Monster strategy

I thought about how I could implement monster strategy. On one hand, I want monsters to have many different behavior patterns to give players a varying game experience. This screams like an application for the Strategy pattern. But I also want to keep my Controller pattern where monsters are controlled from the outside. That's because I want some monsters to act as teams and be aware of what other monsters around them are doing. So I decided that every spawn area shall have its own MonsterController, which in turn gets four different strategies assigned to it:

• SpawnStrategy: When and where it spawns mobs  
• TargetStrategy: How it decides which monsters attack which players
• RoamingStrategy: Behavior of monsters without an attack target
• AttackStrategy: Behavior of monsters which have an attack target

Here are some example strategies for each category:

Spawn	ReplaceSingle	Respawns dead mobs until the population reached a certain value
	ReplaceTeam	When all mobs have died, respawn them all.
	Ambush	Like ReplaceTeam, but only spawn them when a player is in a specific area.
Target	null	never choose an attack target
	Closest	Chooses the target closest to the monster
	ClosestTeam	Chooses the target closest to any controlled monster
	LastAttacker	Chooses the last combatant who attacked the monster
	LastAttackerTeam	Chooses the last combatant who attacked any monster of the team
	BestAttacker	Chooses the combatant who did most damage to monster
	BestAttackerTeam	Chooses the combatant who did most damage to all monsters of the team
Roaming	null	do not move when not in combat
	Guard	Return to spawn position when not in combat
	Map	Move randomly around the whole map
	Area	Move randomly around the spawn area
	Team	Move randomly to positions around the center of the team
	Patrol	Move along a predefined set of waypoints
	PatrolTeam	Move along a predefined set of waypoints, wait until everyone has reached the waypoint
Attack	null	never attack, never move when in combat
	Stationary	Use a random attack which is in range
	Pursuit	Choose random attack. When in range, use it. When not in range, move into range.
	Stalk	Choose random attack, move close to maximum range, use it.
	Flee	Don't attack. Try to hold a minimum distance to target.

Every monster type has a default strategy for each category. But spawn areas can manually override them. So you can have, for example, a demon castle where some demons patrol the surrounding, two demons guard the front gate, a group which ambushs any players who gets past the guards and some which roam the interior.