'use client'

/**
 * P107 — Branchen-Benchmark-Cockpit.
 *
 * Multi-Site-Vergleich auf einen Blick. Anonymize-Toggle für Big-4-
 * Wirtschaftspruefer-Demos.
 *
 * URL: /sdk/benchmark
 */

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

interface Kpi {
  check_id: string
  site_label: string
  site_domain: string
  captured_at: string
  industry: string
  vendors_total: number
  vendors_us: number
  vendors_non_eu: number
  us_pct: number
  non_eu_pct: number
  source_breakdown: Record<string, number>
  max_cookies_per_vendor: number
  avg_cookies_per_vendor: number
  cookies_in_browser: number
  cookies_detailed_count: number
  cookie_doc_chars: number
  banner_detected: boolean
  banner_provider: string
  banner_violations: number
  compliance_score: number | null
  saving_low_eur: number
  saving_high_eur: number
  data_quality_pct: number
}

interface Summary {
  n_sites: number
  avg_vendors: number
  avg_us_pct: number
  avg_non_eu_pct: number
  avg_cookies_browser: number
  avg_score: number
  max_vendors: number
  max_saving_high: number
  total_saving_low: number
  total_saving_high: number
}

const INDUSTRIES = [
  { id: '',           label: 'Alle Branchen' },
  { id: 'automotive', label: 'Automotive (OEM)' },
  { id: 'banking',    label: 'Banking / Finance' },
  { id: 'chemistry',  label: 'Chemie / Pharma' },
  { id: 'luftfahrt',  label: 'Luftfahrt' },
  { id: 'ecommerce',  label: 'E-Commerce' },
  { id: 'saas',       label: 'SaaS / Software' },
]

const PRESET_GROUPS = [
  { id: 'automotive_oem',  label: 'Automotive OEMs',     sites: 'Volkswagen,BMW,Mercedes-Benz,SEAT,AUDI' },
  { id: 'automotive_supl', label: 'Automotive Zulieferer', sites: 'ZF Friedrichshafen,Robert Bosch,Continental' },
  { id: 'chemie',          label: 'Chemie (DAX)',        sites: 'BASF,Bayer,Henkel,Linde' },
  { id: 'luftfahrt',       label: 'Luftfahrt',           sites: 'Lufthansa,Eurowings,Condor' },
  { id: 'banking',         label: 'Banking (DAX)',       sites: 'Deutsche Bank,Commerzbank,DZ Bank,KfW' },
]

export default function BenchmarkPage() {
  const [industry,   setIndustry]   = useState('')
  const [sites,      setSites]      = useState('')
  const [anonymized, setAnonymized] = useState(false)
  const [data,       setData]       = useState<{kpis: Kpi[]; summary: Summary} | null>(null)
  const [loading,    setLoading]    = useState(false)
  const [error,      setError]      = useState<string | null>(null)

  const fetchData = async () => {
    setLoading(true); setError(null)
    try {
      const url = new URL('/api/compliance/admin/benchmark', window.location.origin)
      if (industry) url.searchParams.set('industry', industry)
      if (sites)    url.searchParams.set('sites', sites)
      if (anonymized) url.searchParams.set('anonymized', 'true')
      const r = await fetch(url.toString())
      if (!r.ok) throw new Error(`HTTP ${r.status}`)
      setData(await r.json())
    } catch (e: any) {
      setError(e.message || String(e))
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => { fetchData() }, [])

  return (
    <div className="p-6 max-w-7xl mx-auto">
      <header className="mb-6">
        <h1 className="text-2xl font-bold text-gray-900">
          Branchen-Benchmark-Cockpit
        </h1>
        <p className="text-sm text-gray-600 mt-1">
          DAX-Konzern-Vergleich auf Basis aller bisher gepruefter Sites.
          Mit Anonymize-Toggle fuer Wirtschaftspruefer-Demos.
        </p>
      </header>

