class_name ActionExecutionSystem
extends RefCounted


func advance_npc(npc: SimNPC, village: SimVillage) -> void:
	if npc.is_dead:
		return
	_update_needs(npc, village)
	if npc.mourning_ticks > 0:
		npc.mourning_ticks -= 1
	if npc.is_dead or npc.task_state != SimNPC.TASK_STATE_WORKING:
		return
	npc.task_progress += 1.0
	if npc.task_progress >= npc.task_duration:
		npc.task_complete = true
		npc.task_state = SimNPC.TASK_STATE_COMPLETE


func _update_needs(npc: SimNPC, village: SimVillage) -> void:
	npc.hunger += 0.125 * village.food_modifier
	match npc.task_state:
		SimNPC.TASK_STATE_IDLE:
			npc.energy -= 0.125
		SimNPC.TASK_STATE_TRAVELING:
			npc.energy -= 0.5
		SimNPC.TASK_STATE_WORKING:
			if npc.current_task == SimulationIds.ACTION_SLEEP:
				npc.energy = minf(npc.energy + 1.0, 100.0)
			elif npc.current_task == SimulationIds.ACTION_REST:
				pass
			else:
				npc.energy -= 0.5
		SimNPC.TASK_STATE_COMPLETE:
			npc.energy -= 0.0625
	npc.hunger = clamp(npc.hunger, 0.0, 100.0)
	npc.energy = clamp(npc.energy, 0.0, 100.0)
	npc.is_starving = npc.hunger >= 90.0
	npc.starvation_ticks = npc.starvation_ticks + 1 if npc.is_starving else 0
	if npc.starvation_ticks >= npc.starvation_death_threshold:
		npc.die_from_starvation()