using Sarand.BusinessMgr.Net.Standard.Base.App;
using Sarand.BusinessMgr.Net.Standard.Base.Bus;
using Sarand.BusinessMgr.Net.Standard.Base.Core;
using Sarand.Net.Standard.Base.App;
using Sarand.Net.Standard.Base.Bus;
using Sarand.Net.Standard.Base.CodeTypes;
using Sarand.Net.Standard.Base.Core;
using Sarand.Net.Standard.Base.Dbas;
using Sarand.Net.Standard.Base.Interfaces;
using Sarand.Net.Standard.Base.ItemDocs;
using Sarand.Net.Standard.Base.ItemOptions;
using Sarand.Net.Standard.Base.ReferenceData;
using Sarand.Net.Standard.Base.Security;
using Sarand.Net.Standard.Base.UpdateLog;
using Sarand.Net.Standard.Base.Utils;
using System;
using System.Collections.Generic;
using System.Linq;

namespace Sarand.BusinessMgr.Net.Standard.Base.Mgr
{
	//=======================================================================
	public abstract class SbmItemMgr : SacsItemMgr
	{
		//-------------------------------------------------------------------
		// System code cache.
		/// <summary>Central repository for system codes used by manager.</summary>
		private class SystemCodeCache
		{
			public SystemCodeCache(ISbmUserContext userContext)
			{
				this.userContext = userContext;
			}
			private readonly ISbmUserContext userContext;
			private Dictionary<Sbm.SystemCode, List<TypeCodeDesc>> systemCodes = new Dictionary<Sbm.SystemCode, List<TypeCodeDesc>>();
			public List<TypeCodeDesc> GetCodesOfType(Sbm.SystemCode systemCode)
			{
				if (!systemCodes.ContainsKey(systemCode))
					systemCodes[systemCode] = SbmSystem.GetCodesOfType(userContext, systemCode);
				return new List<TypeCodeDesc>(systemCodes.GetValue(systemCode, new List<TypeCodeDesc>()));
			}
		}

		//-------------------------------------------------------------------
		// Code type cache.
		public class CodeTypeCache
		{
			/// <summary>
			/// Cached codes by code type.
			/// <para>NB Likely to only contain a subset of code types depending on context.</para>
			/// </summary>
			private Dictionary<String, List<SaCode>> codesByCodeType { get; }
			// Construction.
			public CodeTypeCache(Dictionary<String, List<SaCode>> codes)
			{
				codesByCodeType = codes;
			}
			/// <summary>Are there any codes of the specified type.</summary>
			public bool CodeTypeHasCodes(Sbm.ApplCodeType codeType)
			{
				String codeTypeCode = SbmSystem.GetCodeTypeCode(codeType);
				return codesByCodeType.ContainsKey(codeTypeCode)
					? codesByCodeType[codeTypeCode].Count > 0
					: false;
			}
			/// <summary>Get the description for the code belonging to the specified code type.</summary>
			public String GetDescForCodeTypeCode(Sbm.ApplCodeType codeType, String code, bool defaultToCode = true)
			{
				List<SaCode> codes = GetCodesForCodeType(codeType, false);
				return codes?.GetDescForCode(code, defaultToCode ? code : "") ?? "";
			}
			/// <summary>Retrieve codes for specified code type.</summary>
			public List<SaCode> GetCodesForCodeType(Sbm.ApplCodeType codeType, bool activeOnly = true)
			{
				String codeTypeCode = SbmSystem.GetCodeTypeCode(codeType);
				return codesByCodeType.ContainsKey(codeTypeCode)
					? new List<SaCode>(codesByCodeType[codeTypeCode].FindAll(code => !activeOnly || code.Status == SaCode.ActiveStatus))
					: null;
			}
			/// <summary>Retrieve code descs for specified code type.</summary>
			public List<CodeDesc> GetCodeDescsForCodeType(Sbm.ApplCodeType codeType, bool activeOnly = true)
			{
				String codeTypeCode = SbmSystem.GetCodeTypeCode(codeType);
				return codesByCodeType.ContainsKey(codeTypeCode)
					? new List<CodeDesc>(codesByCodeType[codeTypeCode].FindAll(code => !activeOnly || code.Status == SaCode.ActiveStatus).Select(code => new CodeDesc(code.Code, code.Description)))
					: null;
			}
		}

