using GameWrapper.Curve;
using Sirenix.OdinInspector;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;

namespace GameWrapper.FlareLevel
{
    public sealed class FlareLevelCar : MonoBehaviour
    {
        /// <summary>
        /// 移动时间
        /// </summary>
        private const float MoveStepTime = 1f;

        #region 私有变量
        /// <summary>
        /// 当前位置
        /// </summary>
        private int curIndex;
        /// <summary>
        /// 下一个目标点位
        /// </summary>
        private BSplineCurve nextTarget;
        /// <summary>
        /// 目标位置
        /// </summary>
        private int targetIndex;
        /// <summary>
        /// 移动计时
        /// </summary>
        private float timer;
        /// <summary>
        /// 点位列表
        /// </summary>
        private List<GameObject> listPoint;
        #endregion

        /// <summary>
        /// 点位根节点
        /// </summary>
        public Transform TsPointRoot;

        private void Awake()
        {
            if (null == TsPointRoot)
            {
                listPoint = new List<GameObject>(1);
                return;
            }

            listPoint = new List<GameObject>(TsPointRoot.childCount);
            for (int i = 0; i < TsPointRoot.childCount; ++i)
            {
                listPoint.Add(TsPointRoot.GetChild(i).gameObject);
            }

            curIndex = -1;
            targetIndex = curIndex;
            SetPos(0);
        }

        private void Update()
        {
            if (curIndex == targetIndex)
                return;

            timer += Time.deltaTime;
            transform.position = nextTarget.GetPointOnCurve(timer / MoveStepTime);
            if (timer >= MoveStepTime)
            {
                curIndex = nextTarget.Index;
                MoveTo(targetIndex);
            }
        }

        /// <summary>
        /// 设置移动位置
        /// </summary>
        [Button]
        public void MoveTo(int index)
        {
            if (listPoint.Count <= index)
            {
                DebugUtil.LogError("设置移动点位越界");
                return;
            }

            if (index <= curIndex)
                return;

            targetIndex = index;
            GameObject goCur = listPoint[curIndex];
            nextTarget = goCur.GetComponent<BSplineCurve>();
            if (null == nextTarget)
            {
                DebugUtil.LogError($"点位没有挂载{nameof(BSplineCurve)}脚本");
                return;
            }

            timer = 0f;
        }

        /// <summary>
        /// 设置位置
        /// </summary>
        /// <param name="index"></param>
        [Button]
        public void SetPos(int index)
        {
            if (listPoint.Count <= index)
            {
                DebugUtil.LogError("设置移动点位越界");
                return;
            }

            if (curIndex == index)
                return;

            curIndex = index;
            targetIndex = curIndex;
            GameObject goTarget = listPoint[index];
            transform.position = goTarget.transform.position;
        }
    }
}