using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Sarand.BusinessMgr.Net.Core.Web.App;
using Sarand.BusinessMgr.Net.Core.Web.Helpers;
using Sarand.BusinessMgr.Net.Standard.Base.App;
using Sarand.BusinessMgr.Net.Standard.Base.Consoles;
using Sarand.BusinessMgr.Net.Standard.Dbas.Utils;
using Sarand.Net.Standard.Base.App;
using Sarand.Net.Standard.Base.Core;
using Sarand.Net.Standard.Base.Dbas;
using Sarand.Net.Standard.Base.IO;
using Sarand.Net.Standard.Base.Utils;
using Sarand.Net.Standard.Dbas.Base;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Sarand.BusinessMgr.Net.Core.Web.Control.App
{
	//=======================================================================
	public class SbmApplication_Control : SbmApplication_Web
	{
		//-------------------------------------------------------------------
		// Data members.
		private bool generateDatabaseDefinitions_Control = true;
		private bool generateDatabaseDefinitions_BusMgr = true;
		private PropertySet propertySet;
		private Dictionary<String, SbmAppConfig> appConfigs = new Dictionary<string, SbmAppConfig>();
		private Dictionary<String, SbmEmailConfig> emailConfigs = new Dictionary<string, SbmEmailConfig>();
		ushort sessionContextIdx_Control = 0;
		// Singular databases.
		private ISacsDatabase controlDatabase = null;
		private ISacsDatabase templateDatabase = null;
		// Session contexts.
		private static ushort sessionContextIdx_Next = 100;
		private class SessionContextData
		{
			public SessionContextData(SbmSessionContext_Web sessionContext)
			{
				SessionContext = sessionContext;
			}
			public SbmSessionContext_Web SessionContext { get; }
            public List<string> DbIdentifiers { get; } = new List<string>();
            public ISacsDatabase BusMgrDatabase { get; set; }
		}
		private readonly Dictionary<ushort, SessionContextData> sessionContexts = new Dictionary<ushort, SessionContextData>();

		//-------------------------------------------------------------------
		// Construction.
		public SbmApplication_Control(IConfiguration configuration)
		{
			InitialiseTemporaryLoggingFolder();
			try
			{
				propertySet = new PropertySet();
				SbmGlobals.System = (System_Web = new SbmSystem_Web(propertySet));
				Configuration = configuration;
			}
			catch (Exception exc)
			{
				SaLogger.Error($"{GetType().Name}.CTR {ExceptionUtil.GetErrorStateMessage(exc)}");
				throw;
			}
		}

		//-------------------------------------------------------------------
		// Properties.
		// Application Configuration.
		public override SbmAppConfig AppConfig { get { return appConfigs.Values.ToList().getConfigForApplication(); } }
		// Session Configuration.
		public override String SessionCookieName { get { return Sbm.Config.Control.Session.Cookie.Name; } }
		public override List<ushort> GetSessionContextIdxs()
		{
			return sessionContexts.Values.Select(item => item.SessionContext.Index).ToList();
		}
		public override SbmSessionContext GetSessionContext(ushort index)
		{
			return sessionContexts.GetValue(index, null)?.SessionContext ?? null;
		}
		public override ISacsDatabase GetControlDatabase()
		{
			return controlDatabase;
		}
		public override ISacsDatabase GetTemplateDatabase()
		{
			return templateDatabase;
		}
        public override List<string> GetDbIdentifiers(SbmSessionContext sessionContext)
        {
            return sessionContexts.GetValue(sessionContext.Index, null)?.DbIdentifiers ?? new List<string>();
        }
        public override ISacsDatabase GetBusMgrDatabase(SbmSessionContext sessionContext)
		{
			return sessionContexts.GetValue(sessionContext.Index, null)?.BusMgrDatabase;
		}
		public override SbmEmailConfig EmailConfig { get { return emailConfigs.Values.ToList().getConfigForSession(AppConfig); } }

		//-------------------------------------------------------------------
		// Initialisation.
		/// <summary>Initialise environment - from Startup.</summary>
		internal void InitWebHostEnvironment(IWebHostEnvironment env)
		{
			InitEnvironment(env);
		}
		/// <summary>Initialise environment - from internal (above) or unit tests.</summary>
		protected void InitEnvironment(IWebHostEnvironment env)
		{
			Development = env.IsDevelopment();
			environmentName = env.EnvironmentName;
			SaLogger.LogFilenamePrefix = "Sbm-Web-Adm";
			SaLogger.IncludeHostInFileMessage = false;
			SaLogger.IncludeUserInFileMessage = false;

			try
			{
				// Load server configuration.
				var builder = new ConfigurationBuilder()
				.SetBasePath(env.ContentRootPath)
				.AddJsonFile("appsettings.json", optional: true, reloadOnChange: false)
				.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: false)
				.AddJsonFile($"appsettings.machine.{SbmSystem.ComputerName}.json", optional: false, reloadOnChange: false)
				.AddEnvironmentVariables();
				SbmConfiguration = builder.Build();

				// Application configuration.
				appConfigs = SbmAppConfigHelper.ExtractAppConfigs(SbmConfiguration.GetSection("AppConfigs"));
				emailConfigs = SbmEmailConfigHelper.ExtractEmailConfigs(SbmConfiguration.GetSection("EmailConfigs"));
				LoggingRootFolder = AppConfig.Logging.RootFolder;