		//-------------------------------------------------------------------
		// Data members.
		private SbmInternals internals;
		private readonly SystemCodeCache systemCodeCache;
		private readonly List<TypeCodeDesc> currencyCodes;
		private List<SaCurrency> currencies;
		private List<SaLanguage> languages;
		private List<SaRegion> regions;
		private List<SaTaxCode> taxCodes;
		private List<SaUnitMeasure> unitsOfMeasure;

		//-------------------------------------------------------------------
		// Static initialisation.
		static SbmItemMgr()
		{
		}

		//-------------------------------------------------------------------
		// Construction. 
		protected SbmItemMgr(ISbmUserContext userContext)
		{
			if (userContext == null)
				throw new NotSupportedException("SbmItemMgr User context must be supplied");
			UserContext = userContext;
			ElapsedLogger = new ElapsedTimeLogger(GetType().Name);
			systemCodeCache = new SystemCodeCache(userContext);
			// Numeric formatting values.
			WeightDecimals = UserContext.GetOwnerOption_NumericDecimals(Sbm.OrgOption_NumericDecimals.CommodityWeight);
			LengthDecimals = UserContext.GetOwnerOption_NumericDecimals(Sbm.OrgOption_NumericDecimals.CommodityLength);
			VolumeDecimals = UserContext.GetOwnerOption_NumericDecimals(Sbm.OrgOption_NumericDecimals.CommodityVolume);
			DensityDecimals = UserContext.GetOwnerOption_NumericDecimals(Sbm.OrgOption_NumericDecimals.CommodityDensity);
			BoxQuantityDecimals = 0;
			// Reference data.
			currencyCodes = SaReferenceDataConsole.GetReferenceDataCodes(ReferenceDataSystemCode.CurrencyCode);
		}
		protected override void Dispose(bool disposing)
		{
			if (disposing)
			{
				if (internals != null) internals.Dispose();
			}
			base.Dispose(disposing);
		}

		//-------------------------------------------------------------------
		// Async initialisation.
		public async void InitialiseCodeTypesAsync()
		{
			if (codeTypeCache != null) return;
			// Populate cache with codes for all supported code types.
			// Intended to minimise db I/O to retrieve all required codes.
			SaCode.Params prmCode = new SaCode.Params();
			foreach (Sbm.ApplCodeType codeType in SupportedCodeTypes)
				prmCode.CodeTypeCodes.Add(SbmSystem.GetCodeTypeCode(codeType));
			prmCode.StatusCat = SaCode.StatusCat.Any;
			codeTypeCache = new CodeTypeCache(await CodeTypeConsole.GetCodesByCodeTypeAsync(prmCode));
		}

