// ==========================================================================================
// QUIZ.DART:
// ------------------------------------------------------------------------------------------

import 'package:flutter/material.dart';
import 'package:quiz/question.dart';

import 'answer.dart';

class Quiz extends StatelessWidget {

  final List<Map<String, Object>> questions;
  final int questionIndex;
  final Function answerQuestion;

  Quiz({
    @required this.questions,
    @required this.answerQuestion,
    @required this.questionIndex,
  });

  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        Question(
          questions[questionIndex]['questionText']
        ),
        ...(questions[questionIndex]['answers'] as List<Map<String, Object>>).map((answer){
          return Answer(() => answerQuestion(answer['score']), answer['text']);
        }).toList()
      ],
    );
  }
}


// ==========================================================================================
// MAIN.DART:
// ------------------------------------------------------------------------------------------


import 'package:flutter/material.dart';
import 'package:quiz/quiz.dart';
import 'package:quiz/result.dart';


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


class MyApp extends StatefulWidget {

  @override
  State<StatefulWidget> createState() {
    return _MyAppState();
  }

}

class _MyAppState extends State<MyApp> {

  var _questionIndex = 0;
  var _totalScore = 0;

  final _questions = [
    {
      'questionText': 'What\'s your favorite color?',
        'answers': [
          {'text': 'Red', 'scrore': 1},
          {'text': 'Green', 'scrore': 2},
          {'text': 'Blue', 'scrore': 3},
          {'text': 'Black', 'scrore': 4},
        ]
    },
    {
      'questionText': 'What\'s your favorite animal?',
      'answers': [
        {'text': 'Cat', 'score': 1},
        {'text': 'Dog', 'score': 2},
        {'text': 'Horse', 'score': 3}
      ]
    }
  ];

  void _answerQuestion(int score){

    _totalScore += score;

    setState(() {
      _questionIndex += 1;
    });

    print(_questionIndex);
  }

  @override
  Widget build(BuildContext c) {

    return MaterialApp(

      home: Scaffold(
        appBar: AppBar(title: Text('Quiz App'),),
        body: _questionIndex < _questions.length
          ? Quiz(
            answerQuestion: _answerQuestion,
            questionIndex: _questionIndex,
            questions: _questions,
          )
          : Result(_totalScore)
      ),

    );
  }
}



// ==========================================================================================
// ANSWER.DART:
// ------------------------------------------------------------------------------------------


import 'package:flutter/material.dart';

class Answer extends StatelessWidget {

  final Function selectHandler;
  final String answerText;

  Answer(this.selectHandler, this.answerText);

  @override
  Widget build(BuildContext context) {
    return Container(
      width: double.infinity,
      margin: EdgeInsets.fromLTRB(20, 0, 20, 5),

      child: RaisedButton(
        color: Colors.blue,
        textColor: Colors.white,

        child: Text(answerText),
        onPressed: selectHandler,
      ),
    );
  }
}

// ==========================================================================================
// RESULT.DART:
// ------------------------------------------------------------------------------------------

import 'package:flutter/material.dart';

class Result extends StatelessWidget {

  final int resultScore;

  Result(this.resultScore);

  String get resultPhrase {
    String resultText;

    if(resultScore <= 5){
      resultText = 'Could be better.';
    }else{
      resultText = 'You did it!';
    }

    return resultText;
  }

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text(resultPhrase,
        style: TextStyle(
          fontSize: 36,
          fontWeight: FontWeight.bold
        ),
      ),
    );
  }
}