using System;
using System.Collections.Generic;
using Sarand.Net.Standard.Base.Core;
using Sarand.Net.Standard.Base.Bus;
using Sarand.Net.Standard.Base.Utils;

namespace Sarand.Net.Standard.Base.Security
{
	//=======================================================================
	public abstract class SaSecurityLink : SacsHierarchyItem
	{
		//-------------------------------------------------------------------
		// Columns.
		public enum Column
		{
			Pos = 0,
			ItemIdOwner,
			ItemOwner_Code,
			ItemOwner_Desc,
			ItemIdTarget,
			ItemTarget_Code,
			ItemTarget_Desc,
			ItemIdContext,
			ItemContext_Desc,
			DaysApplicable,
			DateApplicableFrom,
			DateApplicableTo,
			Granted_Y,
			Denied_X,
			Status,
			Status_Ind,
			Status_Desc,
			CreateOn_Date,
			UpdateOn_Date,
		}

		//-------------------------------------------------------------------
		/// <summary>Properties other than common.</summary>
		public class DataProperties
		{
			public SysId ItemIdOwner { get; set; } = new SysId();
			public SysId ItemIdTarget { get; set; } = new SysId();
			public SysId ItemIdContext { get; set; } = new SysId();
			public String DayApplicability { get; set; } = String.Empty;
			public DateTime? ApplicableFrom { get; set; } = DateTime.MinValue;
			public DateTime? ApplicableTo { get; set; } = DateTime.MinValue;
		}

		//-------------------------------------------------------------------
		// Data.
		public new class Data : SacsHierarchyItem.Data
		{
			// Data members.
			private readonly DataProperties data = new DataProperties();
			// Construction.
			public Data()
			{
				Status = DefaultStatus;
			}
			// Properties.
			public SysId ItemIdOwner
			{
				get { return data.ItemIdOwner; }
				set { CheckChanged(data.ItemIdOwner, value); data.ItemIdOwner = value; }
			}
			public SysId ItemIdTarget
			{
				get { return data.ItemIdTarget; }
				set { CheckChanged(data.ItemIdTarget, value); data.ItemIdTarget = value; }
			}
			public SysId ItemIdContext
			{
				get { return data.ItemIdContext; }
				set { CheckChanged(data.ItemIdContext, value); data.ItemIdContext = value; }
			}
			public String DayApplicability
			{
				get { return data.DayApplicability; }
				set { CheckChanged(data.DayApplicability, value); data.DayApplicability = value; }
			}
			public DateTime? ApplicableFrom
			{
				get { return data.ApplicableFrom; }
				set { CheckChangedNullable(data.ApplicableFrom, value); data.ApplicableFrom = value; }
			}
			public DateTime? ApplicableTo
			{
				get { return data.ApplicableTo; }
				set { CheckChangedNullable(data.ApplicableTo, value); data.ApplicableTo = value; }
			}
			// Population.
			internal void PopulateFrom(Data data)
			{
				ItemIdOwner = data.ItemIdOwner;
				ItemIdTarget = data.ItemIdTarget;
				ItemIdContext = data.ItemIdContext;
				DayApplicability = data.DayApplicability;
				ApplicableFrom = data.ApplicableFrom;
				ApplicableTo = data.ApplicableTo;
				base.PopulateFrom(data);
			}
			public Data Clone()
			{
				Data data = new Data();
				data.PopulateFrom(this);
				return data;
			}
		}

		//-------------------------------------------------------------------
		// Error field - identify properties with validation error.
		public new class ErrField : SacsHierarchyItem.ErrField
		{
			// Identifies the field that has invalid data.
			public ValidValue ItemIdOwner { get; set; } = ValidValue.Valid;
			public ValidValue ItemIdTarget { get; set; } = ValidValue.Valid;
			public ValidValue ItemIdContext { get; set; } = ValidValue.Valid;
			public ValidValue DayApplicability { get; set; } = ValidValue.Valid;
			public ValidValue ApplicableFrom { get; set; } = ValidValue.Valid;
			public ValidValue ApplicableTo { get; set; } = ValidValue.Valid;
		}

		//-------------------------------------------------------------------
		// Data members.
		private readonly Data data = new Data();

		//-------------------------------------------------------------------
		// Construction.
		public SaSecurityLink(SysId itemIdOwner, SysId itemIdTarget, SysId itemIdContext) :
			base()
		{
			base.SetData(data);
			ItemIdOwner = itemIdOwner;
			ItemIdTarget = itemIdTarget;
			ItemIdContext = itemIdContext;
			Status = DefaultStatus;
		}

		//-------------------------------------------------------------------
		// Status.
		private static readonly List<SaStatus> securityLinkStatuses = new List<SaStatus>()
		{
			SaStatus.Granted,
			SaStatus.Denied,
		};
		public static SaStatus DefaultStatus { get { return GrantedStatus; } }
		public static SaStatus GrantedStatus { get { return SaStatus.Granted; } }
		public static SaStatus DeniedStatus { get { return SaStatus.Denied; } }
		public static List<SaStatus> ValidStatuses { get { return new List<SaStatus>(securityLinkStatuses); } }
		public static DataValue.TriStateType GetStatusTriState(SaStatus status)
		{
			switch (status)
			{
				case SaStatus.Granted:
					return DataValue.TriStateType.Green;
				case SaStatus.Denied:
					return DataValue.TriStateType.Red;
				case SaStatus.Deleted:
					return DataValue.TriStateType.Purple;
			}
			return DataValue.TriStateType.Unknown;
		}

