using BehaviorDesigner.Runtime.Tasks;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
using BehaviorDesigner.Runtime.Tasks.EnemyAI;

namespace BehaviorDesigner.Runtime.Tasks
{
    [TaskDescription("近战警戒。前后游走")]
    [TaskCategory("YLSJ")]
    public class ActionSurroundAlert : NavMeshMovementBase
    {
        [Tooltip("围绕的目标")]
        public SharedTransform target;

        [Tooltip("警戒的最小总时间")]
        public SharedFloat alertMinTime = 6.0f;

        [Tooltip("警戒的最大总时间")]
        public SharedFloat alertMaxTime = 12.0f;

        [Tooltip("在当前位置后退的最小距离（比如攻击距离是2，后退的距离是1，怪物和人物之间的实际距离是2+1=3，实际距离不要超过alertDistance距离）")]
        public SharedFloat backMinDis = 1;
        [Tooltip("在当前位置后退的最大距离（比如攻击距离是2，后退的距离是3，怪物和人物之间的实际距离是2+3=5，实际距离不要超过alertDistance距离）")]
        public SharedFloat backMaxDis = 3;

        [Tooltip("警戒的最大范围，超过这个范围则进行追逐）")]
        public SharedFloat alertDistance = 6;

        [Tooltip("停留的最小时间(后退完成/围绕完成 都会停留一小段时间)")]
        public SharedFloat stayMinTime = 0.5f;
        [Tooltip("停留的最大时间(后退完成/围绕完成 都会停留一小段时间)")]
        public SharedFloat stayMaxTime = 1.0f;

        [Tooltip("围绕片断的最小时间")]
        public SharedFloat aroundFragmentMinTime = 2.0f;
        [Tooltip("围绕片断的最大时间")]
        public SharedFloat aroundFragmentMaxTime = 5.0f;

        [Tooltip("旋转速度(看向目标的旋转速度)")]
        public float rotationToTargetSpeed = 3;

        /// <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 float attackDistance = 0;

        /// <summary>
        /// 是否后退中
        /// </summary>
        private bool backing = true;

        /// <summary>
        /// 是否顺时针围绕
        /// </summary>
        private int clockwiseAround = 1;

        private float curAroundTotalTime = 0;
        private float curStayTime = 0;
        private float curAroundFragmentTime = 0;
        private float curBackDis = 0;

        private BehaviorTree behaviorTree = null;
        private Role role = null;
        private bool bSeek = false;


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

        public override void OnStart()
        {
            base.OnStart();

            liveAlertDistance = (float)behaviorTree.GetVariable("liveAlertDistance").GetValue();
            attackDistance = (float)behaviorTree.GetVariable("attackDistance").GetValue();

            curAroundTotalTime = Random.Range(alertMinTime.Value, alertMaxTime.Value);
            backing = true;
            bSeek = false;
            m_NavMeshAgent.component.updateRotation = false;//禁用旋转
            m_NavMeshAgent.component.isStopped = false;

            Vector3 dir = target.Value.position - m_NavMeshAgent.component.transform.position;
            dir.Normalize();

            curBackDis = Random.Range(backMinDis.Value, backMaxDis.Value);
            Vector3 backPos = m_NavMeshAgent.component.transform.position - dir * curBackDis;
            SetDestination(backPos);
        }

        public override TaskStatus OnUpdate()
        {
            // 目标死亡
            if (target.Value == null)
            {
                return TaskStatus.Success;
            }

            // 时间到达
            curAroundTotalTime -= time.deltaTime;
            if (curAroundTotalTime <= 0)
            {
                return TaskStatus.Success;
            }

            float liveDis = Vector3.Distance(transform.position, role.mLivePos);
            float targetDis = Vector3.Distance(transform.position, target.Value.position);
            // 超出出生地活动范围
            if (liveDis > liveAlertDistance)
            {
                return TaskStatus.Success;
            }

            Vector3 centerPos = target.Value.position;
            Vector3 dir = transform.position - centerPos;
            float dis = Vector3.Distance(transform.position, centerPos);
            dir.Normalize();
            dir.y = 0;
         
            // 超出 警戒范围
            if (targetDis > alertDistance.Value)
            {
                backing = false;
                bSeek = true;
                m_NavMeshAgent.component.updateRotation = true;
                m_NavMeshAgent.component.speed = (float)behaviorTree.GetVariable("runSpeed").GetValue();
            }

            // 停留期间不做任何处理
            if (curStayTime > 0)
            {
                if (m_NavMeshAgent.component.isOnNavMesh && m_NavMeshAgent.component.isStopped != true)
                {
                    m_NavMeshAgent.component.isStopped = true;
                }

                curStayTime -= time.deltaTime;

                return TaskStatus.Running;
            }
            else
            {
                if (m_NavMeshAgent.component.isOnNavMesh && m_NavMeshAgent.component.isStopped != false)
                {
                    m_NavMeshAgent.component.isStopped = false;
                }
            }

            // 后退
            if (backing)
            {
                if (HasArrived())
                {
                    backing = false;
                    ResetAround();
                }
            }
            // 围绕目标
            else
            {
                if (bSeek == false)
                {
                    // 旋转
                    transform.rotation = Quaternion.Lerp(transform.rotation, Quaternion.LookRotation(-dir), rotationToTargetSpeed * Time.deltaTime);

                    curAroundFragmentTime -= time.deltaTime;
                    if (curAroundFragmentTime > 0)
                    {
                        Vector3 aroundPos = target.Value.position + dir * dis + transform.right * clockwiseAround;
                        SetDestination(aroundPos);
                    }
                    else
                    {
                        ResetAround();
                    }
                }
                else
                {
                    if (targetDis > curBackDis + attackDistance)
                    {
                        Vector3 targetDir = target.Value.position - m_NavMeshAgent.component.transform.position;
                        targetDir.Normalize();

                        SetDestination(target.Value.position + targetDir * (curBackDis + attackDistance));
                    }
                    else
                    {
                        bSeek = false;
                        m_NavMeshAgent.component.updateRotation = false;
                        m_NavMeshAgent.component.speed = (float)behaviorTree.GetVariable("moveSpeed").GetValue();
                    }
                }
            }

            return TaskStatus.Running;
        }

        /// <summary>
        /// 重置围绕
        /// </summary>
        private void ResetAround()
        {
            int clockwiseRan = Random.Range(0, 2);
            if (clockwiseRan == 0)
            {
                clockwiseAround = -1;
            }
            else
            {
                clockwiseAround = 1;
            }
            curStayTime = Random.Range(stayMinTime.Value, stayMaxTime.Value);
            curAroundFragmentTime = Random.Range(aroundFragmentMinTime.Value, aroundFragmentMaxTime.Value);
        }

        public override void OnEnd()
        {
            base.OnEnd();
            if (m_NavMeshAgent.component != null && m_NavMeshAgent.component.isOnNavMesh && role.isDie == false)
            {
                m_NavMeshAgent.component.isStopped = true;
                m_NavMeshAgent.component.updateRotation = true;
            }
        }
    }
}