/*

 Copyright (C) 2018 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Model class for a Quiz.  Manages loading the quiz 

  data (questions, answers) from a plist file, vending questions, and recording 

  responses.

 */

@import Foundation;

#import "Question.h"

// Structure of the Questions.plist file

// Root

//  - QuestionsList (Array)

//      0 (Dictionary)

//          QuestionText (String): Text of the question.

//          AnswerText (Array): List of responses.

//              0 (String): Text of the response

//              ...

//          Answer (Number): Index in AnswerText of the correct response.

//      ...

extern NSString * const QuestionsListKey;

extern NSString * const QuestionTextKey;

extern NSString * const AnswerTextKey;

extern NSString * const AnswerKey;

@class QuestionViewController;

@interface Quiz : NSObject

- (instancetype)init NS_UNAVAILABLE;

- (Question*)objectAtIndexedSubscript:(NSInteger)idx;

- (Question*)questionAtIndex:(NSUInteger)idx;

- (void)resetQuiz;

// Set the newQuiz as the currentQuiz of the view controller.

+ (void)setQuizOnQuestionViewController:(QuestionViewController *)controller;

#pragma mark - Statistics

//! The number of questions the user has answered correctly.

@property (readonly) NSUInteger correctlyAnsweredQuestions;

//! The number of questions the user has answered.

@property (readonly) NSUInteger answeredQuestions;

//! Total questions in the quiz.

@property (readonly) NSUInteger totalQuestions;

//! Percentage of correctly answered questions of the total questions

//! answered.

@property (readonly) float percentageScore;

@end