export function CookieFindingList({ data }: { data: CheckData }) {
  const findings = data.findings || []
  const s = data.summary || {}
  const inv = data.storage_inventory
  const drift = data.drift
  const driftShown =
    !!drift && ((drift.declared_count ?? 0) + (drift.browser_count ?? 0)) > 0
  return (
    <div className="border rounded-lg overflow-hidden">
      {driftShown && (
        <div className="px-4 py-2.5 bg-amber-50 border-b text-xs text-amber-900">
          <span className="font-semibold">Richtlinie ↔ Realität:</span>{' '}
          <strong>{drift!.declared_count ?? 0}</strong> in der Cookie-Richtlinie
          dokumentiert · <strong>{drift!.browser_count ?? 0}</strong> im Browser geladen
          {(drift!.high_findings ?? 0) > 0 && (
            <> · <strong className="text-red-700">{drift!.high_findings} undokumentiert geladen</strong></>
          )}
          {(drift!.low_findings ?? 0) > 0 && (
            <> · {drift!.low_findings} dokumentiert, aber nicht geladen</>
          )}
        </div>
      )}
      {inv && (inv.total ?? 0) > 0 && (
        <div className="px-4 py-2.5 bg-blue-50 border-b text-xs text-blue-900">
          <span className="font-semibold">Storage-Inventar:</span>{' '}
          {inv.total} als „Cookies" gelistet →{' '}
          <strong>{inv.real_cookies} echte Cookies</strong>
          {(inv.other_storage ?? 0) > 0 && (
            <> + <strong className="text-amber-700">{inv.other_storage} andere Endgeräte-Speicher</strong></>
          )}
          {inv.by_type && (
            <span className="text-blue-700 ml-1">
              ({Object.entries(inv.by_type)
                .map(([k, n]) => `${n} ${STORAGE_LABEL[k] || k}`)
                .join(' · ')})
            </span>
          )}
        </div>
      )}
      <div className="px-4 py-2.5 bg-slate-50 border-b text-sm font-semibold text-gray-800">
        Library-Abgleich — {findings.length} Befund{findings.length !== 1 ? 'e' : ''}
        <span className="ml-2 text-xs font-normal text-gray-400">
          {s.in_library ?? 0}/{s.checked ?? 0} Cookies in der Library erkannt
        </span>
      </div>
      {findings.length === 0 ? (
        <div className="px-4 py-3 text-sm text-green-700">
          Keine Abweichungen gegen die Library.
        </div>
      ) : (
        <div className="divide-y divide-gray-100 max-h-96 overflow-auto">
          {findings.map((f, i) => (
            <div key={i} className="px-4 py-2.5 space-y-1">
              <div className="flex items-center gap-2 flex-wrap">
                <span className={`text-[10px] font-semibold px-1.5 py-0.5 rounded ${SEV_COLOR[f.severity] || 'bg-gray-100 text-gray-600'}`}>
                  {f.severity}
                </span>
                <code className="text-xs text-gray-700">{f.cookie}</code>
                <span className="text-xs text-gray-400">· {f.vendor}</span>
                <span className="text-[10px] text-gray-500 ml-auto">
                  {TYPE_LABEL[f.type] || f.type}
                </span>
              </div>
              {f.library_purpose && (
                <div className="text-xs text-gray-500">Library-Zweck: {f.library_purpose}</div>
              )}
              <div className="text-xs text-gray-700">{f.remediation}</div>
              {f.control?.regulation && f.control.regulation !== '—' && (
                <div className="text-[10px] text-gray-400">
                  Rechtsgrundlage: {f.control.regulation} {f.control.article}
                  {f.control.control_id && ` · Control ${f.control.control_id}`}
                </div>
              )}
            </div>
          ))}
        </div>
      )}
    </div>
  )
}

export function CookieLibraryPanel(
  { snapshotId, data: provided }: { snapshotId: string; data?: CheckData },
) {
  const [data, setData] = useState<CheckData | null>(provided ?? null)
  const [loading, setLoading] = useState(!provided)

  useEffect(() => {
    if (provided) { setData(provided); setLoading(false); return }
    let cancelled = false
    fetch(`/api/sdk/v1/agent/snapshots/${snapshotId}/cookie-check`)
      .then(r => r.json())
      .then(d => { if (!cancelled) setData(d) })
      .catch(() => { if (!cancelled) setData({ findings: [] }) })
      .finally(() => { if (!cancelled) setLoading(false) })
    return () => { cancelled = true }
  }, [snapshotId, provided])

  if (loading) return <div className="text-xs text-gray-400">Library-Abgleich läuft…</div>
  return <CookieFindingList data={data || {}} />
}