/**
 * 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 { deliveriesApi, ridersApi } from '@/api/deliveries';
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, utilsApi, type TenantListQuery } from '@/api/tenants';
import { partnersApi } from '@/api/deliveries';
import { customersApi, type CustomerQuery } from '@/api/customers';
import { telemetryApi, type RiderSnapshot } from '@/api/telemetry';
import { uploadsApi } from '@/api/uploads';
import { APP_BROWSE_CATEGORY } from '@/features/catalogue/tenantCategories';
import { dedupePartners } from '@/features/nearle-admin/partnerList';
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(query: TenantListQuery = {}) {
  return useQuery({
    queryKey: queryKeys.tenants.list({ ...query }),
    queryFn: () => tenantsApi.listAll(query),
    ...stable,
  });
}

/**
 * The approval queue.
 *
 * Its own hook rather than a filter over `useTenants`, because it is a
 * different endpoint: `getalltenants` cannot see an unapproved tenant at all.
 */
export function useTenantsByApproval(status: 'pending' | 'Active' | 'InActive', keyword?: string) {
  return useQuery({
    queryKey: queryKeys.tenants.approval(status, keyword ?? ''),
    queryFn: () => tenantsApi.byApproval(status, keyword),
    ...stable,
  });
}

/** The business-category master, for onboarding. */
export function useAppCategories() {
  return useQuery({
    queryKey: queryKeys.tenants.appCategories(),
    queryFn: () => utilsApi.appCategories(),
    ...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,
  });
}

/**
 * The categories inside one brand's table.
 *
 * Brand-scoped because the backend reads them from that brand's own table
 * (`catalogueController.go:38-45` refuses without one) — there is no
 * catalogue-wide category list to ask for. That is why the rail nests
 * categories under a brand rather than listing them at the top level.
 */
export function useCatalogueCategories(brand: string | undefined) {
  return useQuery({
    queryKey: queryKeys.catalogue.categories(brand ?? ''),
    queryFn: () => catalogueApi.categories(brand as string),
    enabled: Boolean(brand),
    ...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 ────────────────────────────────────────────────────────────── */

/**
 * Every delivery partner across every region.
 *
 * `getpartners` takes one region at a time and refuses 0, so the whole list is
 * the regions fanned out and joined up. Three regions today — Coimbatore,
 * Madurai, Nagercoil — so this is three requests, not a page of them.
 *
 * Joined up, not concatenated: the backend scopes on `partnerlocations`, so a
 * partner covering two cities is returned by both of those requests and is
 * still one partner. See `dedupePartners`.
 */
export function useAllPartners() {
  const regions = useAppRegions();
  const ids = (regions.data ?? []).map((region) => region.applocationid);

  const results = useQueries({
    queries: ids.map((applocationid) => ({
      queryKey: queryKeys.partners.inRegion(applocationid),
      queryFn: () => partnersApi.list(applocationid),
      ...stable,
    })),
  });

  // Deduped, because the per-region answers legitimately overlap now that the
  // backend scopes on `partnerlocations` — see `dedupePartners`.
  return {
    data: dedupePartners(results.map((result) => result.data)),
    isLoading: regions.isLoading || results.some((result) => result.isLoading),
  };
}

/** The delivery regions. `0` asks for all of them — see `utilsApi.appLocations`. */
export function useAppRegions() {
  return useQuery({
    queryKey: queryKeys.regions.all,
    queryFn: () => utilsApi.appLocations(0),
    ...stable,
  });
}

/**
 * One delivery partner's riders.
 *
 * The roster, not `getriders`: the second wants a clock-in stamped today, so a
 * rider added five minutes ago is absent from it — which reads as a failed
 * save. The directory shows everybody and reports duty as a state.
 */
export function usePartnerRiders(partnerid: number | undefined) {
  return useQuery({
    queryKey: [...queryKeys.partners.all, 'riders', partnerid ?? 0] as const,
    queryFn: () => ridersApi.partnerRoster(partnerid as number),
    enabled: typeof partnerid === 'number' && partnerid > 0,
    ...stable,
  });
}

