/// <summary>
/// Removes a set of skill levels from this plan.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="skillsToRemove">The skill levels to remove.</param>
/// <returns>
/// An object allowing to perform and control the removal.
/// </returns>
public IPlanOperation TryRemoveSet <T>(IEnumerable <T> skillsToRemove)
where T : ISkillLevel
{
IEnumerable <PlanEntry> allEntriesToRemove = GetAllEntriesToRemove(skillsToRemove);
// Creates a plan where the entries and their dependencies have been removed
PlanScratchpad freePlan = new PlanScratchpad(Character);
freePlan.RebuildPlanFrom(Items);
foreach (PlanEntry entry in allEntriesToRemove)
{
freePlan.Remove(entry);
}
// Gather removables prerequisites now useless
List <PlanEntry> removablePrerequisites = new List <PlanEntry>();
foreach (PlanEntry prereqEntry in allEntriesToRemove.SelectMany(
entryToRemove => Items.Where(entryToRemove.IsDependentOf).Where(
prereq => freePlan.GetMinimumLevel(prereq.Skill) == 0).Select(
prereq => freePlan.GetEntry(prereq.Skill, prereq.Level)).Where(
prereqEntry => prereqEntry != null && prereqEntry.Type == PlanEntryType.Prerequisite)))
{
removablePrerequisites.Add(prereqEntry);
freePlan.Remove(prereqEntry);
}
// Create the operation
return(new PlanOperation(this, skillsToRemove.Cast <ISkillLevel>(), allEntriesToRemove,
removablePrerequisites));
}
