import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:nuvolari/core/region/region_config.dart';
import 'package:nuvolari/core/region/region_repository.dart';
import 'package:nuvolari/features/sources/sources_screen.dart';
import 'package:nuvolari/l10n/app_localizations.dart';

RegionConfig loadPiemonte() =>
    RegionConfig.parse(File('assets/regions/piemonte.json').readAsStringSync());

Widget wrap(Widget child, RegionConfig region) => ProviderScope(
  overrides: [regionConfigProvider.overrideWith((ref) async => region)],
  child: MaterialApp(
    locale: const Locale('it'),
    localizationsDelegates: AppLocalizations.localizationsDelegates,
    supportedLocales: AppLocalizations.supportedLocales,
    home: child,
  ),
);

void main() {
  late RegionConfig region;

  setUpAll(() {
    region = loadPiemonte();
  });

  group('SourcesScreen', () {
    testWidgets('lists every configured source with its licence', (
      tester,
    ) async {
      await tester.pumpWidget(wrap(const SourcesScreen(), region));
      await tester.pumpAndSettle();

      // The list is longer than the test viewport, so each entry is scrolled to
      // rather than expected to be on screen at once. Asserting only on what
      // happens to fit would let a credit fall off the bottom unnoticed.
      for (final attribution in region.attributions) {
        await tester.scrollUntilVisible(
          find.text(attribution.text),
          200,
          scrollable: find.byType(Scrollable).first,
        );
        await tester.pumpAndSettle();
        expect(
          find.text(attribution.text),
          findsOneWidget,
          reason: '${attribution.id} is missing from the Sources screen',
        );

        // Assert the licence while its row is on screen. Checking at the end
        // would only prove whatever the last scroll happened to leave visible.
        final license = attribution.license;
        expect(
          find.text(
            license == null
                ? 'Nessuna licenza dichiarata dalla fonte'
                : 'Licenza: $license',
          ),
          findsWidgets,
          reason: 'the licence for ${attribution.id} is not shown beside it',
        );
      }
    });

    // ARPA publishes no licence for the alert bulletin. Showing an invented one
    // would be worse than showing none, so the screen must say so explicitly.
    testWidgets('says when a source states no licence', (tester) async {
      await tester.pumpWidget(wrap(const SourcesScreen(), region));
      await tester.pumpAndSettle();

      expect(find.text('Nessuna licenza dichiarata dalla fonte'), findsWidgets);
    });

    testWidgets('shows the independence disclaimer', (tester) async {
      await tester.pumpWidget(wrap(const SourcesScreen(), region));
      await tester.pumpAndSettle();

      expect(find.text('App non ufficiale'), findsOneWidget);
      expect(find.textContaining('indipendente'), findsOneWidget);
    });

    testWidgets('explains the share-alike obligation', (tester) async {
      await tester.pumpWidget(wrap(const SourcesScreen(), region));
      await tester.pumpAndSettle();

      // Below the fold in the test viewport once the base-map credits are listed.
      await tester.scrollUntilVisible(
        find.text('Dati derivati'),
        200,
        scrollable: find.byType(Scrollable).first,
      );
      await tester.pumpAndSettle();

      expect(find.text('Dati derivati'), findsOneWidget);
      expect(find.textContaining('CC BY-SA'), findsWidgets);
    });

    testWidgets('links the official bulletin', (tester) async {
      await tester.pumpWidget(wrap(const SourcesScreen(), region));
      await tester.pumpAndSettle();

      // The button sits below the fold in the test viewport.
      await tester.scrollUntilVisible(
        find.text('Bollettino ufficiale Arpa Piemonte'),
        200,
        scrollable: find.byType(Scrollable).first,
      );
      await tester.pumpAndSettle();

      expect(find.text('Bollettino ufficiale Arpa Piemonte'), findsOneWidget);
    });
  });
}