using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Tango.Integration.Operation;
using Tango.Logging;
using Tango.Settings;

namespace Tango.Integration.Logging
{
    public class EmbeddedLogFileParser : ILogFileParser<EmbeddedLogItem>
    {
        public List<LogFile> GetLogFiles()
        {
            List<LogFile> logFiles = new List<LogFile>();

            FileLogger logger = MachineOperator.EmbeddedLogManager.RegisteredLoggers.FirstOrDefault(x => x.GetType() == typeof(FileLogger)) as FileLogger;

            String logFile = logger != null ? logger.LogFile : null;
            HashSet<string> dateStrings = new HashSet<string>();
            if (Directory.Exists(MachineOperator.EmbeddedLogsFolder))
            {
                foreach (var file in Directory.GetFiles(MachineOperator.EmbeddedLogsFolder, "*.log").Where(x => x != logFile))
                {
                    try
                    {
                        String dateString = Path.GetFileNameWithoutExtension(file).Replace(MachineOperator.EmbeddedLogsTag + "-", "");
                        int indexPos = dateString.IndexOf(FileLogger.FILE_SET_EXTENSION);
                        int indexOfFile = 0;
                        if (indexPos > 0)
                        {
                            string fileNameIndex = dateString.Substring(indexPos + FileLogger.FILE_SET_EXTENSION.Length);
                            int.TryParse(fileNameIndex, out indexOfFile);
                            dateString = dateString.Substring(0, indexPos);
                        }
                        if (!dateStrings.Contains(dateString))
                        {
                            dateStrings.Add(dateString);
                            DateTime date = DateTime.ParseExact(dateString, "dd-MM-yyyy_HH-mm-ss", CultureInfo.InvariantCulture);
                            logFiles.Add(new LogFile() { DateTime = date, File = file, PartOfSet = indexOfFile > 0, });
                        }
                    }
                    catch (Exception ex)
                    {
                        LogManager.Default.Log(ex, $"Could not load embedded log file {Path.GetFileName(file)}");
                    }
                }
            }

            return logFiles;
        }

        public List<EmbeddedLogItem> Parse(LogFile logFile)
        {
            List<EmbeddedLogItem> logItems = new List<EmbeddedLogItem>();
            List<LogFile> logFiles = new List<LogFile>();
            FileLogger logger = LogManager.Default.RegisteredLoggers.FirstOrDefault(x => x.GetType() == typeof(FileLogger)) as FileLogger;
            if (logFile.PartOfSet)
            {
                string fileName = Path.GetFileNameWithoutExtension(logFile.File);
                string extension = Path.GetExtension(logFile.File);
                int indexPos = fileName.IndexOf(FileLogger.FILE_SET_EXTENSION);
                if (indexPos > 0)
                {
                    fileName = fileName.Substring(0, indexPos);
                }
                string[] fileEntries = Directory.GetFiles(FileLogger.DefaultLogsFolder, $"{fileName}*{extension}").Where(x => Path.GetFileName(x).StartsWith(logger.Tag) && x != logger.LogFile).OrderBy(x => x).ToArray();
                foreach (var file in fileEntries)
                {
                    Parse(file, logFile.DateTime, ref logItems);
                }
            }
            else
            {
                Parse(logFile.File, logFile.DateTime, ref logItems);
            }

            return logItems;
        }
        public void Parse(string file, DateTime datetime, ref List<EmbeddedLogItem> logItems)
        {
            String text = File.ReadAllText(file);
            var logs = Regex.Split(text, @"(\[\d{2}:\d{2}:\d{2}.\d{2}\])");

            for (int i = 1; i < logs.Length; i += 2)
            {
                try
                {
                    DateTime date = DateTime.ParseExact(logs[i].Replace("[", "").Replace("]", ""), "HH:mm:ss.ff", CultureInfo.InvariantCulture);
                    String rest = logs[i + 1];

                    var entries = Regex.Split(rest, @"\[(.*?)\]");

                    EmbeddedLogItem item = new EmbeddedLogItem(new PMR.Debugging.StartDebugLogResponse()
                    {
                        Category = (PMR.Debugging.DebugLogCategory)Enum.Parse(typeof(PMR.Debugging.DebugLogCategory), entries[1]),
                        FileName = entries[3],
                        LineNumber = int.Parse(entries[5]),
                        ModuleId = int.Parse(entries[7]),
                        Filter = int.Parse(entries[9]),
                        Message = new String(entries[10].Skip(2).ToArray())
                    });

                    item.TimeStamp = new DateTime(datetime.Year, datetime.Month, datetime.Day, date.Hour, date.Minute, date.Second, date.Millisecond);

                    logItems.Add(item);
                }
                catch (Exception ex)
                {
                    LogManager.Default.Log(ex, "Could not parse log line: " + logs[i]);
                }
            }
        }

        public List<EmbeddedLogItem> Parse(string file, DateTime fileDate)
        {
            List<EmbeddedLogItem> logs = new List<EmbeddedLogItem>();
            Parse(file, fileDate, ref logs);
            return logs;
        }
    }
}