using System;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Windows.Forms;
using Update.Util;

namespace Update.Config
{
    /// <summary>
    /// 目标配置
    /// </summary>
    public static class HostConfig
    {
        private static string m_DownLoadURL;
        public static string DownLoadURL
        {
            get
            {
                if(m_DownLoadURL==null)
                    m_DownLoadURL= HttpUtils.GetDownloadUrl(Const.Key);
                return m_DownLoadURL;
            }
        }


        private static string m_ExecutablePath;
        /// <summary>
        /// 获取目标文件路径 格式:D:\xx系统\wfy.exe
        /// </summary>
        public static string ExecutablePath
        {
            get { return m_ExecutablePath; }
        }
        
        private static string m_ExecutableDirectory;
        /// <summary>
        /// 获取目标文件的父文件夹 格式:D:\xx系统\
        /// </summary>
        public static string ExecutableDirectory
        {
            get
            {
                return m_ExecutableDirectory ?? (m_ExecutableDirectory = FilePathUtil.GetDirectoryName(ExecutablePath));
            }
        }

        private static string m_ExecutableName;
        /// <summary>
        /// 获取目标文件的短文件名 格式:wfy.exe
        /// </summary>
        public static string ExecutableName
        {
            get { return m_ExecutableName ?? (m_ExecutableName = Path.GetFileName(ExecutablePath)); }
        }

        private static Version m_CurrentVersion;
        /// <summary>
        /// 获取目标进程文件的文件版本
        /// </summary>
        public static Version CurrentVersion
        {
            get
            {
                if (m_CurrentVersion == null)
                {
                    //FileInfo fileInfo=new FileInfo(Assembly.GetExecutingAssembly().Location);
                    //var dirPath = fileInfo.DirectoryName;
                    //Program Files文件夹, Copy 需要管理员权限,更改为临时目录
                    var dirPath = System.Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
                    string copyDestPath = Path.Combine(dirPath, ExecutableName);
                    //由于加载的程序集无法卸载，所以将dll，Copy出来
                    try
                    {
                        File.Copy(ExecutablePath, copyDestPath, true);
                    }
                    catch (Exception e)
                    {
                        //MessageBox.Show("Copy Fail"+e.StackTrace);
                    }
                    
                    if (File.Exists(copyDestPath))
                        m_CurrentVersion = Assembly.ReflectionOnlyLoadFrom(copyDestPath).GetName().Version;

                }
                return m_CurrentVersion;
            }
        }

        /// <summary>
        /// 初始化目标文件配置
        /// </summary>
        /// <param name="executablePath">目标文件路径</param>
        public static void Init(string executablePath)
        {
            m_ExecutablePath = executablePath;
            m_ExecutableDirectory = null;
            m_ExecutableName = null;
            m_CurrentVersion = null;
        }

        /// <summary>
        /// 刷新目标程序版本
        /// </summary>
        public static void RefreshVersion()
        {
            m_CurrentVersion = null;
        }

    }
}