using BehaviorDesigner.Runtime.Tasks.EnemyAI;
using UnityEngine;
using UnityEngine.AI;

namespace BehaviorDesigner.Runtime.Tasks.Movement
{
    [TaskDescription("追寻目标.")]
    [TaskCategory("YLSJ")]
    [HelpURL("http://www.opsive.com/assets/BehaviorDesigner/Movement/documentation.php?id=9")]
    [TaskIcon("Assets/Behavior Designer Movement/Editor/Icons/{SkinColor}WanderIcon.png")]
    public class ActionSeekTarget : NavMeshMovementBase
    {
        [Tooltip("追寻的目标")]
        public SharedTransform target;

        [Tooltip("追寻成功的距离")]
        public SharedFloat seekSuccessDistance = 2;
        [Tooltip("追寻失败的距离(不能超过观察范围，否则永远不会追寻目标)")]
        public SharedFloat seekFailDistance = 7;

        [Tooltip("偏移(误差)")]
        public SharedFloat seekOffsetDistance = 0.5f;

        [BehaviorDesigner.Runtime.Tasks.Tooltip("攻击射线检测,启用后到达攻击距离会检测中间是否有障碍,有障碍则继续寻路")]
        public bool attackRayCheck = false;

        /// <summary>
        /// 出生地的警戒范围 (从出生地算，超出这个范围则不再追击目标)
        /// </summary>
        private float liveAlertDistance = 0;

        private BehaviorTree behaviorTree = null;
        private Role role = null;

        public override void OnAwake()
        {
            base.OnAwake();
            behaviorTree = gameObject.GetComponent<BehaviorTree>();
            role = gameObject.GetComponent<Role>();
        }

        public override void OnStart()
        {
            liveAlertDistance = (float)behaviorTree.GetVariable("liveAlertDistance").GetValue();
            if (m_NavMeshAgent.component.isOnNavMesh)
            {
                m_NavMeshAgent.component.isStopped = false;
            }
            //m_NavMeshAgent.component.stoppingDistance = seekSuccessDistance.Value;

            base.OnStart();
        }

        // There is no success or fail state with wander - the agent will just keep wandering
        public override TaskStatus OnUpdate()
        {
            if (target.Value == null)
            {
                return TaskStatus.Failure;
            }

            float liveDis = Vector3.Distance(transform.position, role.mLivePos);
            // 超出 出生地范围，则不再追击
            if (liveDis > liveAlertDistance)
            {
                // 返回出生地
                SetDestination(role.mLivePos);

                return TaskStatus.Failure;
            }

            float dis = Vector3.Distance(m_NavMeshAgent.component.transform.position, target.Value.position);
            Vector3 dir = target.Value.position - role.transform.position;
            dir.Normalize();

            Debug.DrawRay(role.transform.position + Vector3.up + role.transform.right, dir * dis, Color.red);
            Debug.DrawRay(role.transform.position + Vector3.up - role.transform.right, dir * dis, Color.red);
            if (dis <= seekSuccessDistance.Value && IsObstacle(dis) == false)
            {             
                if (m_NavMeshAgent.component.isOnNavMesh)
                {
                    m_NavMeshAgent.component.ResetPath();
                    m_NavMeshAgent.component.isStopped = true;
                }
                    
                return TaskStatus.Success;
            }
            else if (dis > seekFailDistance.Value + seekOffsetDistance.Value)
            {
                if (m_NavMeshAgent.component.isOnNavMesh)
                {
                    m_NavMeshAgent.component.ResetPath();
                    m_NavMeshAgent.component.isStopped = true;
                }

                return TaskStatus.Failure;
            }

            SetDestination(target.Value.position);

            //// 设置战斗状态
            //if (UI_BaseMainWindow.Instance() != null)
            //{
            //    UI_BaseMainWindow.Instance().SetFightingState(true);
            //}
            
            return TaskStatus.Running;
        }

        /// <summary>
        /// 是否没有障碍
        /// </summary>
        /// <returns>true没有障碍  false有障碍</returns>
        private bool IsObstacle(float dis)
        {
            if (attackRayCheck)
            {
                RaycastHit hit;
                Vector3 dir = target.Value.position - role.transform.position;
                dir.Normalize();

                bool isHit1 = Physics.Raycast(role.transform.position + Vector3.up + role.transform.right, dir, out hit, dis, 1 << LayerMask.NameToLayer("Stop"));
                bool isHit2 = Physics.Raycast(role.transform.position + Vector3.up - role.transform.right, dir, out hit, dis, 1 << LayerMask.NameToLayer("Stop"));
                if (isHit1 == false && isHit2 == false)
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }
            else
            {
                return false;
            }
        }

        public override void OnEnd()
        {
            base.OnEnd();
        }
    }
}