      {/* Filter-Leiste */}
      <div className="bg-white border border-gray-200 rounded-lg p-4 mb-4 flex flex-wrap gap-3 items-end">
        <div>
          <label className="block text-xs font-medium text-gray-700 mb-1">Branche</label>
          <select value={industry} onChange={e => setIndustry(e.target.value)}
                  className="px-3 py-2 border rounded text-sm">
            {INDUSTRIES.map(i => <option key={i.id} value={i.id}>{i.label}</option>)}
          </select>
        </div>
        <div className="flex-1 min-w-[300px]">
          <label className="block text-xs font-medium text-gray-700 mb-1">
            Sites (komma-getrennt) oder Preset wählen
          </label>
          <input value={sites} onChange={e => setSites(e.target.value)}
                 placeholder="Volkswagen,BMW,Mercedes-Benz"
                 className="w-full px-3 py-2 border rounded text-sm font-mono" />
          <div className="flex flex-wrap gap-1 mt-1">
            {PRESET_GROUPS.map(p => (
              <button key={p.id} onClick={() => setSites(p.sites)}
                      className="px-2 py-0.5 text-[10px] bg-gray-100 hover:bg-gray-200 rounded">
                {p.label}
              </button>
            ))}
          </div>
        </div>
        <label className="flex items-center gap-2 text-sm cursor-pointer">
          <input type="checkbox" checked={anonymized}
                 onChange={e => setAnonymized(e.target.checked)}
                 className="rounded" />
          <span><strong>Anonymisieren</strong> (OEM 1/2/3 statt Hersteller-Namen)</span>
        </label>
        <button onClick={fetchData} disabled={loading}
                className="px-4 py-2 bg-purple-600 text-white rounded font-medium hover:bg-purple-700 disabled:opacity-50">
          {loading ? 'Lade…' : 'Aktualisieren'}
        </button>
      </div>

      {error && (
        <div className="bg-red-50 border border-red-200 text-red-700 rounded p-3 text-sm mb-4">
          Fehler: {error}
        </div>
      )}

      {/* Summary-KPIs */}
      {data?.summary && (
        <div className="grid grid-cols-2 md:grid-cols-5 gap-2 mb-4">
          <Kpi label="Sites im Vergleich"    value={data.summary.n_sites} />
          <Kpi label="⌀ Vendors"             value={data.summary.avg_vendors} />
          <Kpi label="⌀ US-Anteil"           value={`${data.summary.avg_us_pct}%`}
               tone={data.summary.avg_us_pct > 60 ? 'warn' : 'ok'} />
          <Kpi label="⌀ Score"               value={data.summary.avg_score || '—'} />
          <Kpi label="Saving-Potenzial (Σ)"  value={`${Math.round(data.summary.total_saving_high/1000)}k €`}
               tone="ok" />
        </div>
      )}

