using DTS.Common.Utilities.Logging;
using System;
using System.Diagnostics;
using System.IO;
using static DTS.Common.Utilities.Logging.APILogger;

namespace DbAPI.Logging
{
    internal class LogManager
    {
        public static Sink DBAPILogWriter;
        private static TextLogger _LogWriter;
        private static object MyLock = new object();
        private static int _MinLog = (int)(TraceEventType.Error | TraceEventType.Warning);
        public enum LogEvents
        {
            Message,
            Connections,
            Login,
            Information,
            DataRecorders,
            Graphs,
            CalculatedChannels,
            Sensors,
            TestSetups,
            RegionsOfInterest,
            Tags
        }
        public static void Initialize(int logSize, string path, int minLog)
        {
            lock (MyLock)
            {
                if (null != _LogWriter) { return; }
                _MinLog = minLog;
                _LogWriter = new TextLogger(Path.Combine(path, "DB.log"), OnWriteException, logSize);
                _LogWriter.ReRollLog = true;
                _LogWriter.LogStartMessage = GetLogStartMessage();
                DBAPILogWriter = LogMsg;
            }
        }
        public static void Log(TraceEventType eventType, LogEvents logEvent, string msg)
        {
            if ((_MinLog & (int)eventType) != (int)eventType) { return; } //don't log
            var dt = DateTime.Now;
            LogMsg($"{dt.Year}-{dt.Month:00}-{dt.Day:00} {dt.Hour:00}:{dt.Minute:00}:{dt.Second:00}.{dt.Millisecond:000} {eventType} - {logEvent} - {msg}");
        }
        public static void OnWriteException(Exception ex)
        {
            Console.Error.WriteLine(ex.Message);
        }
        private static void LogMsg(string msg)
        {
            try
            {
                _LogWriter.LogMessage(msg);
            }
            catch (Exception) { }
        }
        private static string GetLogStartMessage()
        {
            return string.Format("DB API\r\n" +
                $"OS:          {Environment.OSVersion}\r\n" +
                $"MachineName: {Environment.MachineName}\r\n" +
                $"Environment: {Environment.Version} \r\n\n" +
                "=====================================\r\n");
        }
    }
}