using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
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.IO;
using Sarand.Net.Standard.Base.Utils;
using Saxonite.Net.Core.Web.Admin.Models;
using Saxonite.Net.Standard.Base.App;
using Saxonite.Net.Standard.Base.Bus;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace Saxonite.Net.Core.Web.Admin.Controllers.System
{
	//=======================================================================
	// System - Ajax - Logs controller
	//=======================================================================
	partial class SystemController
	{
		//-------------------------------------------------------------------
		// Database data.
		private class LogFolderData
		{
			public String Name { get; set; }
		}
		private class LogFileData
		{
			public String Name { get; set; }
			public String UpdateFmt { get; set; }
			public long Size { get; set; }
		}

		//-------------------------------------------------------------------
		// Get Log Folder List ajax request.
		//-------------------------------------------------------------------
		private class AjaxResponse_LogFolderList : AjaxResponse_Data
		{
			// Construction.
			public AjaxResponse_LogFolderList(SaxModel_Admin model) : base(model) { }
			// Log file list.
			public List<LogFolderData> Folders { get; } = new List<LogFolderData>();
		}
		//-------------------------------------------------------------------
		/// <summary>
		/// Retrieve the list of folders under the root folder.
		/// <para>- These should correspond to applications (admin, api, online etc).</para>
		/// </summary>
		[HttpPost]
		[Route("System/Ajax/Logs/GetFolderList")]
		[Route("System/Ajax/Logs/GetFolders")]
		public IActionResult Ajax_GetLogFolderList(Model_System model)
		{
			String fn = GetType().Name + ".Ajax_GetLogFolderList";
			String messageTitle = Localiser["system.caption.logs"];
			AjaxResponse_LogFolderList responseData = new AjaxResponse_LogFolderList(model);

			// Validate session.
			if (!ValidUserSession)
				return GetAjaxResult_InvalidSession(responseData);

			// Identify folders in root log folder.
			String rootLogFolder = model.LoggingRootFolder;
			foreach (String folder in Directory.EnumerateDirectories(rootLogFolder))
			{
				String folderName = Path.GetFileName(folder);
				if (folderName.IsMatch("^(Online|Admin|Api)$", RegexOptions.IgnoreCase))
					responseData.Folders.Add(new LogFolderData() { Name = folderName });
			}

			// Complete response.
			responseData.Success = true;

			return Json(responseData);
		}

		//-------------------------------------------------------------------
		// Get Log Year Folder List ajax request.
		//-------------------------------------------------------------------
		private class AjaxResponse_LogYearList : AjaxResponse_Data
		{
			// Construction.
			public AjaxResponse_LogYearList(SaxModel_Admin model) : base(model) { }
			// Log file list.
			public List<LogFolderData> Years { get; } = new List<LogFolderData>();
		}
		//-------------------------------------------------------------------
		/// <summary>
		/// Retrieve the list of year folders under the selected folder.
		/// </summary>
		[HttpPost]
		[Route("System/Ajax/Logs/GetYearList")]
		[Route("System/Ajax/Logs/GetYears")]
		public IActionResult Ajax_GetLogYearList(Model_System model)
		{
			String fn = GetType().Name + ".Ajax_GetLogYearList";
			String messageTitle = Localiser["system.caption.logs"];
			AjaxResponse_LogYearList responseData = new AjaxResponse_LogYearList(model);

			// Validate session.
			if (!ValidUserSession)
				return GetAjaxResult_InvalidSession(responseData);

			// Store filter properties to session.
			SessionData_Admin.System.Logs.Filter.Folder = model.LogsFilter.Folder;
			SessionData_Admin.System.Logs.Filter.Year = "";
			SessionData_Admin.System.Logs.Filter.Month = "";

			// Identify folders in selected log folder.
			String logFolder = Path.Combine(model.LoggingRootFolder, model.LogsFilter.Folder);
			foreach (String folder in Directory.EnumerateDirectories(logFolder))
			{
				String folderName = Path.GetFileName(folder);
				if (folderName.IsMatch("^\\d{4}$"))
					responseData.Years.Add(new LogFolderData() { Name = folderName });
			}

			// Complete response.
			responseData.Success = true;

			return Json(responseData);
		}

		//-------------------------------------------------------------------
		// Get Log Month Folder List ajax request.
		//-------------------------------------------------------------------
		private class AjaxResponse_LogMonthList : AjaxResponse_Data
		{
			// Construction.
			public AjaxResponse_LogMonthList(SaxModel_Admin model) : base(model) { }
			// Log file list.
			public List<LogFolderData> Months { get; } = new List<LogFolderData>();
		}
		//-------------------------------------------------------------------
		/// <summary>
		/// Retrieve the list of year folders under the selected folder.
		/// </summary>
		[HttpPost]
		[Route("System/Ajax/Logs/GetMonthList")]
		[Route("System/Ajax/Logs/GetMonths")]
		public IActionResult Ajax_GetLogMonthList(Model_System model)
		{
			String fn = GetType().Name + ".Ajax_GetLogMonthList";
			String messageTitle = Localiser["system.caption.logs"];
			AjaxResponse_LogMonthList responseData = new AjaxResponse_LogMonthList(model);

			// Validate session.
			if (!ValidUserSession)
				return GetAjaxResult_InvalidSession(responseData);

			// Store filter properties to session.
			SessionData_Admin.System.Logs.Filter.Folder = model.LogsFilter.Folder;
			SessionData_Admin.System.Logs.Filter.Year = model.LogsFilter.Year;
			SessionData_Admin.System.Logs.Filter.Month = "";
			//SessionData_Admin.System.Logs.Filter.Month = model.LogsFilter.Month;

