import 'package:flutter/foundation.dart';
import 'package:get/get.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'package:miler/data/api_config.dart';

/// ─────────────────────────────────────────────────────────────────────────
/// WHICH LINE OF WORK THIS RIDER IS ON
///
/// One company — **Doormile** — running two lines of work out of one rider app.
///
///  • **Parcel.** First-mile logistics: collect a consignment from a customer,
///    carry it to the hub, cash on delivery, proof at every door. The app's
///    original business.
///
///  • **Meals.** Subscription food runs for clients with cloud kitchens: load a
///    crate of lunches at the kitchen, drop them to subscribers who have already
///    paid by the month, go home. No money at any door, no chain of custody, a
///    different shape of day entirely.
///
/// The two used to be two separate rider apps. They are one app now, and which
/// line a rider is on is decided by the **tenant id on his login** — the hub
/// assigns it, the app reads it once and never asks again.
///
/// ── Why the tenant and not the trip ──
///
/// The earlier design note for mixed routes argued for keying behaviour off the
/// *stop*, because one rider can hold a pickup and a delivery in the same hour.
/// That argument does not apply here: the two lines have separate riders,
/// separate hubs and separate clients. A rider belongs to one of them for the
/// life of his account, and `tenantid` is already on the login response — so it
/// resolves once, at login, and nothing downstream has to ask again.
///
/// ── The one rule for using this ──
///
/// Screens read a **capability**, never a line. `if (profile.collectsCash)`,
/// not `if (line == ServiceLine.meals)`. Capabilities are why signing a third
/// kind of client later is a new [ServiceProfile] rather than a third UI: the
/// day a food client wants cash on delivery, or a parcel client wants crate
/// loading, the screens are already asking the right question.
/// ─────────────────────────────────────────────────────────────────────────
enum ServiceLine {
  /// Parcel logistics. The app's original and largest business.
  parcel,

  /// **Milk Man delivery** — load a crate at a source (a kitchen), then drop
  /// to the customers who ordered from it.
  ///
  /// Named `milkMan` after the operation the hub runs; the code called this
  /// `meals` while it had one food client, and the shape of the work — collect
  /// in bulk from one or more sources, then a round of prepaid drops — is the
  /// same whatever is in the crate.
  milkMan,

  /// Last-mile delivery: carry consignments out of the hub and hand them to
  /// customers. The Xpress-rider app's business.
  ///
  /// ── Why this one is different from the other two ──
  ///
  /// [parcel] and [meals] are the *same screens* with different capabilities
  /// switched on. This one is not: it has its own screens, ported verbatim from
  /// the Xpress-rider app and living under `lib/xpress`. A delivery rider gets
  /// that app — its home, its deliveries list, its summary, its four-tab bottom
  /// bar — wearing Doormile's colours.
  ///
  /// So the capabilities on [ServiceProfile.delivery] are close to decorative:
  /// almost nothing reads them, because the delivery screens do not ask the
  /// capability questions the parcel screens ask. What this line is *for* is the
  /// routing decision in `helpers/rider_shell.dart`, which is the only place
  /// that has to know.
  delivery,
}

/// The moment a stop leaves Home for the work tab. See [ServiceProfile.handoffAt].
enum HandoffPoint {
  /// As soon as the rider accepts it.
  accepted,

  /// Only once he is physically carrying it.
  collected,
}

/// What this line of work requires of the rider at the door.
@immutable
class ServiceProfile {
  final ServiceLine line;

  /// Shown wherever the rider needs to know which work this is.
  ///
  /// Both lines are Doormile — the rider's employer does not change with the
  /// crate he is carrying — so this names the *work*, not a company.
  final String label;

  /// ── The one noun the whole app uses for a job ──
  ///
  /// The two rider apps this one replaces disagreed about what a job is called:
  /// the parcel app said **booking**, the meal app said **delivery**. Merging
  /// them meant picking one, and there is no single honest answer — a rider who
  /// collects parcels for the hub does not "deliver" them, and a rider handing
  /// somebody lunch has not taken a "booking".
  ///
  /// So the noun follows the line, and every string that names a job reads it
  /// from here: the tab in the nav bar, the accepted-count pill, the sentence on
  /// a taken stop, the empty states. A rider only ever belongs to one line, so
  /// he only ever sees one word — and the code has one path, not two.
  ///
  /// Capitalised where a label needs it; see [workTabLabel].
  final String jobNoun;

