"use client";

import {
  CONSENT_COOKIE,
  CONSENT_EVENT,
  CONSENT_MAX_AGE_S,
  CONSENT_OPEN_EVENT,
  readConsentCookie,
  serializeConsent,
  type Consent,
} from "@/lib/consent";

/** Magasin minimal basé sur document.cookie + événements, pour useSyncExternalStore. */
export function subscribe(cb: () => void) {
  window.addEventListener(CONSENT_EVENT, cb);
  return () => window.removeEventListener(CONSENT_EVENT, cb);
}

let lastRaw: string | null = null;
let lastParsed: Consent | null | undefined;

/** Retourne un snapshot stable : `undefined` = pas de choix enregistré. */
export function getSnapshot(): Consent | undefined {
  const raw = document.cookie;
  if (raw !== lastRaw || lastParsed === undefined) {
    lastRaw = raw;
    lastParsed = readConsentCookie(raw);
  }
  return lastParsed ?? undefined;
}

export function getServerSnapshot(): Consent | undefined | null {
  return null; // null = inconnu côté serveur (rien n'est rendu)
}

export function writeConsent(c: Consent) {
  const secure = window.location.protocol === "https:" ? "; Secure" : "";
  document.cookie = `${CONSENT_COOKIE}=${serializeConsent(c)}; Max-Age=${CONSENT_MAX_AGE_S}; Path=/; SameSite=Lax${secure}`;
  window.dispatchEvent(new Event(CONSENT_EVENT));
}

export function openPreferences() {
  window.dispatchEvent(new Event(CONSENT_OPEN_EVENT));
}