using System;
using System.Collections.Generic;
using System.Diagnostics;
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; } = 2;
        public byte FSM_NetNode { get; set; } = 1;
        public byte FSM_PNA { get; set; } = 2;
        public String FSM_LocalIP { get; set; } = "192.168.10.23";
        public bool FSM_UseMulticast { get; set; } = false;
        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;
        private String _configpath = "";

        public Config() { 
            _configpath = GetConfigPath();
            // kalau belum ada, create default
            if (!File.Exists(_configpath)) Save();
        }

        public Boolean FileIsExist() { return File.Exists(_configpath); }

        public bool Save()
        {
            
            Debug.WriteLine("Will Save Config to [" + _configpath + "]");

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

        public bool Load()
        {

            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;
                        
                        Debug.WriteLine("Config Loaded from [" + _configpath + "]");
                        return true;
                    } else Debug.WriteLine("Config Load Error: File ["+ _configpath + "] is not valid Config.");
                } catch(Exception ex)
                {
                    Debug.WriteLine("Config Load from ["+ _configpath + "] Error: " + ex.Message);
                }
            }
            else Debug.WriteLine("Config Load Error: File ["+ _configpath + "] not found.");
            return false;
        }

        private static String GetConfigPath()
        {
            String _xx = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "FAtoPA");
            Debug.WriteLine("Config Path: " + _xx);
            if (!Directory.Exists(_xx)) {
                try
                {
                    Directory.CreateDirectory(_xx);
                }
                catch (Exception ex)
                {
                    Debug.WriteLine("Config Path Error: " + ex.Message);
                }
            }
            
            return System.IO.Path.Combine(_xx, "config.json");
        }
    }
}