using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Timers;
using IniParser;
using IniParser.Model;
using JetBrains.Annotations;

namespace GeneratorCode.Configure
{
    public static class NConfig
    {
        private static string _cfgFileName = @".\config.ini";

        private static IniData _cfgData = null;

        public delegate void ConfigChangedHandle();

        public static event ConfigChangedHandle OnConfigChanged;

        private static void ConfigChanged()
        {
            OnConfigChanged?.Invoke();
        }

        private static void LoadCfgFromFile()
        {
            try
            {
                if (!File.Exists(_cfgFileName))
                {
                    var fs = new FileStream(_cfgFileName, FileMode.Create, FileAccess.Write);
                    var ws = new StreamWriter(fs);
                    ws.WriteLine("; 应用程序配置文件\n");
                }

                FileIniDataParser iniPraser = new FileIniDataParser();
                iniPraser.Parser.Configuration.CommentString = ";";
                _cfgData = iniPraser.ReadFile(_cfgFileName);
                //Trace.WriteLine(_cfgData);
            }
            catch (Exception e)
            {
                Trace.WriteLine(e.Message);
            }
        }

        public static void InitConfigure()
        {
            var cfgTask = new List<string>();
            var appPath = Process.GetCurrentProcess().MainModule.FileName;
            
            Trace.WriteLine("Application: " + appPath);
            Trace.WriteLine("Directory: " + Path.GetDirectoryName(appPath));
            Trace.WriteLine("File: " + Path.GetFileName(appPath));

            var fw = new FileSystemWatcher(@"E:\", @"my.cfg")
            {
                NotifyFilter = NotifyFilters.FileName | NotifyFilters.LastWrite,
                //Filter = _cfgFileName,
                //Path = Path.GetDirectoryName(appPath),
                IncludeSubdirectories = false,
            };

            fw.Changed += (sender, e) =>
            {
                //if (Path.GetFileName(appPath) != _cfgFileName) return;

                lock (cfgTask)
                {
                    if (cfgTask.Contains(e.FullPath)) return;

                    cfgTask.Add(e.FullPath);
                }

                var tm = new Timer(1000) { AutoReset = false };

                tm.Elapsed += (obj, args) =>
                {
                    lock (cfgTask)
                    {
                        cfgTask.Remove(e.FullPath);
                        LoadCfgFromFile();
                        ConfigChanged();
                        // LogOut("File: " + e.FullPath + " ==> " + e.ChangeType.ToString() + "\n");
                    }
                };

                tm.Start();
            };

            fw.EnableRaisingEvents = true;

            LoadCfgFromFile();
        }

        public static T GetCfgValue<T>([NotNull] string secName, [NotNull] string keyName, T defValue = default(T))
        {
            var ret = defValue;

            if (_cfgData.Equals(null))
            {
                return ret;
            }

            try
            {
                ret = (T) Convert.ChangeType(_cfgData[secName][keyName], typeof(T));
            }
            catch(Exception e)
            {
                Trace.WriteLine("[" + _cfgData[secName][keyName] + "] :" + e.Message);
                ret = defValue;
                throw(e);
            }

            return ret;
        }
    }
}