using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Localization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Routing;
using Microsoft.Net.Http.Headers;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using Sacs.Web.Components;
using Sarand.Net.Standard.Base.App;
using Sarand.Net.Standard.Base.Bus;
using Sarand.Net.Standard.Base.Core;
using Sarand.Net.Standard.Base.Dbas;
using Sarand.Net.Standard.Base.Email;
using Sarand.Net.Standard.Base.Helpers;
using Sarand.Net.Standard.Base.Utils;
using Saxonite.Net.Core.Web.Base.App;
using Saxonite.Net.Core.Web.Base.Consoles;
using Saxonite.Net.Core.Web.Base.Models;
using Saxonite.Net.Standard.Base.App;
using Saxonite.Net.Standard.Base.Bus;
using Saxonite.Net.Standard.Base.Consoles;
using Saxonite.Net.Standard.Base.Mgr;
using Saxonite.Net.Standard.Base.Mgr.Reference;
using Saxonite.Net.Standard.Base.Mgr.Support;
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;

namespace Saxonite.Net.Core.Web.Base.Controllers
{
	//=======================================================================
	public abstract class SaxController_Base : SaController
	{
		//-------------------------------------------------------------------
		// Data members.
		private SaxInternals internals;

		//-------------------------------------------------------------------
		// Protected construction.
		protected SaxController_Base(SaxLocaliser localiser)
		{
			Localiser = localiser;

			// Initialise console (debug) logging listener.
			//if (Directory.Exists(App.LoggingRootFolder) && SaxSystem.DebugMode)
			//	SaxConsoleListener.ConfigureDebugListener(App.LoggingRootFolder);
			if (DebugMode) SaLogger.Trace(GetType().Name + ".CTR");
		}
		protected override void Dispose(bool disposing)
		{
			if (disposing)
			{
			}
			base.Dispose(disposing);
		}

		//-------------------------------------------------------------------
		// Properties.
		protected SaxApplication_Web App { get { return SaxApplication_Web.WebApp; } }
		public SaxAppConfig AppConfig { get { return App.AppConfig; } }
		public SaxSessionContext SessionContext { get { return App.SessionContext; } }
		public SaxLocaliser Localiser { get; }

		//-------------------------------------------------------------------
		// Globals.
		protected SaxConsoleHelper ConsoleHelper { get { return SaxGlobals.ConsoleHelper; } }

		//-------------------------------------------------------------------
		// Business components.
		public SaxInternals Internals { get { if (internals == null) internals = new SaxInternals(SessionContext); return internals; } }
		// Consoles.
		public SaxDataCacheConsole DataCacheConsole { get { return Internals.DataCacheConsole; } }
		public SaxSessionDataConsole SessionDataConsole { get { return Internals.SessionDataConsole; } }
		public SaxActivityConsole ActivityConsole { get { return Internals.ActivityConsole; } }
		// Managers.
		public SaxReferenceMgr ReferenceMgr { get { return Internals.ReferenceMgr; } }
		public SaxAccountMgr AccountMgr { get { return Internals.AccountMgr; } }
		public SaxActivityMgr ActivityMgr { get { return Internals.ActivityMgr; } }
		public SaxItemDataMgr ItemDataMgr { get { return Internals.ItemDataMgr; } }
		public SaxReferenceGolfMgr ReferenceGolfMgr { get { return Internals.ReferenceGolfMgr; } }
		public SaxSupportMgr SupportMgr { get { return Internals.SupportMgr; } }
		// System codes.
		public List<TypeCodeDesc> DataItemTypeCodes { get { return Internals.DataItemTypeCodes; } }
		public List<TypeCodeDesc> SportSpecialityLabelCodes { get { return Internals.SportSpecialityLabelCodes; } }
		public List<TypeCodeDesc> SportContactTypeCodes { get { return Internals.SportContactTypeCodes; } }
		public List<TypeCodeDesc> SportParticipatingCodes { get { return Internals.SportParticipatingCodes; } }
		public List<TypeCodeDesc> SportPreparingCodes { get { return Internals.SportPreparingCodes; } }
		public List<TypeCodeDesc> SportOfficiatingCodes { get { return Internals.SportOfficiatingCodes; } }
		public List<TypeCodeDesc> RegionTypeCodes { get { return Internals.RegionTypeCodes; } }
		public List<TypeCodeDesc> EligibilityTypeCodes { get { return Internals.EligibilityTypeCodes; } }
		public List<TypeCodeDesc> UserRoleCodes { get { return Internals.UserRoleCodes; } }
		public List<TypeCodeDesc> OrganisationTypeCodes { get { return Internals.OrganisationTypeCodes; } }
		public List<TypeCodeDesc> OrganisationCategoryCodes { get { return Internals.OrganisationCategoryCodes; } }
		public List<TypeCodeDesc> OrganisationRoleCodes { get { return Internals.OrganisationRoleCodes; } }
		public List<TypeCodeDesc> AssociationTypeCodes { get { return Internals.AssociationTypeCodes; } }
		public List<TypeCodeDesc> AddressTypeCodes { get { return Internals.AddressTypeCodes; } }
		public List<TypeCodeDesc> ContactMethodCodes { get { return Internals.ContactMethodCodes; } }
		public List<TypeCodeDesc> EventTypeCodes { get { return Internals.EventTypeCodes; } }
		public List<TypeCodeDesc> OpportunityTypeCodes { get { return Internals.OpportunityTypeCodes; } }
		public List<TypeCodeDesc> ActivityReactionCodes { get { return Internals.ActivityReactionCodes; } }
		// Support.
		public List<TypeCodeDesc> UserReportTypeCodes { get { return Internals.UserReportTypeCodes; } }
		// Email.
		public SaEmailConfig EmailConfig { get { return App.EmailConfig; } }
		public SaxEmailConsole EmailConsole { get { return Internals.EmailConsole; } }

