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.Logging;

namespace Tango.MachineStudio.Logging.Parsing
{
    public class ApplicationLogFileParser : ILogFileParser<LogItemBase>
    {
        public List<LogFile> GetLogFiles()
        {
            List<LogFile> logFiles = new List<LogFile>();

            FileLogger logger = LogManager.Default.RegisteredLoggers.FirstOrDefault(x => x.GetType() == typeof(FileLogger)) as FileLogger;

            String logFile = logger != null ? logger.LogFile : null;

            foreach (var file in Directory.GetFiles(FileLogger.DefaultLogsFolder, "*.log").Where(x => Path.GetFileName(x).StartsWith("Tango.MachineStudio.UI") && x != logger.LogFile))
            {
                String dateString = Path.GetFileNameWithoutExtension(file).Replace("Tango.MachineStudio.UI-", "");
                DateTime date = DateTime.ParseExact(dateString, "dd-MM-yyyy_HH-mm-ss", CultureInfo.InvariantCulture);
                logFiles.Add(new LogFile() { DateTime = date, File = file });
            }

            return logFiles;
        }

        public List<LogItemBase> Parse(LogFile logFile)
        {
            List<LogItemBase> logItems = new List<LogItemBase>();

            String text = File.ReadAllText(logFile.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, @"\[(.*?)\]");

                    MessageLogItem item = new MessageLogItem();
                    item.TimeStamp = new DateTime(logFile.DateTime.Year, logFile.DateTime.Month, logFile.DateTime.Day, date.Hour, date.Minute, date.Second, date.Millisecond);
                    item.Category = (LogCategory)Enum.Parse(typeof(LogCategory), entries[1]);
                    item.CallerFile = entries[3];
                    item.CallerMethodName = entries[5];
                    item.CallerLineNumber = int.Parse(entries[7]);
                    item.Message = new String(entries[8].Skip(2).ToArray());

                    logItems.Add(item);
                }
                catch (Exception ex)
                {
                    //TODO: What to do now ?
                }
            }

            return logItems;
        }
    }
}