import React from 'react';

const placeholders = [
  'customer_name → Maria Keller',
  'equipment_label → DT-1004',
  'equipment_type → Stahlflasche 12 l',
  'due_date → 2026-04-25',
  'days_overdue → 12',
  'tenant_name → Tauchschule Hochrhein',
];

const checks = [
  { label: 'Empfänger OK', tone: 'green' },
  { label: 'Kanal OK', tone: 'green' },
  { label: 'Platzhalter OK', tone: 'green' },
  { label: 'keine internen Notizen', tone: 'green' },
];

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 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>
  );
}

function Detail({ label, value }) {
  return (
    <div>
      <p className="text-xs font-semibold uppercase tracking-wide text-slate-500">{label}</p>
      <p className="mt-1 text-sm font-semibold text-slate-900">{value}</p>
    </div>
  );
}

export default function BN03Nachrichtenvorschau() {
  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-03</p>
              <h1 className="mt-1 text-3xl font-bold">Nachrichtenvorschau</h1>
              <p className="mt-2 max-w-3xl text-sm text-slate-600">Konkrete Nachricht vor dem Versand prüfen – ohne Direktversand.</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">BN-02</button>
              <button className="rounded-xl border border-slate-300 bg-white px-4 py-2 text-sm font-semibold text-slate-800">FR-03</button>
              <button className="rounded-xl bg-sky-700 px-4 py-2 text-sm font-semibold text-white">BN-04</button>
            </div>
          </div>
        </header>

        <section className="rounded-2xl border border-slate-200 bg-white p-5 shadow-sm">
          <h2 className="text-lg font-bold">Vorschlagsstatus</h2>
          <div className="mt-4 flex flex-wrap gap-2">
            <Badge tone="green">ready</Badge>
            <Badge tone="blue">Quelle UC05</Badge>
            <Badge tone="red">overdue</Badge>
            <Badge tone="green">Datenschutz OK</Badge>
            <Badge tone="gray">NQ-2026-00047 · DT-1004</Badge>
          </div>
        </section>

        <div className="grid gap-5 lg:grid-cols-3">
          <Card title="Empfänger & Kanal">
            <div className="space-y-4">
              <Detail label="Empfänger" value="Maria Keller" />
              <Detail label="E-Mail" value="maria@example.test" />
              <Detail label="Kanal" value="E-Mail" />
              <Badge tone="blue">E-Mail</Badge>
            </div>
          </Card>

          <Card title="Vorlage & Platzhalter">
            <div className="space-y-2 text-sm text-slate-700">
              <p className="font-semibold">Vorlage: Frist überfällig</p>
              {placeholders.map((item) => <p key={item}>{item}</p>)}
            </div>
          </Card>

          <Card title="Prüfungen">
            <div className="flex flex-wrap gap-2">
              {checks.map((check) => <Badge key={check.label} tone={check.tone}>{check.label}</Badge>)}
            </div>
          </Card>
        </div>

        <Card title="Nachrichtenvorschau">
          <div className="space-y-4">
            <div>
              <p className="text-xs font-semibold uppercase tracking-wide text-slate-500">Betreff</p>
              <div className="mt-1 rounded-xl border border-slate-300 bg-slate-50 px-4 py-3 text-sm font-semibold text-slate-900">Ihre Prüffrist für DT-1004 ist überfällig</div>
            </div>
            <div>
              <p className="text-xs font-semibold uppercase tracking-wide text-slate-500">Nachricht</p>
              <div className="mt-1 rounded-xl border border-slate-300 bg-slate-50 p-4 text-sm leading-6 text-slate-700">
                <p>Guten Tag Maria Keller,</p>
                <p className="mt-2">die Prüffrist für Ihre Stahlflasche 12 l DT-1004 war am 2026-04-25 fällig.</p>
                <p className="mt-2">Bitte kontaktieren Sie die Tauchschule Hochrhein zur weiteren Abstimmung.</p>
              </div>
            </div>
          </div>
        </Card>

        <section className="rounded-2xl border border-slate-200 bg-white p-5 shadow-sm">
          <div className="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 zurück</button>
            <button className="rounded-xl border border-slate-300 px-4 py-2 text-sm font-semibold text-slate-700">BN-07 Vorlage</button>
            <button className="rounded-xl bg-sky-700 px-4 py-2 text-sm font-semibold text-white">BN-04 Versand</button>
          </div>
          <p className="mt-4 text-sm text-slate-500">BN-03 ist Vorschau. Versand erfolgt erst nach Bestätigung.</p>
        </section>
      </div>
    </div>
  );
}