using System;

namespace TINK.Settings
{
	/// <summary> Holds polling parameters.</summary>
	public sealed class PollingParameters : IEquatable<PollingParameters>
	{
		/// <summary> Holds default polling parameters. </summary>
		public static PollingParameters Default { get; } = new PollingParameters(
			new TimeSpan(0, 0, 0, 60 /*secs*/, 0), // Default polling interval. Was 10 secs up to 3.0.357.
			true);

		/// <summary> Holds polling parameters which represent polling off (empty polling object). </summary>
		public static PollingParameters NoPolling { get; } = new PollingParameters(
			TimeSpan.MaxValue,// Very long intervall which should never be used because polling IsActivated property is set to false.
			false);

		/// <summary> Constructs a polling parameter object. </summary>
		/// <param name="period">Polling period.</param>
		/// <param name="activated">True if polling is activated.</param>
		public PollingParameters(TimeSpan period, bool activated)
		{
			Periode = period; // Can not be null because is a struct.
			IsActivated = activated;
		}

		/// <summary>Holds the polling period.</summary>
		public TimeSpan Periode { get; }

		/// <summary> Holds value whether polling is activated or not.</summary>
		public bool IsActivated { get; }

		/// <summary> Checks equallity.</summary>
		/// <param name="other">Object to compare with.</param>
		/// <returns>True if objects are equal.</returns>
		public bool Equals(PollingParameters other)
		{
			return this == other;
		}

		/// <summary> Checks equallity.</summary>
		/// <param name="obj">Object to compare with.</param>
		/// <returns>True if objects are equal.</returns>
		public override bool Equals(object obj)
		{
			var l_oParameters = obj as PollingParameters;
			if (l_oParameters == null)
			{
				return false;
			}

			return this == l_oParameters;
		}

		/// <summary> Gets the has code of object.</summary>
		/// <returns></returns>
		public override int GetHashCode()
		{
			return Periode.GetHashCode() ^ IsActivated.GetHashCode();
		}

		/// <summary> Gets the string representation of the object.</summary>
		/// <returns></returns>
		public override string ToString()
		{
			return $"Polling is on={IsActivated}, polling interval={Periode.TotalSeconds}[sec].";
		}

		/// <summary>Defines equality of thwo polling parameter objects.</summary>
		/// <param name="p_oSource">First object to compare.</param>
		/// <param name="p_oTarget">Second object to compare.</param>
		/// <returns>True if objects are equal</returns>
		public static bool operator ==(PollingParameters p_oSource, PollingParameters p_oTarget)
		{
			if (p_oSource is null && p_oTarget is null)
			{
				// Both object are null
				return true;
			}

			if (p_oSource is null ^ p_oTarget is null)
			{
				// Only one object is null.
				return false;
			}

			return p_oSource.Periode == p_oTarget.Periode
				&& p_oSource.IsActivated == p_oTarget.IsActivated;
		}

		/// <summary>Defines equality of thwo polling parameter objects.</summary>
		/// <param name="p_oSource">First object to compare.</param>
		/// <param name="p_oTarget">Second object to compare.</param>
		/// <returns>True if objects are equal</returns>
		public static bool operator !=(PollingParameters p_oSource, PollingParameters p_oTarget)
		{
			return (p_oSource == p_oTarget) == false;
		}
	}
}