				// Application instance.
				if (AppConfig.Instance.EqualsCI("Dev")) instanceType = Sbm.InstanceType.Dev;
				else if (AppConfig.Instance.ContainsCI("Q")) instanceType = Sbm.InstanceType.QC;
				else if (AppConfig.Instance.ContainsCI("UAT")) instanceType = Sbm.InstanceType.UAT;
				else if (AppConfig.Instance.EqualsCI("PreProd")) instanceType = Sbm.InstanceType.UAT;

				// Initialise hard-coded logging path.
				if (StringUtil.IsEmpty(LoggingRootFolder))
				{
					if (SbmSystem.ComputerName.EqualsCI("WIN-BPCLM1QUOMT"))
						LoggingRootFolder = @"D:\Sbmonite\Logs\" + (Development ? "Dev" : "Test");
				}
				if (DirectoryUtil.DirectoryExists(LoggingRootFolder))
					SaLogger.LogFolder = LoggingRootFolder;
				LogApplicationStart($"{SysUtil.Fn}");

				// Control database connection.
				SacsDatabaseConsole.OdbcConfig odbcConfig = new SacsDatabaseConsole.OdbcConfig();
				odbcConfig.location = AppConfig.ControlDatabase.Location;
				odbcConfig.user = AppConfig.ControlDatabase.User;
				odbcConfig.pword = AppConfig.ControlDatabase.Password;
				controlDatabase = SacsDatabaseConsole.OpenOdbcDatabase(odbcConfig);
				if (controlDatabase.HasErrorState())
					SaLogger.Warn($"{SysUtil.Fn} Control Database initialisation error: " + controlDatabase.ErrorStateMessage);

				// Template database connection.
				if (AppConfig.TemplateDatabase != null)
				{
					odbcConfig = new SacsDatabaseConsole.OdbcConfig();
					odbcConfig.location = AppConfig.TemplateDatabase.Location;
					odbcConfig.user = AppConfig.TemplateDatabase.User;
					odbcConfig.pword = AppConfig.TemplateDatabase.Password;
					templateDatabase = SacsDatabaseConsole.OpenOdbcDatabase(odbcConfig);
					if (templateDatabase.HasErrorState())
						SaLogger.Warn($"{SysUtil.Fn} Template Database initialisation error: " + controlDatabase.ErrorStateMessage);
				}

				// BusinessMgr database connections.
				foreach (SbmAppConfig.DatabaseConfig dbConfig in AppConfig.BusMgrDatabases)
				{
					odbcConfig = new SacsDatabaseConsole.OdbcConfig();
					odbcConfig.location = dbConfig.Location;
					odbcConfig.user = dbConfig.User;
					odbcConfig.pword = dbConfig.Password;
					SacsDatabase busMgrDatabase = SacsDatabaseConsole.OpenOdbcDatabase(odbcConfig);
					if (busMgrDatabase.HasErrorState())
						SaLogger.Warn($"{SysUtil.Fn} BusMgr Database: " + busMgrDatabase.DatabaseName + ". Initialisation error: " + busMgrDatabase.ErrorStateMessage);

					// Session context.
					ushort sessionContextIdx = sessionContextIdx_Next++;
					if (sessionContextIdx_Control < 1)
						sessionContextIdx_Control = sessionContextIdx;
					SessionContextData sessionContextData = new SessionContextData(new SbmSessionContext_Web(sessionContextIdx, Sbm.Application.WebControl));
                    sessionContextData.DbIdentifiers.AddRange(dbConfig.Identifiers);
                    sessionContextData.BusMgrDatabase = busMgrDatabase;
					sessionContexts.Add(sessionContextData.SessionContext.Index, sessionContextData);
				}
			}
			catch (Exception exc)
			{
				SaLogger.Error($"{SysUtil.Fn} " + ExceptionUtil.GetLogMessage(exc));
			}

			// Occasional startup processing.
			if (generateDatabaseDefinitions_Control)
				GenerateDatabaseDefinition(SbmDbDfnGenerator.DatabaseInstance.Control, GetControlDatabase());
			if (generateDatabaseDefinitions_BusMgr)
			{
				// Use the 'template' database connection parameters.
				SacsDatabaseConsole.OdbcConfig config = new SacsDatabaseConsole.OdbcConfig();
				config.location = AppConfig.TemplateDatabase.Location;
				config.user = AppConfig.TemplateDatabase.User;
				config.pword = AppConfig.TemplateDatabase.Password;
				GenerateDatabaseDefinition(SbmDbDfnGenerator.DatabaseInstance.BusinessMgr, GetTemplateDatabase());
			}
		}

		//-------------------------------------------------------------------
		// Generate database definition.
		private void GenerateDatabaseDefinition(SbmDbDfnGenerator.DatabaseInstance dbInstance, ISacsDatabase db)
		{
			if (!generateDatabaseDefinitions_BusMgr || !SbmSystem.DebugMode) return;
			if (!StringUtil.EmptyOnNull(EnvironmentName).EqualsCI("Development")) return;
			if (db == null || StringUtil.IsEmpty(db.ConnectionString)) return;

			// Generate database definitions.
			GenerateDatabaseDefinition(dbInstance, db.ConnectionString);
		}
		private void GenerateDatabaseDefinition(SbmDbDfnGenerator.DatabaseInstance dbInstance, String connectionString)
		{
			if (!generateDatabaseDefinitions_BusMgr || !SbmSystem.DebugMode) return;
			if (!StringUtil.EmptyOnNull(EnvironmentName).EqualsCI("Development")) return;
			if (StringUtil.IsEmpty(connectionString)) return;

			// Generate database definitions.
			SbmDbDfnGenerator.Generate(dbInstance, connectionString);
			//SaUpdateLogDbDfnGenerator.Generate(database.ConnectionString);
		}

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