#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：按预设路点顺序巡逻（支持 Transform 引用或内联 Vector2 坐标两种模式）。
    ///
    /// <list type="bullet">
    ///   <item><b>m_Waypoints（Transform[]）</b>：拖入场景中的路点对象；适合动态路点（可在运行时移动）。</item>
    ///   <item><b>m_InlineWaypoints（Vector2[]）</b>：直接填写世界坐标；无需在场景中放置对象，编辑器中以 Gizmo 可视化路径。</item>
    ///   <item>两者同时设置时 m_Waypoints 优先。</item>
    /// </list>
    ///
    /// 到达最后一个路点后可循环（Loop）或往返（PingPong）。
    /// 与 PathBerserker2d 集成：通过 IPathAgent.RequestMoveTo 导航，支持跨平台跳跃 NavLink。
    /// </summary>
    [TaskName("Patrol (Waypoints)")]
    [TaskCategory("BaseGames/Enemy/Movement")]
    [TaskDescription("按预设路点顺序巡逻；支持 Transform 引用或内联 Vector2 坐标，可循环或折返")]
    public sealed class BD_PatrolWaypoints : Action
    {
        [Tooltip("路点列表（世界空间 Transform）；与 m_InlineWaypoints 同时设置时此项优先")]
        [SerializeField] private Transform[] m_Waypoints;

        [Tooltip("内联路点坐标（世界空间 Vector2）；m_Waypoints 为空时使用；在 Scene 视图中以绿色 Gizmo 可视化")]
        [SerializeField] private Vector2[] m_InlineWaypoints;

        [Tooltip("到达路点的判定半径（m）")]
        [SerializeField] private float m_ArriveRadius = 0.3f;

        [Tooltip("true = 往返; false = 循环")]
        [SerializeField] private bool m_PingPong = false;

        [Tooltip("每个路点到达后等待时长（s）")]
        [SerializeField] private float m_WaitAtWaypoint = 0f;

        private EnemyBase _enemy;
        private int       _index     = 0;
        private int       _dir       = 1;
        private float     _waitTimer = 0f;
        private bool      _waiting   = false;

        // ── 统一路点访问 ────────────────────────────────────────────────────
        private int WaypointCount =>
            m_Waypoints != null && m_Waypoints.Length > 0
                ? m_Waypoints.Length
                : m_InlineWaypoints?.Length ?? 0;

        private Vector2 GetWaypoint(int index)
        {
            if (m_Waypoints != null && m_Waypoints.Length > 0)
            {
                var t = m_Waypoints[index];
                return t != null ? (Vector2)t.position : (Vector2)transform.position;
            }
            return m_InlineWaypoints != null && index < m_InlineWaypoints.Length
                ? m_InlineWaypoints[index]
                : (Vector2)transform.position;
        }

        // ── BD 生命周期 ─────────────────────────────────────────────────────
        public override void OnAwake() => _enemy = gameObject.GetComponent<EnemyBase>();

        public override void OnStart()
        {
            if (WaypointCount == 0) return;
            _waiting   = false;
            _waitTimer = 0f;
            _enemy?.SetAiPhase(AiPhase.Patrol);
            RequestCurrent();
        }

        public override TaskStatus OnUpdate()
        {
            if (_enemy == null || WaypointCount == 0)
                return TaskStatus.Failure;

            if (_waiting)
            {
                _waitTimer -= Time.deltaTime;
                if (_waitTimer > 0f) return TaskStatus.Running;
                _waiting = false;
                Advance();
                RequestCurrent();
            }
            else
            {
                Vector2 wp      = GetWaypoint(_index);
                float   sqrDist = ((Vector2)_enemy.transform.position - wp).sqrMagnitude;

                if (sqrDist <= m_ArriveRadius * m_ArriveRadius)
                {
                    if (m_WaitAtWaypoint > 0f)
                    {
                        _waiting   = true;
                        _waitTimer = m_WaitAtWaypoint;
                        _enemy.StopMovement();
                    }
                    else
                    {
                        Advance();
                        RequestCurrent();
                    }
                }
                else
                {
                    _enemy.MoveTo(wp);
                    _enemy.Movement?.FaceTarget(wp);
                }
            }
            return TaskStatus.Running;
        }

        public override void OnEnd() => _enemy?.StopMovement();

        // ── 内部辅助 ────────────────────────────────────────────────────────
        private void RequestCurrent()
        {
            if (WaypointCount == 0) return;
            _enemy.MoveTo(GetWaypoint(_index));
        }

        private void Advance()
        {
            if (WaypointCount <= 1) return;
            if (m_PingPong)
            {
                _index += _dir;
                if (_index >= WaypointCount) { _index = WaypointCount - 2; _dir = -1; }
                else if (_index < 0)         { _index = 1;                 _dir =  1; }
            }
            else
            {
                _index = (_index + 1) % WaypointCount;
            }
        }

        // ── Gizmo 可视化（仅 m_InlineWaypoints 模式）────────────────────────
#if UNITY_EDITOR
        private new void OnDrawGizmos()
        {
            if (m_InlineWaypoints == null || m_InlineWaypoints.Length < 1) return;
            // m_Waypoints 存在时不绘制，避免与场景路点重叠
            if (m_Waypoints != null && m_Waypoints.Length > 0) return;

            Gizmos.color = new Color(0.2f, 0.85f, 0.2f, 0.8f);
            for (int i = 0; i < m_InlineWaypoints.Length; i++)
            {
                Gizmos.DrawWireSphere(m_InlineWaypoints[i], m_ArriveRadius);

                if (i < m_InlineWaypoints.Length - 1)
                    Gizmos.DrawLine(m_InlineWaypoints[i], m_InlineWaypoints[i + 1]);
            }

            // PingPong 时也画返回线；Loop 时画首尾连接线
            if (m_InlineWaypoints.Length >= 2)
            {
                if (m_PingPong)
                {
                    // 往返：虚线效果（半透明线）
                    Gizmos.color = new Color(0.2f, 0.85f, 0.2f, 0.35f);
                    Gizmos.DrawLine(m_InlineWaypoints[m_InlineWaypoints.Length - 1], m_InlineWaypoints[0]);
                }
                else
                {
                    // 循环：画首尾连接
                    Gizmos.color = new Color(0.2f, 0.85f, 0.2f, 0.5f);
                    Gizmos.DrawLine(m_InlineWaypoints[m_InlineWaypoints.Length - 1], m_InlineWaypoints[0]);
                }
            }

            // 编辑器标签（路点序号）
            UnityEditor.Handles.color = new Color(0.2f, 0.85f, 0.2f, 1f);
            for (int i = 0; i < m_InlineWaypoints.Length; i++)
                UnityEditor.Handles.Label(m_InlineWaypoints[i] + Vector2.up * 0.25f, $"WP{i}");
        }
#endif
    }
}
#endif