import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'package:miler/data/miler_api.dart';
import 'package:miler/data/service_profile.dart';
import 'package:miler/views/Dashboard/pickups/shipment_capture.dart';
import 'package:miler/views/Dashboard/pickups/stop_type.dart';

/// ─────────────────────────────────────────────────────────────────────────
/// THE LOGISTICS SHIPMENT DESK
///
/// ```
///   arrived ─▶ verify ─▶ FROM ─▶ TO ─▶ weight ─▶ distance ─▶ price
///                     ─▶ payment ─▶ INITIATE ORDER ─▶ picked up ─▶ hub
/// ```
///
/// ── The rule this file is really about ──
///
/// **No number is invented.** The fare comes from the pricing table against the
/// real pincodes and the real weight; when the table has no rule for a
/// combination the screen must say so and refuse, because a locally computed
/// figure that looks official on a doorstep is how a rider ends up collecting
/// the wrong money in the company's name.
///
/// And the mirror, which is the half that breaks quietly: none of this may ever
/// appear on a milk run, where the food was booked and paid for before the
/// rider's shift started.
/// ─────────────────────────────────────────────────────────────────────────
void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  setUp(() {
    SharedPreferences.setMockInitialValues({});
    ServiceProfile.setActive(ServiceProfile.parcel);
  });
  tearDown(() => ServiceProfile.setActive(ServiceProfile.parcel));

  group('the quote never invents a fare', () {
    test('a priced combination reads the band and charges the lower end', () {
      final q = ShipmentQuote.fromData({
        'found': true,
        'zone': 'Local',
        'service_type': 'Normal',
        'weight': 2.5,
        'currency': 'INR',
        'results': [
          {
            'category': 'General',
            'category_label': 'General goods',
            'min_price': 60,
            'max_price': 90,
          },
        ],
      }, preferredCategory: 'General');

      expect(q.found, isTrue);
      expect(q.zone, 'Local');
      expect(q.minPrice, 60);
      expect(q.maxPrice, 90);
      expect(q.isRange, isTrue);
      expect(
        q.payable,
        60,
        reason:
            'the lower end is what the customer was quoted at booking; '
            'arguing about the difference on a doorstep is the worse trade',
      );
    });

    test('an unpriced combination is not a free shipment', () {
      final q = ShipmentQuote.fromData({
        'found': false,
        'zone': 'National',
        'service_type': 'Express',
        'weight': 400,
        'message': 'no pricing configured for this combination',
        'results': <dynamic>[],
      });

      expect(q.found, isFalse);
      expect(q.payable, 0);
      expect(
        q.message,
        isNotEmpty,
        reason: 'the rider must be told why, not shown a zero he might collect',
      );
    });

    test('found:true with an empty result set is still unpriced', () {
      // A malformed answer must fail the same way a clear "no" does, rather
      // than falling through to a zero that reads as free.
      final q = ShipmentQuote.fromData({
        'found': true,
        'zone': 'Local',
        'results': <dynamic>[],
      });
      expect(q.found, isFalse);
      expect(q.payable, 0);
    });

    test('the rider-named category wins over the cheapest row', () {
      final q = ShipmentQuote.fromData({
        'found': true,
        'zone': 'Local',
        'currency': 'INR',
        'results': [
          {'category': 'General', 'min_price': 50, 'max_price': 70},
          {'category': 'Fragile', 'min_price': 120, 'max_price': 160},
        ],
      }, preferredCategory: 'Fragile');

      expect(
        q.payable,
        120,
        reason:
            'he said it was fragile; pricing it as general goods '
            'undercharges the customer and under-insures the parcel',
      );
    });

    test('with no category named, the cheapest row wins', () {
      final q = ShipmentQuote.fromData({
        'found': true,
        'zone': 'Local',
        'results': [
          {'category': 'Fragile', 'min_price': 120, 'max_price': 160},
          {'category': 'General', 'min_price': 50, 'max_price': 70},
        ],
      });
      expect(q.payable, 50);
    });

    test('string prices off the wire still parse', () {
      final q = ShipmentQuote.fromData({
        'found': true,
        'zone': 'Regional',
        'results': [
          {'category': 'General', 'min_price': '80.50', 'max_price': '110'},
        ],
      });
      expect(q.minPrice, 80.5);
      expect(q.maxPrice, 110);
    });
  });

  group('the pricing contract', () {
    test('the service tiers are the pricing table\'s, not the booking\'s', () {
      // `bookingserviceoptions` uses Normal/Fast/Superfast; the pricing table
      // uses Normal/Express, and sending the wrong vocabulary is a 400.
      expect(MilerApi.serviceTypes, ['Normal', 'Express']);
    });

    test('the categories match what the handler will accept', () {
      expect(MilerApi.parcelCategories, contains('General'));
      expect(MilerApi.parcelCategories, contains('Fragile'));
      expect(MilerApi.parcelCategories, contains('Documents'));
    });
  });