		//-------------------------------------------------------------------
		// Action execution events.
		//-------------------------------------------------------------------
		public override void OnActionExecuting(ActionExecutingContext filterContext)
		{
			//if (DebugMode) SaLogger.Debug(GetType().Name + ".OnActionExecuting" + (ViewData.Model != null ? " Model: " + ViewData.Model : ""));

			// Refreh model properties.
			SaxModel_Base baseModel = ViewData.Model as SaxModel_Base;
			RefreshModel(baseModel);

			base.OnActionExecuting(filterContext);
		}
		public override void OnActionExecuted(ActionExecutedContext filterContext)
		{
			//if (DebugMode) SaLogger.Debug(GetType().Name + ".OnActionExecuted" + (ViewData.Model != null ? " Model: " + ViewData.Model : ""));

			// Refreh model properties.
			SaxModel_Base baseModel = ViewData.Model as SaxModel_Base;
			RefreshModel(baseModel);

			// Store session data if present - as potentially modfied.
			if (SessionData != null)
			{
				// Most actions will store the session data in case it's been modified.
				// Some actions (eg. score password) don't need to.
				if (StoreSessionData)
				{
					String sessionDataJson = JsonConvert.SerializeObject(SessionData);
					HttpContext.Session.Set(SessionStorage.SessionKey_SessionData, SessionStorage.sessionDataEncoding.GetBytes(sessionDataJson));
				}
			}
			else HttpContext.Session.Remove(SessionStorage.SessionKey_SessionData);

			// Response headers.
			if (baseModel != null && baseModel.ProhibitCache)
			{
				if (Response.Headers.ContainsKey(HeaderNames.CacheControl))
					Response.Headers.Remove(HeaderNames.CacheControl);
				Response.Headers.Add(HeaderNames.CacheControl, "no-cache, no-store, must-revalidate");
				Response.Headers.Add(HeaderNames.Pragma, "no-cache");
				Response.Headers.Add(HeaderNames.Expires, "0");
			}

			base.OnActionExecuted(filterContext);
		}

		//-------------------------------------------------------------------
		// Model.
		//-------------------------------------------------------------------
		protected void RefreshModel(SaxModel_Base model)
		{
			if (model == null) return;

			// Session data.
			model.Controller = this;
			model.SessionData = SessionData;

			// Redirect locations.
			model.RedirectLocation.Base = GetRedirectLocation(RedirectLocation.WebAppBase);
			model.RedirectLocation.Home = GetRedirectLocation(RedirectLocation.WebAppHome);
			model.RedirectLocation.Home_SessionExpired = GetRedirectLocation(RedirectLocation.WebAppHome_SessionExpired);
		}