/**
 * How many riders each partner has, keyed by partnerid.
 *
 * Fanned out because `getriderroster` takes one partner at a time. Five
 * partners today, so five requests — and the count is what makes the Riders
 * button worth pressing, since "Riders" alone asks you to open a drawer to find
 * out whether there are any.
 */
export function usePartnerRiderCounts(partnerids: readonly number[]) {
  const ids = [...new Set(partnerids)].filter((id) => id > 0);

  const results = useQueries({
    queries: ids.map((partnerid) => ({
      queryKey: [...queryKeys.partners.all, 'riders', partnerid] as const,
      queryFn: () => ridersApi.partnerRoster(partnerid),
      ...stable,
    })),
  });

  const counts = new Map<number, number>();
  results.forEach((result, index) => {
    const id = ids[index];
    if (id !== undefined && result.data) counts.set(id, result.data.length);
  });
  return counts;
}

/**
 * Every GPS ping a partner's riders sent over a window.
 *
 * ── Why the window is small by default ────────────────────────────────────
 *
 * The response is one row per ping and the riders ping constantly: August 2026
 * returned 320,132 rows for eight riders. A month is several megabytes of JSON
 * to fetch, parse and smooth, so the fleet view asks for a day or two and says
 * which day it is showing.
 *
 * Cached longer than `stable` allows because it is history: yesterday's pings
 * do not change, and a refetch on every focus would re-download the day.
 */
export function usePartnerRiderLogs(
  partnerid: number | undefined,
  range: { fromdate: string; todate: string },
) {
  return useQuery({
    queryKey: queryKeys.partners.logs(partnerid ?? 0, range.fromdate, range.todate),
    queryFn: () =>
      partnersApi.riderLogs({
        partnerid: partnerid as number,
        fromdate: range.fromdate,
        todate: range.todate,
      }),
    enabled:
      typeof partnerid === 'number' && partnerid > 0 && Boolean(range.fromdate && range.todate),
    ...stable,
    staleTime: 5 * 60_000,
  });
}

/** The regions one partner covers. */
export function usePartnerLocations(partnerid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.partners.locations(partnerid ?? 0),
    queryFn: () => partnersApi.locations(partnerid as number),
    enabled: typeof partnerid === 'number' && partnerid > 0,
    ...stable,
  });
}

/**
 * The ten aisles the customer app groups products into.
 *
 * `productsubcategories` for category 2 — platform rows, the same ten for
 * every tenant, so the tenantid only satisfies the endpoint's signature. This
 * is the list `getproductsbysubcategory` buckets against, which makes it the
 * one the console has to name products from too; see `appAisle.ts`.
 */
export function useAppAisles(tenantid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.products.subCategories(tenantid ?? 0, APP_BROWSE_CATEGORY),
    queryFn: () => productsApi.subCategories(tenantid as number, APP_BROWSE_CATEGORY),
    enabled: typeof tenantid === 'number' && tenantid > 0,
    ...stable,
  });
}

/**
 * One global-catalogue row, for the product drawer.
 *
 * Not retried: the common failure is that a re-scrape retired the source row,
 * and asking three more times does not bring it back.
 */
export function useCatalogueProduct(brand: string | undefined, sku: string | undefined) {
  return useQuery({
    queryKey: queryKeys.catalogue.product(brand ?? '', sku ?? ''),
    queryFn: () => catalogueApi.product(brand as string, sku as string),
    enabled: Boolean(brand) && Boolean(sku),
    retry: false,
    ...stable,
  });
}

