/// <summary>
/// Generates the actual random assignments from the composition of members and gifts.
/// </summary>
/// <param name="assignGifts">
/// Whether to include gifts in the the random assignment
/// </param>
/// <returns>
/// The <see cref="string"/>.
/// </returns>
public static string GenerateAssignments(bool assignGifts)
{
var rand = new Random();
List <Member> members = new MemberDataOperations().GetAll().ToList();
if (members.Count <= 1)
{
return("There needs to be more than 1 member added to assign");
}
List <Gift> gifts = new GiftDataOperations().GetAll().ToList();
if (assignGifts && gifts.Count < 1)
{
return("There are no gifts to assign");
}
var assignments = new Collection <Assignments>();
while (members.Count > 0)
{
var assignment1 = new Assignments();
var assignment2 = new Assignments();
Assignments assignment3 = null;
int index = rand.Next(members.Count);
Member member1 = members[index];
members.RemoveAt(index);
index = rand.Next(members.Count);
Member member2 = members[index];
members.RemoveAt(index);
assignment1.MemberId = member1.MemberId;
assignment1.AssignedMemberId = member2.MemberId;
assignment2.MemberId = member2.MemberId;
assignment2.AssignedMemberId = member1.MemberId;
Member member3 = null;
// Handle the edge case where we have 3 members
if (members.Count == 1)
{
index = rand.Next(members.Count);
member3 = members[index];
members.RemoveAt(index);
assignment3 = new Assignments();
assignment3.MemberId = member3.MemberId;
}
if (assignGifts)
{
Gift gift1 = gifts[rand.Next(gifts.Count)];
Gift gift2 = gifts[rand.Next(gifts.Count)];
assignment1.AssignedGiftId = gift1.GiftId;
assignment2.AssignedGiftId = gift2.GiftId;
if (member3 != null)
{
Gift gift3 = gifts[rand.Next(gifts.Count)];
assignment3.AssignedGiftId = gift3.GiftId;
assignment2.AssignedMemberId = member3.MemberId;
assignment3.AssignedMemberId = member1.MemberId;
assignments.Add(assignment3);
}
assignments.Add(assignment1);
assignments.Add(assignment2);
}
else
{
if (member3 != null)
{
assignment2.AssignedMemberId = member3.MemberId;
assignment3.AssignedMemberId = member1.MemberId;
assignments.Add(assignment3);
}
assignments.Add(assignment1);
assignments.Add(assignment2);
}
}
// We can drop here because we're just going to regenerate from existing data
new AssignmentDataOperations().DropAssignmentTable();
if (new AssignmentDataOperations().AddMultipleRecords(assignments) < 2)
{
return("Assignment failed!");
}
return(null);
}