using Sarand.Net.Standard.Base.Utils;
using System;

namespace Sarand.Net.Standard.Base.Core
{
	//=======================================================================
	/// <summary>State Item interface.</summary>
	public interface ISacsStateItem
	{
		bool HasErrorState();
		SacsErrorState ErrorState { get; }
		String ErrorStateMessage { get; }
		bool SetErrorState(String message);
		void ClearErrorState();
	}

	//=======================================================================
	/// <summary>
	/// State Item - allows business component to record and report error message.
	/// </summary>
	public class SacsStateItem : ISacsStateItem
	{
		//-------------------------------------------------------------------
		// Data items.

		//-------------------------------------------------------------------
		// Protected construction - use derived classes.
		protected SacsStateItem() { }

		//-------------------------------------------------------------------
		// Poperties.

		/// <summary>OK - No error state message.</summary>
		public bool OK { get { return !HasErrorState(); } }

		// Error state.
		public SacsErrorState ErrorState { get; private set; }
		public bool HasErrorState()
		{
			return ErrorState != null;
		}
		public String ErrorStateMessage
		{
			get { return (ErrorState != null ? ErrorState.Message : String.Empty); }
		}
		// Update properties.
		public virtual bool SetErrorState(String message)
		{
			if (StringUtil.IsEmpty(StringUtil.EmptyOnNull(message).Trim()))
				throw new NotSupportedException($"{SysUtil.Fn} Blank error message.");
			this.ErrorState = new SacsErrorState(message);
			return false;
		}
		public void ClearErrorState()
		{
			ErrorState = null;
		}

		//-------------------------------------------------------------------
	}

	//=======================================================================
}