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

namespace Estsh.Client.Common.FileManager
{
    /// <summary>
    /// 文件管理类
    /// </summary>
    public static class FileManager
    {
        /// <summary>
        /// 根据Xml获取文件列表
        /// </summary>
        /// <param name="xmlFilePath">XML路径</param>
        /// <returns></returns>
        public static List<FileInfoAlias> LoadXmlFileLists(string xmlFilePath, string directory)
        {
            List<FileInfoAlias> fileInfos = new List<FileInfoAlias>();
            try
            {
                XmlSerializer xmlSerializer = new XmlSerializer(typeof(List<FileInfoAlias>));
                TextReader reader = new StreamReader(xmlFilePath);
                fileInfos = xmlSerializer.Deserialize(reader) as List<FileInfoAlias>;
                reader.Close();
            }
            catch (Exception ex)
            {
                return null;
            }

            return fileInfos;
        }

        /// <summary>
        /// 根据文件列表序列号成Xml文件
        /// </summary>
        /// <param name="xmlFilePath">XML路径</param>
        /// <returns></returns>
        public static bool SaveFileListsToXml(string xmlFilePath, string directory, List<FileInfo> fileInfos)
        {
            try
            {

                XmlSerializer xmlSerializer = new XmlSerializer(typeof(List<FileInfo>));
                TextWriter writer = new StreamWriter(xmlFilePath);
                xmlSerializer.Serialize(writer, fileInfos);
                writer.Close();
            }
            catch (Exception ex)
            {
                return false;
            }

            return true;
        }

        private static List<FileInfoAlias> FileConvert(List<FileInfo> fileInfos)
        {
            List<FileInfoAlias> fileInfoAliases = new List<FileInfoAlias>();
            FileInfoAlias fileInfoAlias;
            foreach (var fileInfo in fileInfos)
            { 
                fileInfoAlias = new FileInfoAlias();
                fileInfoAlias.FileName = fileInfo.Name;
                fileInfoAlias.Size = fileInfo.Length;
                fileInfoAlias.LastWriteTime = fileInfo.LastWriteTime;
                if (FileVersionInfo.GetVersionInfo(fileInfo.FullName) != null) {
                    fileInfoAlias.Version = FileVersionInfo.GetVersionInfo(fileInfo.FullName).FileVersion;
                }

                fileInfoAliases.Add(fileInfoAlias);
            }
            return fileInfoAliases;
        }

        /// <summary>
        /// 获取本地文件清单
        /// </summary>
        /// <param name="BaseDirectory">根目录</param>
        /// <param name="directory">目录</param>
        /// <param name="List<FileInfo>">The file infos.</param>
        public static List<FileInfo> GetLocalFileInfo(string BaseDirectory, string directory)
        {
            string currentPath = BaseDirectory + "\\";
            List<FileInfo> fileInfos = new List<FileInfo>();

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

            DirectoryInfo dirInfo = new DirectoryInfo(currentPath + directory);
            
            DirectoryInfo[] subDirInfo = dirInfo.GetDirectories();
            // 递归调用
            foreach (DirectoryInfo tempDirInfo in subDirInfo)
            {
                fileInfos.AddRange(GetLocalFileInfo(BaseDirectory, directory + "/" + tempDirInfo.Name));
            }

            fileInfos.AddRange(dirInfo.GetFiles().ToList<FileInfo>());
            return fileInfos;
        }

        /// <summary>
        /// 获取本地文件清单
        /// </summary>
        /// <param name="directory">目录</param>
        /// <param name="List<FileInfo>">The file infos.</param>
        public static List<FileInfo> GetLocalFileInfo(string directory)
        {
            return GetLocalFileInfo(AppDomain.CurrentDomain.BaseDirectory, directory);
        }

        /// <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 List<FileInfo> GetLocalFileInfo(List<FileInfo> serverInfos)
        {
            string currentPath = AppDomain.CurrentDomain.BaseDirectory;
            List<FileInfo> LocalInfos = new List<FileInfo>();
            foreach (FileInfo fi in serverInfos)
            {
                string LocalFileName = Path.Combine(currentPath, Path.GetFileName(fi.Name));
                if (File.Exists(LocalFileName))
                {
                    LocalInfos.Add(new FileInfo(LocalFileName));
                }
            }

            return LocalInfos;
        }

        /// <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 List<FileInfo> GetUpdateFileLists(List<FileInfo> serverInfos, List<FileInfo> localInfos)
        {
            List<FileInfo> updateFileLists = new List<FileInfo>();
            bool NeedUpdateFlag = false;

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

                foreach (FileInfo tempLocalInfo in localInfos)
                {
                    // 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.Add(tempServerInfo);
                }
            }
            return updateFileLists;
        }

        
        [Serializable]
        class FileInfoAlias
        {
            /// <summary>
            /// 文件名称
            /// </summary>
            public string FileName { get; set; }
            /// <summary>
            /// 文件大小
            /// </summary>
            public long Size { get; set; }
            /// <summary>
            /// 文件最后修改时间
            /// </summary>
            public DateTime LastWriteTime { get; set; }
            /// <summary>
            /// 文件版本
            /// </summary>
            public string Version { get; set; }
        }

    }
}