import { OFFER_CATEGORIES } from "@/collections/Offers";
import type { Offer } from "@/payload-types";

export type ImageMood =
  | "plum"
  | "dustyrose"
  | "moss"
  | "caramel"
  | "mauve"
  | "sand"
  | "rose"
  | "peach";

// Purely a presentation fallback for offers/events without an uploaded photo
// yet — content itself always comes from the CMS.
const moodBySlug: Record<string, ImageMood> = {
  prozessbegleitung: "plum",
  "doula-begleitung": "dustyrose",
  erdenkinder: "moss",
  maedchenkreis: "caramel",
  "singen-im-kreis": "sand",
  "singen-fuer-schwangere": "peach",
  "mama-baby-singkreis": "rose",
};

const moodByCategory: Record<string, ImageMood> = {
  prozessbegleitung: "plum",
  "doula-begleitung": "dustyrose",
  kindergruppen: "moss",
  singkreise: "rose",
};

export function moodForOffer(offer: Pick<Offer, "slug" | "category">): ImageMood {
  return (offer.slug ? moodBySlug[offer.slug] : undefined) ?? moodByCategory[offer.category] ?? "mauve";
}

export type OfferCategoryGroup = {
  category: (typeof OFFER_CATEGORIES)[number]["value"];
  label: string;
  href: string;
  offers: Offer[];
};

const categoryHref: Record<string, string> = {
  prozessbegleitung: "/angebote/prozessbegleitung",
  "doula-begleitung": "/angebote/doula-begleitung",
  kindergruppen: "/angebote#kindergruppen",
  singkreise: "/angebote/singkreise",
};

/**
 * Groups the flat `offers` collection into the four nav/overview sections.
 * Private offers (e.g. "Einzelbegleitung") are deliberately excluded — they
 * stay reachable only via their own direct booking link.
 */
export function groupOffersByCategory(offers: Offer[]): OfferCategoryGroup[] {
  const publicOffers = offers.filter((offer) => offer.visibility !== "private");
  return OFFER_CATEGORIES.map(({ value, label }) => ({
    category: value,
    label,
    href: categoryHref[value] ?? "/angebote",
    offers: publicOffers
      .filter((offer) => offer.category === value)
      .sort((a, b) => (a.order ?? 0) - (b.order ?? 0)),
  })).filter((group) => group.offers.length > 0);
}