/**
 * A tenant's products, at one branch or across all of them.
 *
 * `locationid` of 0 or undefined means EVERY branch, and the backend answers it
 * — one row per product, stock summed across outlets. It did not always: the
 * read required a single branch, so "All branches" listed the FIRST one and a
 * merchant with five outlets saw four products at RS Puram instead of the six
 * they stock. Picking one branch showed more than picking all of them.
 *
 * So the tenant alone is enough to run this query now. Gating on `locationid`
 * is what turned a missing backend feature into a silently wrong list.
 */
export function useLocationProducts(
  tenantid: number | undefined,
  locationid: number | undefined,
  page = 0,
  options: {
    /**
     * Treat a missing branch as "every branch" rather than as "not ready yet".
     *
     * Off by default, and that default is the safe one. A Store user is pinned
     * to a single outlet and their branch resolves asynchronously — so during
     * that window an opt-out default would answer tenant-wide and show them
     * every other branch's stock as if it were their own.
     *
     * The admin catalogue opts in, because there "All branches" is a real
     * selection a merchant made, not a value that has not arrived.
     */
    allBranches?: boolean;
  } = {},
) {
  const wantsAll = options.allBranches === true;
  return useQuery({
    queryKey: queryKeys.products.byLocation(tenantid ?? 0, locationid ?? 0, page),
    queryFn: () =>
      productsApi.locationProducts({
        tenantid: tenantid as number,
        // 0 is meaningful to the backend here, not a missing value.
        locationid: locationid ?? 0,
        pageno: page,
      }),
    enabled: Boolean(tenantid) && (wantsAll || Boolean(locationid)),
    ...live,
  });
}

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

/*
No `useLocationSummary`.

It had four callers — Reports, both Consoles and the platform's store detail —
and every one of them read `revenue` and `totalorders` off its rows. Neither
field is in the response; it carries counts under different names and no money
at all. So every "App revenue" on this console read ₹0 against shops with real
takings, and nothing went red because both fields were optional on a type with
an index signature.

It also ignores `fromdate`/`todate`, so even the counts it does return are
all-time whatever the date picker says.

Per-branch figures now come from the order rows via `branchOrderStats`, which
has both the money and a working date filter. `insightsApi.locationSummary`
stays in the API map, correctly typed, if the counts are ever wanted.
*/

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,
  });
}

/* ── 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,
  });
}

/**
 * The stock statement for EVERY branch in scope, one request each.
 *
 * `getstockstatement` takes a single `locationid` and there is no tenant-wide
 * stock read, so a multi-branch view fans out — the same constraint, and the same
 * shape of answer, as `usePosSalesByBranch`.
 *
 * The Reports inventory tab read `scoped[0]` before this: whatever branch
 * happened to sort first stood in for the whole tenant, on a page where every
 * other figure covers all of them. A reader comparing inventory value against
 * this period's revenue was comparing one shop against the chain.
 */
export function useStockStatementByBranch(
  tenantid: number | undefined,
  locationIds: readonly number[],
  params: { keyword?: string; pagesize?: number } = {},
) {
  return useQueries({
    queries: locationIds.map((locationid) => ({
      queryKey: queryKeys.stock.statement(tenantid ?? 0, locationid, params),
      queryFn: () =>
        stockApi.statement({ tenantid: tenantid as number, locationid, ...params }),
      enabled: Boolean(tenantid),
      ...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),
    /* Either scope runs it. `tenantid: 0` is what a partner-scoped read sends
       for the unused field (see `scopeQuery`), and gating on the tenant alone
       meant the platform board fetched nothing at all — the map came up empty
       against a partner whose API rows numbered 376. */
    enabled: Boolean(query?.tenantid || query?.partnerid),
    ...live,
  });
}

