import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:miler/views/Dashboard/home/route_brief.dart';

void main() {
  // Two stops roughly 2.5 km and 3.5 km from a Coimbatore origin.
  final stops = <String, Map<String, dynamic>>{
    'A': {
      'Quantity': '3',
      'weight': '4.5',
      'collectionamt': '250',
      'pickuplat': '11.0243',
      'pickuplon': '76.9558',
      'kms': '2.1',
    },
    'B': {
      'Quantity': '8',
      'weight': '2',
      'collectionamt': '0',
      'pickuplat': '11.0312',
      'pickuplon': '76.9678',
      'kms': '1.5',
    },
  };

  group('RouteBrief load & capacity', () {
    test('sums parcels, weight and cash across the route', () {
      final brief = RouteBrief.from(
        orderIds: const ['A', 'B'],
        ordersMap: stops,
        shiftStart: '09:00:00',
        shiftEnd: '18:00:00',
      );

      expect(brief.stops, 2);
      expect(brief.parcels, 11);
      expect(brief.weightKg, 6.5);
      expect(brief.collectAmount, 250);
    });

    test('counts accepted stops that already left the pending list', () {
      final brief = RouteBrief.from(
        orderIds: const ['A'],
        ordersMap: stops,
        shiftStart: '',
        shiftEnd: '',
        extraStops: [stops['B']!],
      );

      // Same totals as if both were still pending — an accepted stop is still
      // a stop the rider has to ride to.
      expect(brief.stops, 2);
      expect(brief.parcels, 11);
      expect(brief.weightKg, 6.5);
    });

    test('strips units baked into numeric strings', () {
      final brief = RouteBrief.from(
        orderIds: const ['A'],
        ordersMap: {
          'A': {'Quantity': '2', 'weight': '3.25 kg', 'collectionamt': '₹180'},
        },
        shiftStart: '',
        shiftEnd: '',
      );

      expect(brief.weightKg, 3.25);
      expect(brief.collectAmount, 180);
    });
  });

  group('RouteBrief round-trip distance', () {
    test('closes the loop back to the origin', () {
      final withOrigin = RouteBrief.from(
        orderIds: const ['A', 'B'],
        ordersMap: stops,
        shiftStart: '',
        shiftEnd: '',
        riderLat: 11.0180,
        riderLng: 76.9580,
      );
      final withoutOrigin = RouteBrief.from(
        orderIds: const ['A', 'B'],
        ordersMap: stops,
        shiftStart: '',
        shiftEnd: '',
      );

      // Origin → A → B → origin must be longer than the bare A → B leg.
      expect(withOrigin.routeKm, greaterThan(withoutOrigin.routeKm));
      expect(withOrigin.routeKm, greaterThan(4));
      expect(withOrigin.routeKm, lessThan(15));
    });

    test('falls back to the per-stop kms field when coordinates are missing',
        () {
      final brief = RouteBrief.from(
        orderIds: const ['A'],
        ordersMap: {
          'A': {'Quantity': '1', 'kms': '4.2'},
        },
        shiftStart: '',
        shiftEnd: '',
      );

      expect(brief.routeKm, 4.2);
    });
  });

  group('RouteBrief shift window', () {
    test('flags a missing shift', () {
      final brief = RouteBrief.from(
        orderIds: const [],
        ordersMap: const {},
        shiftStart: '',
        shiftEnd: '',
      );

      expect(brief.shiftSet, isFalse);
      expect(brief.timeLeft, isNull);
      expect(brief.shiftWindowLabel, 'Shift not set');
    });

    test('flags a half-set shift as not set', () {
      final brief = RouteBrief.from(
        orderIds: const [],
        ordersMap: const {},
        shiftStart: '09:00:00',
        shiftEnd: '',
      );

      expect(brief.shiftSet, isFalse);
    });

    test('computes time left and a per-stop budget', () {
      final now = DateTime(2026, 7, 27, 15, 0);
      final brief = RouteBrief.from(
        orderIds: const ['A', 'B'],
        ordersMap: stops,
        shiftStart: '09:00:00',
        shiftEnd: '18:00:00',
        now: now,
      );

      expect(brief.shiftSet, isTrue);
      expect(brief.timeLeft, const Duration(hours: 3));
      expect(brief.perStopBudget, const Duration(minutes: 90));
      expect(brief.isPaceAtRisk, isFalse);
      expect(brief.shiftWindowLabel, '9:00 AM – 6:00 PM');
    });

    test('clamps a finished shift to zero instead of going negative', () {
      final brief = RouteBrief.from(
        orderIds: const [],
        ordersMap: const {},
        shiftStart: '09:00:00',
        shiftEnd: '18:00:00',
        now: DateTime(2026, 7, 27, 20, 0),
      );

      expect(brief.timeLeft, Duration.zero);
      expect(brief.perStopBudget, isNull);
    });

