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

namespace Tango.LogViewer.UI.LogViewerFileParser
{
    public class ApplicationLogViewerParser : ILogViewerParser
    {
        public ApplicationLogViewerParser()
        {

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

            String logText = String.Empty;

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

                    logText = logs[i + 1];
                    var matches = Regex.Matches(logText, @"(?<=\[)(.*?)(?=\])");

                    MessageLogItem item = new MessageLogItem();
                    item.TimeStamp = new DateTime(datetime.Year, datetime.Month, datetime.Day, date.Hour, date.Minute, date.Second, date.Millisecond);
                    item.Category = (LogCategory)Enum.Parse(typeof(LogCategory), matches[0].ToString());
                    item.CallerFile = matches[1].ToString();
                    item.CallerMethodName = matches[2].ToString();
                    item.CallerLineNumber = int.Parse(matches[3].ToString());

                    int messageStartIndex = matches[3].Index + matches[3].Length + 2;

                    item.Message = logText.Substring(messageStartIndex, logText.Length - messageStartIndex);

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