namespace TINK.ViewModel.Bikes
{
	/// Holds the view context in which a view model is used.
	public class ViewContext
	{
		/// <summary>
		/// Constructs object.
		/// </summary>
		/// <param name="page">Value identifying the page to which view model relates to.</param>
		/// <param name="stationId">Holds the id of the station if related page is <see cref="PageContext.BikesAtStation"/> ignored otherwise.</param>
		public ViewContext(PageContext page, string stationId = null) {
			Page = page;
			if (page != PageContext.BikesAtStation)
			{
				// Station id must not contain a value if view context is not bikes at station page.
				return;
			}

			StationId = stationId ?? string.Empty;
		}

		/// <summary>
		/// Holds the page to which view model is related to.
		/// </summary>
		public PageContext Page { get; }

		/// <summary>
		/// Holds the id of the station if related page is <see cref="PageContext.BikesAtStation"/> empty otherwise.
		/// </summary>
		public string StationId { get; } = string.Empty;
	}


	/// <summary>
	/// Holds the view context in which bikes view model is used.
	/// </summary>
	public enum PageContext
	{
		/// <summary> Context is bikes at station page. </summary>
		BikesAtStation,
		/// <summary> Context is find bike page. </summary>
		FindBike,
		/// <summary> Context is my bikes page. </summary>
		MyBikes
	}
}