using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;

namespace FAtoPA
{
    class Config
    {
        // FSM settings
        public byte FSM_NetGroup { get; set; } = 1;
        public byte FSM_NetNode { get; set; } = 1;
        public byte FSM_PNA { get; set; } = 1;
        public String FSM_LocalIP { get; set; } = "0.0.0.0";
        public bool FSM_UseMulticast { get; set; } = true;
        public String FSM_MulticastIP { get; set; } = "239.192.0.1";
        public UInt16  FSM_MulticastPort { get; set; } = 25000; 

        public UInt16 Modbus_ListenPort { get; set; } = 502;
        public byte Modbus_DeviceID { get; set; } = 1;
        public UInt16 Modbus_MaxRegister { get; set; } = 2000;

        public String VX_TargetIP { get; set; } = "192.168.14.1";
        public UInt16 VX_TargetPort { get; set; } = 5000;

        public Config() { 
            String _configpath = GetConfigPath();
            if (File.Exists(_configpath)) {
                // Load Config
                if (Load())
                {
                    // do nothing
                    
                } else
                {
                   // save default config
                    Save();
                }
            } else
            {
                // save default config
               Save();
            }
        }

        public bool Save()
        {
            String _configPath = GetConfigPath();

            try
            {
                String jsonstring = JsonSerializer.Serialize(this);
                File.WriteAllText(_configPath, jsonstring);
                Console.WriteLine("Config saved to [" + _configPath+"]");
                return true;
            }
            catch (Exception ex)
            {
                Console.Out.WriteLine("Config Save to ["+_configPath+"] Error: " + ex.Message);  
            }
            return false;
        }

        public bool Load()
        {
            String _configPath = GetConfigPath();

            if (File.Exists(_configPath))
            {
                try
                {
                    string jsonstring = File.ReadAllText(_configPath);
                    Config? _loaded = JsonSerializer.Deserialize<Config>(jsonstring);
                    if (_loaded != null)
                    {
                        this.FSM_NetGroup = _loaded.FSM_NetGroup;
                        this.FSM_NetNode = _loaded.FSM_NetNode;
                        this.FSM_PNA = _loaded.FSM_PNA;
                        this.FSM_LocalIP = _loaded.FSM_LocalIP;
                        this.FSM_UseMulticast = _loaded.FSM_UseMulticast;
                        this.FSM_MulticastIP = _loaded.FSM_MulticastIP;
                        this.FSM_MulticastPort = _loaded.FSM_MulticastPort;
                        this.Modbus_ListenPort = _loaded.Modbus_ListenPort;
                        this.Modbus_DeviceID = _loaded.Modbus_DeviceID;
                        this.Modbus_MaxRegister = _loaded.Modbus_MaxRegister;
                        this.VX_TargetIP = _loaded.VX_TargetIP;
                        this.VX_TargetPort = _loaded.VX_TargetPort;
                        
                        Console.Out.WriteLine("Config Loaded from [" + _configPath + "]");
                        return true;
                    } else Console.Out.WriteLine("Config Load Error: File ["+ _configPath + "] is not valid Config.");
                } catch(Exception ex)
                {
                    Console.Out.WriteLine("Config Load from ["+_configPath+"] Error: " + ex.Message);
                }
            }
            else Console.Out.WriteLine("Config Load Error: File ["+ _configPath + "] not found.");
            return false;
        }

        private static String GetConfigPath()
        {
            String _configPath = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "FAtoPA");
            _configPath = System.IO.Path.Combine(_configPath, "config.json");
            return _configPath;
        }
    }
}