public QuestionPageViewModel(QuestionModel question)
{
_question = question;
this.Answers = new List<AnswerViewModel>();
foreach (var answer in question.Answers)
{
this.Answers.Add(new AnswerViewModel(answer, question.Answers.IndexOf(answer)));
}
}
private QuestionPageViewModel SetUpQuestionPageViewModel()
{
const int MAX_FOLLOWEES_TO_USE_FOR_ANSWERS = 4;
const int MAX_TWEETS_TO_RETRIEVE_FOR_FOLLOWEE = 50;
const int MAX_FOLLOWEES_TO_RETRIEVE_FOR_USER = 100;
string screenName = UserStateRepository.User.TwitterUserName;
string friendsListUrlFormat = ConfigurationManager.AppSettings["twitterFriendsListUrlFormat"];
try {
var twitterHelper = UserStateRepository.GetTwitterHelper();
//Get a list of followees (called "friends" in the API) to work with
var friendsListRequestSettings = new FriendsListRequestSettings {
ScreenName = screenName,
Count = MAX_FOLLOWEES_TO_RETRIEVE_FOR_USER,
IncludeUserEntities = false,
SkipStatus = true,
RequestUrlFormat = friendsListUrlFormat
};
var friendsListJson = twitterHelper.GetFriendsListJson(friendsListRequestSettings);
var friendsListItems = JsonConvert.DeserializeObject<FriendsList>(friendsListJson);
//If user does not have at least four followees, he can't play
if (friendsListItems == null || friendsListItems.Users == null || friendsListItems.Users.Count == 0) {
//todo: Handle this exception somewhere up the call stack
throw new Exception("You must be following at least four people to play.");
}
//Randomly select four distinct followees
int followeesCount = friendsListItems.Users.Count;
var randomFollowees = new List<User>();
Random random = new Random();
for (int i = 0; i < MAX_FOLLOWEES_TO_USE_FOR_ANSWERS; i++) {
bool distinctRandomUserFound = false;
while (!distinctRandomUserFound) {
int randomIndex = random.Next(0, followeesCount);
var followee = friendsListItems.Users[randomIndex];
if (!randomFollowees.Contains(followee)) {
randomFollowees.Add(followee);
distinctRandomUserFound = true;
}
}
}
//Randomly choose one of the random followees to be the one with the correct answer
int randomIndexForCorrectAnswerFollowee = random.Next(0, MAX_FOLLOWEES_TO_USE_FOR_ANSWERS);
var correctAnswerFollowee = randomFollowees[randomIndexForCorrectAnswerFollowee];
var questionModel = new QuestionModel {
Answers = new List<AnswerModel>(),
QuestionUserName = correctAnswerFollowee.ScreenName
};
//Get a random tweet from the "correct" followee and add it to the question model
string randomTweetForCorrectAnswerFollowee = GetRandomTweetForUser(correctAnswerFollowee.ScreenName, MAX_TWEETS_TO_RETRIEVE_FOR_FOLLOWEE);
questionModel.Text = randomTweetForCorrectAnswerFollowee;
//Set up the list of answers (followees' screen names) and randomize their order
questionModel.Answers = randomFollowees.Select(x => new AnswerModel { UserName = x.ScreenName }).ToList();
questionModel.Answers.Shuffle();
//Package it all up in a QuestionPageViewModel
var questionPageViewModel = new QuestionPageViewModel(questionModel) {
Score = UserStateRepository.User.Score
};
return questionPageViewModel;
}
catch (Exception ex) {
Console.WriteLine(ex.ToString());
throw ex;
}
}