const PAYLOAD_URL = process.env.PAYLOAD_URL || "https://payload.mk360.de";
const TENANT_SLUG = "einfach-produktiv";

export type BlogPost = {
  id: number;
  title: string;
  slug: string;
  category: string;
  readTime: number;
  excerpt: string;
  thumbnail: string | null;
  publishedAt: string;
  featured: boolean;
};

type PayloadPost = {
  id: number;
  title: string;
  slug: string;
  category: { name: string } | number | null;
  readTime: number;
  excerpt: string;
  thumbnail: { url: string } | number | null;
  publishedAt: string;
  featured: boolean;
};

// sort: "-featured,-publishedAt" — Payload's multi-field sort puts any
// featured post(s) first, most-recently-published first among those, then
// the rest by date. Callers that just want posts[0] as "the" featured post
// (e.g. /blog) get a deterministic pick even if more than one post was
// accidentally marked featured — no special-casing needed here.
export async function getBlogPosts(limit = 3): Promise<BlogPost[]> {
  const params = new URLSearchParams({
    "where[tenant.slug][equals]": TENANT_SLUG,
    sort: "-featured,-publishedAt",
    depth: "2",
    limit: String(limit),
  });

  const res = await fetch(`${PAYLOAD_URL}/api/posts?${params}`, {
    next: { revalidate: 60 },
  });
  if (!res.ok) {
    console.error(`getBlogPosts: Payload returned ${res.status} ${res.statusText}`);
    return [];
  }

  const data: { docs?: PayloadPost[] } = await res.json();
  const docs = Array.isArray(data.docs) ? data.docs : [];
  return docs.map((post) => ({
    id: post.id,
    title: post.title,
    slug: post.slug,
    category:
      typeof post.category === "object" && post.category
        ? post.category.name
        : "",
    readTime: post.readTime,
    excerpt: post.excerpt,
    thumbnail:
      typeof post.thumbnail === "object" && post.thumbnail
        ? post.thumbnail.url
        : null,
    publishedAt: post.publishedAt,
    featured: post.featured,
  }));
}

export type PostDetail = BlogPost & {
  content: unknown;
};

type PayloadPostDetail = PayloadPost & { content: unknown };

export async function getPostBySlug(slug: string): Promise<PostDetail | null> {
  const params = new URLSearchParams({
    "where[tenant.slug][equals]": TENANT_SLUG,
    "where[slug][equals]": slug,
    depth: "2",
    limit: "1",
  });

  const res = await fetch(`${PAYLOAD_URL}/api/posts?${params}`, {
    next: { revalidate: 60 },
  });
  if (!res.ok) {
    console.error(`getPostBySlug: Payload returned ${res.status} ${res.statusText}`);
    return null;
  }

  const data: { docs?: PayloadPostDetail[] } = await res.json();
  const doc = data.docs?.[0];
  if (!doc) return null;
  return {
    id: doc.id,
    title: doc.title,
    slug: doc.slug,
    category:
      typeof doc.category === "object" && doc.category ? doc.category.name : "",
    readTime: doc.readTime,
    excerpt: doc.excerpt,
    thumbnail:
      typeof doc.thumbnail === "object" && doc.thumbnail ? doc.thumbnail.url : null,
    content: doc.content,
    publishedAt: doc.publishedAt,
    featured: doc.featured,
  };
}

// Frontend-facing shape — `id` is Payload's `slug` field, not its numeric
// row id. Cart items are stored in localStorage keyed by this string (see
// lib/cart.ts), so slugs were chosen in the Products collection to match
// the ids the old hardcoded catalog used ("todo-karten" etc.) — switching
// to numeric ids here would silently orphan every existing shopper's cart.
export type Product = {
  id: string;
  name: string;
  description: string;
  price: number;
  compareAtPrice: number | null;
  image: string;
  href: string | null;
};

type PayloadProduct = {
  id: number;
  name: string;
  slug: string;
  description: string | null;
  price: number;
  compareAtPrice: number | null;
  image: { url: string } | number | null;
  detailHref: string | null;
};

export async function getProducts(): Promise<Product[]> {
  const params = new URLSearchParams({
    "where[tenant.slug][equals]": TENANT_SLUG,
    sort: "sortOrder",
    depth: "2",
    limit: "100",
  });

  const res = await fetch(`${PAYLOAD_URL}/api/products?${params}`, {
    next: { revalidate: 60 },
  });
  if (!res.ok) {
    console.error(`getProducts: Payload returned ${res.status} ${res.statusText}`);
    return [];
  }