  /// Plural of [jobNoun] — English is not regular enough to derive it.
  final String jobNounPlural;

  /// What the nav bar calls the tab holding accepted work.
  ///
  /// "Bookings" on a parcel route, "Deliveries" on a meal run. Title case
  /// because it is a proper destination in the app, not a word in a sentence.
  String get workTabLabel =>
      jobNounPlural[0].toUpperCase() + jobNounPlural.substring(1);

  /// The verb for finishing a stop, in the rider's voice: "Picked up" when he
  /// is taking something away, "Delivered" when he is handing it over.
  ///
  /// A meal run's stops are all drops, so its rider never sees "Picked up" at a
  /// customer's door — that word belongs to the kitchen, where he loads.
  final String completionVerb;

  /// Money changes hands at the stop. False for a subscription service — the
  /// client is billed monthly, so the rider never sees an amount.
  ///
  /// Read through [stopCollectionAmount], which returns 0 when this is false,
  /// so every existing "is anything owed?" branch already does the right thing.
  final bool collectsCash;

  /// The full proof-of-work page — parcel ticks, weight, condition, OTP,
  /// photo, review. Right for a parcel with a chain of custody; wrong for a
  /// lunch box, where it is a two-minute form standing between a rider and a
  /// doorbell.
  ///
  /// **Nothing reads this today.** The page is off on both tenants: arriving
  /// goes straight to the confirmation sheet, which asks the one question a
  /// stop actually has an answer to — picked up, not picked, or skipped. The
  /// capability and [StopVerificationPage] both survive because the form is
  /// what a chain-of-custody client would need on the day one asks for it, and
  /// this is the switch that would turn it back on for that tenant alone.
  final bool needsVerification;

  /// A camera step on the final status change.
  final bool needsProofPhoto;

  /// The rider decides stop by stop. False for a service run: he cannot
  /// decline one subscriber's lunch, so the whole assignment is accepted at
  /// once and the per-row Accept/Reject controls come off the card.
  final bool acceptsPerStop;

  /// Collection is grouped by source (a kitchen), not done per customer.
  ///
  /// Also what makes Home group its stops under a heading per source and offer
  /// one bulk collect per group: a rider standing at a counter with a crate is
  /// doing one thing, not five.
  final bool sourceIsKitchen;

  /// When a stop stops being Home's problem and becomes the work tab's.
  ///
  /// A parcel route hands off at **accept**: taking a booking is the decision,
  /// and everything after it happens at the customer's door.
  ///
  /// A meal run hands off at **collect**, because accepting changes nothing
  /// physical — the rider still has to go to a kitchen and be given the food.
  /// Moving the card at accept would empty Home the moment he arrived for his
  /// shift and leave him working a list of meals he is not carrying. So the rule
  /// is: **Home holds an order until it is in his hands.**
  final HandoffPoint handoffAt;

  /// One name for every stop's work type, or null to let each stop name its own
  /// (`PICKUP` / `DELIVERY` / `P&D`).
  ///
  /// A meal run is one job repeated — collect a crate, drop the boxes — and
  /// labelling half of a rider's day PICKUP and half DELIVERY invites him to
  /// look for a difference in handling that does not exist. The stop's real
  /// kind is still tracked underneath, because the collection gate in P3 needs
  /// it; this is only what the chip says.
  final String? workTypeLabel;

  /// Loading is done crate-at-a-counter, so it takes one photo for the whole
  /// load rather than one per order.
  ///
  /// A rider standing at a kitchen hatch with fifteen boxes cannot photograph
  /// each one, and the thing worth photographing is the *crate* — what he was
  /// handed, in one frame, at one time. False on a parcel route, where proof is
  /// per consignment because each one has its own chain of custody.
  final bool bulkLoadProof;

