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

import 'package:doormile_cx/data/dev_doormile_api.dart';
import 'package:doormile_cx/data/doormile_api.dart';
import 'package:doormile_cx/data/models.dart';
import 'package:doormile_cx/state/app_scope.dart';
import 'package:doormile_cx/state/app_state.dart';
import 'package:doormile_cx/ui/screens/booking/send_screen.dart';

/// ─────────────────────────────────────────────────────────────────────────
/// SENDING A SECOND PARCEL
///
/// One booking carries one destination while the server caps it there, so a
/// customer with two parcels for two places books twice. What that used to
/// cost them was the whole flow twice — confirm, walk back to Home, re-answer
/// the door they had not moved from, the window, everything.
///
/// [AppState.startBookingFrom] is what makes the second one short. These pin
/// what it carries and, more importantly, what it refuses to.
/// ─────────────────────────────────────────────────────────────────────────
void main() {
  late AppState app;
  late Booking previous;

  setUp(() async {
    DoormileApi.overrideInstance(DevDoormileApi());
    app = AppState()
      ..customer = const Customer(
        id: 'c1',
        name: 'Joe Oommen',
        phone: '+91 98765 43210',
        email: 'joe@example.com',
      );
    await app.refreshOrders();
    previous = app.orders.first;
  });

  tearDown(() => DoormileApi.overrideInstance(null));

  group('what a repeat carries', () {
    test('the door, always', () {
      app.startBookingFrom(previous);
      expect(app.draftPickup?.title, previous.pickup.title);
      expect(app.draftPickup?.lat, previous.pickup.lat);
      expect(app.draftPickup?.lng, previous.pickup.lng);
    });

    test('the destination only when asked', () {
      // "Send another from here" — same door, new route.
      app.startBookingFrom(previous);
      expect(
        app.draftDestinations.first.destination.districtCode,
        isNull,
        reason: 'the customer is choosing somewhere new',
      );

      // "Send another like this" — same door, same route.
      app.startBookingFrom(previous, keepDestinations: true);
      expect(
        app.draftDestinations.first.destination.districtCode,
        previous.destinations.first.destination.districtCode,
      );
      expect(
        app.draftDestinations.first.packageCount,
        previous.destinations.first.packageCount,
      );
    });

    test('never the window', () {
      // ── The one field a repeat must not assume ──
      //
      // A slot fills up. Pinning the second booking to the first one's window
      // would be refused at confirm with nothing the customer could act on —
      // and it is a genuinely fresh decision anyway: the first parcel going at
      // 2pm says nothing about when they want the next visit.
      expect(previous.slotId, isNotEmpty);
      app.startBookingFrom(previous, keepDestinations: true);
      expect(app.draftSlotId, isNull);
    });

    test('a copy, not the booking itself', () {
      app.startBookingFrom(previous, keepDestinations: true);
      app.draftDestinations.first.packageCount = 9;

      expect(
        previous.destinations.first.packageCount,
        isNot(9),
        reason: 'editing the draft must not rewrite the order it came from',
      );
    });
  });

  group('the cap is obeyed', () {
    test('a repeat never carries more destinations than the server allows', () {
      final many = Booking(
        reference: 'DM-999999',
        pickup: previous.pickup,
        destinations: [
          for (var i = 0; i < 5; i++)
            DestinationGroup(
              destination: Destination(
                stateCode: 'TN',
                districtCode: 'TN-$i',
                stateName: 'Tamil Nadu',
                districtName: 'District $i',
              ),
            ),
        ],
        slotId: previous.slotId,
        createdAt: DateTime.now(),
      );

      app.startBookingFrom(many, keepDestinations: true);
      expect(
        app.draftDestinations.length,
        lessThanOrEqualTo(app.limits.maxDestinations),
      );
    });
  });


  group('the one-destination cap explains itself', () {
    /// Review with a draft on it, at whatever cap the server is advertising.
    Future<void> pumpReview(WidgetTester tester, {required int cap}) async {
      tester.view.physicalSize = const Size(1230, 9000);
      tester.view.devicePixelRatio = 3.0;
      addTearDown(tester.view.reset);

      app.limits = BookingLimits(maxPackages: 20, maxDestinations: cap);
      app.startBookingFrom(previous, keepDestinations: true);

      await tester.pumpWidget(
        AppScope(state: app, child: const MaterialApp(home: SendScreen())),
      );
      for (var i = 0; i < 6; i++) {
        await tester.pump(const Duration(milliseconds: 120));
      }
    }

    testWidgets('says so when the server allows one', (tester) async {
      // ── Why this needs a test at all ──
      //
      // The dev backend advertises five, so this line never renders in the
      // screenshots or anywhere else a person would look. Production
      // advertises one. A conditional nobody exercises is a conditional that
      // quietly never fires.
      await pumpReview(tester, cap: 1);
      expect(find.textContaining('One destination per pickup'), findsOneWidget);
    });

    testWidgets('stays quiet when it allows more', (tester) async {
      await pumpReview(tester, cap: 5);
      expect(find.textContaining('One destination per pickup'), findsNothing);
    });
  });
}