using Opsive.BehaviorDesigner.Runtime;
using Opsive.BehaviorDesigner.Runtime.Tasks;
using Opsive.GraphDesigner.Runtime.Variables;
using Opsive.Shared.Utility;
using UnityEngine;
using UnityEngine.AI;

namespace Cielonos.MainGame.Characters.AI
{
    [Description("计算跳跃的目标落点坐标，并将计算结果写入行为树的 Vector3 变量中。支持多种跳跃策略（接近、后撤、侧闪、出死角等）。")]
    [Category("Cielonos/Movement")]
    public class CalculateJumpTarget : AutomataActionBase
    {
        public enum JumpStrategy
        {
            [Tooltip("快速接近玩家：直接指向玩家位置（或预测位置）。")]
            CloseIn,
            [Tooltip("战术后撤：向自身后方跳跃拉开距离，用于准备释放远程攻击。")]
            Retreat,
            [Tooltip("侧向侧袭（Flanking）：跳到玩家侧方90度，用于绕过正面防守/激光。")]
            Flank,
            [Tooltip("挣脱死角（Escape Corner）：当靠近场景边缘/墙壁时，计算指向场地中央的跳跃点。")]
            EscapeCorner,
            [Tooltip("避险跳跃（Escape Hazard）：远离最近的玩家危险区域/地裂伤害。")]
            EscapeHazard,
            [Tooltip("原地原跳（Self Slam）：以自身当前位置为中心，通常用于大招落地原地震击。")]
            SelfSlam
        }

        [Header("Strategy Config")]
        [Tooltip("跳跃落点策略模式")]
        public JumpStrategy strategy = JumpStrategy.CloseIn;

        [Tooltip("输出的目标位置变量名称（写入行为树，供 ManualMove 读取）。")]
        public SharedVariable<Vector3> jumpLandPosition = new SharedVariable<Vector3> { Value = Vector3.zero };

        [Header("Distance Parameters")]
        [Tooltip("后撤跳跃的距离（米）。")]
        public float retreatDistance = 8f;

        [Tooltip("接近跳跃时，期望落在距离玩家多少米的位置（用于巨斧攻击范围适配）。")]
        public float closeInArrivalRadius = 2.0f;

        [Tooltip("战斗场地/房间的中心点。当从死角需要跃回场地中央时使用。")]
        public SharedVariable<Vector3> arenaCenter = new SharedVariable<Vector3> { Value = Vector3.zero };

        [Tooltip("侧向跳跃相对于玩家的偏置距离（米）。")]
        public float flankDistance = 5f;

        [Tooltip("侧向跳跃的方向选择：1 = 玩家右侧，-1 = 玩家左侧，0 = 随机。")]
        public int flankDirection = 0;

        [Header("Prediction")]
        [Tooltip("是否在 CloseIn 模式下启用玩家位置预测？")]
        public bool usePlayerPrediction = true;
        [Tooltip("预测玩家未来的提前量时间（秒）。")]
        public float predictionLeadTime = 1.0f;

        [Header("NavMesh Validation")]
        [Tooltip("是否对计算出的落点在 NavMesh 上进行合法性采样？（防止跳出地图边缘/掉落悬崖）")]
        public bool validateOnNavMesh = true;
        [Tooltip("NavMesh 采样半径。")]
        public float navMeshSampleRadius = 2f;

        public override TaskStatus OnUpdate()
        {
            if (self == null || self.player == null)
                return TaskStatus.Failure;

            Vector3 computedTarget = self.transform.position;
            Vector3 playerPos = self.player.transform.position;
            Vector3 selfPos = self.transform.position;

            switch (strategy)
            {
                case JumpStrategy.CloseIn:
                    Vector3 basePlayerPos = usePlayerPrediction 
                        ? self.PredictPlayerPosition(predictionLeadTime) 
                        : playerPos;
                    
                    Vector3 toPlayer = basePlayerPos - selfPos;
                    toPlayer.y = 0f;
                    
                    if (toPlayer.magnitude > closeInArrivalRadius)
                    {
                        // 敌人跳到连线与设定半径的交点上
                        computedTarget = basePlayerPos - toPlayer.normalized * closeInArrivalRadius;
                    }
                    else
                    {
                        computedTarget = basePlayerPos;
                    }
                    break;

                case JumpStrategy.Retreat:
                    // 计算 Boss 朝向的后方
                    Vector3 backDir = -self.transform.forward;
                    backDir.y = 0f;
                    backDir.Normalize();
                    computedTarget = selfPos + backDir * retreatDistance;
                    break;

                case JumpStrategy.Flank:
                    // 计算从玩家指向 Boss 的方向
                    Vector3 toBoss = selfPos - playerPos;
                    toBoss.y = 0f;
                    toBoss.Normalize();

                    // 计算垂直的切线方向 (左右)
                    Vector3 tangent = new Vector3(-toBoss.z, 0f, toBoss.x); // 玩家右侧
                    
                    int dir = flankDirection;
                    if (dir == 0)
                    {
                        dir = Random.value > 0.5f ? 1 : -1;
                    }

                    computedTarget = playerPos + tangent * (flankDistance * dir);
                    break;

                case JumpStrategy.EscapeCorner:
                    Vector3 toCenter = arenaCenter.Value - selfPos;
                    toCenter.y = 0f;
                    toCenter.Normalize();
                    computedTarget = selfPos + toCenter * retreatDistance;
                    break;

                case JumpStrategy.EscapeHazard:
                    // 默认向远离玩家方向跳跃，作为基础避险
                    Vector3 awayDir = selfPos - playerPos;
                    awayDir.y = 0f;
                    awayDir.Normalize();
                    computedTarget = selfPos + awayDir * retreatDistance;
                    break;

                case JumpStrategy.SelfSlam:
                    computedTarget = selfPos;
                    break;
            }

            // 对计算出的落点在 NavMesh 上进行合法性采样，防止跳出地图
            if (validateOnNavMesh)
            {
                if (NavMesh.SamplePosition(computedTarget, out NavMeshHit hit, navMeshSampleRadius, NavMesh.AllAreas))
                {
                    computedTarget = hit.position;
                }
                else
                {
                    // 如果采样失败，尝试向玩家位置收缩
                    Vector3 dirToPlayer = playerPos - computedTarget;
                    if (NavMesh.SamplePosition(computedTarget + dirToPlayer * 0.5f, out hit, navMeshSampleRadius, NavMesh.AllAreas))
                    {
                        computedTarget = hit.position;
                    }
                }
            }

            // 写入行为树变量与调试缓存
            debugComputedTarget = computedTarget;
            jumpLandPosition.SetValue(computedTarget);

            return TaskStatus.Success;
        }

        private Vector3 debugComputedTarget;

        protected override void OnDrawGizmos()
        {
#if UNITY_EDITOR
            if (debugComputedTarget != Vector3.zero)
            {
                Gizmos.color = Color.cyan;
                Gizmos.DrawWireSphere(debugComputedTarget, 0.4f);
                Gizmos.color = new Color(0.2f, 0.8f, 1.0f, 0.25f);
                Gizmos.DrawSphere(debugComputedTarget, 0.4f);

                if (self != null)
                {
                    Gizmos.color = Color.cyan;
                    Gizmos.DrawLine(self.transform.position, debugComputedTarget);
                }
            }
#endif
        }
    }
}