  /// The rider asks the customer where this shipment is coming from and going
  /// to, and the answers are written back to the booking.
  ///
  /// ── Why this is a rider's job at all ──
  ///
  /// A logistics booking often arrives half-addressed: the customer raised it
  /// from a map pin and described the destination as a phone number and a
  /// landmark. The rider is the first person standing in front of the sender
  /// who can ask. Those answers decide the consignment's routing and its
  /// pricing zone, so they have to be captured before the order is initiated.
  ///
  /// False on a milk run, where both ends were fixed when the customer
  /// subscribed and there is nothing for the rider to establish.
  final bool capturesShipmentAddresses;

  /// The fare is computed at the door from the real shipment, and shown to the
  /// customer before he pays.
  ///
  /// Follows [capturesShipmentAddresses] — a price needs a from, a to and a
  /// weight, and a line that does not collect the first two cannot quote.
  final bool pricesShipment;

  /// Collection ends by converting the booking into a live shipment with a
  /// tracking number — the moment the order really exists.
  ///
  /// On a milk run collection is the *middle* of the day, not the end of a
  /// transaction, so there is nothing to initiate.
  final bool initiatesShipment;

  /// The rider carries the load on to the customers himself.
  ///
  /// True for a milk run: collection is followed by a round of drops he makes
  /// personally. False for logistics, whose collected shipment goes to the hub
  /// and is delivered by somebody else on another day — which is why that line
  /// ends at a warehouse and this one ends at the last door.
  final bool deliversToCustomer;

  /// Delivery does not begin until every assigned pickup is in the rider's
  /// hands, and it begins on an explicit press.
  ///
  /// ── Why the whole load, and why a press ──
  ///
  /// A milk-run rider works two or three sources before he starts driving to
  /// customers. Letting each collected order drift into the delivery list on
  /// its own gives him a half-built round: he sets off after kitchen one, and
  /// kitchen two's five orders appear behind him. So the round is held until
  /// the load is complete and then released in one gesture, which is also the
  /// moment the shipments legitimately become "out for delivery" server-side.
  final bool startsDeliveryAfterFullLoad;

  const ServiceProfile({
    required this.line,
    required this.label,
    required this.jobNoun,
    required this.jobNounPlural,
    required this.completionVerb,
    required this.collectsCash,
    required this.needsVerification,
    required this.needsProofPhoto,
    required this.acceptsPerStop,
    required this.sourceIsKitchen,
    required this.handoffAt,
    this.bulkLoadProof = false,
    this.capturesShipmentAddresses = false,
    this.pricesShipment = false,
    this.initiatesShipment = false,
    this.deliversToCustomer = false,
    this.startsDeliveryAfterFullLoad = false,
    this.workTypeLabel,
  });

  /// First-mile parcel logistics — the app as it has always been. Also the
  /// fallback for an unrecognised tenant, see [TenantController.load].
  static const ServiceProfile parcel = ServiceProfile(
    line: ServiceLine.parcel,
    label: 'Doormile',
    jobNoun: 'booking',
    jobNounPlural: 'bookings',
    completionVerb: 'Picked up',
    collectsCash: true,
    needsVerification: true,
    needsProofPhoto: true,
    acceptsPerStop: true,
    sourceIsKitchen: false,
    handoffAt: HandoffPoint.accepted,
    // The full shipment desk at the customer's door: where is it from, where
    // is it going, what does it weigh, what does that cost, and take the money
    // — then turn it into a real consignment bound for the hub.
    capturesShipmentAddresses: true,
    pricesShipment: true,
    initiatesShipment: true,
    // The collected shipment goes to the hub; somebody else delivers it.
    deliversToCustomer: false,
    // Each stop names its own kind: a parcel route genuinely mixes them.
    workTypeLabel: null,
  );