  const data: { docs?: PayloadProduct[] } = await res.json();
  const docs = Array.isArray(data.docs) ? data.docs : [];
  return docs.map((product) => ({
    id: product.slug,
    name: product.name,
    description: product.description ?? "",
    price: product.price,
    compareAtPrice: product.compareAtPrice ?? null,
    image: typeof product.image === "object" && product.image ? product.image.url : "",
    href: product.detailHref || null,
  }));
}

export async function getProductBySlug(slug: string): Promise<Product | null> {
  const products = await getProducts();
  return products.find((p) => p.id === slug) ?? null;
}

export type SpotlightProduct = Product & {
  spotlightHeadline: string | null;
  spotlightText: string | null;
  spotlightImage: string | null;
};

type PayloadSpotlightProduct = PayloadProduct & {
  spotlightHeadline: string | null;
  spotlightText: string | null;
  spotlightImage: { url: string } | number | null;
};

// sort: "-spotlight,-updatedAt" — same deterministic-tie-breaker pattern
// as getBlogPosts' featured post: if more than one product is accidentally
// marked spotlight, the most recently updated one wins, no error.
export async function getSpotlightProduct(): Promise<SpotlightProduct | null> {
  const params = new URLSearchParams({
    "where[tenant.slug][equals]": TENANT_SLUG,
    "where[spotlight][equals]": "true",
    sort: "-updatedAt",
    depth: "2",
    limit: "1",
  });

  const res = await fetch(`${PAYLOAD_URL}/api/products?${params}`, {
    next: { revalidate: 60 },
  });
  if (!res.ok) {
    console.error(`getSpotlightProduct: Payload returned ${res.status} ${res.statusText}`);
    return null;
  }

  const data: { docs?: PayloadSpotlightProduct[] } = await res.json();
  const doc = data.docs?.[0];
  if (!doc) return null;
  return {
    id: doc.slug,
    name: doc.name,
    description: doc.description ?? "",
    price: doc.price,
    compareAtPrice: doc.compareAtPrice ?? null,
    image: typeof doc.image === "object" && doc.image ? doc.image.url : "",
    href: doc.detailHref || null,
    spotlightHeadline: doc.spotlightHeadline || null,
    spotlightText: doc.spotlightText || null,
    spotlightImage:
      typeof doc.spotlightImage === "object" && doc.spotlightImage ? doc.spotlightImage.url : null,
  };
}

export type TrustBadge = { id: number; title: string; description: string; icon: string };

type PayloadTrustBadge = { id: number; title: string; description: string; icon: { url: string } | number | null };

async function fetchTrustBadgeList(collection: "trust-badges" | "cart-trust-badges"): Promise<TrustBadge[]> {
  const params = new URLSearchParams({
    "where[tenant.slug][equals]": TENANT_SLUG,
    sort: "sortOrder",
    depth: "1",
    limit: "50",
  });

  const res = await fetch(`${PAYLOAD_URL}/api/${collection}?${params}`, {
    next: { revalidate: 60 },
  });
  if (!res.ok) {
    console.error(`fetchTrustBadgeList(${collection}): Payload returned ${res.status} ${res.statusText}`);
    return [];
  }

  const data: { docs?: PayloadTrustBadge[] } = await res.json();
  const docs = Array.isArray(data.docs) ? data.docs : [];
  return docs.map((doc) => ({
    id: doc.id,
    title: doc.title,
    description: doc.description,
    icon: typeof doc.icon === "object" && doc.icon ? doc.icon.url : "",
  }));
}

// Powers TrustRow.tsx — the horizontal "Schneller Versand /
// Versandkostenfrei / Mit Liebe verpackt" row.
export async function getTrustBadges(): Promise<TrustBadge[]> {
  return fetchTrustBadgeList("trust-badges");
}

// Powers the "Sichere Zahlung / 14 Tage Rückgaberecht / Nachhaltig
// verpackt" sidebar bullets on /cart (title only) and /checkout
// (title + description) — a different list from TrustBadges.
export async function getCartTrustBadges(): Promise<TrustBadge[]> {
  return fetchTrustBadgeList("cart-trust-badges");
}

export type ShippingMethod = {
  id: number;
  title: string;
  description: string;
  price: number;
  freeShippingThreshold: number | null;
};

type PayloadShippingMethod = ShippingMethod & { active: boolean };

export async function getShippingMethods(): Promise<ShippingMethod[]> {
  const params = new URLSearchParams({
    "where[tenant.slug][equals]": TENANT_SLUG,
    "where[active][equals]": "true",
    sort: "sortOrder",
    limit: "20",
  });

