import 'package:flutter_test/flutter_test.dart';

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

/// ─────────────────────────────────────────────────────────────────────────
/// BOOKING WORDS ARE NOT CONSIGNMENT WORDS
///
/// The delivery half of the lifecycle lives on the consignment, and the app
/// spent a long time inferring it from the booking — whose story ends at
/// `Converted_To_Consignment` and never mentions delivery at all. These pin
/// the vocabulary boundary and the one state `deliver` accepts.
///
/// Root cause this suite exists to prevent, verified against the live API on
/// 2026-08-21: `POST /miler/consignments/:id/deliver` answers
/// `400 consignment is not out for delivery` for **two opposite** situations —
/// "still at the hub" and "already delivered". Consignment 34's own history
/// read `Out_for_Delivery` then `Delivered`; the app showed the rider an error
/// for work he had completed an hour earlier, because the only state it could
/// see was the booking's terminal word.
/// ─────────────────────────────────────────────────────────────────────────
void main() {
  group('parsing', () {
    test('the consignment vocabulary is understood in every spelling', () {
      expect(
        consignmentStateFromRaw('Out_for_Delivery'),
        ConsignmentState.outForDelivery,
      );
      expect(
        consignmentStateFromRaw('out for delivery'),
        ConsignmentState.outForDelivery,
      );
      expect(
        consignmentStateFromRaw('OUTFORDELIVERY'),
        ConsignmentState.outForDelivery,
      );
      expect(consignmentStateFromRaw('Delivered'), ConsignmentState.delivered);
      expect(
        consignmentStateFromRaw('Inwarded_at_Hub'),
        ConsignmentState.inwardedAtHub,
      );
    });

    test('BOOKING words are not consignment states', () {
      // The exact confusion that produced the bug: these are booking-side
      // words, and none of them may resolve to a deliverable consignment.
      for (final booking in const [
        'Converted_To_Consignment',
        'Picked_Up',
        'Pickup_Scheduled',
        'Miler_Assigned',
        'Pending_Pickup',
      ]) {
        final state = consignmentStateFromRaw(booking);
        expect(
          state,
          ConsignmentState.unknown,
          reason:
              '"$booking" is a BOOKING status; it must not name a '
              'consignment state',
        );
        expect(state.isDeliverable, isFalse);
      }
    });

    test('an unknown status is never deliverable and never finished', () {
      final s = consignmentStateFromRaw('Teleported');
      expect(s, ConsignmentState.unknown);
      expect(s.isDeliverable, isFalse);
      expect(s.isDelivered, isFalse);
      expect(s.isClosed, isFalse);
      expect(s.awaitsHub, isFalse);
      expect(ConsignmentGate.gateFor(s), DeliverGate.unknown);
    });

    test('empty and null are unknown, not deliverable', () {
      expect(consignmentStateFromRaw(null).isDeliverable, isFalse);
      expect(consignmentStateFromRaw('').isDeliverable, isFalse);
    });
  });

  group('the gate', () {
    test('only Out_for_Delivery may be delivered', () {
      for (final s in ConsignmentState.values) {
        expect(
          s.isDeliverable,
          s == ConsignmentState.outForDelivery,
          reason:
              '${s.name} must ${s == ConsignmentState.outForDelivery ? '' : 'not '}'
              'be deliverable',
        );
      }
      expect(
        ConsignmentGate.gateFor(ConsignmentState.outForDelivery),
        DeliverGate.deliverable,
      );
    });

    test('an already-delivered consignment reconciles, it does not error', () {
      expect(
        ConsignmentGate.gateFor(ConsignmentState.delivered),
        DeliverGate.alreadyDelivered,
        reason: 'the work is done server-side; the device is what is behind',
      );
    });

    test('a genuine hub hold stays blocked — the logistics guard', () {
      // The guard the brief requires be kept: a consignment inside the hub's
      // half of the network is not this rider's to hand over.
      //
      // `Created` is deliberately NOT in this list — see the test below.
      for (final s in const [
        ConsignmentState.inwardedAtHub,
        ConsignmentState.tripsheetLoaded,
        ConsignmentState.inTransit,
      ]) {
        expect(s.awaitsHub, isTrue, reason: '${s.name} is hub-side');
        expect(s.isDeliverable, isFalse);
        expect(ConsignmentGate.gateFor(s), DeliverGate.awaitingHub);
      }
    });

    test('`Created` is the rider\'s own parcel, not a hub hold', () {
      // The bug this pins: `Created` was in the hub list, so sliding **Start
      // ride** on a freshly converted consignment answered "This parcel is
      // with the hub — it will be delivered from there, not by you" about a
      // bag on the rider's own back, and nothing on that screen cleared it.
      //
      // The backend writes `Created` at the pivot for hub-routed work
      // (`next_action: inward_at_hub`) and holds it there transiently while
      // hyperlocal work is routed. The hub has not taken it in either way.
      const s = ConsignmentState.created;
      expect(s.awaitsHub, isFalse, reason: 'the hub has never seen it');
      expect(s.awaitsHubInward, isTrue);
      expect(ConsignmentGate.gateFor(s), DeliverGate.awaitingInward);

      // Still not deliverable: `deliver` only accepts `Out_for_Delivery`. The
      // fix changes which sentence the rider is shown, never what is claimed.
      expect(s.isDeliverable, isFalse);
      expect(s.needsRelease, isFalse);

      // And no other state may drift into the new rung.
      for (final other in ConsignmentState.values) {
        if (other == ConsignmentState.created) continue;
        expect(
          other.awaitsHubInward,
          isFalse,
          reason: '${other.name} is not the pre-inward rung',
        );
      }
    });

    test('closed work is refused without blaming the rider', () {
      for (final s in const [
        ConsignmentState.cancelled,
        ConsignmentState.returnedToSender,
      ]) {
        expect(ConsignmentGate.gateFor(s), DeliverGate.closed);
        expect(s.isDeliverable, isFalse);
      }
    });

    test('an unreadable state does not block the rider', () async {
      // A failed GET is not evidence of anything. Blocking here would strand a
      // rider at a door because a read timed out; the server stays the judge.
      expect(
        ConsignmentGate.gateFor(ConsignmentState.unknown),
        DeliverGate.unknown,
      );
      // No id is unreadable, and must not throw or hang.
      expect(await ConsignmentGate.stateOf(''), ConsignmentState.unknown);
      expect(await ConsignmentGate.stateOf('0'), ConsignmentState.unknown);
    });
  });
}