import React from 'react';

const metrics = [
  { label: 'Vorschläge', value: 21, tone: 'blue' },
  { label: 'ready', value: 14, tone: 'green' },
  { label: 'prüfen', value: 5, tone: 'yellow' },
  { label: 'blockiert', value: 2, tone: 'red' },
  { label: 'queued', value: 3, tone: 'blue' },
  { label: 'sent', value: 46, tone: 'green' },
  { label: 'failed', value: 1, tone: 'red' },
];

const cases = [
  'Maria Keller · DT-1004 · overdue · bereit · E-Mail',
  'Sara Frei · DT-1088 · due_soon · prüfen · Portal',
  'Unbekannt · DT-1220 · unknown · blockiert · E-Mail fehlt',
  'Versandfehler · DT-1011 · SMTP timeout · erneute Prüfung',
];

const workAreas = [
  'BN-02 Vorschläge prüfen',
  'BN-03 Vorschau',
  'BN-04 Einzelversand',
  'BN-05 Sammelversand',
  'BN-07 Vorlagen',
  'BN-08 Regeln',
];

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',
  };
  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>
  );
}

export default function BN01Benachrichtigungsuebersicht() {
  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">UC07 · BN-01</p>
              <h1 className="mt-1 text-3xl font-bold">Benachrichtigungsübersicht</h1>
              <p className="mt-2 max-w-3xl text-sm text-slate-600">Zentrale Übersicht für Vorschläge, Queue, Versandstatus, Fehler und Regeln.</p>
            </div>
            <div className="flex flex-wrap gap-2">
              <button className="rounded-xl border border-slate-300 bg-white px-4 py-2 text-sm font-semibold text-slate-800">UC05</button>
              <button className="rounded-xl border border-slate-300 bg-white px-4 py-2 text-sm font-semibold text-slate-800">BN-06</button>
              <button className="rounded-xl bg-sky-700 px-4 py-2 text-sm font-semibold text-white">Vorschläge</button>
            </div>
          </div>
        </header>

        <section className="rounded-2xl border border-slate-200 bg-white p-5 shadow-sm">
          <h2 className="text-lg font-bold">Status</h2>
          <div className="mt-4 flex flex-wrap gap-2">
            <Badge tone="green">Tenant-Isolation OK</Badge>
            <Badge tone="blue">E-Mail aktiv</Badge>
            <Badge tone="gray">Portal vorbereitet</Badge>
            <Badge tone="yellow">kein Direktversand</Badge>
            <Badge tone="gray">Stand: 2026-05-07 09:30</Badge>
          </div>
        </section>

        <section className="rounded-2xl border border-slate-200 bg-white p-5 shadow-sm">
          <h2 className="text-lg font-bold">Status-Kacheln</h2>
          <div className="mt-4 grid gap-4 sm:grid-cols-2 lg:grid-cols-7">
            {metrics.map((metric) => <MetricCard key={metric.label} {...metric} />)}
          </div>
        </section>

        <div className="grid gap-5 lg:grid-cols-2">
          <section className="rounded-2xl border border-slate-200 bg-white p-5 shadow-sm">
            <h2 className="text-lg font-bold">Arbeitsbereiche</h2>
            <div className="mt-4 grid gap-3 sm:grid-cols-2">
              {workAreas.map((area) => (
                <button key={area} className="rounded-xl border border-slate-300 bg-slate-50 px-4 py-3 text-left text-sm font-semibold text-slate-800">{area}</button>
              ))}
            </div>
          </section>

          <section className="rounded-2xl border border-slate-200 bg-white p-5 shadow-sm">
            <h2 className="text-lg font-bold">Aktuelle Fälle</h2>
            <div className="mt-4 divide-y divide-slate-100">
              {cases.map((item) => <p key={item} className="py-3 text-sm text-slate-700">{item}</p>)}
            </div>
            <div className="mt-4 flex justify-end">
              <button className="rounded-xl bg-sky-700 px-4 py-2 text-sm font-semibold text-white">BN-06 öffnen</button>
            </div>
          </section>
        </div>

        <section className="rounded-2xl border border-slate-200 bg-white p-5 shadow-sm">
          <h2 className="text-lg font-bold">Schnellaktionen</h2>
          <div className="mt-4 flex flex-wrap gap-2">
            <button className="rounded-xl border border-slate-300 px-4 py-2 text-sm font-semibold text-slate-700">BN-02 prüfen</button>
            <button className="rounded-xl border border-slate-300 px-4 py-2 text-sm font-semibold text-slate-700">BN-05 sammeln</button>
            <button className="rounded-xl border border-slate-300 px-4 py-2 text-sm font-semibold text-slate-700">BN-06 Fehler</button>
            <button className="rounded-xl border border-slate-300 px-4 py-2 text-sm font-semibold text-slate-700">UC09 Export</button>
          </div>
          <p className="mt-4 text-sm text-slate-500">BN-01 ist Übersicht. Versand nur über BN-04 / BN-05.</p>
        </section>
      </div>
    </div>
  );
}