using Newtonsoft.Json;
using OnlineUserPool.Unility;
using System;
using System.Collections.Generic;
using System.Text;

namespace OnlineUserPool.Model
{
    public class MapDataModel
    {
        public string Type => "LineString";
        /// <summary>
        /// 总距离(km)
        /// </summary>
        public double TotalDistance { get; set; }

        private List<Item> _List;
        public List<Item> List
        {
            get
            {
                return _List;
            }
            set
            {
                _List = value;
                if (_List == null) return;
                this.CalcDistance();
                this.CalcGrade();
            }
        }


        public void CalcDistance()
        {
            for (int i = 0; i < _List.Count - 1; i++)
            {
                var value = CommonHelper.GetDistances(_List[i].Point[1], _List[i].Point[0], _List[i + 1].Point[1], _List[i + 1].Point[0]);
                //var value = Turf.Distance(pt1, pt2, "kilometers") * 1000;
                _List[i].Distance = Math.Round(value, 2);
            }
        }
        /// <summary>
        /// 计算坡度数据
        /// </summary>
        private void CalcGrade()
        {
            for (int i = 0; i < this._List.Count - 1; i++)
            {
                var a = _List[i + 1].Elevation - _List[i].Elevation;
                if (a == 0)
                {
                    //grade.Add(0);
                    _List[i].Grade = 0;
                    continue;
                }
                //勾股定理
                var c = _List[i].Distance;//如果车停了下来，c为0
                if (c == 0 && i > 0)
                {
                    _List[i].Grade = _List[i - 1].Grade;
                }
                else
                {
                    var b = Math.Sqrt(c * c - a * a);
                    if (b == 0)//如果b等于，这就是垂直的墙壁
                    {
                        _List[i].Grade = _List[i - 1].Grade;
                    }
                    else
                    {
                        _List[i].Grade = Math.Round(a / b * 100, 4);
                    }
                }
            }
        }

        public MapDataModel()
        {
            //_List = new List<Item>();
        }

        public class Item
        {
            /// <summary>
            /// 坐标(lat,lon)
            /// </summary>
            public double[] Point { get; set; }
            /// <summary>
            /// 距离(单位米)
            /// </summary>
            [JsonIgnore]
            public double Distance { get; set; }
            /// <summary>
            /// 海拔m
            /// </summary>
            public double Elevation { get; set; }

            [JsonIgnore]
            public double Grade { get; set; }
        }
    }
}