  /// **Milk Man delivery.** Load a crate at one or more sources, then a round
  /// of prepaid drops. No money, no verification form, no per-stop decision.
  static const ServiceProfile milkMan = ServiceProfile(
    line: ServiceLine.milkMan,
    label: 'Doormile Delivery',
    jobNoun: 'delivery',
    jobNounPlural: 'deliveries',
    completionVerb: 'Delivered',
    collectsCash: false,
    needsVerification: false,
    needsProofPhoto: false,
    acceptsPerStop: false,
    sourceIsKitchen: true,
    handoffAt: HandoffPoint.collected,
    bulkLoadProof: true,
    // None of the shipment desk: these orders were booked and paid for before
    // the rider's shift started.
    capturesShipmentAddresses: false,
    pricesShipment: false,
    initiatesShipment: false,
    // He collects the load and delivers it himself, once it is all aboard.
    deliversToCustomer: true,
    startsDeliveryAfterFullLoad: true,
    // One word, deliberately. The chip is a fixed slot beside the state tag and
    // a two-word label is the one that gives way — "MILK RU…" on every card in
    // the list. `test/service_card_test.dart` holds this.
    // ── Never the internal name of the line ──
    //
    // This was `MILK`, and it was printed on the rider's cards and on his
    // Activity record as `Type: MILK`. That is the app's own vocabulary for a
    // *service profile* — an implementation detail he did not choose, cannot
    // change and gains nothing from. What he is actually doing at every stop
    // on this line is a delivery, so that is what the mark says.
    //
    // The profile itself stays exactly as it was: it is what separates one
    // rider's records from another's and decides which capabilities exist.
    // That separation is a data rule, and it belongs in the data, not on a
    // badge.
    workTypeLabel: 'DELIVERY',
  );

  /// The old name for [milkMan], from when the line had one food client.
  ///
  /// Kept so the existing call sites and tests that name it this way keep
  /// compiling; there is one profile, under two names.
  static const ServiceProfile meals = milkMan;

  /// Last-mile delivery — the ported Xpress-rider flow.
  ///
  /// The capability values here describe the work honestly (a delivery rider
  /// does collect cash on COD, does photograph a doorstep, does take jobs one at
  /// a time), but almost nothing reads them: this line renders its own screens,
  /// so it does not go through the capability branches the parcel screens use.
  /// They matter only if a delivery rider is ever routed into a shared screen.
  static const ServiceProfile delivery = ServiceProfile(
    line: ServiceLine.delivery,
    label: 'Doormile',
    jobNoun: 'delivery',
    jobNounPlural: 'deliveries',
    completionVerb: 'Delivered',
    collectsCash: true,
    needsVerification: false,
    needsProofPhoto: true,
    acceptsPerStop: true,
    sourceIsKitchen: false,
    handoffAt: HandoffPoint.accepted,
    workTypeLabel: 'DELIVERY',
  );

  /// True when an accepted stop stays on Home until the rider is carrying it.
  bool get handsOffAtCollection => handoffAt == HandoffPoint.collected;

  /// True when every stop wears the same work-type mark — see [workTypeLabel].
  bool get usesSingleWorkType => workTypeLabel != null;

  /// True on the Milk Man line — collect at a source, then deliver.
  bool get isMilkMan => line == ServiceLine.milkMan;

  /// The old name for [isMilkMan].
  bool get isMeals => isMilkMan;

  /// ── Whether the backend can serve this line's work at all ──
  ///
  /// True on every line, and that is a correction, not a shortcut. This read
  /// `!sourceIsKitchen`, on the reasoning that the `/miler/*` contract serves
  /// bookings and consignments while kitchens, crates and subscribers are not
  /// concepts it has — so a milk-man rider could have no endpoint to ask.
  ///
  /// **The hub does not dispatch that way.** The console's dispatch board reads
  /// the milk round from `GET /admin/bookings` and puts a rider on a stop with
  /// `POST /hub/bookings/:id/auto-assign`; the rider-facing read of those very
  /// rows is `GET /miler/bookings`. A milk round *is* bookings today. The
  /// kitchen vocabulary describes how this app **renders** the work — load at a
  /// source, hand off at collection, one MILK chip per card — not where the
  /// work comes from.
  ///
  /// While the two were conflated, a rider on the milk-man line could not be
  /// given work at all: [WorkRepository] returns `LoadUnavailable` on a false
  /// answer here and never issues the request, so Home, Bookings and Activity
  /// were all blank however many bookings the hub had assigned him. That is how
  /// it was found — Rajan A (userid 38, tenant 13) was assigned a booking in the
  /// console and the app showed him nothing, with no failure anywhere to
  /// explain it.
  ///
  /// The flag stays because the state it feeds is worth keeping: a line the
  /// backend genuinely cannot answer for should render "your hub has not
  /// enabled this yet" rather than an empty list that reads as a quiet day. It
  /// is now something a future line sets deliberately, not something a rider
  /// inherits from how his round is shaped.
  ///
  /// It must never be satisfied by [MealRunMock]. That fixture is an opt-in
  /// development tool behind `--dart-define=MOCK_BACKEND=true`; wiring it in
  /// here would put fabricated business data on a production path.
  bool get hasBookingsEndpoint => true;

