using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
/// <summary>
/// 车辆管理类
/// 功能：车辆生成
///      车辆AI
/// 
/// </summary>
public class CarSys : MonoBehaviour
{
 
    //计时器
    private float timer = 0f;
    //车辆种类列表
    public GameObject[] carTypeList;
    //已生成车辆列表
    //public List<GameObject> carList=new List<GameObject>(200);
    [HideInInspector]
    public Dictionary<int, GameObject> carList = new Dictionary<int, GameObject>();
    //
    public int CarID = 0;

    public bool canCreat = false;

    //移动点列表
    private Dictionary<string, Transform> MoveList = new Dictionary<string, Transform>();
    //生成点列表
    private Dictionary<string, Transform> BornList = new Dictionary<string, Transform>();


    public void Init()
    {
        CheckBornoint();
        CheckMovePoint();
        
    }


    #region CarAI
    //检索移动点
    public void CheckBornoint()
    {
        GameObject[] bornPoints = GameObject.FindGameObjectsWithTag("BornPoint");
        for (int i = 0; i < bornPoints.Length; i++)
        {
            BornList.Add(bornPoints[i].name, bornPoints[i].transform);

        }
    }

    //检索移动点
    public void CheckMovePoint()
    {
        GameObject[] moveObjs = GameObject.FindGameObjectsWithTag("MoveList");
        for (int i = 0; i < moveObjs.Length; i++)
        {
            MoveList.Add(moveObjs[i].name, moveObjs[i].transform);

        }
    }

    //车辆AI移动函数
    public IEnumerator CarMove(string lineName, NavMeshAgent agent)
    {
        if (lineName != "" && agent != null)
        {

            Transform moveListParent = null;
            MoveList.TryGetValue(lineName, out moveListParent);
            Drive drive = agent.GetComponent<Drive>();
            if (moveListParent != null)
            {
                Transform[] moveList = new Transform[moveListParent.childCount];
                //遍历移动列表
                for (int i = 0; i < moveListParent.childCount; i++)
                {
                    moveList[i] = moveListParent.GetChild(i);
                    //路径方向
                    Vector3 Dir = (moveList[i].transform.position - drive.transform.position).normalized;
                    if (moveList[i] != null)
                    {
                        float t = 0;
                        //向移动列表支点移动                    
                        agent.SetDestination(moveList[i].position);
                        //携程检测距离与路况
                        while (true)
                        {
                            //**********重要***********//
                            yield return new WaitForSeconds(0.02f);
                            drive.drivetime += Time.deltaTime;
                            //前方车辆安全距离检测
                            if (drive.drivetime > Const.SafeCheckTime)
                            {

                                drive.isnormalDrive = CheckFrontCar(drive) ? false : true;
                            }

                            if (drive.isnormalDrive == false)
                            {
                                agent.velocity = Vector3.zero;
                                continue;
                            }

                            float distance = Vector3.Distance(agent.transform.position, moveList[i].position);

                            //终点检测
                            if (distance <= 0.4f)
                            {
                                agent.velocity = Vector3.zero;
                                t = 0;
                                break;
                            }
                            //弯道减速
                            if (distance <= 20f && distance > 0.4f)
                            {

                                drive.dirveState = DriveState.Turn;
                                agent.velocity = Dir * 15;
                            }
                            else
                            {
                                drive.dirveState = DriveState.Line;
                                t += Time.deltaTime * Const.CarTurnSpeed;
                                agent.velocity = Vector3.Lerp(Vector3.zero, Dir * 20, t);
                            }



                        }
                    }

                }

                //回收车辆
                carList.Remove(drive.carId);
                Destroy(agent.gameObject);
                GameRoot.Instance.infoWnd.SetCarText(-1);
            }

        }


    }




    //检测前方车辆
    public bool CheckFrontCar(Drive drive)
    {
        if (drive.FrontCar == null) return false;

        if (Vector3.Distance(drive.transform.position, drive.FrontCar.transform.position) < Const.SafeDistance)
        {

            return true;
        }
        return false;
        #region MyRegion
        //for (int i = 0; i < carList.Count; i++)
        //{
        //    Vector3 target = carList[i].transform.position;
        //    Vector3 dir = target - drive.transform.position;
        //    drive.dot = Vector3.Dot(drive.transform.forward.normalized,dir.normalized);
        //    //判断是否前方有小于安全距离的车辆
        //    if (Vector3.Dot(drive.transform.forward.normalized, dir.normalized) > Mathf.Cos(Mathf.PI/6) && Vector3.Distance(target, drive.transform.position) <= Const.SafeDistance)
        //    {
        //        Debug.Log(drive.gameObject.name);
        //       return true;


        //    }
        //    else
        //    {
        //        continue;

        //    }


        //}
        //return false; 
        #endregion
    } 
    #endregion


    #region 汽车随机生成

    public void CreatCar(Transform parent)
    {
        // 随机创建车辆种类
        int carIndex = Random.Range(0, carTypeList.Length - 1);
        //实例化车辆
        GameObject car = GameObject.Instantiate(carTypeList[carIndex], parent.position, Quaternion.identity, parent);
        car.transform.localEulerAngles = parent.localEulerAngles;
        //car驾驶类赋值
        Drive drive = car.GetComponent<Drive>();
        drive.carId = CarID;
        carList.Add(CarID, drive.gameObject);
        CarID++;
        if (drive.carId != 0)
        {
            GameObject go = null;
            carList.TryGetValue(drive.carId - 1, out go);
            drive.FrontCar = go;
        }

        //统计数量更新
        GameRoot.Instance.infoWnd.SetCarText(1);//+1
                                                //执行寻路AI
        NavMeshAgent agent = car.GetComponent<NavMeshAgent>();
        if (agent != null)
        {
            StartCoroutine(CarMove(parent.name, agent));
        }
    }

    public IEnumerator RandomTimeCreat()
    {
        //随机获取出生点
        Transform parent = null;
        int pointIndex = Random.Range(1, BornList.Count);
        BornList.TryGetValue("0" + pointIndex.ToString(), out parent);
        if (parent != null)
        {
            //随机时间
            int t = Random.Range(Const.RefreshCarminTime, Const.RefreshCarmaxTime);
            Debug.Log(t);
            while (true)
            {
                yield return new WaitForEndOfFrame();
                timer += Time.deltaTime;

                if (timer >= t)
                {
                    timer = 0;
                    break;
                }


            }

            CreatCar(parent);

        }

        StartCoroutine(RandomTimeCreat());
    } 
    #endregion



}