		//-------------------------------------------------------------------
		// Properties.
		protected bool DebugMode { get; } = SacsSystem.DebugMode;
		protected ElapsedTimeLogger ElapsedLogger { get; }
		// Numeric control values.
		protected int WeightDecimals { get; set; } = 0;
		protected int LengthDecimals { get; set; } = 0;
		protected int VolumeDecimals { get; set; } = 0;
		protected int DensityDecimals { get; set; } = 0;
		protected int BoxQuantityDecimals { get; set; } = 0;
		protected int OrderQuantityDecimals { get; set; } = 0;
		// System codes.
		protected List<TypeCodeDesc> ItemTypes { get { return GetCodesOfType(Sbm.SystemCode.ItemType); } }
		protected List<TypeCodeDesc> InterfaceOptionCodes { get { return GetCodesOfType(Sbm.SystemCode.InterfaceOption); } }
		// Status.
		protected String StatusActive { get; } = SacsSystem.GetStatusCode(SaStatus.Active);
		protected String StatusProvisional { get; } = SacsSystem.GetStatusCode(SaStatus.Provisional);
		protected String StatusAwaiting { get; } = SacsSystem.GetStatusCode(SaStatus.Awaiting);
		protected String StatusCurrent { get; } = SacsSystem.GetStatusCode(SaStatus.Current);
		protected String StatusCompleted { get; } = SacsSystem.GetStatusCode(SaStatus.Completed);
		protected String StatusCancelled { get; } = SacsSystem.GetStatusCode(SaStatus.Cancelled);
		protected String StatusDisabled { get; } = SacsSystem.GetStatusCode(SaStatus.Disabled);
		protected String StatusDeleted { get; } = SacsSystem.GetStatusCode(SaStatus.Deleted);
		// Session.
		protected ISbmUserContext UserContext { get; }
		protected SbmSessionContext SessionContext { get { return UserContext.SessionContext; } }
		protected SbmInternals Internals
		{
			get
			{
				if (internals == null) internals = new SbmInternals(UserContext);
				return internals;
			}
		}
		public SysId AffiliateId_Owner { get { return UserContext.Organisation.AffiliateId; } }
		protected SbmAccountsDfn AccountsDfn { get { return Internals.AccountsDfn; } }
		protected DbUpdateInfo DbUpdateInfo { get { return Internals.DbUpdateInfo; } }
		// Managers.
		protected SbmAccountMgr AccountMgr { get { return Internals.AccountMgr; } }
		protected SbmCommodityMgr CommodityMgr { get { return Internals.CommodityMgr; } }
		protected SbmPriceMgr PriceMgr { get { return Internals.PriceMgr; } }
		protected SbmTransactionMgr TransactionMgr { get { return Internals.TransactionMgr; } }
		protected SbmStockMgr StockMgr { get { return Internals.StockMgr; } }
		protected SbmProcessMgr ProcessMgr { get { return Internals.ProcessMgr; } }
		protected SbmDataItemMgr DataItemMgr { get { return Internals.DataItemMgr; } }
		// Consoles.
		protected SbmConfigConsole ConfigConsole { get { return Internals.ConfigConsole; } }
		protected SaSecurityConsole SecurityConsole { get { return Internals.SecurityConsole; } }
		protected SaCodeTypeConsole CodeTypeConsole { get { return Internals.CodeTypeConsole; } }
		protected SaReferenceDataConsole ReferenceDataConsole { get { return Internals.ReferenceDataConsole; } }
		protected SaUpdateLogConsole UpdateLogConsole { get { return Internals.UpdateLogConsole; } }
		protected SaItemOptionConsole ItemOptionConsole { get { return Internals.ItemOptionConsole; } }
		protected SaInterfaceConsole InterfaceConsole { get { return Internals.InterfaceConsole; } }
		protected SaItemDocConsole ItemDocConsole { get { return Internals.ItemDocConsole; } }
		// Configurations.
		protected SbmStockControlConfig StockControlConfig { get { return Internals.StockControlConfig; } }
		protected SbmRequirementCostingConfig RequirementCostingConfig { get { return Internals.RequirementCostingConfig; } }
		// Currencies.
		protected List<TypeCodeDesc> CurrencyCodes { get { return new List<TypeCodeDesc>(currencyCodes); } }
		protected List<SaCurrency> GetCurrencies()
		{
			return Internals.GetCurrencies();
		}
		protected SaCurrency GetCurrencyById(SysId currencyId)
		{
			return Internals.GetCurrencyById(currencyId);
		}
		protected SaCurrency GetCurrencyByCode(String currencyCode)
		{
			return Internals.GetCurrencyByCode(currencyCode);
		}
		protected static byte CurrencyDecimalsDefault { get { return SbmInternals.CurrencyDecimalsDefault; } }
		protected byte GetCurrencyDecimalsForCurrencyById(SysId currencyId)
		{
			return Internals.GetCurrencyDecimalsForCurrencyById(currencyId);
		}