  /// True when the rider's day ends back at the depot.
  ///
  /// A logistics rider collects shipments at customers' doors and carries them
  /// to the hub, so the last leg of his route is a building. A **milk-man**
  /// round is the other way up: he loads at the kitchen at the start and his
  /// last address is a customer's door, so there is nothing to return and
  /// nowhere to return it to — his day ends when the round does.
  ///
  /// Derived from [deliversToCustomer] rather than stored, because they are the
  /// same fact: a line that hands goods to the customer has already delivered
  /// its load by the time it finishes.
  bool get endsAtHub => !deliversToCustomer;

  /// True on the Logistics line — the shipment desk at the customer's door.
  bool get isLogistics => line == ServiceLine.parcel;

  /// The old name for [isLogistics].
  bool get isParcel => isLogistics;

  /// True when this rider gets the ported Xpress-rider screens rather than the
  /// parcel ones. Read by `helpers/rider_shell.dart` and by nothing else — see
  /// the note on [ServiceLine.delivery].
  bool get isDelivery => line == ServiceLine.delivery;

  // ── Reading the active profile ──
  //
  // A plain static, deliberately, and not a GetX lookup.
  //
  // [stopCollectionAmount] is a pure map helper called from model code and from
  // tests with no widget tree at all. Routing it through `Get.put` made it
  // initialise a real `WidgetsFlutterBinding` as a side effect of asking "is
  // any money owed here?" — which is enough to stop an unrelated widget test in
  // another file from starting at all. Data code must not be able to boot the
  // framework.
  //
  // [TenantController] still owns loading and still publishes an `Rx` for
  // screens that want to rebuild; this is the synchronous read everything else
  // uses.

  static ServiceProfile _active = parcel;

  /// The signed-in rider's profile.
  ///
  /// Parcel until [TenantController.load] says otherwise — see that method for
  /// why the fallback runs in that direction.
  static ServiceProfile get active => _active;

  /// Sets the active profile. Called by [TenantController.load]; also the seam
  /// tests use to put the app on one line or the other.
  static void setActive(ServiceProfile profile) => _active = profile;
}

/// Resolves the rider's line of work from what login persisted.
///
/// Order: **the rider's own tenant** (name, then id) → build override →
/// logistics.
///
/// ── Why the server now wins over the build flag ──
///
/// This used to read the `TENANT` dart-define first, because `verify-pin`
/// returned no tenant at all and the flag was the only signal there was. That
/// is no longer true: the login response carries `tenantid` and `tenantname`,
/// so the rostered answer exists and the app can simply ask.
///
/// Which way round these two go is a real decision, not a detail. "Which work
/// am I doing today?" must be answered by the hub that rostered the rider, not
/// by whoever compiled the APK — one build serves every rider, and a flag that
/// outranks the account means one wrong build puts every rider on the wrong
/// flow. So the flag is now what it should always have been: a fallback for
/// builds signed in against a backend that cannot answer, and a way to demo a
/// line without a matching account.
///
/// A free function rather than a controller method so it can be tested without
/// a GetX container — see the note on [ServiceProfile.active].
Future<ServiceProfile> resolveServiceProfile() async {
  final prefs = await SharedPreferences.getInstance();

  // ── What the rider's account says ──
  //
  // Name first: it is the field a human can check against the admin console,
  // and it means a new tenant does not need an app release. An unrecognised
  // name is not an answer, so it falls through to the id.
  final name = (prefs.getString(TenantController.kTenantName) ?? '')
      .trim()
      .toLowerCase();
  if (name.isNotEmpty) {
    final byName = TenantController.profileForName(name);
    if (byName != null) return byName;
  }

  final id = prefs.getInt(TenantController.kTenantId) ?? 0;
  if (id != 0) {
    final byId = TenantController.profileForId(id);
    if (byId != null) return byId;
  }

