using NLog;
using System.Collections.Generic;
using System.CommandLine;
using System.CommandLine.Invocation;
using System.Globalization;
using System.IO;
using System.Reflection;
using System.Text.Json;
using System.Threading;

namespace Barsik
{
    class Program
    {
        private static RegistersContainer registers;
        private static List<BaseMonitoringUnit> units;

		private static readonly Logger logger = LogManager.GetCurrentClassLogger();

		static void Main(string[] args)
        {
            CultureInfo.CurrentCulture = new CultureInfo("en-US");
            var rootCommand = new RootCommand();
            var runCommand = new Command("run")
            {
                new Option<string>("--config", () => "", "Path to configuration file")
            };
            runCommand.Handler = CommandHandler.Create<string>(RunService);
            rootCommand.AddCommand(runCommand);
            rootCommand.InvokeAsync(args).Wait();
        }

        static void RunService(string config)
		{
            Logging.Setup();
            logger.Info("Barsik monitoring service starting");

            registers = new RegistersContainer();
            var server = new ModbusServer(registers);
            units = new List<BaseMonitoringUnit>();

            if (string.IsNullOrEmpty(config))
            {
                string assemblyFolder = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
                config = Path.Combine(assemblyFolder, "barsik.json");
            }
            string configStr = File.ReadAllText(config);
            int port = 0;
            using (JsonDocument doc = JsonDocument.Parse(configStr))
            {
                var root = doc.RootElement;
                port = root.GetProperty("Port").GetInt32();
                foreach (var unitElement in root.GetProperty("Units").EnumerateArray())
                {
                    var unit = BaseMonitoringUnit.Create(unitElement, registers);
                    if (unit != null)
                    {
                        units.Add(unit);
                        Thread unitThread = new Thread(new ThreadStart(unit.Run));
                        unitThread.Start();
                    }
                }
            }
            logger.Info("Configuration loaded, we have " + units.Count + " units");
            server.Port = port;
            server.Run();
            logger.Info("Exiting");
        }
    }
}