			// Identify folders in selected year folder.
			String logFolder = Path.Combine(model.LoggingRootFolder, model.LogsFilter.Folder, model.LogsFilter.Year);
			foreach (String folder in Directory.EnumerateDirectories(logFolder))
			{
				String folderName = Path.GetFileName(folder);
				if (folderName.IsMatch("^\\d{6}$"))
					responseData.Months.Add(new LogFolderData() { Name = folderName });
			}

			// Complete response.
			responseData.Success = true;

			return Json(responseData);
		}

		//-------------------------------------------------------------------
		// Get Log File List ajax request.
		//-------------------------------------------------------------------
		private class AjaxResponse_LogFileList : AjaxResponse_Data
		{
			// Construction.
			public AjaxResponse_LogFileList(SaxModel_Admin model) : base(model) { }
			// Log file list.
			public List<LogFileData> Files { get; } = new List<LogFileData>();
		}
		//-------------------------------------------------------------------
		[HttpPost]
		[Route("System/Ajax/Logs/GetFileList")]
		[Route("System/Ajax/Logs/GetFiles")]
		public IActionResult Ajax_GetLogFileList(Model_System model)
		{
			String fn = GetType().Name + ".Ajax_GetLogFileList";
			String messageTitle = Localiser["system.caption.logs"];
			AjaxResponse_LogFileList responseData = new AjaxResponse_LogFileList(model);

			// Validate session.
			if (!ValidUserSession)
				return GetAjaxResult_InvalidSession(responseData);

			// Store filter properties to session.
			SessionData_Admin.System.Logs.Filter.Folder = model.LogsFilter.Folder;
			SessionData_Admin.System.Logs.Filter.Year = model.LogsFilter.Year;
			SessionData_Admin.System.Logs.Filter.Month = model.LogsFilter.Month;

			// Identify folders in selected year folder.
			String logFolder = Path.Combine(model.LoggingRootFolder, model.LogsFilter.Folder, model.LogsFilter.Year, model.LogsFilter.Month);
			DirectoryInfo folder = new DirectoryInfo(logFolder);
			foreach (FileInfo file in folder.EnumerateFiles())
			{
				responseData.Files.Add(new LogFileData() { Name = file.Name, UpdateFmt = file.LastWriteTime.ToString("d-MMM-yy HH:mm"), Size = file.Length });
			}

			// Complete response.
			responseData.Success = true;

			return Json(responseData);
		}

		//-------------------------------------------------------------------
		// Get Log File ajax request.
		//-------------------------------------------------------------------
		private class AjaxResponse_LogFile : AjaxResponse_Data
		{
			// Construction.
			public AjaxResponse_LogFile(SaxModel_Admin model) : base(model) { }
			// Log file.
			public class LogFileData
			{
				public String Path { get; set; }
				public String Name { get; set; }
				public String Data { get; set; }
				public String Html { get; set; } = "";
			}
			public LogFileData File { get; } = new LogFileData();
		}
		//-------------------------------------------------------------------
		[HttpPost]
		[Route("System/Ajax/Logs/GetFile")]
		[Route("System/Ajax/Logs/GetLogFile")]
		public IActionResult Ajax_GetLogFile(Model_System model)
		{
			String fn = GetType().Name + ".Ajax_GetLogFile";
			String messageTitle = Localiser["system.caption.logs"];
			AjaxResponse_LogFile responseData = new AjaxResponse_LogFile(model);

			// Validate session.
			if (!ValidUserSession)
				return GetAjaxResult_InvalidSession(responseData);

			// Store filter properties to session.
			SessionData_Admin.System.Logs.Filter.Folder = model.LogsFilter.Folder;
			SessionData_Admin.System.Logs.Filter.Year = model.LogsFilter.Year;
			SessionData_Admin.System.Logs.Filter.Month = model.LogsFilter.Month;

			// Identify folders in selected year folder.
			responseData.File.Path = Path.Combine(model.LoggingRootFolder, model.LogsFilter.Folder, model.LogsFilter.Year, model.LogsFilter.Month, model.LogsFilter.Filename);
			responseData.File.Name = Path.GetFileName(responseData.File.Path);
			try
			{
				String[] fileLines = FileUtil.ReadAllFileLines(responseData.File.Path);
				responseData.File.Data = String.Join("\n", fileLines);
				// Construct html data.
				foreach (var fileLine in fileLines)
				{
					String line = fileLine;
					List<String> classNames = new List<string>();
					if (fileLine.IsMatch("^\t{2}"))
					{
						line = Regex.Replace(fileLine, "^\t+", "");
						classNames.Add("tab2");
					}
					if (fileLine.IsMatch("^\t"))
					{
						line = Regex.Replace(fileLine, "^\t", "");
						classNames.Add("tab");
					}
					if (line.IsMatch("\\d{8}:\\d{6}\\s+(error|err)\\s+", RegexOptions.IgnoreCase))
						classNames.Add("err");
					else if (line.IsMatch("\\d{8}:\\d{6}\\s+(warn|wrn)\\s+", RegexOptions.IgnoreCase))
						classNames.Add("wrn");
					else if (line.IsMatch("\\d{8}:\\d{6}\\s+(info|inf)\\s+", RegexOptions.IgnoreCase))
						classNames.Add("inf");
					responseData.File.Html += $"<div class='{String.Join(" ", classNames)}'>" + line + "</div>";
				}
			}
			catch (Exception exc)
			{
				SaLogger.Warn($"{SysUtil.Fn} {ExceptionUtil.GetLogMessage(exc, "reading log file", 0)}");
			}

			// Complete response.
			responseData.Success = true;

			return Json(responseData);
		}

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