		//-------------------------------------------------------------------
		// Utilities.
		public List<TypeCodeDesc> GetCodesOfType(Sbm.SystemCode systemCode)
		{
			return systemCodeCache.GetCodesOfType(systemCode);
		}
		// Database utilities.
		public bool TableExists(SbmDbDfn.TableIdx tableIdx)
		{
			SbmApplication application = SbmGlobals.Application;
			if (application != null)
			{
				ISacsDatabase busMgrDb = application.GetBusMgrDatabase(SessionContext);
				return application.DbTableExists(busMgrDb, tableIdx);
			}
			return false;
		}
		public bool ColumnExists(SbmDbDfn.ColumnIdx columnIdx)
		{
			SbmApplication application = SbmGlobals.Application;
			if (application != null)
			{
				ISacsDatabase busMgrDb = application.GetBusMgrDatabase(SessionContext);
				return application.DbColumnExists(busMgrDb, columnIdx);
			}
			return false;
		}

		//-------------------------------------------------------------------
		// Configuration console utilities.
		public bool AllowConfigOption(Sbm.ConfigOption configOption)
		{
			return ConfigConsole.AllowOption(UserContext, configOption);
		}
		public bool AllowAffiliateType(Sbm.AffiliateType affiliateType)
		{
			return ConfigConsole.AllowAffiliateType(UserContext, affiliateType);
		}
		public bool AllowAssociationType(Sbm.AssociationType associationType)
		{
			return ConfigConsole.AllowAssociationType(UserContext, associationType);
		}
		public bool AllowTransactionType(Sbm.TransactionType transactionType)
		{
			return ConfigConsole.AllowTransactionType(UserContext, transactionType);
		}
		public String GetAttributeCaption(SbmDbDfn.ColumnIdx columnIdx, String defaultValue)
		{
			return ConfigConsole.GetAttributeCaption(UserContext, columnIdx, defaultValue);
		}

		//-------------------------------------------------------------------
		//                        C o d e   T y p e s
		//-------------------------------------------------------------------
		public virtual List<Sbm.ApplCodeType> SupportedCodeTypes { get; } = new List<Sbm.ApplCodeType>();
		private CodeTypeCache codeTypeCache;
		public bool CodeTypeHasCodes(Sbm.ApplCodeType codeType)
		{
			if (DebugMode && !SupportedCodeTypes.Contains(codeType)) throw new NotSupportedException(GetType().Name + ".CodeTypeHasCodes Unsupported code type: " + codeType);
			PopulateCodeTypes();
			return codeTypeCache.CodeTypeHasCodes(codeType);
		}
		public String GetCodeTypeCodeDesc(Sbm.ApplCodeType codeType, String code, bool defaultToCode = true)
		{
			if (DebugMode && !SupportedCodeTypes.Contains(codeType)) throw new NotSupportedException(GetType().Name + ".GetCodeTypeCodeDesc Unsupported code type: " + codeType);
			PopulateCodeTypes();
			List<SaCode> codes = codeTypeCache.GetCodesForCodeType(codeType, false);
			if (codes != null)
				return codes.GetDescForCode(code, defaultToCode ? code : "");
			return "";
		}
		public List<SaCode> GetCodesForCodeType(Sbm.ApplCodeType codeType, bool activeOnly = true)
		{
			if (DebugMode && !SupportedCodeTypes.Contains(codeType)) throw new NotSupportedException(GetType().Name + ".GetCodesForCodeType Unsupported code type: " + codeType);
			PopulateCodeTypes();
			return codeTypeCache.GetCodesForCodeType(codeType, activeOnly);
		}
		public List<CodeDesc> GetCodeDescsForCodeType(Sbm.ApplCodeType codeType, bool activeOnly = true)
		{
			if (DebugMode && !SupportedCodeTypes.Contains(codeType)) throw new NotSupportedException(GetType().Name + ".GetCodeDescsForCodeType Unsupported code type: " + codeType);
			PopulateCodeTypes();
			return codeTypeCache.GetCodeDescsForCodeType(codeType, activeOnly);
		}
		private void PopulateCodeTypes()
		{
			if (codeTypeCache != null) return;
			// Populate cache with codes for all supported code types.
			// Intended to minimise db I/O to retrieve all required codes.
			SaCode.Params prmCode = new SaCode.Params();
			foreach (Sbm.ApplCodeType codeType in SupportedCodeTypes)
				prmCode.CodeTypeCodes.Add(SbmSystem.GetCodeTypeCode(codeType));
			prmCode.StatusCat = SaCode.StatusCat.Any;
			Dictionary<String, List<SaCode>> codesByCodeType = CodeTypeConsole.GetCodesByCodeType(prmCode);
			// Populate any supported code types without codes.
			foreach (Sbm.ApplCodeType codeType in SupportedCodeTypes)
			{
				String codeTypeCode = SbmSystem.GetCodeTypeCode(codeType);
				if (!codesByCodeType.ContainsKey(codeTypeCode))
					codesByCodeType[codeTypeCode] = new List<SaCode>();
			}
			codeTypeCache = new CodeTypeCache(codesByCodeType);
		}

