import { BUSINESS_ORIGIN, CUSTOMER_ORIGIN } from "./site";

export const GUEST_CART_URL_PARAM = "guestCart";

export type GuestCartLine = {
  id: string;
  name: string;
  slug?: string;
  price: number;
  quantity: number;
  image?: string | null;
};

export function encodeGuestCartForUrl(items: GuestCartLine[]): string {
  const payload = items.map(({ id, name, slug, price, quantity, image }) => ({
    id,
    name,
    ...(slug ? { slug } : {}),
    price,
    quantity,
    image: image ?? null,
  }));
  const json = JSON.stringify(payload);
  return btoa(unescape(encodeURIComponent(json)))
    .replace(/\+/g, "-")
    .replace(/\//g, "_")
    .replace(/=+$/, "");
}

export function customerDashboardUrl(path = "/"): string {
  const normalized = path.startsWith("/") ? path : `/${path}`;
  return `${CUSTOMER_ORIGIN}${normalized}`;
}

export function businessDashboardUrl(): string {
  return `${BUSINESS_ORIGIN}/`;
}

export function customerLoginUrl(redirectPath = "/", cartItems?: GuestCartLine[]): string {
  let redirect = redirectPath.startsWith("/") ? redirectPath : `/${redirectPath}`;
  if (cartItems && cartItems.length > 0) {
    const join = redirect.includes("#") ? "&" : "#";
    redirect = `${redirect}${join}${GUEST_CART_URL_PARAM}=${encodeGuestCartForUrl(cartItems)}`;
  }
  const url = new URL("/login", CUSTOMER_ORIGIN);
  url.searchParams.set("redirect", redirect);
  return url.toString();
}

export function customerContinueCheckoutUrl(isAuthenticated: boolean, cartItems: GuestCartLine[] = []): string {
  if (isAuthenticated) {
    const url = new URL("/checkout/cart", CUSTOMER_ORIGIN);
    if (cartItems.length > 0) {
      url.hash = `${GUEST_CART_URL_PARAM}=${encodeGuestCartForUrl(cartItems)}`;
    }
    return url.toString();
  }
  return customerLoginUrl("/checkout/cart", cartItems);
}