/// <summary>
/// Filter divers by certificate category.
/// Divers with highest category will be deleted.
/// </summary>
/// <param name="divers">List of divers</param>
/// <param name="numOfDiversToRemove">Number of divers to delete</param>
public void FilterDivers(List <Diver> divers, int numOfDiversToRemove)
{
// Find max category
int max = divers.Max(x => x.certificate.AbsoluteLevel);
// Find divers with max category
List <Diver> diversToRemove = divers.Where(x => x.certificate.AbsoluteLevel == max).ToList();
foreach (Diver diverToRemove in diversToRemove)
{
if (numOfDiversToRemove-- > 0)
{
divers.Remove(diverToRemove);
}
else
{
break;
}
}
// If there are more divers that need to be deleted then go to next filter/chain
if (numOfDiversToRemove > 0)
{
nextFilter.FilterDivers(divers, numOfDiversToRemove);
}
}
/// <summary>
/// Filter divers by number of dives
/// Divers with less dives will not be deleted.
/// </summary>
/// <param name="divers">List of divers</param>
/// <param name="numOfDiversToRemove">Number of divers to delete</param>
public void FilterDivers(List <Diver> divers, int numOfDiversToRemove)
{
// Find maximum number of dives per diver
int max = divers.Max(x => x.NumOfDives);
// Create list of divers that have max number of dives
List <Diver> diversToRemove = divers.Where(x => x.NumOfDives == max).ToList();
foreach (Diver diverToRemove in diversToRemove)
{
if (numOfDiversToRemove-- > 0)
{
divers.Remove(diverToRemove);
}
else
{
break;
}
}
// If there are more divers that need to be deleted then go to next filter/chain
if (numOfDiversToRemove > 0)
{
nextFilter.FilterDivers(divers, numOfDiversToRemove);
}
}
/// <summary>
/// Remove divers with most recent dive date
/// and keep those with oldest dive date
/// </summary>
/// <param name="divers">List of divers</param>
/// <param name="numOfDiversToRemove">Number of divers to remove</param>
public void FilterDivers(List <Diver> divers, int numOfDiversToRemove)
{
// Find most recent date
DateTime mostRecentDiveDate = divers.Max(x => x.DiveList.Max(y => y.dateTime));
for (int i = divers.Count() - 1; i >= 0; i--)
{
// Check if diver have dive with most recent date
// if he have then delete him
bool hasDive = divers[i].DiveList.Exists(x => x.dateTime == mostRecentDiveDate);
if (hasDive && numOfDiversToRemove-- > 0)
{
divers.Remove(divers[i]);
}
}
// If there are more divers that need to be deleted then go to next filter/chain
if (numOfDiversToRemove > 0)
{
nextFilter.FilterDivers(divers, numOfDiversToRemove);
}
}
/// <summary>
/// Pass list of divers through filter chain
/// </summary>
/// <param name="diverList">List of divers for filtering</param>
/// <param name="numOfDiversToRemove">Number of divers to remove</param>
public void FilterDivers(List <Diver> diverList, int numOfDiversToRemove)
{
filterFirst.FilterDivers(diverList, numOfDiversToRemove);
}