      {/* Vergleichstabelle */}
      {data?.kpis && data.kpis.length > 0 ? (
        <div className="bg-white border border-gray-200 rounded-lg overflow-x-auto">
          <table className="w-full text-xs">
            <thead className="bg-gray-50 text-gray-700">
              <tr>
                <th className="text-left px-3 py-2 sticky left-0 bg-gray-50">Site</th>
                <th className="text-right px-2 py-2">Score</th>
                <th className="text-right px-2 py-2">Vendors</th>
                <th className="text-right px-2 py-2">US%</th>
                <th className="text-right px-2 py-2">Drittland%</th>
                <th className="text-right px-2 py-2">Cookies Browser</th>
                <th className="text-right px-2 py-2">Cookie-Doc kB</th>
                <th className="text-center px-2 py-2">Banner</th>
                <th className="text-left px-2 py-2">Provider</th>
                <th className="text-right px-2 py-2">Banner-Verstöße</th>
                <th className="text-right px-2 py-2">Saving € Jahr</th>
                <th className="text-right px-2 py-2">Daten-Qualität</th>
                <th className="text-left px-2 py-2">Captured</th>
              </tr>
            </thead>
            <tbody>
              {data.kpis.map((k, i) => (
                <tr key={i} className={`border-t hover:bg-gray-50 ${i%2 ? 'bg-gray-50/30' : ''}`}>
                  <td className="px-3 py-2 font-semibold sticky left-0 bg-inherit">
                    {k.site_label}
                    <div className="text-[9px] text-gray-400 font-mono">{k.check_id}</div>
                  </td>
                  <td className={`px-2 py-2 text-right ${
                    !k.compliance_score ? 'text-gray-400' :
                    k.compliance_score >= 80 ? 'text-green-700' :
                    k.compliance_score >= 60 ? 'text-amber-700' : 'text-red-700'
                  }`}>
                    {k.compliance_score ?? '—'}
                  </td>
                  <td className="px-2 py-2 text-right font-mono">{k.vendors_total}</td>
                  <td className={`px-2 py-2 text-right ${k.us_pct > 60 ? 'text-red-700 font-semibold' : ''}`}>
                    {k.us_pct}%
                  </td>
                  <td className={`px-2 py-2 text-right ${k.non_eu_pct > 70 ? 'text-red-700' : ''}`}>
                    {k.non_eu_pct}%
                  </td>
                  <td className="px-2 py-2 text-right font-mono">{k.cookies_in_browser}</td>
                  <td className="px-2 py-2 text-right text-gray-500">
                    {Math.round(k.cookie_doc_chars / 1000)}k
                  </td>
                  <td className="px-2 py-2 text-center">{k.banner_detected ? '✓' : '✗'}</td>
                  <td className="px-2 py-2 text-gray-600">{k.banner_provider || '—'}</td>
                  <td className={`px-2 py-2 text-right ${k.banner_violations ? 'text-red-700' : 'text-gray-400'}`}>
                    {k.banner_violations || 0}
                  </td>
                  <td className="px-2 py-2 text-right text-green-700 font-mono">
                    {k.saving_high_eur ? `${(k.saving_high_eur/1000).toFixed(0)}k` : '—'}
                  </td>
                  <td className={`px-2 py-2 text-right ${
                    k.data_quality_pct >= 70 ? 'text-green-700' :
                    k.data_quality_pct >= 40 ? 'text-amber-700' : 'text-red-700'
                  }`}>
                    {k.data_quality_pct}%
                  </td>
                  <td className="px-2 py-2 text-[10px] text-gray-500">
                    {k.captured_at?.substring(0, 16).replace('T', ' ')}
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      ) : !loading && (
        <div className="bg-gray-50 border border-gray-200 rounded-lg p-8 text-center text-gray-500">
          Keine Snapshots gefunden — Filter anpassen oder einen Audit-Lauf starten.
        </div>
      )}

      <div className="mt-4 text-xs text-gray-500">
        <strong>Big-4-Hinweis:</strong> Mit Anonymize-Toggle koennen wir den
        kompletten Branchen-Cut zeigen ohne Hersteller-Namen zu nennen
        (z.B. "OEM 3 hat 78% US-Vendor-Anteil"). Damit ist die Daten-
        Hoheit bei BreakPilot und Big 4 sieht den Mehrwert ohne dass
        Wettbewerber-Vergleiche extern werden.
      </div>
    </div>
  )
}

function Kpi({ label, value, tone = 'neutral' }: {
  label: string; value: any; tone?: 'ok' | 'warn' | 'bad' | 'neutral'
}) {
  const colors: Record<string, string> = {
    ok: 'text-green-700 bg-green-50 border-green-200',
    warn: 'text-amber-700 bg-amber-50 border-amber-200',
    bad: 'text-red-700 bg-red-50 border-red-200',
    neutral: 'text-gray-700 bg-white border-gray-200',
  }
  return (
    <div className={`border rounded p-3 ${colors[tone]}`}>
      <div className="text-[10px] uppercase tracking-wider opacity-70">{label}</div>
      <div className="text-xl font-bold mt-1">{value}</div>
    </div>
  )
}