/**
 * Every order in the window, paged until the rows run out.
 *
 * For the screens that TOTAL orders rather than list them. `useOrders` returns
 * one page and is right for a table with a pager under it; a sum built from one
 * page is simply wrong past that page, and wrong without saying so.
 *
 * Returns the flag as well as the rows: at the page bound the figures ARE partial
 * and the screen has to say so. A caller that ignores `truncated` has recreated
 * the bug this exists to fix.
 */
export function useAllOrders(query: OrderQuery | undefined, pagesize = 500) {
  return useQuery({
    queryKey: queryKeys.insights.orderList({
      ...((query ?? {}) as unknown as Record<string, unknown>),
      all: true,
      pagesize,
    }),
    queryFn: () => insightsApi.ordersAll(query as OrderQuery, { pagesize }),
    enabled: Boolean(query?.tenantid || query?.partnerid),
    ...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),
    /* Either scope runs it. `tenantid: 0` is what a partner-scoped read sends
       for the unused field (see `scopeQuery`), and gating on the tenant alone
       meant the platform board fetched nothing at all — the map came up empty
       against a partner whose API rows numbered 376. */
    enabled: Boolean(query?.tenantid || query?.partnerid),
    ...live,
  });
}

/**
 * Riders on duty in one delivery region.
 *
 * `live` rather than `stable`, unlike the other reference lists: this one is
 * not reference data. A rider clocking on or off changes it during the shift,
 * and a picker offering somebody who went home twenty minutes ago sends the
 * order nowhere.
 *
 * Scoped by `applocationid`. Passing a tenant instead returns an empty list
 * with a 200 — see `deliveriesApi.riders`.
 */
export function useRiders(scope: {
  /** The merchant's own riders. */
  tenantid?: number | undefined;
  /** A delivery partner's riders. */
  partnerid?: number | undefined;
  /** Only used when neither of the above is given. */
  applocationid?: number | undefined;
}) {
  const { tenantid, partnerid, applocationid } = scope;
  return useQuery({
    // The scope is part of the key, or one fleet's riders would be served to
    // the other after a toggle.
    queryKey: [...queryKeys.insights.all, 'riders', tenantid ?? 0, partnerid ?? 0, applocationid ?? 0] as const,
    queryFn: () => deliveriesApi.riders({ tenantid, partnerid, applocationid }),
    enabled: Boolean(tenantid || partnerid || applocationid),
    ...live,
  });
}

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

/** The back-office directory. Role names arrive resolved; never map ids here. */
/**
 * The branch's customers.
 *
 * Page size is always sent — see `customersApi`. Left off, the backend returns
 * an empty list rather than an error, which reads as "no customers".
 */
export function useCustomers(query: CustomerQuery | undefined) {
  return useQuery({
    queryKey: queryKeys.customers.list({ ...query }),
    queryFn: () => customersApi.list(query as CustomerQuery),
    enabled: Boolean(query?.tenantid),
    ...live,
  });
}

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.
 */
/**
 * Till accounts, per branch.
 *
 * `includeInactive` is opt-in and part of the cache key, so a page that wants
 * to keep a switched-off cashier on screen gets them without changing what
 * every other caller sees — see `posUsersApi.list` for why the default stayed
 * as it was.
 */
export function usePosUsersByBranch(
  tenantid: number | undefined,
  locationIds: readonly number[],
  includeInactive = false,
) {
  return useQueries({
    queries: locationIds.map((locationid) => ({
      queryKey: [...queryKeys.people.posUsers(tenantid ?? 0, locationid), includeInactive] as const,
      queryFn: () => posUsersApi.list(tenantid as number, locationid, includeInactive),
      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,
  });
}

/**
 * The signed-in merchant's own business record.
 *
 * `gettenantinfo`, not `listAll`. The latter is `getalltenants` — paginated
 * across 262 merchants — so a shop on page two was simply not found, and a
 * profile screen built on it would show nothing with no visible reason why.
 */
export function useOwnTenant(tenantid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.tenants.byId(tenantid ?? 0),
    queryFn: () => tenantsApi.byId(tenantid as number),
    enabled: Boolean(tenantid),
    ...stable,
  });
}

