import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:material_symbols_icons/symbols.dart';
import 'package:ikar/frontend/screens/chats/chat/view/scroll_down_button.dart';

void main() {
  Future<void> pumpButton(
    WidgetTester tester,
    ValueNotifier<int> unread, {
    VoidCallback? onTap,
    bool material = false,
    double visibility = 1,
  }) async {
    final height = ValueNotifier<double>(64);
    addTearDown(height.dispose);
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          body: Stack(
            children: [
              ScrollDownButton(
                composerHeight: height,
                materialComposer: material,
                composerUnderlap: true,
                frosted: false,
                liquidChrome: false,
                pillBackdrop: null,
                scrollDownCurved: AlwaysStoppedAnimation(visibility),
                unreadCount: unread,
                onTap: onTap ?? () {},
              ),
            ],
          ),
        ),
      ),
    );
  }

  for (final material in [false, true]) {
    testWidgets('existing unread count updates while the arrow is visible '
        '(material=$material)', (tester) async {
      final unread = ValueNotifier(12);
      addTearDown(unread.dispose);
      await pumpButton(tester, unread, material: material);
      expect(find.text('12'), findsOneWidget);
      unread.value = 5;
      await tester.pumpAndSettle();
      expect(find.text('5'), findsOneWidget);
      expect(find.text('12'), findsNothing);
      unread.value = 0;
      await tester.pumpAndSettle();
      expect(find.text('5'), findsNothing);
      expect(find.byIcon(Symbols.keyboard_arrow_down), findsOneWidget);
      expect(tester.takeException(), isNull);
    });
  }

  testWidgets('large counts are capped and tapping waits for actual reading', (
    tester,
  ) async {
    final unread = ValueNotifier(150);
    addTearDown(unread.dispose);
    var taps = 0;
    await pumpButton(tester, unread, onTap: () => taps++);
    expect(find.text('99+'), findsOneWidget);
    await tester.tap(find.byIcon(Symbols.keyboard_arrow_down));
    await tester.pumpAndSettle();
    expect(taps, 1);
    expect(find.text('99+'), findsOneWidget);
    unread.value = 0;
    await tester.pumpAndSettle();
    expect(find.text('99+'), findsNothing);
  });

  testWidgets('hidden arrow also hides its badge', (tester) async {
    final unread = ValueNotifier(8);
    addTearDown(unread.dispose);
    await pumpButton(tester, unread, visibility: 0);
    expect(find.text('8'), findsNothing);
    expect(find.byIcon(Symbols.keyboard_arrow_down), findsNothing);
  });
}