import React from 'react';

const metrics = [
  { label: 'Tenants', value: 24, tone: 'gray' },
  { label: 'aktiv', value: 21, tone: 'green' },
  { label: 'gesperrt', value: 2, tone: 'red' },
  { label: 'draft', value: 1, tone: 'yellow' },
  { label: 'Support', value: 3, tone: 'blue' },
  { label: 'Audit', value: 4, tone: 'yellow' },
];

const risks = [
  { label: 'Tenant locked', text: 'DiveBase Demo ist aus Sicherheitsgrund gesperrt.', tone: 'red' },
  { label: 'Konfiguration unvollständig', text: 'Ein Tenant hat UC06 aktiviert, aber keine Einladungsvorlage.', tone: 'yellow' },
];

const links = ['SA-02 Tenants', 'SA-03 Detail', 'SA-04 Anlegen', 'SA-05 Sperren', 'SA-06 Vorlagen', 'SA-07 Support', 'SA-08 Audit'];

function Badge({ children, tone = 'gray' }) {
  const tones = {
    green: 'bg-green-100 text-green-800 border-green-200',
    blue: 'bg-blue-100 text-blue-800 border-blue-200',
    yellow: 'bg-yellow-100 text-yellow-800 border-yellow-200',
    red: 'bg-red-100 text-red-800 border-red-200',
    gray: 'bg-slate-100 text-slate-700 border-slate-200',
  };
  return <span className={`inline-flex rounded-full border px-3 py-1 text-xs font-semibold ${tones[tone]}`}>{children}</span>;
}

function MetricCard({ label, value, tone }) {
  const tones = {
    green: 'border-green-200 bg-green-50 text-green-900',
    blue: 'border-blue-200 bg-blue-50 text-blue-900',
    yellow: 'border-yellow-200 bg-yellow-50 text-yellow-900',
    red: 'border-red-200 bg-red-50 text-red-900',
    gray: 'border-slate-200 bg-slate-50 text-slate-900',
  };
  return (
    <div className={`rounded-2xl border p-4 ${tones[tone]}`}>
      <p className="text-3xl font-bold">{value}</p>
      <p className="mt-1 text-sm font-semibold">{label}</p>
    </div>
  );
}

function Card({ title, children }) {
  return (
    <section className="rounded-2xl border border-slate-200 bg-white p-5 shadow-sm">
      <h2 className="text-lg font-bold">{title}</h2>
      <div className="mt-4">{children}</div>
    </section>
  );
}

export default function SA01SuperadminDashboard() {
  return (
    <div className="min-h-screen bg-slate-50 p-6 text-slate-900">
      <div className="mx-auto max-w-7xl space-y-5">
        <header className="rounded-2xl border border-sky-200 bg-sky-50 p-6 shadow-sm">
          <div className="flex flex-col gap-4 lg:flex-row lg:items-center lg:justify-between">
            <div>
              <p className="text-sm font-semibold uppercase tracking-wide text-sky-700">UC-SA · SA-01</p>
              <h1 className="mt-1 text-3xl font-bold">Superadmin-Dashboard</h1>
              <p className="mt-2 max-w-3xl text-sm text-slate-600">Plattformweite Übersicht über Tenants, Risiken, Support und Audit.</p>
            </div>
            <Badge tone="blue">Rolle: superadmin</Badge>
          </div>
        </header>

        <section className="rounded-2xl border border-slate-200 bg-white p-5 shadow-sm">
          <h2 className="text-lg font-bold">Plattform-Kennzahlen</h2>
          <div className="mt-4 grid gap-4 sm:grid-cols-2 lg:grid-cols-6">
            {metrics.map((metric) => <MetricCard key={metric.label} {...metric} />)}
          </div>
        </section>

        <div className="grid gap-5 lg:grid-cols-2">
          <Card title="Risikohinweise">
            <div className="space-y-4">
              {risks.map((risk) => (
                <div key={risk.label} className="rounded-xl border border-slate-200 bg-slate-50 p-4">
                  <Badge tone={risk.tone}>{risk.label}</Badge>
                  <p className="mt-3 text-sm text-slate-700">{risk.text}</p>
                </div>
              ))}
            </div>
          </Card>

          <Card title="Systemstatus & Audit">
            <div className="flex flex-wrap gap-2">
              <Badge tone="green">Health Checks OK</Badge>
              <Badge tone="yellow">4 Audit-Hinweise offen</Badge>
              <Badge tone="blue">3 Supportprüfungen</Badge>
            </div>
            <p className="mt-4 text-sm text-slate-500">Gefährliche Aktionen werden nicht direkt aus SA-01 ausgeführt.</p>
          </Card>
        </div>

        <Card title="Schnellzugriffe">
          <div className="flex flex-wrap gap-2">
            {links.map((link) => (
              <button key={link} className="rounded-xl border border-slate-300 px-4 py-2 text-sm font-semibold text-slate-700">{link}</button>
            ))}
          </div>
          <p className="mt-4 text-sm text-slate-500">Dashboard zeigt Status und Risiken, keine operativen Kundendetails.</p>
        </Card>

        <section className="rounded-2xl border border-slate-200 bg-white p-5 shadow-sm">
          <h2 className="text-lg font-bold">Sicherheit</h2>
          <p className="mt-2 text-sm text-slate-600">Zugriff nur für superadmin. Supporteinsicht und Statusaktionen erfolgen über Detailansichten mit Protokollierung.</p>
        </section>
      </div>
    </div>
  );
}