/*
* Fill the List with newly generated facts if no known facts exist;
* otherwise, fill with unknown facts.
*/
void generateFactsList(ref FactsQueue facts, MathOperation oper, UserProfile userProfile)
{
FactsList mathFactsList = new FactsList ();
// Determine whether to read previously generated facts or generate new facts.
if ((System.IO.File.Exists (FactsFiles.getDailyFactsFilename (oper.operationType, false))))
{
readUnknownFactsFromFile (ref mathFactsList, oper);
}
else
{
generateAndStoreNewFacts (ref mathFactsList, oper, userProfile);
}
// Determine the number of facts and obtain a set of random numbers for displaying of the facts
if (mathFactsList != null)
{
randomizeFacts (ref facts, mathFactsList);
}
}
/*
* Fills the List with random numbers equivalent to the number of facts to
* display them in a random order.
*/
static void randomizeFacts(ref FactsQueue facts, FactsList factsList)
{
Random random = new Random ();
int randomNumber;
List<int> factsOrder = new List<int> ();
while (factsOrder.Count () < factsList.Count ())
{
// Check that the number is unique.
do
{
randomNumber = random.Next (factsList.Count ());
} while (factsOrder.Contains (randomNumber));
factsOrder.Add (randomNumber);
}
// Assign the numbers to a queue to display them in a random order.
facts = new FactsQueue (factsOrder.Count ());
foreach (int index in factsOrder)
{
facts.Enqueue (factsList[factsOrder[index]]);
}
}
/*
* Read unmastered facts from the file.
*/
static void readUnknownFactsFromFile(ref FactsList mathFactsList, MathOperation operation)
{
try
{
String[] numbers = System.IO.File.ReadAllLines (FactsFiles.getDailyFactsFilename (operation.operationType,
false));
Fact newFact = new Fact ();
newFact.operation = operation;
for (int index = 0; index < numbers.Count (); ++index)
{
newFact.leftNum = System.Convert.ToInt32 (numbers[index++]);
if (numbers.Count () != 0)
{
newFact.rightNum = System.Convert.ToInt32 (numbers[index]);
mathFactsList.Add (newFact);
}
}
}
catch (Exception e)
{
if (e.InnerException is System.IO.FileNotFoundException)
{
MessageBox.Show ("The file with your unmastered facts could not be found.");
return;
}
else
{
MessageBox.Show ("There was a problem reading the file with your unmastered facts.");
Application.Exit ();
}
}
}
/*
* Generate and stores the facts.
*/
static void generateAndStoreNewFacts(ref FactsList factsList, MathOperation operation, UserProfile userProfile)
{
Fact newFact;
newFact.operation = operation;
MathOperationTypeEnum operationType = operation.operationType;
// Generate facts starting from 0 to the max number.
for (int i = 0; i <= userProfile.maxFactNumbers[System.Convert.ToInt16 (operation.operationType)]; ++i)
{
for (int j = 0; j <= userProfile.maxFactNumbers[System.Convert.ToInt16 (operation.operationType)]; ++j)
{
if (operationType == MathOperationTypeEnum.ADDITION ||
operationType == MathOperationTypeEnum.MULTIPLICATION)
{
newFact.leftNum = i;
newFact.rightNum = j;
factsList.Add (newFact);
}
// Don't allow division by 0 or results with remainders for division facts.
else if (i >= j && (operationType == MathOperationTypeEnum.SUBTRACTION ||
(operationType == MathOperationTypeEnum.DIVISION && j != 0 && (i % j == 0))))
{
newFact.leftNum = i;
newFact.rightNum = j;
factsList.Add (newFact);
}
}
}
}