  const res = await fetch(`${PAYLOAD_URL}/api/shipping-methods?${params}`, {
    next: { revalidate: 60 },
  });
  if (!res.ok) {
    console.error(`getShippingMethods: Payload returned ${res.status} ${res.statusText}`);
    return [];
  }

  const data: { docs?: PayloadShippingMethod[] } = await res.json();
  const docs = Array.isArray(data.docs) ? data.docs : [];
  return docs.map((doc) => ({
    id: doc.id,
    title: doc.title,
    description: doc.description,
    price: doc.price,
    freeShippingThreshold: doc.freeShippingThreshold ?? null,
  }));
}

export type PaymentMethod = { id: number; title: string; icons: string[] };

type PayloadPaymentMethod = {
  id: number;
  title: string;
  active: boolean;
  icons: { icon: { url: string } | number | null }[];
};

export async function getPaymentMethods(): Promise<PaymentMethod[]> {
  const params = new URLSearchParams({
    "where[tenant.slug][equals]": TENANT_SLUG,
    "where[active][equals]": "true",
    sort: "sortOrder",
    depth: "1",
    limit: "20",
  });

  const res = await fetch(`${PAYLOAD_URL}/api/payment-methods?${params}`, {
    next: { revalidate: 60 },
  });
  if (!res.ok) {
    console.error(`getPaymentMethods: Payload returned ${res.status} ${res.statusText}`);
    return [];
  }

  const data: { docs?: PayloadPaymentMethod[] } = await res.json();
  const docs = Array.isArray(data.docs) ? data.docs : [];
  return docs.map((doc) => ({
    id: doc.id,
    title: doc.title,
    icons: (doc.icons ?? [])
      .map((row) => (typeof row.icon === "object" && row.icon ? row.icon.url : null))
      .filter((url): url is string => Boolean(url)),
  }));
}

export type WerkzeugeCard = {
  id: number;
  title: string;
  description: string;
  icon: string;
  ctaLabel: string;
  ctaHref: string;
};

type PayloadWerkzeugeCard = {
  id: number;
  title: string;
  description: string;
  icon: { url: string } | number | null;
  ctaLabel: string;
  ctaHref: string;
};

export async function getWerkzeugeCards(): Promise<WerkzeugeCard[]> {
  const params = new URLSearchParams({
    "where[tenant.slug][equals]": TENANT_SLUG,
    sort: "sortOrder",
    depth: "1",
    limit: "20",
  });

  const res = await fetch(`${PAYLOAD_URL}/api/werkzeuge-cards?${params}`, {
    next: { revalidate: 60 },
  });
  if (!res.ok) {
    console.error(`getWerkzeugeCards: Payload returned ${res.status} ${res.statusText}`);
    return [];
  }

  const data: { docs?: PayloadWerkzeugeCard[] } = await res.json();
  const docs = Array.isArray(data.docs) ? data.docs : [];
  return docs.map((doc) => ({
    id: doc.id,
    title: doc.title,
    description: doc.description,
    icon: typeof doc.icon === "object" && doc.icon ? doc.icon.url : "",
    ctaLabel: doc.ctaLabel,
    ctaHref: doc.ctaHref,
  }));
}

export type LegalPageType = "impressum" | "datenschutz" | "agb" | "widerruf";

export type LegalPage = {
  type: LegalPageType;
  title: string;
  content: unknown;
  attachment: { url: string; title: string } | null;
};

type PayloadLegalPage = {
  type: LegalPageType;
  title: string;
  content: unknown;
  attachment: { url: string; title: string } | number | null;
};

export async function getLegalPage(type: LegalPageType): Promise<LegalPage | null> {
  const params = new URLSearchParams({
    "where[tenant.slug][equals]": TENANT_SLUG,
    "where[type][equals]": type,
    depth: "1",
    limit: "1",
  });

  const res = await fetch(`${PAYLOAD_URL}/api/legal-pages?${params}`, {
    next: { revalidate: 60 },
  });
  if (!res.ok) {
    console.error(`getLegalPage: Payload returned ${res.status} ${res.statusText}`);
    return null;
  }

  const data: { docs?: PayloadLegalPage[] } = await res.json();
  const doc = data.docs?.[0];
  if (!doc) return null;
  return {
    type: doc.type,
    title: doc.title,
    content: doc.content,
    attachment:
      typeof doc.attachment === "object" && doc.attachment
        ? { url: doc.attachment.url, title: doc.attachment.title }
        : null,
  };
}