internal static IList <NameDrawResult> ExecuteNameDraw(NameDrawConfig config)
{
Console.WriteLine($"Executing namedraw with config id: {config.ConfigId}");
int drawAttempts = 1;
var result = ExecuteDraw(config);
while (!ResultsAreValid(result, config) && drawAttempts < NameDrawRetryLimit)
{
result = ExecuteDraw(config);
drawAttempts++;
}
if (drawAttempts < NameDrawRetryLimit)
{
Console.WriteLine($"Took {drawAttempts} draw attempts to satisfy all rules.");
OutputResult(result, config.OutputProviders);
NameDrawEventResults.Add(new NameDrawEventResult
{
Config = config,
Results = result
});
return(result);
}
throw new Exception("could not satisfy name-draw rule requirements based on the current number of draw attempts!");
}
private static IList <NameDrawResult> ExecuteDraw(NameDrawConfig config)
{
var participants = config.Participants;
IList <NameDrawResult> result = new List <NameDrawResult>();
foreach (var item in config.Items)
{
// execute draw for this item
// list of drawers, random order
IList <Person> drawers = participants
.Select(person => new Person {
EmailAddress = person.EmailAddress, Name = person.Name
}).ToList();
drawers = Randomize(drawers);
// list of drawees, random order
IList <Person> drawees = participants
.Select(person => new Person {
EmailAddress = person.EmailAddress, Name = person.Name
}).ToList();
drawees = Randomize(drawees);
for (int i = 0; i < participants.Count; i++)
{
NameDrawResult nameDrawResult =
new NameDrawResult {
From = drawers[i], To = drawees[i], Item = item
};
result.Add(nameDrawResult);
}
}
return(result);
}
private static bool ResultsAreValid(IList <NameDrawResult> resultList, NameDrawConfig config)
{
foreach (var nameDrawResult in resultList)
{
// don't draw self
// TODO: for now, using email address as unique id... once we use a db, can use an auto-increment field
if (nameDrawResult.From.EmailAddress == nameDrawResult.To.EmailAddress)
{
return(false);
}
// verify draw rules are satisified
foreach (var drawRule in config.DrawRules)
{
// TODO: for now, using email address as unique id... once we use a db, can use an auto-increment field
if (drawRule.RuleType == DrawRule.Rule.Exclude)
{
if (drawRule.From.EmailAddress == nameDrawResult.From.EmailAddress &&
drawRule.To.EmailAddress == nameDrawResult.To.EmailAddress)
{
return(false);
}
}
}
}
foreach (var drawRule in config.DrawRules)
{
bool foundIt = false;
if (drawRule.RuleType == DrawRule.Rule.Include)
{
foreach (var nameDrawResult in resultList)
{
if (drawRule.From.EmailAddress == nameDrawResult.From.EmailAddress &&
drawRule.To.EmailAddress == nameDrawResult.To.EmailAddress)
{
foundIt = true;
break;
}
}
if (!foundIt)
{
return(false);
}
}
}
// TODO: still need to add one more rule to ensure one person does not draw the same person for multiple items
return(true);
}