using System;
using ShareeBike.Model.Device;
using ShareeBike.Model.Services.CopriApi;
using ShareeBike.Repository;

namespace ShareeBike.Model.Connector
{
	/// <summary>
	/// Connects app to copri data by getting data from copri.
	/// </summary>
	public class Connector : IConnector
	{
		/// <summary>Constructs a copri connector object to connect to copri by https with cache fall back.</summary>
		/// <param name="activeUri"> Uri to connect to.</param>
		/// <param name="appContextInfo">Provides app related info (app name and version, merchant id) to pass to COPRI.</param>
		/// <param name="uiIsoLangugageName">Two letter ISO language name.</param>
		/// <param name="sessionCookie"> Holds the session cookie.</param>
		/// <param name="mail">Mail of user.</param>
		/// <param name="smartDevice">Holds info about smart device.</param>
		/// <param name="expiresAfter">Timespan which holds value after which cache expires.</param>
		/// <param name="server"> Is null in production and might be a mock in testing context.</param>
		public Connector(
			Uri activeUri,
			AppContextInfo appContextInfo,
			string uiIsoLangugageName,
			string sessionCookie,
			string mail,
			ISmartDevice smartDevice = null,
			TimeSpan? expiresAfter = null,
			ICachedCopriServer server = null)
		{
			var cachedServer = server ?? new CopriProviderHttps(
					activeUri,
					appContextInfo.MerchantId,
					appContextInfo,
					uiIsoLangugageName,
					smartDevice,
					sessionCookie,
					expiresAfter);

			Command = CreateCommand(
				cachedServer,
				sessionCookie,
				mail);

			Query = CreateQuery(
				cachedServer,
				sessionCookie,
				mail);
		}

		/// <summary> Object for querying stations and bikes.</summary>
		public ICommand Command { get; private set; }

		/// <summary> Object for querying stations and bikes.</summary>
		public IQuery Query { get; private set; }

		/// <summary> True if connector has access to copri server, false if cached values are used. </summary>
		public bool IsConnected => Command.IsConnected;

		/// <summary> Creates a command object to perform copri commands. </summary>
		public static ICommand CreateCommand(ICopriServerBase copri, string sessioncookie, string mail) => string.IsNullOrEmpty(sessioncookie)
							? new Command(copri)
							: new CommandLoggedIn(copri, sessioncookie, mail, () => DateTime.Now) as ICommand;

		/// <summary> Creates a command object to perform copri queries. </summary>
		private static IQuery CreateQuery(ICachedCopriServer copri, string sessioncookie, string mail) => string.IsNullOrEmpty(sessioncookie)
							? new CachedQuery(copri) as IQuery
							: new CachedQueryLoggedIn(copri, sessioncookie, mail, () => DateTime.Now);
	}
}