MO-Fuel-Tax-Back/test/fuel_report_test.dart

import 'package:flutter_test/flutter_test.dart';
import 'package:fuel_tax_tracker/models/fuel_entry.dart';
import 'package:fuel_tax_tracker/models/vehicle.dart';
import 'package:fuel_tax_tracker/services/fuel_report.dart';

void main() {
  final truck = Vehicle(
    id: 'v1',
    vin: '1FMPU18L1TLB51349',
    nickname: 'Truck',
    updatedAt: DateTime.utc(2026, 1, 1),
  );
  final car = Vehicle(
    id: 'v2',
    vin: '1GNWK5EG4DR302326',
    updatedAt: DateTime.utc(2026, 1, 1),
  );

  FuelEntry entry({
    required String id,
    required String vehicleId,
    required DateTime date,
    double gallons = 10,
    double totalCost = 35,
    String? receiptImagePath,
    String? receiptDriveFileId,
  }) =>
      FuelEntry(
        id: id,
        vehicleId: vehicleId,
        date: date,
        gallons: gallons,
        pricePerGallon: totalCost / gallons,
        totalCost: totalCost,
        updatedAt: date,
        receiptImagePath: receiptImagePath,
        receiptDriveFileId: receiptDriveFileId,
      );

  test('sums gallons and cost per vehicle, only for entries with a receipt', () {
    final report = buildFuelReport(
      vehicles: [truck, car],
      fuelEntries: [
        entry(
            id: 'e1',
            vehicleId: 'v1',
            date: DateTime(2026, 3, 5),
            gallons: 10,
            totalCost: 35,
            receiptImagePath: '/local/a.jpg'),
        entry(
            id: 'e2',
            vehicleId: 'v1',
            date: DateTime(2026, 3, 20),
            gallons: 12,
            totalCost: 42,
            receiptDriveFileId: 'remote-1'),
        // No receipt at all — should be excluded even though it's in range.
        entry(id: 'e3', vehicleId: 'v1', date: DateTime(2026, 3, 10), gallons: 99, totalCost: 999),
      ],
      startDate: DateTime(2026, 3, 1),
      endDate: DateTime(2026, 3, 31),
    );

    expect(report.rows, hasLength(1));
    expect(report.rows.single.vehicle.id, 'v1');
    expect(report.rows.single.entryCount, 2);
    expect(report.rows.single.totalGallons, 22);
    expect(report.rows.single.totalCost, 77);
  });

  test('date range is inclusive of both endpoints', () {
    final report = buildFuelReport(
      vehicles: [truck],
      fuelEntries: [
        entry(
            id: 'first-day',
            vehicleId: 'v1',
            date: DateTime(2026, 3, 1),
            receiptImagePath: '/a.jpg'),
        entry(
            id: 'last-day',
            vehicleId: 'v1',
            date: DateTime(2026, 3, 31),
            receiptImagePath: '/b.jpg'),
        entry(
            id: 'day-after',
            vehicleId: 'v1',
            date: DateTime(2026, 4, 1),
            receiptImagePath: '/c.jpg'),
      ],
      startDate: DateTime(2026, 3, 1),
      endDate: DateTime(2026, 3, 31),
    );

    expect(report.rows.single.entryCount, 2);
  });

  test('a receipt-photo time-of-day does not push it out of range', () {
    final report = buildFuelReport(
      vehicles: [truck],
      fuelEntries: [
        entry(
          id: 'late-in-day',
          vehicleId: 'v1',
          date: DateTime(2026, 3, 31, 23, 59),
          receiptImagePath: '/a.jpg',
        ),
      ],
      startDate: DateTime(2026, 3, 1),
      endDate: DateTime(2026, 3, 31),
    );

    expect(report.rows.single.entryCount, 1);
  });

  test('omits vehicles with no qualifying entries rather than a zero row', () {
    final report = buildFuelReport(
      vehicles: [truck, car],
      fuelEntries: [
        entry(id: 'e1', vehicleId: 'v1', date: DateTime(2026, 3, 5), receiptImagePath: '/a.jpg'),
      ],
      startDate: DateTime(2026, 3, 1),
      endDate: DateTime(2026, 3, 31),
    );

    expect(report.rows, hasLength(1));
    expect(report.rows.single.vehicle.id, 'v1');
  });

  test('rows are sorted by vehicle display label', () {
    final zVehicle = Vehicle(
      id: 'v3',
      vin: 'ZZZ00000000000000',
      nickname: 'Zeta',
      updatedAt: DateTime.utc(2026, 1, 1),
    );
    final aVehicle = Vehicle(
      id: 'v4',
      vin: 'AAA00000000000000',
      nickname: 'Alpha',
      updatedAt: DateTime.utc(2026, 1, 1),
    );

    final report = buildFuelReport(
      vehicles: [zVehicle, aVehicle],
      fuelEntries: [
        entry(id: 'e1', vehicleId: 'v3', date: DateTime(2026, 3, 5), receiptImagePath: '/a.jpg'),
        entry(id: 'e2', vehicleId: 'v4', date: DateTime(2026, 3, 5), receiptImagePath: '/b.jpg'),
      ],
      startDate: DateTime(2026, 3, 1),
      endDate: DateTime(2026, 3, 31),
    );

    expect(report.rows.map((r) => r.vehicle.id), ['v4', 'v3']);
  });

  test('report totals sum across all vehicle rows', () {
    final report = buildFuelReport(
      vehicles: [truck, car],
      fuelEntries: [
        entry(
            id: 'e1',
            vehicleId: 'v1',
            date: DateTime(2026, 3, 5),
            gallons: 10,
            totalCost: 35,
            receiptImagePath: '/a.jpg'),
        entry(
            id: 'e2',
            vehicleId: 'v2',
            date: DateTime(2026, 3, 6),
            gallons: 8,
            totalCost: 28,
            receiptImagePath: '/b.jpg'),
      ],
      startDate: DateTime(2026, 3, 1),
      endDate: DateTime(2026, 3, 31),
    );

    expect(report.totalGallons, 18);
    expect(report.totalCost, 63);
  });
}