		//-------------------------------------------------------------------
		//                    R e f e r e n c e   D a t a
		//-------------------------------------------------------------------
		// Currencies.
		private void PopulateCurrencies()
		{
			if (currencies != null) return;
			SaCurrency.Params prmCurrency = new SaCurrency.Params();
			prmCurrency.StatusCat = SaCurrency.StatusCat.Any;
			currencies = ReferenceDataConsole.GetCurrencyList(prmCurrency);
		}
		public SaCurrency GetDefaultCurrency()
		{
			PopulateCurrencies();
			String currencyCode = CurrencyCodes.GetCodeForType(SaCurrencyCode.Sterling);
			return currencies.Find(item => item.Code.EqualsCI(currencyCode));
		}
		public SaCurrency GetCurrency(SysId currencyId)
		{
			PopulateCurrencies();
			return currencies.Find(item => item.Id.Equals(currencyId));
		}
		//-------------------------------------------------------------------
		// Regions.
		private void PopulateRegions()
		{
			if (regions != null) return;
			SaRegion.Params prmRegion = new SaRegion.Params();
			regions = ReferenceDataConsole.GetRegionList(prmRegion);
		}
		public SaRegion FindRegionById(SysId regionId)
		{
			PopulateRegions();
			return regions.FindById(regionId);
		}
		//-------------------------------------------------------------------
		// Tax codes.
		private void PopulateTaxCodes()
		{
			if (taxCodes != null) return;
			SaTaxCode.Params prmTaxCode = new SaTaxCode.Params();
			taxCodes = ReferenceDataConsole.GetTaxCodeList(prmTaxCode);
		}
		public SaTaxCode FindTaxCodeById(SysId taxCodeId)
		{
			PopulateTaxCodes();
			return taxCodes.Find(item => item.Id.Equals(taxCodeId));
		}
		public SaTaxCode FindTaxCodeEffectiveOn(String taxCode, DateTime effectiveOn)
		{
			PopulateTaxCodes();
			return taxCodes.FindByCodeEffectiveOn(taxCode, effectiveOn);
		}
		//-------------------------------------------------------------------
		// Units of measure.
		private void PopulateUnitsOfMeasure()
		{
			if (taxCodes != null) return;
			SaUnitMeasure.Params prmUnitOfMeasure = new SaUnitMeasure.Params();
			prmUnitOfMeasure.StatusCat = SaUnitMeasure.StatusCat.Any;
			unitsOfMeasure = ReferenceDataConsole.GetUnitMeasureList(prmUnitOfMeasure);
		}
		public SaUnitMeasure FindUnitOfMeasureById(SysId uomId)
		{
			PopulateUnitsOfMeasure();
			return unitsOfMeasure.FindById(uomId);
		}
		public List<SaUnitMeasure> FindUnitsOfMeasureByCategory(SaUomCategory uomCategory)
		{
			PopulateUnitsOfMeasure();
			return unitsOfMeasure.FindAll(item => item.Category == uomCategory);
		}

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