using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace BuildSystem
{
    public enum Dir { 
        none,up,down,left,right
    }
    public class Car : MonoBehaviour
    {
        private Vector2Int now;
        public bool isCanMove = true;
        public bool isMoveEnd = true;
        public List<Grid> passList = new List<Grid>();
        public Queue<Grid> moveRoad = new Queue<Grid>();//移动路径

        private void Start()
        {
            now = new Vector2Int(0, 2);
            moveRoad.Enqueue(RandomFindRoad(BuildSystemManager.Instance.gridMap[now.x][now.y]));
            moveRoad.Enqueue(RandomFindRoad(moveRoad.ToArray()[moveRoad.Count - 1]));
            StartCoroutine(StartMove());
        }

        private void Update()
        {
            if (moveRoad.Count < 3)
            {
                moveRoad.Enqueue(RandomFindRoad(moveRoad.ToArray()[moveRoad.Count - 1]));
            }
        }

        /// <summary>
        /// 随机寻找下一个路径
        /// </summary>
        /// <param name="grid"></param>
        Grid RandomFindRoad(Grid grid) {
            passList.Add(grid);
            Grid obj;
            while (true) {
                int rand = Random.Range(0, BuildSystemManager.Instance.gridMap[grid.x][grid.z].ground.Count);
                obj = BuildSystemManager.Instance.gridMap[grid.x][grid.z].ground[rand];
                if (!passList.Contains(obj)) {   
                    break;
                }
            }
            return obj;
        }


        /// <summary>
        /// 开启车辆移动
        /// </summary>
        /// <returns></returns>
        IEnumerator StartMove() {
            while (moveRoad.Count != 0) {
                yield return new WaitUntil(() => { return isMoveEnd;});
                isMoveEnd = false;
                Debug.Log(moveRoad);
                Grid grid = moveRoad.Dequeue();
                StartCoroutine(Move(grid));
            }
        }

        /// <summary>
        /// 车辆移动到目的点
        /// </summary>
        /// <param name="nextGird">下一个点的目标</param>
        /// <returns></returns>
        IEnumerator Move(Grid nextGird) {
            Grid nextnextGrid = moveRoad.ToArray()[moveRoad.Count - 1];
            List<Transform> roadPos = nextGird.placeObject.GetComponent<RoadInfo>().GetRoad(BuildSystemManager.Instance.gridMap[now.x][now.y], nextGird, nextnextGrid);
            isMoveEnd = false;
            for (int i = 0; i < roadPos.Count;)
            {
                while (true)
                {
                    yield return new WaitUntil(() => { return isCanMove; });
                    yield return new WaitForEndOfFrame();
                    Vector3 dir = (roadPos[i].position - transform.position).normalized;
                    transform.position += dir * Time.deltaTime * 10;
                    Quaternion quaternion = Quaternion.LookRotation(roadPos[i].position - transform.position);
                    transform.rotation = quaternion;
                    if (Vector3.Distance(transform.position, roadPos[i].position) <= 0.5f)
                    {
                        Debug.Log("到达");
                        i++;
                        break;
                    }
                }
            }
            now = new Vector2Int(nextGird.x, nextGird.z);
            Debug.Log("结束");
            isMoveEnd = true;
            
        }

        

    }
}