import 'package:flutter_test/flutter_test.dart';
import 'package:miler/data/assignment_lookup.dart';

/// Rows shaped like GET /miler/assignments (models.BookingAssignment), which the
/// backend returns ordered by assignedat DESC.
Map<String, dynamic> row(
  int assignmentId,
  dynamic bookingId,
  String status,
) =>
    <String, dynamic>{
      'bookingassignmentid': assignmentId,
      'bookingid': bookingId,
      'mileruserid': 42,
      'assignmentstatus': status,
    };

void main() {
  group('AssignmentLookup.buildIndex', () {
    test('maps bookingid to bookingassignmentid, not to itself', () {
      final index = AssignmentLookup.buildIndex([row(9001, 5, 'Assigned')]);

      // The whole point: booking 5 must resolve to assignment 9001. Returning
      // the booking id here is the 404 bug this class exists to prevent.
      expect(index['5'], 9001);
    });

    test('keeps the newest row when a booking has only terminal history', () {
      // assignedat DESC — newest first.
      final index = AssignmentLookup.buildIndex([
        row(9003, 7, 'Rejected'),
        row(9002, 7, 'Cancelled'),
      ]);

      expect(index['7'], 9003);
    });

    test('prefers a live assignment over a newer terminal one', () {
      // Reassignment history: the Rejected row is newer, but the rider must act
      // on the still-live Assigned row.
      final index = AssignmentLookup.buildIndex([
        row(9010, 8, 'Rejected'),
        row(9009, 8, 'Assigned'),
      ]);

      expect(index['8'], 9009);
    });

    test('does not let a later terminal row displace a live one', () {
      final index = AssignmentLookup.buildIndex([
        row(9020, 9, 'Assigned'),
        row(9019, 9, 'Rejected'),
      ]);

      expect(index['9'], 9020);
    });

    test('treats Accepted as live so re-accept resolves the same assignment',
        () {
      final index = AssignmentLookup.buildIndex([
        row(9031, 11, 'Cancelled'),
        row(9030, 11, 'Accepted'),
      ]);

      expect(index['11'], 9030);
    });

    test('normalises int and string booking ids to the same key', () {
      final index = AssignmentLookup.buildIndex([
        row(9040, 12, 'Assigned'),
        row(9041, '13', 'Assigned'),
      ]);

      expect(index['12'], 9040);
      expect(index['13'], 9041);
    });

    test('coerces a string assignment id to int', () {
      final index = AssignmentLookup.buildIndex([
        <String, dynamic>{
          'bookingassignmentid': '9050',
          'bookingid': 14,
          'assignmentstatus': 'Assigned',
        }
      ]);

      expect(index['14'], 9050);
    });

    test('skips rows missing either id rather than mapping them to garbage', () {
      final index = AssignmentLookup.buildIndex([
        <String, dynamic>{'bookingid': 15, 'assignmentstatus': 'Assigned'},
        <String, dynamic>{
          'bookingassignmentid': 9060,
          'assignmentstatus': 'Assigned'
        },
        <String, dynamic>{
          'bookingassignmentid': null,
          'bookingid': null,
          'assignmentstatus': 'Assigned'
        },
      ]);

      expect(index, isEmpty);
    });

    test('ignores non-map entries', () {
      final index = AssignmentLookup.buildIndex([
        'nonsense',
        42,
        null,
        row(9070, 16, 'Assigned'),
      ]);

      expect(index, {'16': 9070});
    });

    test('handles an empty list', () {
      expect(AssignmentLookup.buildIndex([]), isEmpty);
    });
  });
}