		//-------------------------------------------------------------------
		// Properties.
		public Data GetData() { return data.Clone(); }
		public void SetData(Data data)
		{
			// Properties that cannot be changed if previously specified.
			if (SysId.IsValid(data.Id))
				throw new NotSupportedException($"{SysUtil.Fn} Id is not applicable for security links");
			if (SysId.IsValid(data.ItemIdOwner) && SysId.ToInt(data.ItemIdOwner) != SysId.ToInt(ItemIdOwner))
				throw new NotSupportedException($"{SysUtil.Fn} Owner Item cannot be changed");
			if (SysId.IsValid(data.ItemIdTarget) && SysId.ToInt(data.ItemIdTarget) != SysId.ToInt(ItemIdTarget))
				throw new NotSupportedException($"{SysUtil.Fn} Target Item cannot be changed");
			// Populate individual properties to ensure that 'Changed' indicator is kept up to date.
			this.data.PopulateFrom(data);
		}

		//-------------------------------------------------------------------
		// Properties.
		public override bool ItemHasId() { return false; }
		public SysId ItemIdOwner
		{
			get { return data.ItemIdOwner; }
			protected set { data.ItemIdOwner = value; }
		}
		public SysId ItemIdTarget
		{
			get { return data.ItemIdTarget; }
			protected set { data.ItemIdTarget = value; }
		}
		public SysId ItemIdContext
		{
			get { return data.ItemIdContext; }
			protected set { data.ItemIdContext = value; }
		}
		public String DayApplicability
		{
			get { return data.DayApplicability; }
			set { data.DayApplicability = value; }
		}
		public DateTime? ApplicableFrom
		{
			get { return data.ApplicableFrom; }
			set { data.ApplicableFrom = value; }
		}
		public DateTime? ApplicableTo
		{
			get { return data.ApplicableTo; }
			set { data.ApplicableTo = value; }
		}

		//-------------------------------------------------------------------
		// List parameters.
		public enum StatusCat
		{
			Any,
			GrantedOnly,
			DeniedOnly,
		}
		/// <summary>
		/// Item list parameters.
		/// </summary>
		public new class Params : SacsHierarchyItem.Params
		{
			public readonly HashSet<SysId> ItemIdsOwnerIncluded = new HashSet<SysId>();
			public SaSecurity.ItemType OwnerItemType { get; set; } = SaSecurity.ItemType.Unknown;
			public readonly HashSet<SysId> ItemIdsTargetIncluded = new HashSet<SysId>();
			public SaSecurity.ItemType TargetItemType { get; set; } = SaSecurity.ItemType.Unknown;
			public readonly HashSet<SysId> ItemIdsContextIncluded = new HashSet<SysId>();
			public StatusCat StatusCat { get; set; } = StatusCat.Any;
		}

		//-------------------------------------------------------------------
	}
	//=======================================================================
	public static class SaSecurityLinkList
	{
		//-------------------------------------------------------------------
		// Link owner.
		public static bool ContaineOwnerItemId(this List<SaSecurityLink> links, SysId itemIdOwner)
		{
			if (!SysId.IsValid(itemIdOwner)) return false;
			SaSecurityLink secLink = links.Find(link => SysId.IsValid(link.ItemIdOwner) && link.ItemIdOwner.Equals(itemIdOwner));
			return (secLink != null);
		}
		public static List<SysId> GetOwnerItemIds(this List<SaSecurityLink> links)
		{
			List<SysId> ownerItemIds = new List<SysId>();
			foreach (SaSecurityLink secLink in links)
			{
				if (SysId.IsValid(secLink.ItemIdOwner) && !ownerItemIds.Contains(secLink.ItemIdOwner))
					ownerItemIds.Add(secLink.ItemIdOwner);
			}
			return ownerItemIds;
		}
		//-------------------------------------------------------------------
		// Link target.
		public static bool ContainsTargetItemId(this List<SaSecurityLink> links, SysId itemIdTarget)
		{
			if (!SysId.IsValid(itemIdTarget)) return false;
			SaSecurityLink secLink = links.Find(link => SysId.IsValid(link.ItemIdTarget) && link.ItemIdTarget.Equals(itemIdTarget));
			return (secLink != null);
		}
		public static List<SysId> GetTargetItemIds(this List<SaSecurityLink> links)
		{
			List<SysId> targetItemIds = new List<SysId>();
			foreach (SaSecurityLink secLink in links)
			{
				if (SysId.IsValid(secLink.ItemIdTarget) && !targetItemIds.Contains(secLink.ItemIdTarget))
					targetItemIds.Add(secLink.ItemIdTarget);
			}
			return targetItemIds;
		}
		public static SaStatus GetStatusByTargetItemId(this List<SaSecurityLink> links, SysId itemIdTarget)
		{
			if (!SysId.IsValid(itemIdTarget)) return SaStatus.Unknown;
			SaSecurityLink secLink = links.Find(link => SysId.IsValid(link.ItemIdTarget) && link.ItemIdTarget.Equals(itemIdTarget));
			return (secLink != null ? secLink.Status : SaStatus.Unknown);
		}
		//-------------------------------------------------------------------
	}

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