/// <summary>
/// Loads all question sets from a program's folder
/// </summary>
/// <param name="errors">Returns list of potential errors</param>
/// <returns>List of question sets</returns>
public static ObservableCollection <QSet> LoadQuestionSets(out List <string> errors)
{
ObservableCollection <QSet> qSets = new ObservableCollection <QSet>();
QSet qSet = null;
errors = new List <string>();
string[] files = Directory.GetFiles(dataDir, "*.csv");
foreach (string file in files)
{
try
{
qSet = LoadQSetFromFile(file);
if (qSet != null)
{
qSets.Add(qSet);
}
}
catch (Exception ex)
{
errors.Add(ex.Message);
}
}
return(qSets);
}
/// <summary>
/// Loads one question set from a file
/// </summary>
/// <param name="path">File location</param>
/// <returns>Question set or null if file's content is invalid</returns>
public static QSet LoadQSetFromFile(string path)
{
QSet qSet = new QSet();
qSet.Path = path;
using (StreamReader sr = new StreamReader(path))
{
string s = sr.ReadLine();
if (s == null) //checks wheter the first line is not null
{
throw new ArgumentException(path + " First line is null, can't load");
}
qSet.Name = s.TrimEnd(';');
sr.ReadLine();
Difficulty difficulty = Difficulty.Easy;
s = sr.ReadLine();
int line = 3;
while (s != null)
{
if (s.StartsWith(TAG_FIRST_CHAR)) //checks wheter higher difficulty section was reached
{
if (difficulty < Difficulty.Hard) //checks wheter highest difficulty level was reached
{
difficulty++;
s = sr.ReadLine();
}
else
{
throw new ArgumentException(path + " Špatný počet značek pro změnu obtížnosti, nelze načíst.");
}
}
string[] split = s.Split(';');
if (split.Length != 5) //checks wheter the line contains exactly 5 strings
{
throw new ArgumentException(path + $" Špatný počet řetězců na řádku {line}, nelze načíst.");
}
qSet.AddQuestion(difficulty, split[0], split[1], split[2], split[3], split[4]);
line++;
s = sr.ReadLine();
}
}
if (qSet.EasyQuestions.Count() >= 5 && qSet.MediumQuestions.Count() >= 5 && qSet.HardQuestions.Count() >= 5)
{
return(qSet);
}
else
{
throw new ArgumentException(path + " Nedostatek otázek stejné obtížnosti, nelze načíst.");
}
}
public override void LoadQuestions(List <QSet> selectedQSets)
{
GameQSet = new QSet();
QSetsNames = new List <string>();
foreach (QSet qSet in selectedQSets) //load questions from selected qsets
{
GameQSet.EasyQuestions.AddRange(qSet.EasyQuestions);
GameQSet.MediumQuestions.AddRange(qSet.MediumQuestions);
GameQSet.HardQuestions.AddRange(qSet.HardQuestions);
QSetsNames.Add(qSet.Name);
}
currentQList = GameQSet.EasyQuestions;
}
/// <summary>
/// Save given qSet to destination in his Path property
/// </summary>
/// <param name="qSet"></param>
public static void SaveQSet(QSet qSet)
{
if (qSet.Path == null)
{
qSet.Path = GenerateFilePath(qSet.Name);
}
using (StreamWriter writer = new StreamWriter(qSet.Path, false, Encoding.UTF8))
{
writer.WriteLine(qSet.Name);
writer.WriteLine(EASY_SECTION_TAG); //difficulty section tag
List <Question> questions = qSet.EasyQuestions; //start with writing easy questions
string[] parts = new string[5];
Difficulty difficulty = Difficulty.Easy;
bool loop = true;
while (loop)
{
foreach (Question question in questions)
{
parts[0] = question.QuestionSentence;
parts[1] = question.RightAnswer;
parts[2] = question.WrongAnswer1;
parts[3] = question.WrongAnswer2;
parts[4] = question.WrongAnswer3;
writer.WriteLine(string.Join(";", parts));
}
difficulty++;
if (difficulty == Difficulty.Medium)
{
writer.WriteLine(MEDIUM_SECTION_TAG);
questions = qSet.MediumQuestions;
}
else if (difficulty == Difficulty.Hard)
{
writer.WriteLine(HARD_SECTION_TAG);
questions = qSet.HardQuestions;
}
else
{
loop = false;
}
}
}
}
/// <summary>
/// Checks number of questions in QSet
/// </summary>
/// <param name="qSet"></param>
/// <returns>Error message; null if QSet is ok</returns>
public static string CheckQSet(QSet qSet)
{
if (qSet.EasyQuestions.Count() < MINIMUM_OF_QUESTIONS)
{
return($"Nedostatek jednoduchých otázek. Musí jich být alespoň {MINIMUM_OF_QUESTIONS}.");
}
if (qSet.MediumQuestions.Count() < MINIMUM_OF_QUESTIONS)
{
return($"Nedostatek středně těžkých otázek. Musí jich být alespoň {MINIMUM_OF_QUESTIONS}.");
}
if (qSet.HardQuestions.Count() < MINIMUM_OF_QUESTIONS)
{
return($"Nedostatek těžkých otázek. Musí jich být alespoň {MINIMUM_OF_QUESTIONS}.");
}
return(null);
}