'use client'

/**
 * CookieDeclarationDiff — „Deklaration vs. Bibliothek".
 *
 * Zeigt pro Cookie der GEPRÜFTEN Teilmenge (Library-Treffer) die Feld-
 * Abweichungen deklariert → Library, plus einen ehrlichen Funnel
 * (gesamt → geprüft → abweichend). Quelle: cookie-check `declaration_diff`.
 */

import React from 'react'

interface Diff {
  field: string
  declared: string
  expected: string
  severe?: boolean
}
interface DiffRow {
  cookie: string
  vendor: string
  severity: string
  diffs: Diff[]
  measures: string[]
}
export interface DeclarationDiffData {
  coverage: { total: number; checked: number; discrepant: number }
  rows: DiffRow[]
}

const SEV_BADGE: Record<string, string> = {
  HIGH: 'bg-red-100 text-red-700',
  MEDIUM: 'bg-amber-100 text-amber-700',
  LOW: 'bg-gray-100 text-gray-600',
}

function Funnel({ c }: { c: DeclarationDiffData['coverage'] }) {
  const pct = c.total > 0 ? Math.round((c.checked / c.total) * 100) : 0
  return (
    <div className="text-xs text-gray-600 bg-slate-50 border border-gray-200 rounded-lg px-3 py-2">
      <span className="font-semibold text-gray-800">{c.total}</span> Cookies ·{' '}
      <span className="font-semibold text-gray-800">{c.checked}</span> gegen Bibliothek
      geprüft (<span className="font-semibold">{pct}%</span>) · davon{' '}
      <span className={`font-semibold ${c.discrepant > 0 ? 'text-red-700' : 'text-green-700'}`}>
        {c.discrepant}
      </span>{' '}
      mit abweichender Deklaration
      <div className="text-[10px] text-gray-400 mt-0.5">
        Nicht in der Bibliothek enthaltene Cookies sind nicht prüfbar (kein Pass, kein Fail).
      </div>
    </div>
  )
}

export function CookieDeclarationDiff({ data }: { data?: DeclarationDiffData }) {
  if (!data || !data.coverage) return null
  const { coverage, rows } = data
  return (
    <div className="space-y-3">
      <div className="flex items-baseline justify-between gap-2">
        <h3 className="text-sm font-semibold text-gray-900">Deklaration vs. Bibliothek</h3>
      </div>
      <Funnel c={coverage} />

      {rows.length === 0 ? (
        <p className="text-xs text-green-700 px-1">
          Keine abweichenden Deklarationen in der geprüften Teilmenge.
        </p>
      ) : (
        <div className="space-y-2">
          {rows.map((r, i) => (
            <div key={i} className="border border-gray-200 rounded-lg overflow-hidden">
              <div className="flex items-center gap-2 px-3 py-1.5 bg-slate-50 border-b text-xs">
                <span className="font-mono font-medium text-gray-800 break-all">{r.cookie}</span>
                {r.vendor && <span className="text-gray-400">· {r.vendor}</span>}
                <span className="flex-1" />
                <span className={`px-1.5 py-0.5 rounded text-[10px] ${SEV_BADGE[r.severity] || SEV_BADGE.LOW}`}>
                  {r.diffs.length} {r.diffs.length === 1 ? 'Abweichung' : 'Abweichungen'}
                </span>
              </div>
              <div className="px-3 py-2 space-y-1">
                {r.diffs.map((d, j) => (
                  <div key={j} className="flex items-center gap-2 text-[11px]">
                    <span className="text-gray-500 w-20 shrink-0">{d.field}</span>
                    <span className="text-gray-600">{d.declared}</span>
                    <span className="text-gray-400">→</span>
                    <span className={`font-medium ${d.severe ? 'text-red-700' : 'text-gray-900'}`}>
                      {d.expected}
                    </span>
                  </div>
                ))}
                {r.measures.length > 0 && (
                  <div className="text-[11px] text-blue-700 pt-1 border-t border-gray-100 mt-1">
                    <span className="font-medium">Maßnahme:</span> {r.measures.join(' ')}
                  </div>
                )}
              </div>
            </div>
          ))}
        </div>
      )}
    </div>
  )
}