  group('the shipment desk on screen', () {
    Future<void> pumpDesk(
      WidgetTester tester, {
      Map<String, dynamic>? booking,
    }) async {
      tester.view.physicalSize = const Size(1080, 2400);
      tester.view.devicePixelRatio = 3.0;
      addTearDown(tester.view.resetPhysicalSize);
      addTearDown(tester.view.resetDevicePixelRatio);

      await tester.pumpWidget(
        ScreenUtilInit(
          designSize: const Size(390, 844),
          builder: (_, _) => MaterialApp(
            home: ShipmentCapturePage(
              pickup:
                  booking ??
                  {
                    'orderid': '2001',
                    'pickupid': 2001,
                    'pickupaddress': '9 Mettupalayam Road',
                    'pickuppincode': '641002',
                    'dropaddress': '12 Cross Cut Road',
                    'droppincode': '641012',
                  },
            ),
          ),
        ),
      );
      await tester.pump();
      // The desk takes a GPS fix on open so the FROM pin is where the rider is
      // standing. There is no platform behind the channel here, so that call
      // never answers and its timeout is left holding a Timer the binding
      // rightly complains about at teardown. Running the clock past the limit
      // lets the guard fire and the widget fall back to the booking's own
      // coordinates — which is exactly the path a rider with no signal takes.
      await tester.pump(const Duration(seconds: 10));
    }

    testWidgets('asks for FROM, TO, weight, distance and price', (
      tester,
    ) async {
      await pumpDesk(tester);

      // The two ends of the journey, now named on one card with a rail
      // between them rather than as two headed groups of loose fields.
      expect(find.text('FROM'), findsOneWidget);
      expect(find.text('TO'), findsOneWidget);
      expect(find.text('THE PARCEL'), findsOneWidget);
      expect(find.text('WHAT THE CUSTOMER PAYS'), findsOneWidget);
      expect(find.text('Pickup address'), findsOneWidget);
      expect(find.text('Delivery address'), findsOneWidget);
      expect(find.text('Weight (kg)'), findsOneWidget);
    });

    testWidgets('seeds both addresses so the rider confirms, not transcribes', (
      tester,
    ) async {
      await pumpDesk(tester);
      expect(find.text('9 Mettupalayam Road'), findsOneWidget);
      expect(find.text('12 Cross Cut Road'), findsOneWidget);
      expect(find.text('641002'), findsOneWidget);
      expect(find.text('641012'), findsOneWidget);
    });

    testWidgets('will not continue without a price', (tester) async {
      await pumpDesk(tester);

      // No weight typed, so no quote has been asked for and none can exist.
      expect(find.text('Weigh the parcel'), findsOneWidget);

      final button = tester.widget<ElevatedButton>(
        find.descendant(
          of: find.byType(ShipmentCapturePage),
          matching: find.byType(ElevatedButton),
        ),
      );
      expect(
        button.onPressed,
        isNull,
        reason: 'the desk must not hand back a shipment it could not price',
      );
    });

    testWidgets('names what is missing rather than just greying out', (
      tester,
    ) async {
      await pumpDesk(tester, booking: {'orderid': '2002', 'pickupid': 2002});
      // A disabled button with no reason is the thing riders phone the hub
      // about.
      expect(find.text('Confirm the pickup address'), findsOneWidget);
    });
  });

  group('none of this reaches a milk run', () {
    test('the capabilities are all off', () {
      const p = ServiceProfile.milkMan;
      expect(p.capturesShipmentAddresses, isFalse);
      expect(p.pricesShipment, isFalse);
      expect(p.initiatesShipment, isFalse);
      expect(p.collectsCash, isFalse);
      expect(p.needsVerification, isFalse);
    });

    test('so nothing is ever owed at a milk-run door', () {
      ServiceProfile.setActive(ServiceProfile.milkMan);
      // Even a booking that arrives carrying an amount reads as zero: the food
      // was paid for by subscription and the rider must not ask for money.
      expect(stopCollectionAmount({'collectionamt': 450}), 0);

      ServiceProfile.setActive(ServiceProfile.parcel);
      expect(stopCollectionAmount({'collectionamt': 450}), 450);
    });

    test('and the milk run has no kitchen collection on logistics', () {
      ServiceProfile.setActive(ServiceProfile.parcel);
      expect(ServiceProfile.active.sourceIsKitchen, isFalse);
      expect(ServiceProfile.active.bulkLoadProof, isFalse);
    });
  });

  group('the backend dependencies are declared, not hidden', () {
    test('the quoted price has nowhere to be recorded, and says so', () {
      expect(
        MilerApi.missingFromBackend.any((g) => g.contains('quoted price')),
        isTrue,
      );
    });

    test('the delivery OTP cannot be verified, and says so', () {
      expect(
        MilerApi.missingFromBackend.any((g) => g.contains('delivery OTP')),
        isTrue,
      );
    });
  });
}