using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TrainInfomationProviderService.StationInfo;
using TrainInfomationProviderService.StationInfo.Entities;

namespace TrainInfomationProviderService.TrainInfo.Entities
{
	public class TrainLineSegment
	{
		StationDetailInfo _toStation;
		StationDetailInfo _fromStation;
		TimeSpan? _elapsedTime;

		public Train Train { get; private set; }

		public TrainStop From { get; private set; }

		public TrainStop To { get; private set; }

		public StationDetailInfo FromStation
		{
			get
			{
				if (_fromStation == null)
					_fromStation = StationManager.Instance.Storage.Stations.GetValue(From.Code);
				return _fromStation;
			}
		}

		public StationDetailInfo ToStation
		{
			get
			{
				if (_toStation == null)
					_toStation = StationManager.Instance.Storage.Stations.GetValue(To.Code);
				return _toStation;
			}
		}

		/// <summary>
		/// 历时
		/// </summary>
		public TimeSpan ElapsedTime
		{
			get
			{
				if (_elapsedTime == null)
					_elapsedTime = To.Arrive - From.Left;
				return _elapsedTime ?? TimeSpan.Zero;
			}
		}

		int? _calculatedMinutesBase;

		/// <summary>
		/// 进行时间对比的基础分钟数
		/// </summary>
		public int CalculatedMinutesBase
		{
			get
			{
				if (_calculatedMinutesBase == null)
				{
					var minutes = ElapsedTime.TotalMinutes;
					var rate = 1.0;
					switch (Train.TrainClass)
					{
						case 'G':
							rate = 1.0;
							break;
						case 'D':
							rate = 0.71428;
							break;
						case 'Z':
							rate = 0.45714;
							break;
						case 'T':
							rate = 0.4;
							break;
						default:
							rate = 0.28571;
							break;
					}
					_calculatedMinutesBase = (int)(rate*minutes);
				}
				return _calculatedMinutesBase ?? 0;
			}
		}

		/// <summary>
		/// 创建 <see cref="TrainLineSegment" />  的新实例(TrainLineSegment)
		/// </summary>
		/// <param name="train"></param>
		/// <param name="from"></param>
		/// <param name="to"></param>
		public TrainLineSegment(Train train, TrainStop from, TrainStop to)
		{
			Train = train;
			From = from;
			To = to;
		}


	}
}