/**
 * TanStack Query hooks.
 *
 * The 30-second cadence is the CONSOLE's refetch interval, not a terminal push
 * rate: the tills push over MQTT as bills happen, and this is how often the
 * screen goes back and asks. It is applied per-query rather than globally so
 * that a provisioning form is not re-polling a tenant list it will never see
 * change mid-edit.
 */

import { useQueries, useQuery, type UseQueryOptions } from '@tanstack/react-query';
import { catalogueApi, type CatalogueQuery } from '@/api/catalogue';
import { insightsApi, type DateRange, type OrderQuery } from '@/api/insights';
import { productsApi } from '@/api/products';
import { posUsersApi, staffApi } from '@/api/people';
import { stockApi, type StockRequestQuery } from '@/api/stock';
import { tenantsApi } from '@/api/tenants';
import { queryKeys } from './keys';
import { LIVE_REFETCH_MS } from './interval';

/** How often live-operations screens go back to the backend. */
export { LIVE_REFETCH_MS };

/**
 * Shared options for anything that changes during a trading day.
 *
 * `refetchIntervalInBackground: false` pauses polling while the tab is hidden
 * and resumes with an immediate refetch when it comes back — a console left
 * open on a second monitor should not spend the afternoon talking to the API.
 * `staleTime` sits below the interval so focus and mount refetches aren't
 * skipped as already-fresh.
 */
const live = {
  refetchInterval: LIVE_REFETCH_MS,
  refetchIntervalInBackground: false,
  refetchOnWindowFocus: true,
  refetchOnReconnect: true,
  staleTime: 15_000,
} satisfies Partial<UseQueryOptions>;

/** Reference data that only changes when someone changes it. */
const stable = {
  staleTime: 5 * 60_000,
  refetchOnWindowFocus: false,
} satisfies Partial<UseQueryOptions>;

/* ── Tenants ─────────────────────────────────────────────────────────────── */

export function useTenants() {
  return useQuery({
    queryKey: queryKeys.tenants.list(),
    queryFn: () => tenantsApi.listAll(),
    ...stable,
  });
}

export function useTenantLocations(tenantid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.tenants.locations(tenantid ?? 0),
    queryFn: () => tenantsApi.locations(tenantid as number),
    // Never fire without the scoping id — the backend would 400, and a 400 in
    // the cache reads to the user as a broken page rather than a missing input.
    enabled: typeof tenantid === 'number' && tenantid > 0,
    ...stable,
  });
}

/* ── Global catalogue ────────────────────────────────────────────────────── */

export function useCatalogueProducts(query: CatalogueQuery) {
  return useQuery({
    queryKey: queryKeys.catalogue.products(query as Record<string, unknown>),
    queryFn: () => catalogueApi.products(query),
    ...stable,
  });
}

export function useCatalogueBrands() {
  return useQuery({
    queryKey: queryKeys.catalogue.brands(),
    queryFn: () => catalogueApi.brands(),
    ...stable,
  });
}

export function useImportedRefs(tenantid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.catalogue.importedRefs(tenantid ?? 0),
    queryFn: () => catalogueApi.importedRefs(tenantid as number),
    enabled: typeof tenantid === 'number' && tenantid > 0,
    ...stable,
  });
}

/* ── Products ────────────────────────────────────────────────────────────── */

export function useProductCategories(tenantid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.products.categories(tenantid ?? 0),
    queryFn: () => productsApi.categories(tenantid as number),
    enabled: typeof tenantid === 'number' && tenantid > 0,
    ...stable,
  });
}

export function useLocationProducts(
  tenantid: number | undefined,
  locationid: number | undefined,
  page = 0,
) {
  return useQuery({
    queryKey: queryKeys.products.byLocation(tenantid ?? 0, locationid ?? 0, page),
    queryFn: () =>
      productsApi.locationProducts({
        tenantid: tenantid as number,
        locationid: locationid as number,
        pageno: page,
      }),
    enabled: Boolean(tenantid) && Boolean(locationid),
    ...live,
  });
}

/* ── Performance ─────────────────────────────────────────────────────────── */

export function useLocationSummary(tenantid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.insights.locations(tenantid ?? 0),
    queryFn: () => insightsApi.locationSummary(tenantid as number),
    enabled: typeof tenantid === 'number' && tenantid > 0,
    ...live,
  });
}

export function useOrderSummary(tenantid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.insights.orders(tenantid ?? 0),
    queryFn: () => insightsApi.orderSummary(tenantid as number),
    enabled: typeof tenantid === 'number' && tenantid > 0,
    ...live,
  });
}

/**
 * Till health for one outlet.
 *
 * One request per branch — `locationid` is required and singular on the POS
 * endpoints, so there is no tenant-wide call to reach for.
 */
export function usePosHealth(locationid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.insights.posHealth(locationid ?? 0),
    queryFn: () => insightsApi.posHealth(locationid as number),
    enabled: typeof locationid === 'number' && locationid > 0,
    ...live,
  });
}

