/**
 * Daten fuer die oeffentliche Onepage. Liefert ausschliesslich, was
 * oeffentlich sein darf: keine Kapazitaet, keine Restplaetze, kein
 * Kontingent, keine Gutscheine, keine internen Kalkulationswerte.
 */
import { getCamp, publicCampFacts, salesStateFor, type PublicCampFacts } from "./camp";
import { getDb } from "./db";
import { env, showDevPlaceholders, stripeModeOrNull } from "./env";
import { BASE_PRICE_CENTS, calculatePrice, EARLY_BIRD_START, REGULAR_START, type PricePhase } from "./pricing";
import type { SalesState, StripeMode } from "./sales-gate";

export type PublicPricing = {
  mode: StripeMode | null;
  checkoutOpen: boolean;
  closedReason: SalesState["closedReason"] | "NOT_CONFIGURED";
  phase: PricePhase;
  phaseSimulated: boolean;
  regularCents: number;
  earlyBirdCents: number;
  /** Aktuell gueltiger Preis ohne Gutschein; null in der Vorschau. */
  currentCents: number | null;
  earlyBirdStartIso: string;
  earlyBirdEndIso: string;
  installmentsAllowed: boolean;
  reservationMinutes: number;
};

export type PublicPageData = {
  facts: PublicCampFacts;
  pricing: PublicPricing;
  showDrafts: boolean;
  externalVideoProvider: "none" | "youtube-nocookie" | "vimeo";
};

export async function loadPublicPage(now: Date = new Date()): Promise<PublicPageData> {
  const camp = await getCamp(getDb());
  const mode = stripeModeOrNull();
  const facts = publicCampFacts(camp);

  let pricing: PublicPricing;
  const base = {
    regularCents: BASE_PRICE_CENTS,
    earlyBirdCents: calculatePrice("EARLY_BIRD", false).totalCents,
    earlyBirdStartIso: EARLY_BIRD_START.toISOString(),
    earlyBirdEndIso: REGULAR_START.toISOString(),
    reservationMinutes: camp.reservationMinutes,
  };
  if (!mode) {
    pricing = {
      ...base,
      mode: null,
      checkoutOpen: false,
      closedReason: "NOT_CONFIGURED",
      phase: "PREVIEW",
      phaseSimulated: false,
      currentCents: null,
      installmentsAllowed: false,
    };
  } else {
    const state = salesStateFor(camp, mode, now);
    pricing = {
      ...base,
      mode,
      checkoutOpen: state.checkoutOpen,
      closedReason: state.closedReason,
      phase: state.effectivePhase,
      phaseSimulated: state.phaseSimulated,
      currentCents: state.effectivePhase === "PREVIEW" ? null : calculatePrice(state.effectivePhase, false).totalCents,
      installmentsAllowed: state.installmentsAllowed,
    };
  }
  return { facts, pricing, showDrafts: showDevPlaceholders(), externalVideoProvider: env().EXTERNAL_VIDEO_PROVIDER };
}