#if GRAPH_DESIGNER
using UnityEngine;
using Opsive.BehaviorDesigner.Runtime.Tasks;
using Opsive.BehaviorDesigner.Runtime.Tasks.Actions;
using BaseGames.Enemies;

namespace BaseGames.Enemies.AI
{
    /// <summary>
    /// BD Action：启动 Boss 阶段过渡演出（无敌帧 + 可选定格），等待过渡完成后返回 Success。
    ///
    /// 返回 Running：过渡演出进行中（BossBase.IsPhaseTransitioning = true）。
    /// 返回 Success：过渡完成，已切换到目标阶段。
    /// 返回 Failure：BossBase 组件不存在。
    ///
    /// 典型 BT 用法：
    ///   Sequence [ BD_IsHPBelow(0.5) → BD_BossPhaseTransition(Phase=1, Duration=1.5) → ... ]
    /// </summary>
    [TaskName("Boss Phase Transition")]
    [TaskCategory("BaseGames/Enemy/Boss")]
    [TaskDescription("触发 Boss 阶段过渡演出（无敌 + 动画 + 广播事件）")]
    public class BD_BossPhaseTransition : Action
    {
        [Tooltip("切换到的目标阶段索引")]
        [SerializeField] private int m_TargetPhase = 1;

        [Tooltip("无敌帧 + 过渡演出持续时间（秒）")]
        [SerializeField, Min(0f)] private float m_InvincibleDuration = 1.5f;

        private BossBase _boss;
        private bool     _started;

        public override void OnAwake() => _boss = GetComponent<BossBase>();

        public override void OnStart()
        {
            _started = false;
        }

        public override TaskStatus OnUpdate()
        {
            if (_boss == null) return TaskStatus.Failure;

            if (!_started)
            {
                _boss.BeginPhaseTransition(m_TargetPhase, m_InvincibleDuration);
                _started = true;
            }

            return _boss.IsPhaseTransitioning ? TaskStatus.Running : TaskStatus.Success;
        }
    }
}
#endif