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

namespace Sarand.BusinessMgr.Net.Standard.Base.App
{
	//=======================================================================
	public class SbmSysParamCache
	{
		//-------------------------------------------------------------------
		// Data members.
		protected readonly List<SbmSysParam> userSysParams = new List<SbmSysParam>();

		//-------------------------------------------------------------------
		// Protected Construction - use derived objects.
		public SbmSysParamCache(ISbmUserContext userContext)
		{
			this.UserContext = userContext;
		}

		//-------------------------------------------------------------------
		// Properties.
		public ISbmUserContext UserContext { get; }
		public SysId AffiliateIdUser { get; private set; }

		//-------------------------------------------------------------------
		/// <summary>Retrieve the value for the user parameter.</summary>
		public String GetParamValue(String name, SysId affiliateIdTarget = null, SysId associationId = null)
		{
			if (!SysId.IsValid(UserContext.User.AffiliateId)) return "";
			return GetParam(name, affiliateIdTarget, associationId)?.Value ?? "";
		}

		//-------------------------------------------------------------------
		/// <summary>Store value against user parameter.</summary>
		public bool SetSessionParam(String name, String value, SysId affiliateIdTarget = null, SysId associationId = null)
		{
			bool success = false;
			if (!SysId.IsValid(UserContext.User.AffiliateId)) return false;
			SbmSysParam sysParam = GetParam(name, affiliateIdTarget, associationId);
			if (sysParam != null)
			{
				// Update the value.
				sysParam.Value = value;
				success = true;
			}
			return success;
		}

		//-------------------------------------------------------------------
		/// <summary>Extract parameter from the cache list.</summary>
		private SbmSysParam FindParam(String name, SysId affiliateIdTarget = null, SysId associationId = null)
		{
			return userSysParams.Find
				(item => item.Category == Sbm.SysParamCategory.UserParam &&
				item.Name.EqualsCI(name) &&
				item.AffiliateIdOwner.Equals(UserContext.User.AffiliateId) &&
				SysId.ToInt(item.AffiliateIdTarget) == SysId.ToInt(affiliateIdTarget) &&
				SysId.ToInt(item.AssociationId) == SysId.ToInt(associationId));
		}
		/// <summary>Extract parameter from the cache list or retrieve from database if not present.</summary>
		private SbmSysParam GetParam(String name, SysId affiliateIdTarget = null, SysId associationId = null)
		{
			SbmSysParam sysParam = FindParam(name, affiliateIdTarget, associationId);
			if (sysParam == null)
			{
				using (SbmAccountMgr accountMgr = CreateAccountMgr())
				{
					// Retrieve a matching parameter from the database.
					sysParam = accountMgr.GetSysParam(Sbm.SysParamCategory.UserParam, name, UserContext.User.AffiliateId, affiliateIdTarget, associationId);
					if (sysParam == null)
					{
						// Parameter not found - create a new one.
						sysParam = accountMgr.CreateSysParam(Sbm.SysParamCategory.UserParam, name);
						if (sysParam != null)
						{
							sysParam.AffiliateIdOwner = UserContext.User.AffiliateId;
							sysParam.AffiliateIdTarget = affiliateIdTarget;
							sysParam.AssociationId = associationId;
						}
					}
					if (sysParam != null)
					{
						// Store parameter in the cache list.
						userSysParams.Add(sysParam);
					}
				}
			}
			return sysParam;
		}

		//-------------------------------------------------------------------
		/// <summary>Store the params cached for the current user.</summary>
		public bool Store()
		{
			String fn = GetType().Name + ".Store";
			bool success = true;
			using (SbmAccountMgr accountMgr = CreateAccountMgr())
			{
				foreach (SbmSysParam sysParam in userSysParams)
				{
					if (!SysId.IsValid(sysParam.Id))
					{
						// Parameter doesn't yet have a valid Id - create a new one.
						if (!accountMgr.InsertSysParam(sysParam, UserContext.DbUpdateInfo))
						{
							success = false;
							SaLogger.Warn(fn + " Failed to add parameter - " + accountMgr.ErrorStateMessage);
						}
					}
					else
					{
						// Parameter already has a valid Id - update it.
						if (!accountMgr.UpdateSysParam(sysParam, UserContext.DbUpdateInfo))
						{
							success = false;
							SaLogger.Warn(fn + " Failed to update parameter - " + accountMgr.ErrorStateMessage);
						}
					}
				}
			}
			return success;
		}

		//-------------------------------------------------------------------
		/// <summary>Clear the params cached for the current user.</summary>
		public void Clear()
		{
			AffiliateIdUser = null;
			ListUtil.ClearAndDispose(userSysParams);
		}

		//-------------------------------------------------------------------
		// Data managers.
		protected SbmAccountMgr CreateAccountMgr()
		{
			return SbmGlobals.System.CreateAccountMgr(UserContext);
		}

		//-------------------------------------------------------------------
	}
	//=======================================================================
}