import { createApi } from "@vmall/shared";
import type { ApiClient } from "@vmall/shared";
import { createMockApi } from "~/mock/api";

/**
 * Domains the live backend serves. Every other domain stays on the fixed-data
 * adapter, so a domain can be migrated - or rolled back - by editing this list
 * alone. See openspec/changes/replace-mock-api-wave-1/design.md.
 */
type LiveDomain =
  | "auth"
  | "account"
  | "catalog"
  | "currency"
  | "content"
  | "shops"
  | "brands"
  | "cart"
  | "orders"
  | "shipments"
  | "invoices"
  | "addresses"
  | "coupons"
  | "points"
  | "flashSales"
  | "groupBuying";

/**
 * Explicit per-domain method picks rather than a string allowlist: indexing
 * `ApiClient` by a union of method names would need an unsafe cast, and this
 * keeps the compiler checking that every picked key exists.
 */
const LIVE_PICKS = {
  auth: (a: ApiClient) => ({ register: a.register, login: a.login, me: a.me }),
  account: (a: ApiClient) => ({ getAccountSummary: a.getAccountSummary }),
  catalog: (a: ApiClient) => ({
    listProducts: a.listProducts,
    getProduct: a.getProduct,
    listCategories: a.listCategories,
  }),
  currency: (a: ApiClient) => ({ listCurrencies: a.listCurrencies, convert: a.convert }),
  content: (a: ApiClient) => ({ getHomeContent: a.getHomeContent }),
  shops: (a: ApiClient) => ({ listShops: a.listShops, getShop: a.getShop }),
  brands: (a: ApiClient) => ({ listBrands: a.listBrands }),
  cart: (a: ApiClient) => ({
    getCart: a.getCart,
    addCartItem: a.addCartItem,
    updateCartItem: a.updateCartItem,
    removeCartItem: a.removeCartItem,
  }),
  orders: (a: ApiClient) => ({
    checkout: a.checkout,
    listMyOrders: a.listMyOrders,
    getOrder: a.getOrder,
    cancelOrder: a.cancelOrder,
    payOrder: a.payOrder,
  }),
  shipments: (a: ApiClient) => ({
    confirmDelivered: a.confirmDelivered,
    listMyShipments: a.listMyShipments,
  }),
  invoices: (a: ApiClient) => ({
    requestInvoice: a.requestInvoice,
    listMyInvoices: a.listMyInvoices,
  }),
  addresses: (a: ApiClient) => ({
    listMyAddresses: a.listMyAddresses,
    createAddress: a.createAddress,
    updateAddress: a.updateAddress,
    deleteAddress: a.deleteAddress,
    setDefaultAddress: a.setDefaultAddress,
  }),
  coupons: (a: ApiClient) => ({
    listShopCouponTemplates: a.listShopCouponTemplates,
    listMyCoupons: a.listMyCoupons,
    claimCoupon: a.claimCoupon,
  }),
  points: (a: ApiClient) => ({
    listPointsProducts: a.listPointsProducts,
    listMyRedemptions: a.listMyRedemptions,
    redeemPoints: a.redeemPoints,
  }),
  flashSales: (a: ApiClient) => ({ listFlashSales: a.listFlashSales }),
  groupBuying: (a: ApiClient) => ({
    listGroupBuyingActivities: a.listGroupBuyingActivities,
  }),
} satisfies Record<LiveDomain, (a: ApiClient) => Partial<ApiClient>>;

const KNOWN_DOMAINS = Object.keys(LIVE_PICKS) as LiveDomain[];

/** Fallback when runtimeConfig supplies no list; keep in step with nuxt.config.ts. */
const DEFAULT_LIVE_DOMAINS: LiveDomain[] = [
  "catalog",
  "currency",
  "content",
  "shops",
  "brands",
  "auth",
  "account",
  "cart",
  "orders",
  "shipments",
  "invoices",
  "addresses",
  "coupons",
  "points",
  "flashSales",
  "groupBuying",
];

export default defineNuxtPlugin(() => {
  const config = useRuntimeConfig();
  const mock = createMockApi();
  const live = createApi({
    baseUrl: config.public.apiBase as string,
    getToken: () => (import.meta.client ? localStorage.getItem("vmall.token") : null),
  });

  const configured = config.public.liveDomains as string[] | undefined;
  const liveDomains = (configured ?? DEFAULT_LIVE_DOMAINS).filter((domain): domain is LiveDomain =>
    KNOWN_DOMAINS.includes(domain as LiveDomain),
  );

  // The fixed-data adapter is the base object, so an unmigrated domain cannot
  // regress and a live domain can be rolled back by removing one entry.
  let api: ApiClient = mock;
  for (const domain of liveDomains) {
    api = { ...api, ...LIVE_PICKS[domain](live) };
  }

  return { provide: { api } };
});