// ***********************************************************************
// Assembly         : GeneratorCode
// Author           : 黄昕 <hzhuangxin01@corp.netease.com>
// Created          : 02-15-2019
//
// Last Modified By : 黄昕 <hzhuangxin01@corp.netease.com>
// Last Modified On : 02-20-2019
// ***********************************************************************
// <copyright file="NConfig.cs" company="NetEase">
//     Copyright ©  2019
// </copyright>
// <summary></summary>
// ***********************************************************************

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
{
    /// <summary>
    ///     Class NConfig.
    /// </summary>
    public static class NConfig
    {
        /// <summary>
        ///     Delegate ConfigChangedHandle
        /// </summary>
        public delegate void ConfigChangedHandle();

        /// <summary>
        ///     The CFG file name
        /// </summary>
        private static readonly string _cfgFileName = @".\config.ini";

        /// <summary>
        ///     The CFG data
        /// </summary>
        private static IniData _cfgData;

        /// <summary>
        ///     Occurs when [on configuration changed].
        /// </summary>
        public static event ConfigChangedHandle OnConfigChanged;

        /// <summary>
        ///     Gets the CFG value.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="segName">Name of the segment.</param>
        /// <param name="keyName">Name of the key.</param>
        /// <param name="defValue">The definition value.</param>
        /// <returns>T.</returns>
        public static T GetCfgValue<T>([NotNull] string segName, [NotNull] string keyName, T defValue = default(T))
        {
            var ret = defValue;

            if (_cfgData.Equals(null)) return ret;
            
            try
            {
                string val;

                
                if (_cfgData.TryGetKey(segName + _cfgData.SectionKeySeparator + keyName, out val))
                {
                    ret = (T)Convert.ChangeType(val, typeof(T));
                }
                
            }
            catch (Exception e)
            {
                Trace.WriteLine("[" + _cfgData[segName][keyName] + "] :" + e.Message);
                ret = defValue;
            }

            return ret;
        }

        /// <summary>
        ///     Initializes the configure.
        /// </summary>
        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
            {
                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();
        }

        /// <summary>
        ///     Configurations the changed.
        /// </summary>
        private static void ConfigChanged()
        {
            OnConfigChanged?.Invoke();
        }

        /// <summary>
        ///     Loads the CFG from file.
        /// </summary>
        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");
                }

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