/// <summary>Checks against the guards for the command.</summary>
/// <param name="actionInput">The full input specified for executing the command.</param>
/// <returns>A string with the error message for the user upon guard failure, else null.</returns>
public override string Guards(ActionInput actionInput)
{
IController sender = actionInput.Controller;
string commonFailure = VerifyCommonGuards(actionInput, ActionGuards);
if (commonFailure != null)
{
return commonFailure;
}
if (actionInput.Params.Length == 0)
{
return null;
}
// TODO: CommonGuards.RequiresAtLeastOneArgument makes the length check redundant?
string targetName = (actionInput.Params.Length > 0) ? actionInput.Params[0] : string.Empty;
string targetFullName = actionInput.Tail.Trim().ToLower();
// Try to find the target either by all the parameter text or by just the first parameter.
this.target = GameAction.GetPlayerOrMobile(targetFullName) ?? GameAction.GetPlayerOrMobile(targetName);
// Rule: Is the target an entity?
if (this.target == null)
{
return "You cannot see " + targetName + ".";
}
// Rule: Is the target the initator?
if (sender.Thing.Name.ToLower() == this.target.Name.ToLower())
{
return "You can't follow yourself.";
}
// Rule: Is the target in the same room?
if (sender.Thing.Parent.ID != this.target.Parent.ID)
{
return targetName + " does not appear to be in the vicinity.";
}
SenseManager senses = new SenseManager();
senses.AddSense(new Sense { SensoryType = SensoryType.Sight, Enabled = true });
if (!this.target.IsDetectableBySense(senses))
{
return targetName + " does not appear to be in the vicinity.";
}
return null;
}
