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

import 'package:fuel_tax_tracker/models/fuel_entry.dart';
import 'package:fuel_tax_tracker/models/vehicle.dart';
import 'package:fuel_tax_tracker/screens/edit_fuel_entry_screen.dart';
import 'package:fuel_tax_tracker/screens/receipt_detail_screen.dart';
import 'package:fuel_tax_tracker/screens/receipt_image_screen.dart';
import 'package:fuel_tax_tracker/services/app_state.dart';

/// Covers [ReceiptDetailScreen] itself — the single place to view a
/// receipt's photo and logged data together, with edit/delete for the
/// entry. Deliberately never taps through to an actual delete: that would
/// call [AppState.deleteFuelEntry], which needs an initialized database not
/// set up here (see settings_purge_test.dart for the same convention).
void main() {
  final vehicle = Vehicle(id: 'v1', vin: '1FMPU18L1TLB51349', nickname: 'Red Truck', updatedAt: DateTime.utc(2026, 1, 1));
  final entry = FuelEntry(
    id: 'e1',
    vehicleId: 'v1',
    date: DateTime(2026, 5, 14, 9, 30),
    gallons: 10.523,
    pricePerGallon: 3.499,
    totalCost: 36.81,
    updatedAt: DateTime.utc(2026, 5, 14),
    receiptDriveFileId: 'remote-1',
  );

  Future<void> pumpDetail(WidgetTester tester, AppState appState) async {
    await tester.pumpWidget(
      ChangeNotifierProvider.value(
        value: appState,
        child: MaterialApp(home: ReceiptDetailScreen(entryId: 'e1')),
      ),
    );
  }

  testWidgets('shows the vehicle, date, gallons, price, and total', (tester) async {
    final appState = AppState()
      ..isLoading = false
      ..vehicles = [vehicle]
      ..fuelEntries = [entry];

    await pumpDetail(tester, appState);

    expect(find.text('Red Truck'), findsOneWidget);
    expect(find.text('VIN: 1FMPU18L1TLB51349'), findsOneWidget);
    expect(find.text('10.523 gal'), findsOneWidget);
    expect(find.text('\$3.50'), findsOneWidget, reason: 'price per gallon');
    expect(find.text('\$36.81'), findsOneWidget, reason: 'total cost');
  });

  testWidgets('shows a fallback instead of crashing when the entry no longer exists',
      (tester) async {
    final appState = AppState()
      ..isLoading = false
      ..vehicles = [vehicle]
      ..fuelEntries = [];

    await pumpDetail(tester, appState);

    expect(find.text('Receipt not found'), findsOneWidget);
  });

  testWidgets('the edit icon opens EditFuelEntryScreen pre-filled', (tester) async {
    final appState = AppState()
      ..isLoading = false
      ..vehicles = [vehicle]
      ..fuelEntries = [entry];

    await pumpDetail(tester, appState);

    await tester.tap(find.byTooltip('Edit fuel entry'));
    await tester.pumpAndSettle();

    expect(find.byType(EditFuelEntryScreen), findsOneWidget);
    expect(find.widgetWithText(TextFormField, '10.523'), findsOneWidget);
  });

  testWidgets('the delete icon shows a warning dialog; Cancel dismisses it without deleting',
      (tester) async {
    final appState = AppState()
      ..isLoading = false
      ..vehicles = [vehicle]
      ..fuelEntries = [entry];

    await pumpDetail(tester, appState);

    await tester.tap(find.byTooltip('Delete fuel entry'));
    await tester.pumpAndSettle();

    expect(find.text('Delete fuel entry?'), findsOneWidget);

    await tester.tap(find.text('Cancel'));
    await tester.pumpAndSettle();

    expect(find.text('Delete fuel entry?'), findsNothing);
    expect(appState.fuelEntries, hasLength(1), reason: 'not deleted');
  });

  testWidgets('tapping the photo opens the full-screen viewer', (tester) async {
    final appState = AppState()
      ..isLoading = false
      ..vehicles = [vehicle]
      ..fuelEntries = [entry];

    await pumpDetail(tester, appState);

    await tester.tap(find.byType(GestureDetector).first);
    await tester.pumpAndSettle();

    expect(find.byType(ReceiptImageScreen), findsOneWidget);
  });
}