using Microsoft.AspNetCore.Html;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Localization;
using Sarand.BusinessMgr.Net.Standard.Base.App;
using Sarand.BusinessMgr.Net.Standard.Base.Consoles;
using Sarand.Net.Standard.Base.App;
using Sarand.Net.Standard.Base.Core;
using Sarand.Net.Standard.Base.Net;
using Sarand.Net.Standard.Base.Utils;
using System;
using System.Collections.Generic;
using System.Text;

namespace Sarand.BusinessMgr.Net.Core.Web.App
{
	//=======================================================================
	public abstract class SbmLocaliser
	{
		//-------------------------------------------------------------------
		// Data members.

		//-------------------------------------------------------------------
		/// <summary>
		///  Localisers are supplied by derived object.
		/// </summary>
		protected SbmLocaliser()
		{
		}

		//-------------------------------------------------------------------
		// Properties.
		public abstract IStringLocalizer MainProperties { get; }
		public virtual List<IStringLocalizer> AlternativeProperties { get; } = new List<IStringLocalizer>();
		private HashSet<String> MissingKeysLogged { get; } = new HashSet<String>(StringComparer.OrdinalIgnoreCase);

		//-------------------------------------------------------------------
		// Generic phrase translation.
		//-------------------------------------------------------------------
		/// <summary>Retrieve localised text.</summary>
		public LocalizedString GetText(string key, bool logMissingKey = true)
		{
			return GetText(key, new object[] { }, logMissingKey);
		}
		public LocalizedString GetText(string key, object param)
		{
			return GetText(key, new object[] { param });
		}
		public LocalizedString GetText(string key, object param1, object param2)
		{
			return GetText(key, new object[] { param1, param2 });
		}
		public LocalizedString GetText(string key, object[] parameters, bool logMissingKey = true)
		{
			LocalizedString text = MainProperties.GetString(key, parameters);
			if (text.ResourceNotFound)
			{
				// Look up key in alternative property files.
				foreach (IStringLocalizer properties in AlternativeProperties ?? new List<IStringLocalizer>())
				{
					text = parameters == null || parameters.IsEmpty() ? properties.GetString(key) : properties.GetString(key, parameters);
					if (!text.ResourceNotFound)
						break;
				}
			}
			if (text.ResourceNotFound && logMissingKey && !MissingKeysLogged.Contains(key))
			{
				MissingKeysLogged.Add(key);
				SaLogger.Debug($"{SysUtil.Fn} Key not found: {key}");
			}
			return text;
		}

		// Square bracket indexing.
		public LocalizedString this[String key]
		{
			get { return GetText(key); }
		}
		public LocalizedString this[String key, object param]
		{
			get { return GetText(key, param); }
		}
		public LocalizedString this[String key, object param1, object param2]
		{
			get { return GetText(key, param1, param2); }
		}

		//-------------------------------------------------------------------
		/// <summary>
		/// Localised HTML text.
		/// <para>Line delimiters changed to '<br/>'.</para>
		/// </summary>
		public HtmlString GetHtmlText(string key, String param1 = "", String param2 = "")
		{
			return GetHtmlText(key, new Object[] { param1, param2 });
		}
		/// <summary>
		/// Localised HTML text.
		/// <para>Line delimiters changed to '<br/>'.</para>
		/// </summary>
		public HtmlString GetHtmlText(string key, object[] parameters)
		{
			LocalizedString localisedText = GetText(key, parameters);
			String value = localisedText.Value;
			// Replace all line delimiters.
			value = value.Replace("\r\n", "\n").Replace("\n", "<br/>").Replace("\r", "<br/>");
			return new HtmlString(value);
		}

		//-------------------------------------------------------------------
		/// <summary>
		/// Encode the text to avoid conflict with HTML document structure.
		/// </summary>
		public String HtmlEncode(string text)
		{
			return WebUtil.HtmlEncode(text);
		}

