import type { Prisma } from "@prisma/client";
import { prisma } from "@/lib/prisma";

export type LandingContentV1 = {
  version: 1;
  heroTitle: string;
  heroLead: string;
  primaryCta: { label: string; href: string };
  secondaryCta?: { label: string; href: string };
  benefitSectionTitle: string;
  benefits: { title: string; body: string }[];
};

export const defaultLandingContent = (): LandingContentV1 => ({
  version: 1,
  heroTitle: "Motorrad fahren von A–Z",
  heroLead:
    "Von der Fahrschule zur ersten Serpentine. Tipps, Übungen und Kurse – strukturiert auf einer Plattform.",
  primaryCta: { label: "Zu den Kursen", href: "/kurse" },
  secondaryCta: { label: "Mitgliederbereich", href: "/portal" },
  benefitSectionTitle: "Deine Vorteile",
  benefits: [
    {
      title: "Praxisorientiert",
      body: "Inhalte, die du auf den Platz und in den Alltag übernehmen kannst – Schritt für Schritt.",
    },
    {
      title: "Von A bis Z",
      body: "Klare Module statt Wildwuchs: vom ersten Gedanken ans Motorradfahren bis zu gezielten Übungen.",
    },
    {
      title: "Fortschritt & Zertifikat",
      body: "Behalte deinen Lernstand im Blick und sichere dir nach Abschluss eine Teilnahmebestätigung.",
    },
  ],
});

function isRecord(v: unknown): v is Record<string, unknown> {
  return typeof v === "object" && v !== null;
}

export function parseLandingContent(raw: unknown): LandingContentV1 {
  if (!isRecord(raw) || raw.version !== 1) return defaultLandingContent();
  const heroTitle = typeof raw.heroTitle === "string" ? raw.heroTitle : "";
  const heroLead = typeof raw.heroLead === "string" ? raw.heroLead : "";
  const benefitSectionTitle =
    typeof raw.benefitSectionTitle === "string" ? raw.benefitSectionTitle : "Deine Vorteile";
  const primaryCta = isRecord(raw.primaryCta)
    ? {
        label: typeof raw.primaryCta.label === "string" ? raw.primaryCta.label : "Mehr",
        href: typeof raw.primaryCta.href === "string" ? raw.primaryCta.href : "/kurse",
      }
    : { label: "Zu den Kursen", href: "/kurse" };
  let secondaryCta: LandingContentV1["secondaryCta"];
  if (isRecord(raw.secondaryCta)) {
    const l = typeof raw.secondaryCta.label === "string" ? raw.secondaryCta.label : "";
    const h = typeof raw.secondaryCta.href === "string" ? raw.secondaryCta.href : "";
    if (l && h) secondaryCta = { label: l, href: h };
  }
  const benefitsRaw = Array.isArray(raw.benefits) ? raw.benefits : [];
  const benefits = benefitsRaw
    .map((b) => {
      if (!isRecord(b)) return null;
      const title = typeof b.title === "string" ? b.title : "";
      const body = typeof b.body === "string" ? b.body : "";
      if (!title && !body) return null;
      return { title, body };
    })
    .filter(Boolean) as { title: string; body: string }[];

  return {
    version: 1,
    heroTitle: heroTitle || defaultLandingContent().heroTitle,
    heroLead: heroLead || defaultLandingContent().heroLead,
    primaryCta,
    secondaryCta,
    benefitSectionTitle,
    benefits: benefits.length ? benefits : defaultLandingContent().benefits,
  };
}

export async function getLandingContent(): Promise<LandingContentV1> {
  const row = await prisma.landingPage.findUnique({ where: { id: "default" } });
  if (!row) return defaultLandingContent();
  return parseLandingContent(row.content);
}

export async function saveLandingContent(content: LandingContentV1) {
  const json = content as unknown as Prisma.InputJsonValue;
  await prisma.landingPage.upsert({
    where: { id: "default" },
    create: { id: "default", content: json },
    update: { content: json },
  });
}