/* ── Store Admin: per-branch fan-out ─────────────────────────────────────── */

/**
 * Till health for several branches at once.
 *
 * `useQueries` rather than a loop of `useQuery`, because the number of branches
 * is data — a merchant can commission a fourth outlet while this screen is open,
 * and a hook count that changes between renders is a crash, not a re-render.
 *
 * One request per branch is not a choice: `/pos/health/location` takes a single
 * `location_id` and there is no tenant-wide POS endpoint anywhere in Fiesta.
 */
export function usePosHealthByBranch(locationIds: readonly number[]) {
  return useQueries({
    queries: locationIds.map((locationid) => ({
      queryKey: queryKeys.insights.posHealth(locationid),
      queryFn: () => insightsApi.posHealth(locationid),
      ...live,
    })),
  });
}

/** Counter-sales totals for several branches at once. Same fan-out, same reason. */
export function usePosSalesByBranch(locationIds: readonly number[], range: DateRange = {}) {
  return useQueries({
    queries: locationIds.map((locationid) => ({
      queryKey: queryKeys.insights.posSalesSummary(locationid, { ...range }),
      queryFn: () => insightsApi.posSalesSummary(locationid, range),
      ...live,
    })),
  });
}

/* ── Store Admin: stock ──────────────────────────────────────────────────── */

export function useStockRequests(query: StockRequestQuery | undefined) {
  return useQuery({
    queryKey: queryKeys.stock.requests((query ?? {}) as Record<string, unknown>),
    queryFn: () => stockApi.requests(query as StockRequestQuery),
    enabled: Boolean(query?.tenantid),
    ...live,
  });
}

export function useStockStatement(
  tenantid: number | undefined,
  locationid: number | undefined,
  params: { keyword?: string; pagesize?: number } = {},
) {
  return useQuery({
    queryKey: queryKeys.stock.statement(tenantid ?? 0, locationid ?? 0, params),
    queryFn: () =>
      stockApi.statement({
        tenantid: tenantid as number,
        locationid: locationid as number,
        ...params,
      }),
    enabled: Boolean(tenantid) && Boolean(locationid),
    ...live,
  });
}

/* ── Store Admin: order and bill rows ────────────────────────────────────── */

/**
 * The order rows.
 *
 * One call for every branch or for one, decided by whether `locationid` is
 * present — the backend routes on that, so there is nothing to fan out here.
 */
export function useOrders(query: OrderQuery | undefined) {
  return useQuery({
    queryKey: queryKeys.insights.orderList((query ?? {}) as unknown as Record<string, unknown>),
    queryFn: () => insightsApi.orders(query as OrderQuery),
    enabled: Boolean(query?.tenantid),
    ...live,
  });
}

/**
 * Counter bills, per branch.
 *
 * Fanned out because `/pos/sales` takes a single `locationid` and there is no
 * tenant-wide POS read — the same constraint as the health and summary calls.
 */
export function usePosBillsByBranch(
  locationIds: readonly number[],
  params: DateRange & { pagesize?: number } = {},
) {
  return useQueries({
    queries: locationIds.map((locationid) => ({
      queryKey: queryKeys.insights.posBills(locationid, { ...params }),
      queryFn: () => insightsApi.posSales(locationid, params),
      ...live,
    })),
  });
}

/** The delivery jobs — its own read, its own row shape, its own status ladder. */
export function useDeliveries(query: OrderQuery | undefined) {
  return useQuery({
    queryKey: queryKeys.insights.deliveryList((query ?? {}) as unknown as Record<string, unknown>),
    queryFn: () => insightsApi.deliveries(query as OrderQuery),
    enabled: Boolean(query?.tenantid),
    ...live,
  });
}

/* ── People ──────────────────────────────────────────────────────────────── */

/** The back-office directory. Role names arrive resolved; never map ids here. */
export function useStaff(tenantid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.people.staff(tenantid ?? 0),
    queryFn: () => staffApi.list(tenantid as number),
    enabled: Boolean(tenantid),
    ...stable,
  });
}

/**
 * Till accounts, per branch.
 *
 * Fanned out because `getposusers` takes a single `locationid` — the same
 * constraint as every other POS read.
 */
export function usePosUsersByBranch(tenantid: number | undefined, locationIds: readonly number[]) {
  return useQueries({
    queries: locationIds.map((locationid) => ({
      queryKey: queryKeys.people.posUsers(tenantid ?? 0, locationid),
      queryFn: () => posUsersApi.list(tenantid as number, locationid),
      enabled: Boolean(tenantid),
      ...stable,
    })),
  });
}

/** The role picker's source. Cached hard — it changes when the product changes. */
export function usePosRoles() {
  return useQuery({
    queryKey: queryKeys.people.posRoles(),
    queryFn: () => posUsersApi.roles(),
    ...stable,
  });
}

export function useStaffShifts(tenantid: number | undefined, locationid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.people.shifts(tenantid ?? 0, locationid ?? 0),
    queryFn: () => posUsersApi.shifts(tenantid as number, locationid as number),
    enabled: Boolean(tenantid) && Boolean(locationid),
    ...stable,
  });
}