    test('rolls an overnight shift end into the next day', () {
      final brief = RouteBrief.from(
        orderIds: const [],
        ordersMap: const {},
        shiftStart: '22:00:00',
        shiftEnd: '06:00:00',
        now: DateTime(2026, 7, 27, 23, 0),
      );

      expect(brief.timeLeft, const Duration(hours: 7));
    });

    test('raises the pace flag when stops cannot fit in the time left', () {
      final brief = RouteBrief.from(
        orderIds: const ['A', 'B'],
        ordersMap: stops,
        shiftStart: '09:00:00',
        shiftEnd: '18:00:00',
        now: DateTime(2026, 7, 27, 17, 51), // 9 minutes for 2 stops
      );

      expect(brief.isPaceAtRisk, isTrue);
    });

    test('parses 12-hour shift strings', () {
      final brief = RouteBrief.from(
        orderIds: const [],
        ordersMap: const {},
        shiftStart: '9:30 AM',
        shiftEnd: '6:00 PM',
        now: DateTime(2026, 7, 27, 12, 0),
      );

      expect(brief.shiftSet, isTrue);
      expect(brief.timeLeft, const Duration(hours: 6));
    });
  });

  /// A missing shift is somebody else's admin: the rider cannot fix it, did not
  /// cause it, and is not blocked by it — the trips still load and he can still
  /// ride them. So the banner says nothing at all rather than parking a
  /// permanent amber "No shift set for today" box at the top of his first
  /// screen. These tests keep it that way, because a box like that comes back
  /// easily and always with good intentions.
  group('ShiftBanner', () {
    Future<void> pump(WidgetTester tester, RouteBrief brief) async {
      await tester.pumpWidget(
        ScreenUtilInit(
          designSize: const Size(390, 844),
          builder: (_, _) => MaterialApp(
            home: Scaffold(body: ShiftBanner(brief: brief)),
          ),
        ),
      );
      await tester.pumpAndSettle();
    }

    testWidgets('renders nothing at all when no shift is set', (tester) async {
      await pump(
        tester,
        RouteBrief.from(
          orderIds: const ['A', 'B'],
          ordersMap: stops,
          shiftStart: '',
          shiftEnd: '',
        ),
      );

      expect(tester.takeException(), isNull);
      expect(find.text('No shift set for today'), findsNothing);
      expect(find.text('Retry'), findsNothing);
      expect(find.textContaining('hub manager'), findsNothing);

      // Not merely empty of those strings — the widget takes no height, so the
      // route below it starts at the top of the page.
      expect(tester.getSize(find.byType(ShiftBanner)).height, 0);
    });

    testWidgets('still shows the window once the hub sets one', (tester) async {
      await pump(
        tester,
        RouteBrief.from(
          orderIds: const ['A', 'B'],
          ordersMap: stops,
          shiftStart: '09:00:00',
          shiftEnd: '18:00:00',
          now: DateTime(2026, 7, 27, 15, 0),
        ),
      );

      expect(tester.takeException(), isNull);
      expect(find.text('3h left'), findsOneWidget);
      expect(tester.getSize(find.byType(ShiftBanner)).height, greaterThan(0));
    });
  });

  group('RouteBrief time windows', () {
    final now = DateTime(2026, 7, 27, 15, 0);

    test('counts stops past their slot and stops closing soon', () {
      final brief = RouteBrief.from(
        orderIds: const ['late', 'soon', 'later'],
        ordersMap: {
          'late': {
            'expected_pickup_time':
                now.subtract(const Duration(minutes: 20)).toIso8601String(),
          },
          'soon': {
            'expected_pickup_time':
                now.add(const Duration(minutes: 10)).toIso8601String(),
          },
          'later': {
            'expected_pickup_time':
                now.add(const Duration(hours: 3)).toIso8601String(),
          },
        },
        shiftStart: '09:00:00',
        shiftEnd: '18:00:00',
        now: now,
      );

      expect(brief.overdueStops, 1);
      expect(brief.dueSoonStops, 1);
    });

    test('ignores stops with no slot time', () {
      final brief = RouteBrief.from(
        orderIds: const ['A', 'B'],
        ordersMap: stops,
        shiftStart: '09:00:00',
        shiftEnd: '18:00:00',
        now: now,
      );

      expect(brief.overdueStops, 0);
      expect(brief.dueSoonStops, 0);
    });
  });

  group('formatDuration', () {
    test('reads like a clock', () {
      expect(formatDuration(const Duration(minutes: 45)), '45m');
      expect(formatDuration(const Duration(hours: 2, minutes: 15)), '2h 15m');
      expect(formatDuration(const Duration(hours: 3)), '3h');
      expect(formatDuration(const Duration(seconds: 20)), 'under a minute');
    });
  });
}