/*

     File: Quiz.h

 Abstract: Model class for a Quiz.  Manages loading the quiz 

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

 responses.

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#import <Foundation/Foundation.h>

#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;

@interface Quiz : NSObject

- (id)initWithQuestionsPlistAtURL:(NSURL*)questionsURL;

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

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

- (void)resetQuiz;

#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