/** Upload receipts for a shop — used by the Uploads page and the setup checklist. */
export function useUploads(tenantid: number | undefined, locationid?: number) {
  return useQuery({
    queryKey: queryKeys.uploads.list(tenantid ?? 0, locationid ?? 0),
    queryFn: () => uploadsApi.list({ tenantid, ...(locationid ? { locationid } : {}) }),
    enabled: Boolean(tenantid),
    ...stable,
  });
}

/**
 * The rider directory — everyone, whether or not they are working today.
 *
 * `stable`, not `live`, and that is the difference from `useRiders`. This is a
 * staff list: it changes when somebody is hired or edited, not through the day
 * as shifts start and end. The on-duty read is the one that has to keep asking.
 */
export function useRiderRoster(tenantid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.insights.riderRoster(tenantid ?? 0),
    queryFn: () => ridersApi.roster(tenantid as number),
    enabled: Boolean(tenantid),
    ...stable,
  });
}

/** Shifts a rider can be put on. Scoped by region; the param is required. */
export function useRiderShifts(applocationid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.insights.riderShifts(applocationid ?? 0),
    queryFn: () => ridersApi.shifts(applocationid as number),
    enabled: Boolean(applocationid),
    ...stable,
  });
}

/** Delivery partners in a region. */
export function usePartners(applocationid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.insights.partners(applocationid ?? 0),
    queryFn: () => ridersApi.partners(applocationid as number),
    enabled: Boolean(applocationid),
    ...stable,
  });
}

/**
 * Live positions for a set of riders.
 *
 * ── Fanned out, because there is no fleet form ────────────────────────────
 *
 * `getriderperiodiclogs` answers for one rider at a time. A merchant's round is
 * a handful of riders, so a handful of requests every fifteen seconds is
 * cheap — and the fan-out means one rider's failure does not blank the others,
 * which a single fleet call would.
 *
 * ── Fifteen seconds, matching the source ──────────────────────────────────
 *
 * The rider app reports every twenty seconds or so, so polling faster only
 * re-reads the same fix. Fifteen keeps the board a beat ahead of the data
 * without asking for anything that does not exist yet.
 *
 * Paused when the tab is hidden: nobody is watching a map they cannot see, and
 * a background tab polling a third-party service all afternoon is rude.
 */
export function useRiderLive(userids: readonly number[], isEnabled = true) {
  const ids = [...new Set(userids)].filter((id) => id > 0);

  const results = useQueries({
    queries: ids.map((userid) => ({
      queryKey: queryKeys.live.rider(userid),
      queryFn: ({ signal }: { signal: AbortSignal }) => telemetryApi.rider(userid, signal),
      enabled: isEnabled,
      refetchInterval: isEnabled ? 15_000 : false,
      refetchIntervalInBackground: false,
      // A stale fix is worth drawing while the next one is fetched; blanking
      // the map every fifteen seconds would make it unreadable.
      staleTime: 10_000,
      retry: 1,
    })),
  });

  const byRider = new Map<number, RiderSnapshot | null>();
  results.forEach((result, index) => {
    const id = ids[index];
    if (id !== undefined) byRider.set(id, result.data ?? null);
  });

  return {
    data: byRider,
    isLoading: results.some((result) => result.isLoading),
    /** True while any rider is being re-read — for a quiet "updating" hint. */
    isFetching: results.some((result) => result.isFetching),
  };
}

/**
 * What is in one order — the line items, and the total Fiesta computed.
 *
 * Enabled only when a drawer is actually open on an order, because this is a
 * request per order and the list behind it can hold hundreds. A delivery row
 * carries the same `orderheaderid`, so the same hook serves both kinds of sheet.
 */
export function useOrderItems(orderheaderid: number | undefined) {
  return useQuery({
    queryKey: queryKeys.insights.orderItems(orderheaderid ?? 0),
    queryFn: () => insightsApi.orderItems(orderheaderid as number),
    enabled: Boolean(orderheaderid),
    ...stable,
  });
}