		//-------------------------------------------------------------------
		// Parameters.
		//-------------------------------------------------------------------
		// Online Request Password encryption parameters (key & IV) are defined in
		// the base Controller so that they can be shared with the Adnin application.
		// NB IV value is generated from the key and fixed so that it doesn't change when the application restarts.
		// IV Must be regenerated if key is changed.
		protected static String Base64Key_RequestPassword_Online { get; } = SacsEncryptionHelper.EncodePlainKey("{~Saxonite@@Request^Password=}", SacsEncryptionHelper.KeyLength);
		//private static String Base64IV_RequestPassword_Generated_Online { get; } = SacsEncryptionHelper.InitSymmetricEncryptionIV(Base64Key_RequestPassword_Online);
		protected static String Base64IV_RequestPassword_Online { get; } = "1VAWYTW6d72n/6HDNhbqow==";

		//-------------------------------------------------------------------
		// Session.
		//-------------------------------------------------------------------
		private bool UserActiveRecorded { get; set; } = false;
		public bool ValidUserSession
		{
			get
			{
				if (SessionData == null || !SessionData.ValidUserSession) return false;
				SaxSessionDataConsole sessionDataConsole = SessionDataConsole;
				if (sessionDataConsole != null && !UserActiveRecorded)
				{
					// Record the user as active once per request.
					sessionDataConsole.RecordUserActive(SessionUserAccountId, CreatedAt);
					UserActiveRecorded = true;
				}
				return true;
			}
		}
		public SysId SessionUserAccountId { get { return SessionData?.User?.UserAccountId ?? null; } }
		public DbUpdateInfo DbUpdateInfo { get { return SessionData?.DbUpdateInfo ?? new DbUpdateInfo(null, "", SaxSystem.ComputerName); } }
		// Referrer.
		public String Referer { get { return Request.Headers["Referer"].ToString(); } }
		public bool ValidReferer { get { return !StringUtil.IsEmpty(Referer); } }

		/// <summary>Store session data, eg. to start a new user session on sign-in.</summary>
		protected bool SetSessionData(SaxSessionData sessionData)
		{
			if (sessionStorage.SessionData != null) return false;
			sessionStorage.SessionData = sessionData;
			return true;
		}
		protected void ClearSessionData()
		{
			if (HttpContext.Session.IsAvailable)
				HttpContext.Session.Clear();
			sessionStorage.SessionData = null;
		}

		//-------------------------------------------------------------------
		// Session storage.
		public class SessionStorage
		{
			public SaxSessionData SessionData { get; set; }
			public static String SessionKey_SessionData { get; } = "SaxSessionData";
			public static Encoding sessionDataEncoding { get; } = Encoding.UTF8;
			//JSON Serialisation.
			public class SaxSessionDataContractResolver : DefaultContractResolver
			{
				// To allow private properties to be deserialised.
				// NB Only applies to top level properties in the serialised object.
				protected override List<MemberInfo> GetSerializableMembers(Type objectType)
				{
					var flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
					MemberInfo[] fields = objectType.GetFields(flags);
					return fields
						.Concat(objectType.GetProperties(flags).Where(propInfo => propInfo.CanWrite))
						.ToList();
				}
				protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
				{
					return base.CreateProperties(type, MemberSerialization.Fields);
				}
			};
			public static JsonSerializerSettings JsonDeserialisationSettings = new JsonSerializerSettings
			{
				ContractResolver = new SaxSessionDataContractResolver(),
				// Force all deserialised objects to be replaced - to avoid proxy lists not populating.
				ObjectCreationHandling = ObjectCreationHandling.Replace
			};
		}
		private readonly SessionStorage sessionStorage = new SessionStorage();
		protected JsonSerializerSettings SaxSessionDataJsonSerializerSettings { get { return SessionStorage.JsonDeserialisationSettings; } }

		//-------------------------------------------------------------------
		public SaxSessionData SessionData
		{
			get
			{
				try
				{
					// Retrieve session data if not already in controller.
					if (sessionStorage.SessionData == null)
					{
						byte[] sessionDataBytes = null;
						HttpContext.Session.TryGetValue(SessionStorage.SessionKey_SessionData, out sessionDataBytes);
						if (sessionDataBytes != null)
						{
							String sessionDataJson = SessionStorage.sessionDataEncoding.GetString(sessionDataBytes);
							sessionStorage.SessionData = DeserializeSessionData(sessionDataJson);
						}
					}
					return sessionStorage.SessionData;
				}
				catch (Exception exc)
				{
					SaLogger.Warn(GetType().Name + ".SessionData " + exc.GetType().Name + " - " + exc.Message + exc.GetStackEntries().Concat("", "\n\t"));
				}
				return null;
			}
		}
		protected abstract SaxSessionData DeserializeSessionData(String sessionDataJson);

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