		//-------------------------------------------------------------------
		/// <summary>
		/// Localised javascript string.
		/// <para>All quotes are escaped.</para>
		/// </summary>
		public LocalizedString GetJavascriptText(string key, String param1 = "", String param2 = "")
		{
			LocalizedString localisedText = GetText(key, param1, param2);
			return new LocalizedString(localisedText, EscapeJavascriptText(localisedText.Value), localisedText.ResourceNotFound);
		}
		public String EscapeJavascriptText(string value)
		{
			// Escape all quotes.
			value = value.Replace("'", "\\'").Replace("\"", "\\\"");
			return value;
		}

		//-------------------------------------------------------------------
		// Numeric and datetime formatting
		//-------------------------------------------------------------------
		public static String DateFormat_Default { get; } = "d-MMM-yyyy";
		public static String DateWithWeekdayFormat_Default { get; } = "ddd d-MMM-yyyy";
		public String FormatDate(DateTime value, Boolean includeWeekday = true)
		{
			String dateFormat = includeWeekday ? DateWithWeekdayFormat_Default : DateFormat_Default;
			return DateUtil.Format(value, dateFormat);
		}

		//-------------------------------------------------------------------
		// System Codes.
		//-------------------------------------------------------------------
		private class CodeCache
		{
			public Dictionary<Sbm.ApplicationCode, List<TypeCodeDesc>> codes { get; } = new Dictionary<Sbm.ApplicationCode, List<TypeCodeDesc>>();
			public List<TypeCodeDesc> GetSystemCodes(Sbm.ApplicationCode codeType)
			{
				if (!codes.ContainsKey(codeType))
					codes.Add(codeType, SbmSystem.GetSystemCodes(codeType));
				return codes.GetValueOrDefault(codeType, new List<TypeCodeDesc>());
			}
		}
		private readonly CodeCache systemCodes = new CodeCache();

		// Status.
		public String GetStatusCaption(SaStatus status)
		{
			// ToDo Status description localisation.
			return SacsSystem.GetStatusDesc(status);
		}

		// Affiliate Type.
		public String GetAffiliateTypeCaption(Sbm.AffiliateType affiliateType)
		{
			if ((int)affiliateType < 1) return "";
			// ToDo Affiliate Type localisation.
			List<TypeCodeDesc> affiliateTypeCodes = systemCodes.GetSystemCodes(Sbm.ApplicationCode.AffiliateType);
			return affiliateTypeCodes.GetDescForType(affiliateType, affiliateTypeCodes.GetCodeForType(affiliateType));
		}

		// Association Type.
		public String GetAssociationTypeCaption(Sbm.AssociationType associationType)
		{
			if ((int)associationType < 1) return "";
			// ToDo Association Type localisation.
			List<TypeCodeDesc> associationTypeCodes = systemCodes.GetSystemCodes(Sbm.ApplicationCode.AssociationType);
			return associationTypeCodes.GetDescForType(associationType, associationTypeCodes.GetCodeForType(associationType));
		}

		// Asset Type.
		public String GetAssetTypeCaption(Sbm.AssetType assetType)
		{
			if ((int)assetType < 1) return "";
			// ToDo Asset Type localisation.
			List<TypeCodeDesc> assetTypeCodes = systemCodes.GetSystemCodes(Sbm.ApplicationCode.AssetType);
			return assetTypeCodes.GetDescForType(assetType, assetTypeCodes.GetCodeForType(assetType));
		}

		// Transaction Type.
		public String GetTransactionTypeCaption(Sbm.TransactionType transactionType)
		{
			if ((int)transactionType < 1) return "";
			// ToDo Transaction Type localisation.
			List<TypeCodeDesc> transactionTypeCodes = systemCodes.GetSystemCodes(Sbm.ApplicationCode.TransactionType);
			return transactionTypeCodes.GetDescForType(transactionType, transactionTypeCodes.GetCodeForType(transactionType));
		}

		// To be completed.

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