using System.Collections;
using UnityEngine;
using Mapbox.Unity.Map;
using Mapbox.Utils;
using Assets.Scripts.Apis.Models;
using static Assets.Scripts.Apis.Models.MapDataModel;
using System;
using Random = UnityEngine.Random;
using Assets.Scripts.Apis;
using GeoJSON.Net.Geometry;
using TurfCS;
using System.Linq;
using System.Collections.Generic;

namespace Assets.Scenes.Ride.Scripts
{
	public class PlayerController : MonoBehaviour
	{
		[Header("Character")]
		[SerializeField]
		GameObject character;
		[SerializeField]
		Animator characterAnimator;
		[SerializeField]
		AbstractMap map;

        #region 动画控制参数
        Vector3 nextPos;
		Vector3 prePos;
		Vector2d currentlatlong; //当前坐标
		Vector2d nextlatlong; //下一个点的坐标
		float timer = 1.0f;//计时器
		#endregion

		#region 选手骑行数据
		bool isStart;
		MapDataModel mapData;
		int userId;

		double speed;
		double power;
		double gradev;
		double elevation;
		double cadance;
		double heartRate;
		int ticks;
		double totalDistance;
		double currentSlope;
		double nextSlope;
		double nextSlopeDistance;
		double distance;

		public int UserId { get => userId; }
		public bool IsStart { get => isStart; }
		public double Speed { get => speed;  }
		public double Power { get => power; }
		public double Cadance { get => cadance; }
		public double HeartRate { get => heartRate; }
		public int TotalTicks { get => ticks; }
		public double TotalDistance { get => totalDistance;  }
		public double CurrentSlope { get => currentSlope; }
		public double NextSlope { get => nextSlope;}
		public double NextSlopeDistance { get => nextSlopeDistance; }
		public double Gradev { get => gradev; }
		public double Elevation { get => elevation; }
		#endregion

		void Start()
		{
			characterAnimator = GetComponentInChildren<Animator>();
			var mainController = transform.parent.GetComponent<MainController>();
			mapData = mainController.GetMapData();//获取路书信息
			InitializePlayer(mainController.GetCenterCoordinate());//初始人物
		}

		void Update()
		{
			timer -= Time.deltaTime;
			if (timer <= 0)//定时器 一秒执行一次
			{
				Run();
				timer = 1.0f;
			}
		}

		#region 骑行逻辑
		//当前人物骑行状态 true 开始 false 暂停
		public void SetStart(bool start)
		{
			isStart = start;
		}

		//初始化玩家距离/朝向
		void InitializePlayer(double[] coordinates)
		{
			ticks = 0;//当前骑行时间
			//初始化人物位置
			totalDistance = 10;//TODO:根据骑行模式动态取值
			currentlatlong = Along(totalDistance);//new Vector2d(coordinates[0], coordinates[1]);//当前坐标
			nextlatlong = currentlatlong;//下一秒坐标
			////初始化人物转向
			//var secondPlace = mapData.List[10].Point;
			//var secondVect3d = map.GeoToWorldPosition(	new Vector2d(secondPlace[0], secondPlace[1]));
			//Quaternion firstRotation = Quaternion.LookRotation(transform.localPosition - secondVect3d);
			//character.transform.rotation = Quaternion.Euler(0, firstRotation.eulerAngles.y, 0);
		}
		//骑行中
		void Run()
		{
			if (IsStart)
			{
				//CamControl();
				ComputeMapData();//计算海拔&坡度&下一个点信息
				power = 300;//功率
				speed = Helper.CalculateSpeed(elevation, gradev, power, 65, 7);
				distance = Math.Round(speed / 3600, 5);
				totalDistance += distance;
				characterAnimator.SetBool("IsRide", false);//初始化动画状态
				if (totalDistance <= mapData.TotalDistance)
				{
					ticks++;
					if (distance > 0)
					{
						characterAnimator.SetBool("IsRide", true);//开始移动动画
						nextlatlong = Along(totalDistance);//下一个坐标
						nextPos = map.GeoToWorldPosition(nextlatlong);//下一个点
						prePos = transform.localPosition;//当前点

						StartCoroutine(LookAtNextPos());//转向
						StartCoroutine(MoveTo());//移动
					}
				}
				else
				{
					//TODO保存骑行数据
				}
			}
			else
			{
				characterAnimator.SetBool("IsRide", false);
			}
		}

		//TODO：骑行结束
		void Finish()
		{
			//MapInterruptRecordApi api = new MapInterruptRecordApi();

			//api.Add(null, null);
		}
        #endregion

        #region 工具类
        //当前距离所在的海拔/坡度/距离 下一个点的坡度以及剩余距离
        void ComputeMapData()
		{
			double sumDistance = 0;
			var pointList = mapData.List;
			int index = 0;
			for (int i = 0; i < pointList.Count; i++)
            {
				sumDistance += pointList[i].Distance;
				if (totalDistance >= sumDistance)
				{
					index = i;
					break;
				}
			}
			//计算当前海拔和坡度
			elevation = pointList[index].Elevation;
			gradev = pointList[index].Grade;
			//计算下一个点的坡度和距离
			int nextIndex = index == pointList.Count - 1 ? index : index + 1;
			nextSlope = pointList[nextIndex].Grade;
			nextSlopeDistance = sumDistance + pointList[nextIndex].Distance - totalDistance;
		}
		//根据距离计算坐标
		Vector2d Along(double endDistance)
		{
			if (mapData != null)
			{
				var list = mapData.List.Select(p => new GeoJSON.Net.Geometry.GeographicPosition(p.Point[0], p.Point[1]));
				LineString lineString = new LineString(list);
				var pt1 = Turf.Along(lineString, endDistance);
				var ll = ((GeographicPosition)((GeoJSON.Net.Geometry.Point)pt1.Geometry).Coordinates);
				return new Vector2d(ll.Latitude, ll.Longitude);
			}
			return nextlatlong;
		}
        #endregion

        #region 人物移动与转向控制
        IEnumerator LookAtNextPos()
		{
			Quaternion neededRotation = Quaternion.LookRotation(transform.localPosition - nextPos);
			Quaternion thisRotation = character.transform.localRotation;

			float t = 0;
			while (t < 1.0f)
			{
				t += Time.deltaTime / 0.25f;
				var rotationValue = Quaternion.Slerp(thisRotation, neededRotation, t);
				character.transform.rotation = Quaternion.Euler(0, rotationValue.eulerAngles.y, 0);
				yield return null;
			}
		}

		//人物移动控制
		IEnumerator MoveTo()
		{
			//让人物移动分点增加动画的流畅度
			float t = 0;
			while (t < 1)
			{
				t += Time.deltaTime;
				Vector3 v = Vector3.Lerp(prePos, nextPos, t);
				transform.localPosition = v;
				yield return null;
			}
		}
		#endregion

		#region 相机控制
		[Header("CameraSettings")]
		[SerializeField]
		Camera cam;
		Vector3 previousPos = Vector3.zero;
		Vector3 deltaPos = Vector3.zero;

        IEnumerator CamControl()//TODO 替换成cinemachine
		{
			if (cam != null)
			{
				float t = 0;
				while (t < 1.0f)
				{
					t += Time.deltaTime / 0.5f;
					deltaPos = transform.position - previousPos;
					//deltaPos.y = 0;
					cam.transform.position = Vector3.Lerp(cam.transform.position, cam.transform.position + deltaPos, t);
					previousPos = transform.position;
					yield return null;
				}
			}
		}
		#endregion

	}
}