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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Startup Name Generator',
      home: RandomWords()
    );
  }
}

class RandomWordsState extends State<RandomWords> {
  final List<WordPair> _suggestions = <WordPair>[];
  final Set<WordPair> _saved = new Set<WordPair>();
  final _biggerFont = const TextStyle(fontSize: 18.0);

  Widget _buildSuggestions() {
    return ListView.builder(
      padding: const EdgeInsets.all(22.0),
      itemBuilder: (context, i) {
        if (i.isOdd) return Divider();

        final index = i ~/ 2;
        if (index >= _suggestions.length) {
          _suggestions.addAll(generateWordPairs().take(10));
        }

        return _buildRow(_suggestions[index]);
      },
    );
  }

  Widget _buildRow(WordPair wordPair) {
    final bool alreadySaved = _saved.contains(wordPair);

    return ListTile(
      title: Text(
        wordPair.asPascalCase,
        style: _biggerFont
      ),
      trailing: new Icon(
        alreadySaved ? Icons.favorite : Icons.favorite_border,
        color: alreadySaved ? Colors.red : null
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Startup Name Generator'),
      ),
      body:_buildSuggestions()
    );
  }
}

class RandomWords extends StatefulWidget {
  @override
  RandomWordsState createState() => new RandomWordsState();
}