import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

class DemoPage extends StatelessWidget {
  const DemoPage({super.key});

  @override
  Widget build(BuildContext context) {
    return BlocProvider(
      create: (ctx) => DependentCounterCubit(),
      child: const Scaffold(
        body: DemoView(),
      ),
    );
  }
}

class DemoView extends StatelessWidget {
  const DemoView({super.key});

  @override
  Widget build(BuildContext context) {
    print('DemoView build, $hashCode');
    final state = context.watch<DependentCounterCubit>().state;
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          const CounterText1(),
          CounterText2('${state.counterTwo}'),
          const SizedBox.square(dimension: 20),
          FilledButton(
            onPressed: context.read<DependentCounterCubit>().incrementOne,
            child: const Text('Increment One'),
          ),
          FilledButton(
            onPressed: context.read<DependentCounterCubit>().incrementTwo,
            child: const Text('Increment Two'),
          ),
        ],
      ),
    );
  }
}

// This class is only created for tagging it in the Widget Performance view
class CounterText1 extends StatelessWidget {
  const CounterText1({super.key});

  @override
  Widget build(BuildContext context) {
    print('CounterText1 build, $hashCode');
    final counterText = context.select(
      (DependentCounterCubit c) => c.state.counterOne,
    );

    return Text(
      'Text1: $counterText',
      style: Theme.of(context).textTheme.titleLarge,
    );
  }
}

// This class is only created for tagging it in the Widget Performance view
class CounterText2 extends StatelessWidget {
  const CounterText2(this._text, {super.key});

  final String _text;

  @override
  Widget build(BuildContext context) {
    print('CounterText2 build, $hashCode');
    return Text(
      'Text2: $_text',
      style: Theme.of(context).textTheme.titleLarge,
    );
  }
}

// CUBIT SAMPLE
typedef DependentCounterState = ({int counterOne, int counterTwo});

class DependentCounterCubit extends Cubit<DependentCounterState> {
  DependentCounterCubit() : super((counterOne: 0, counterTwo: 0));

  void incrementOne() {
    emit((counterOne: state.counterOne + 1, counterTwo: state.counterTwo));
  }

  void incrementTwo() {
    emit((counterOne: state.counterOne, counterTwo: state.counterTwo + 1));
  }
}