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

namespace Saxonite.Net.Core.Web.Online.App
{
	//=======================================================================
	public class SaxApplication_Online : SaxApplication_Web
	{
		//-------------------------------------------------------------------
		// Data members.
		private Dictionary<String, SaxAppConfig> appConfigs = new Dictionary<string, SaxAppConfig>();
		private Dictionary<String, SaxEmailConfig> emailConfigs = new Dictionary<string, SaxEmailConfig>();
		// Session contexts.
		protected class SessionContextData_Online : SessionContextData_Web
		{
			public SessionContextData_Online(SaxSessionContext_Web sessionContext) : base(sessionContext) { }
		}
		private readonly Dictionary<int, SessionContextData_Online> sessionContexts = new Dictionary<int, SessionContextData_Online>();

		//-------------------------------------------------------------------
		// Construction.
		public SaxApplication_Online(IConfiguration configuration)
		{
			InitialiseTemporaryLoggingFolder();
			try
			{
				AppInstance = this;
				Configuration = configuration;
				ConsoleHelper_Online = new SaxConsoleHelper_Online(this);
			}
			catch (Exception exc)
			{
				SaLogger.Error(GetType().Name + ".CTR " + ExceptionUtil.GetErrorStateMessage(exc));
				throw;
			}
		}
		protected override void Dispose(bool disposing)
		{
			if (disposing)
			{
				// Clear globals.
				AppInstance = null;
				// Console helper.
				if (ConsoleHelper_Online!= null)
					ConsoleHelper_Online.Dispose();
				ConsoleHelper_Online= null;
			}
			base.Dispose(disposing);
		}

		//-------------------------------------------------------------------
		// Globals.
		public static SaxApplication_Online AppInstance { get; private set; }
		public override SaxConsoleHelper ConsoleHelper { get { return ConsoleHelper_Online; } }
		public SaxConsoleHelper_Online ConsoleHelper_Online { get; private set; }
		// Database.
		public override ISacsDatabase GetDatabase(SaxSessionContext sessionContext, Sax.Database databaseType)
		{
			return sessionContexts.GetValue(sessionContext.Index, null)?.Databases.GetValue(databaseType, null) ?? null;
		}
		// Configuration.
		public override SaxAppConfig AppConfig { get { return appConfigs.Values.ToList().getConfigForApplication(); } }
		public override SaxEmailConfig EmailConfig { get { return emailConfigs.Values.ToList().getConfigForSession(AppConfig); } }
		public override String SessionCookieName { get { return Sax.Config.Online.Session.Cookie.Name; } }

		//-------------------------------------------------------------------
		// 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)
		{
			String fn = GetType().Name + ".InitEnvironment";
			Development = env.IsDevelopment();
			environmentName = env.EnvironmentName;
			SaLogger.LogFilenamePrefix = "Sax-Web-Onl";
			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.{SaxSystem.ComputerName}.json", optional: false, reloadOnChange: false)
				.AddEnvironmentVariables();
				SaxConfiguration = builder.Build();

				// Application configuration.
				appConfigs = SaxAppConfigHelper.ExtractAppConfigs(SaxConfiguration.GetSection("AppConfigs"));
				emailConfigs = SaxEmailConfigHelper.ExtractEmailConfigs(SaxConfiguration.GetSection("EmailConfigs"));
				LoggingRootFolder = AppConfig.Logging.RootFolder;

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

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

				// Session context - only one context available/necessary (for now).
				SessionContextData_Online sessionContextData = new SessionContextData_Online(new SaxSessionContext_Web(100, Sax.Application.Online));
				ConfigureDatabaseConnection(sessionContextData, Sax.Database.Core);
				ConfigureDatabaseConnection(sessionContextData, Sax.Database.Support);
				sessionContexts.Add(sessionContextData.SessionContext.Index, sessionContextData);
				SessionContext = sessionContextData.SessionContext;

				// Data Cache console - to initialise refresh. Must be done for every Session Context.
				SaxDataCacheConsole dataCacheConsole = SaxGlobals.ConsoleHelper.GetDataCacheConsole(SessionContext);
			}
			catch (Exception exc)
			{
				SaLogger.Error(fn + " " + ExceptionUtil.GetLogMessage(exc));
			}
		}

		//-------------------------------------------------------------------
		private void ConfigureDatabaseConnection(SessionContextData_Online sessionContextData, Sax.Database databaseInstance)
		{
			String fn = GetType().Name + ".ConfigureDatabaseConnection";

			// Configure database connection.
			SaxAppConfig.DatabaseConfig databaseConfig = AppConfig.Databases.Databases.GetValue(databaseInstance, new SaxAppConfig.DatabaseConfig());
			SacsDatabaseConsole.OdbcConfig config = new SacsDatabaseConsole.OdbcConfig();
			config.location = databaseConfig.Location;
			config.user = databaseConfig.User;
			config.pword = databaseConfig.Password;
			SacsDatabase database = SacsDatabaseConsole.OpenOdbcDatabase(config);
			if (database.HasErrorState())
				SaLogger.Warn(fn + " " + databaseInstance.ToString() + " Database initialisation error: " + database.ErrorStateMessage);
			sessionContextData.Databases.Add(databaseInstance, database);
		}

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