Touhou/client/Assets/Game/Scripts/ECS/System/AISystem.cs

using Entitas;
using UnityEngine;
using Game;

public class AISystem : IExecuteSystem, IInitializeSystem
{
    private IGroup<GameEntity> _entities;

    public void Initialize()
    {
        _entities = Util.GetGroup(GameMatcher.AI);
    }

    public void Execute()
    {
        foreach (var entity in _entities)
        {
            UpdateAI(entity);
            UpdateAIHungry(entity);
        }
    }

    private static void UpdateAIHungry(GameEntity entity)
    {
        var ai = entity.aI;
        var hp = entity.hp;
        if (!hp.IsAlive)
        {
            return;
        }

        if (ai.IsHungryFull.Value)
        {
            return;
        }

        if (ai.AttackPermit.Value)
        {
            return;
        }

        var newHungry = ai.Hungry.Value + ai.HungryIncrease * ai.HungryIncreaseRate * Time.deltaTime;
        ai.Hungry.Value = Mathf.Min(ai.HungryMax.Value, newHungry);
        if (ai.Hungry.Value >= ai.HungryMax.Value)
        {
            ai.IsHungryFull.Value = true;
            ai.Hungry.Value = 0;
        }
    }

    private static void UpdateAI(GameEntity entity)
    {
        var ai = entity.aI;
        var skill = entity.skill;
        var hp = entity.hp;
        if (!hp.IsAlive)
        {
            return;
        }

        ai.ThinkCdNow -= Time.deltaTime;
        if (ai.ThinkCdNow > 0)
        {
            return;
        }

        ai.ThinkCdNow = ai.ThinkCdMax;
        if (skill.IsRunning)
        {
            return;
        }
        ai.BehaviorTree.Tick();
    }
}