using System;
using System.Collections.Generic;
using System.Text;
using System.Xml.Serialization;
using System.IO;
using System.Diagnostics;

namespace Estsh.Client.Common.FileUtil
{
    /// <summary>
    /// 文件管理类
    /// </summary>
    public static class FileManager
    {
        /// <summary>
        /// 根据xml获得文件列表信息
        /// </summary>
        /// <param name="xmlFilePath">XML文件路径</param>
        /// <returns></returns>
        public static FileInfos LoadXmlFileLists(string xmlFilePath)
        {
            FileInfos fileInfos = new FileInfos();

            try
            {
                XmlSerializer xmlSerializer = new XmlSerializer(typeof(FileInfos));
                TextReader reader = new StreamReader(xmlFilePath);
                fileInfos = xmlSerializer.Deserialize(reader) as FileInfos;
                reader.Close();
            }
            catch
            {
                return null;
            }

            return fileInfos;
        }

        /// <summary>
        /// 根据文件列表信息生成XML信息
        /// </summary>
        /// <param name="xmlFilePath"></param>
        /// <returns></returns>
        public static bool SaveFileListsToXml(string xmlFilePath, FileInfos fileInfos)
        {
            try
            {
                XmlSerializer xmlSerializer = new XmlSerializer(typeof(FileInfos));
                TextWriter writer = new StreamWriter(xmlFilePath);
                xmlSerializer.Serialize(writer, fileInfos);
                writer.Close();
            }
            catch
            {
                return false;
            }

            return true;
        }

        public static void GetLocalFileInfo(string BaseDirectory, string directory, ref FileInfos fileInfos)
        {
            string currentPath = BaseDirectory + "\\";

            if (!Directory.Exists(currentPath + directory))
            {
                return;
            }

            FileInfo localInfo;
            DirectoryInfo dirInfo = new DirectoryInfo(currentPath + directory);
            System.IO.FileInfo[] fi = dirInfo.GetFiles();

            foreach (System.IO.FileInfo info in fi)
            {
                localInfo = new FileInfo();
                localInfo.Name = directory + "/" + info.Name;
                localInfo.Size = info.Length;
                localInfo.LastWriteTime = info.LastWriteTime;
                System.Diagnostics.FileVersionInfo fvi =
                    System.Diagnostics.FileVersionInfo.GetVersionInfo(info.FullName);
                localInfo.Version = fvi.FileVersion;
                fileInfos.Infos.Add(localInfo);
            }

            DirectoryInfo[] subDirInfo = dirInfo.GetDirectories();

            foreach (DirectoryInfo tempDirInfo in subDirInfo)
            {
                GetLocalFileInfo(BaseDirectory, directory + "/" + tempDirInfo.Name, ref fileInfos);
            }
        }

        /// <summary>
        /// 根据 FILE SERVER 上的文件列表生成本地的文件列表
        /// </summary>
        /// <param name="serverInfos"></param>
        public static FileInfos GetLocalFileInfo(FileInfos serverInfos)
        {
            string currentPath = AppDomain.CurrentDomain.BaseDirectory;

            FileInfos LocalInfos = new FileInfos();

            foreach (FileInfo fi in serverInfos.Infos)
            {
                string LocalFileName = Path.Combine(currentPath, Path.GetFileName(fi.Name));

                if (File.Exists(LocalFileName))
                {
                    System.IO.FileInfo lfi = new System.IO.FileInfo(LocalFileName);
                    FileInfo LocalFileInfo = new FileInfo();
                    LocalFileInfo.Name = lfi.Name;
                    LocalFileInfo.Size = lfi.Length;
                    LocalFileInfo.LastWriteTime = lfi.LastWriteTime;
                    System.Diagnostics.FileVersionInfo fvi =
                        System.Diagnostics.FileVersionInfo.GetVersionInfo(lfi.FullName);
                    LocalFileInfo.Version = fvi.FileVersion;
                    LocalInfos.Infos.Add(LocalFileInfo);
                }
            }

            return LocalInfos;
        }

        /// <summary>
        /// 获得本地文件信息
        /// </summary>
        /// <param name="directory"></param>
        /// <param name="fileInfos">The file infos.</param>
        public static void GetLocalFileInfo(string directory, ref FileInfos fileInfos)
        {
            string currentPath = AppDomain.CurrentDomain.BaseDirectory + "\\";

            if (!Directory.Exists(currentPath + directory))
            {
                return;
            }

            FileInfo localInfo;
            DirectoryInfo dirInfo = new DirectoryInfo(currentPath + directory);
            System.IO.FileInfo[] fi = dirInfo.GetFiles();

            foreach (System.IO.FileInfo info in fi)
            {
                localInfo = new FileInfo();
                localInfo.Name = directory + "/" + info.Name;
                localInfo.Size = info.Length;
                localInfo.LastWriteTime = info.LastWriteTime;
                System.Diagnostics.FileVersionInfo fvi =
                    System.Diagnostics.FileVersionInfo.GetVersionInfo(info.FullName);
                localInfo.Version = fvi.FileVersion;
                fileInfos.Infos.Add(localInfo);
            }

            DirectoryInfo[] subDirInfo = dirInfo.GetDirectories();

            foreach (DirectoryInfo tempDirInfo in subDirInfo)
            {
                GetLocalFileInfo(directory + "/" + tempDirInfo.Name, ref fileInfos);
            }
        }

        /// <summary>
        /// 根据 FILE SERVER 上的文件列表比较本机上的文件列表，获取要更新的文件清单
        /// </summary>
        /// <param name="serverInfos">FILE SERVER 上的文件列表</param>
        /// <param name="localInfos">本机生成的文件列表</param>
        /// <returns>需要更新的文件列表</returns>
        public static FileInfos GetUpdateFileLists(FileInfos serverInfos, FileInfos localInfos)
        {
            FileInfos updateFileLists = new FileInfos();
            bool NeedUpdateFlag = false;

            foreach (FileInfo tempServerInfo in serverInfos.Infos)
            {
                NeedUpdateFlag = true;

                foreach (FileInfo tempLocalInfo in localInfos.Infos)
                {
                    // 根据相同的文件名进行比较
                    if (Path.GetFileName(tempLocalInfo.Name) == Path.GetFileName(tempServerInfo.Name))
                    {
                        // 比较文件属性
                        if (tempLocalInfo.CompareTo(tempServerInfo) >= 0)
                        {
                            NeedUpdateFlag = false;
                            break;
                        }
                    }
                }
                // 需要更新
                if (NeedUpdateFlag)
                {
                    updateFileLists.Infos.Add(tempServerInfo);
                }
            }

            return updateFileLists;
        }
    }
}