  // ── The tenant the session's own token claims ──
  //
  // Read after the persisted pair and before the build flag, and it exists for
  // two cases the pair does not cover.
  //
  // The first is a backend whose `verify-pin` does not return the tenant in its
  // body. It signs one into every token regardless, so the answer is in the
  // app's hands either way — this is the same fact from the same source.
  //
  // The second is the rider who is **already signed in**. His prefs were
  // written by an older build that stored tenant 0, and nothing would correct
  // that until he happened to log out; reading his live session instead means
  // the next launch resolves him properly with no action from him at all.
  //
  // Not a security decision — see [ApiConfig.tenantIdFromToken].
  final claimed = ApiConfig.tenantIdFromToken(prefs.getString('authtoken'));
  if (claimed != 0) {
    final byClaim = TenantController.profileForId(claimed);
    if (byClaim != null) return byClaim;
  }

  // ── The build's declared line, as a fallback ──
  //
  // Reached only when the account said nothing this app recognises. Unset
  // means logistics, so an ordinary build is unchanged.
  if (TenantController.buildOverride.isNotEmpty) {
    final override = TenantController.buildOverride.trim().toLowerCase();
    final byOverride = TenantController.profileForName(override);
    if (byOverride != null) return byOverride;
    // The ported Xpress line is reachable ONLY from the build flag — never
    // from a tenant name or id off the wire. It is a reference implementation
    // that lives beside this app, not one of the two operations the hub runs,
    // and a tenant that happened to be called "delivery" must not tip a live
    // rider into a different application. See `helpers/rider_shell.dart`.
    if (TenantController.deliveryTenantNames.contains(override)) {
      return ServiceProfile.delivery;
    }
  }

  return ServiceProfile.parcel;
}

/// Resolves the signed-in rider's line of work, once, and hands out its profile.
///
/// Follows [DutyController]: a permanent GetX singleton with a `.to` accessor
/// and a `load()` that reads persisted prefs, so any screen can read the
/// profile synchronously without an await in `build`.
class TenantController extends GetxController {
  /// Parcel until proven otherwise — see [load] for why that direction.
  final Rx<ServiceProfile> profile = ServiceProfile.parcel.obs;

  /// Persisted by the login response. See `auth_provider.dart`.
  static const String kTenantId = 'tenantid';
  static const String kTenantName = 'tenantname';

  /// Tenant ids whose riders work the **Milk Man** line.
  ///
  /// **This is the switch the hub actually operates.** A rider is put on the
  /// milk-run flow by being given one of these tenant ids at login and nothing
  /// else — no separate app, no separate build, no flag on his phone.
  ///
  /// **13** is the tenant the Milk Man riders are on — the account Rajan A
  /// (userid 38) signs in with, confirmed from the `tenantid` claim on a live
  /// login against `api.doormile.com`.
  ///
  /// ── Why an id is pinned here at all ──
  ///
  /// The name is the better switch and stays the first thing checked. But the
  /// deployed backend does not return `tenantname` yet (the handler that does
  /// is written and not released), so today the id is the only signal a real
  /// rider carries. When the deploy lands, the name will match first and this
  /// becomes a belt-and-braces second answer rather than the load-bearing one.
  ///
  /// **If tenant 13 is not the milk-run client**, this line is the whole fix:
  /// remove the 13 and a rider on it goes back to logistics.
  static const Set<int> milkManTenantIds = <int>{13};

  /// The old name for [milkManTenantIds].
  static const Set<int> mealTenantIds = milkManTenantIds;

  /// Name/code match, case-insensitive, against `tenantname` on the login.
  ///
  /// Cheaper than a release for every new tenant id, and it is the field a
  /// human can actually verify against the admin console.
  static const Set<String> milkManTenantNames = <String>{
    'milkman',
    'milk man',
    'milk-man',
    'milkrun',
    'milk run',
    'meals',
    'dailygrubs',
  };

  /// The old name for [milkManTenantNames].
  static const Set<String> mealTenantNames = milkManTenantNames;

