using BaseGames.AI;

namespace BaseGames.Enemies
{
    /// <summary>
    /// E001（草蛭）的 AI 定义：巡逻 → 追击（接触即伤害，无需攻击能力）→ 搜查 → 巡逻。
    /// 数值目前用字面量常量；后续可外挂 SO 做热调。
    /// </summary>
    [AiDefinition("E001")]
    public sealed class E001CaoZhiAi : AiScript
    {
        const float LoseTimeout = 2.5f; // 丢失玩家判定
        const float SearchTime = 3f;    // 搜查后返回巡逻

        protected override void Build(BrainBuilder b)
        {
            b.Entry("Patrol");

            // 死亡：全局事件，终止决策
            b.Global().To("Dead").OnEvent(AiSignal.Died);

            b.State("Patrol")
                .Tick(c => c.Mover.WalkRandom())
                .To("Chase").When(c => c.Sensor.SeesPlayer(), "SeesPlayer");

            b.State("Chase")
                .OnEnter(c => c.Mover.FacePlayer())
                .Tick(c => c.Mover.MoveTo(c.Sensor.LastKnown)) // 冲向玩家，接触即由 BodyContactDamage 造成伤害
                .To("Search").When(c => c.Sensor.LostFor(LoseTimeout), "LostFor");

            b.State("Search")
                .OnEnter(c => c.Mover.LookAround())
                .To("Chase").When(c => c.Sensor.SeesPlayer(), "SeesPlayer")
                .To("Patrol").After(SearchTime);

            b.State("Dead")
                .OnEnter(c => c.Mover.Stop());
        }
    }
}