- (void)shuffle {
    if (!mReady) return;

    NSMutableArray *result = [NSMutableArray array];

    NSMutableArray *questionsCopy = [mQuestions mutableCopy];//[NSMutableArray arrayWithArray:mQuestions];

    do {
        int randomIndex = 0;

        randomIndex = arc4random() % [questionsCopy count];
        [result addObject:[questionsCopy objectAtIndex:randomIndex]];
        [questionsCopy removeObjectAtIndex:randomIndex];
    } while (([questionsCopy count] > 0));

    [mQuestions removeAllObjects];
    [mQuestions setArray:result];
}

#pragma mark -

- (void)parserDidStartDocument:(NSXMLParser *)parser {
    mReady = NO;

    [mQuestions removeAllObjects];
}

- (void)parserDidEndDocument:(NSXMLParser *)parser {
    mReady = YES;

    dispatch_async(dispatch_get_main_queue(), ^{
        if (mDelegate && [mDelegate respondsToSelector:@selector(quizGeneratorDidLoad:)]) {
            [mDelegate quizGeneratorDidLoad:self];
        }
    });

    if (mCurrentElement) {
        [mCurrentElement release];
        mCurrentElement = nil;
    }

    if (mCurrentQuestion) {
        [mCurrentQuestion release];
        mCurrentQuestion = nil;
    }

    if (mCurrentAnswer) {
        [mCurrentAnswer release];
        mCurrentAnswer = nil;
    }

    if (mMutableString) {
        [mMutableString release];
        mMutableString = nil;
    }
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict {
    if ([elementName isEqualToString:@"question"]) {
        mCurrentQuestion = [[VTQuestion alloc] init];
    }

    if ([elementName isEqualToString:@"title"]) {
        // nothing to do here
    }

    if ([elementName isEqualToString:@"answers"]) {
        // nothing to do here
    }

    if ([elementName isEqualToString:@"answer"]) {
        mCurrentAnswer = [[VTAnswer alloc] init];

        NSString *correctAttr = [attributeDict objectForKey:@"correct"];

        mCurrentAnswer.correct = [correctAttr boolValue];
    }

    mCurrentElement = [elementName copy];
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
    NSString *string = [NSString stringWithString:mMutableString];

    [mMutableString setString:[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]];

    if ([mCurrentElement isEqualToString:@"title"]) {
        mCurrentQuestion.title = mMutableString;
    }

    if ([elementName isEqualToString:@"answer"]) {
        mCurrentAnswer.title = mMutableString;

        [mCurrentQuestion addAnswer:mCurrentAnswer];

        [mCurrentAnswer release];
    }

    if ([elementName isEqualToString:@"answers"]) {

    }

    if ([elementName isEqualToString:@"question"]) {
        [mQuestions addObject:mCurrentQuestion];

        [mCurrentQuestion release];
    }


    [mCurrentElement release];
    mCurrentElement = nil;

    [mMutableString release];
    mMutableString = nil;
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
    if (mMutableString == nil) {
        mMutableString = [[NSMutableString string] retain];
    }

    [mMutableString appendString:string];
}