  /// Tenant ids whose riders work the **Logistics** line.
  ///
  /// Logistics is also the fallback, so this list exists to make a tenant
  /// *explicitly* logistics rather than merely unrecognised — which matters
  /// when a name would otherwise be ambiguous.
  static const Set<int> logisticsTenantIds = <int>{};

  /// The names that mean the Logistics line.
  static const Set<String> logisticsTenantNames = <String>{
    'doormile',
    'logistics',
    'parcel',
  };

  /// The old name for [logisticsTenantNames].
  static const Set<String> parcelTenantNames = logisticsTenantNames;

  /// The profile a tenant *name* means, or null when this app does not know
  /// the name. Case-insensitive; callers pass an already-lowercased string.
  ///
  /// One lookup used by both the account path and the build override, so the
  /// two can never disagree about what a name means.
  static ServiceProfile? profileForName(String name) {
    if (milkManTenantNames.contains(name)) return ServiceProfile.milkMan;
    if (logisticsTenantNames.contains(name)) return ServiceProfile.parcel;
    return null;
  }

  /// The profile a tenant *id* means, or null when this app does not know it.
  static ServiceProfile? profileForId(int id) {
    if (milkManTenantIds.contains(id)) return ServiceProfile.milkMan;
    if (logisticsTenantIds.contains(id)) return ServiceProfile.parcel;
    return null;
  }

  /// Tenant ids that would mean the ported Xpress-rider screens under
  /// `lib/xpress`.
  ///
  /// **Permanently empty, deliberately.** That subtree is a *reference*
  /// implementation kept beside this app — it is not one of the two operations
  /// the hub runs, and the Milk Man flow is now implemented natively in Miler
  /// rather than by routing riders into it.
  ///
  /// Nothing off the wire may reach it: a tenant that happened to be named
  /// "delivery" must not tip a live rider into a different application with a
  /// different bottom bar and a different set of endpoints. The only way in is
  /// the [buildOverride] flag, for looking at it. See `resolveServiceProfile`.
  static const Set<int> deliveryTenantIds = <int>{};

  /// Build-override names that open the ported Xpress screens. Never matched
  /// against a tenant off the login — see [deliveryTenantIds].
  static const Set<String> deliveryTenantNames = <String>{
    'delivery',
    'xpress',
    'express',
    'doormile xpress',
    'doormilexpress',
  };

  /// Account partitions that mean the ported delivery line. Retained for the
  /// build-override path only; nothing off the wire is matched against it.
  static const Set<int> deliveryConfigIds = <int>{6};

  /// Which line this build declares, **when the rider's account does not say**.
  ///
  ///     flutter run   --dart-define=TENANT=milkman
  ///     flutter run   --dart-define=TENANT=logistics
  ///     flutter run   --dart-define=TENANT=delivery   # the Xpress reference
  ///
  /// ── This is a testing aid, not the production switch ──
  ///
  /// A production rider's line comes from his own tenant, which `verify-pin`
  /// now returns. This flag is read only when the account carries a tenant this
  /// app does not recognise, so it cannot override a rostered rider — see the
  /// ordering note on [resolveServiceProfile].
  ///
  /// Two flags, and they answer different questions:
  ///
  ///  • `TENANT` picks the **profile**, i.e. which screens the rider gets.
  ///  • `TENANT_ID` is the **number sent to the API** — see [MilerApi.tenantId].
  ///
  /// Unset means logistics, so an ordinary build is unchanged.
  static const String buildOverride = String.fromEnvironment('TENANT');

  static TenantController get to => Get.isRegistered<TenantController>()
      ? Get.find<TenantController>()
      : Get.put(TenantController(), permanent: true);

  /// Resolves the tenant and publishes it, both to [ServiceProfile.active] for
  /// synchronous reads and to [profile] for screens that rebuild on it.
  ///
  /// The fallback direction is the point: an unconfigured or unrecognised
  /// tenant lands on **logistics**. The worst case that way is a milk-run rider
  /// seeing a payment prompt he can dismiss; the other direction takes the
  /// cash-collection screen away from a live logistics rider at a door.
  Future<ServiceProfile> load() async {
    final resolved = await resolveServiceProfile();
    ServiceProfile.setActive(resolved);
    profile.value = resolved;
    debugPrint('[TENANT] resolved ${resolved.label}');
    return resolved;
  }
}