using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;

namespace TrainInfomationProviderService.StationInfo.Entities
{
	public class SameStationCollection : List<HashSet<string>>
	{
		private SameStationCollection()
		{
			
		}

		public HashSet<string> FindSameStations(string code)
		{
			return this.FirstOrDefault(s => s.Contains(code));
		}

		private static SameStationCollection _instance;
		private static readonly object _lockObject = new object();

		/// <summary>
		/// 获得实例对象
		/// </summary>
		public static SameStationCollection Instance
		{
			get
			{
				if (_instance == null)
				{
					lock (_lockObject)
					{
						if (_instance == null)
						{
							var file = Path.Combine(RunTimeContext.DataStorageRoot, "samestation.json");
							if (File.Exists(file))
							{
								_instance = JsonConvert.DeserializeObject<SameStationCollection>(File.ReadAllText(file));
							}
							else
							{
								_instance = new SameStationCollection();
							}
						}
					}
				}

				return _instance;
			}
		}
	}
}