//************************************************************************
//      https://github.com/yuzhengyang
//      author:     yuzhengyang
//      date:       2017.3.29 - 2017.6.10
//      desc:       文件操作工具
//      Copyright (c) yuzhengyang. All rights reserved.
//************************************************************************
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using Y.Utils.DataUtils.Collections;
using Y.Utils.DataUtils.UnitConvertUtils;

namespace Y.Utils.IOUtils.FileUtils
{
    /// <summary>
    /// 文件操作工具
    /// </summary>
    public class FileTool
    {
        /// <summary>
        /// 获取文件（单层目录）
        /// </summary>
        /// <param name="path">路径</param>
        /// <param name="pattern">通配符</param>
        /// <returns></returns>
        public static List<string> GetFile(string path, string pattern = "*")
        {
            if (Directory.Exists(path))
                try
                {
                    List<string> result = Directory.EnumerateFiles(path, pattern).ToList();
                    return result;
                }
                catch (Exception e) { }
            return null;
        }
        /// <summary>
        /// 获取文件（所有目录）
        /// </summary>
        /// <param name="path">路径</param>
        /// <param name="pattern">通配符</param>
        /// <returns></returns>
        public static List<string> GetAllFile(string path, string pattern = "*")
        {
            List<string> result = null;
            try
            {
                result = Directory.EnumerateFiles(path, pattern, SearchOption.AllDirectories).ToList();
            }
            catch (Exception e) { }
            return result;
        }
        /// <summary>
        /// 获取文件（所有目录）
        /// </summary>
        /// <param name="path">路径</param>
        /// <param name="pattern">通配符（支持多个通配符）</param>
        /// <returns></returns>
        public static List<string> GetAllFile(string path, string[] pattern)
        {
            List<string> result = new List<string>();
            if (!ListTool.IsNullOrEmpty(pattern))
            {
                foreach (var p in pattern)
                {
                    List<string> temp = GetAllFile(path, p);
                    if (!ListTool.IsNullOrEmpty(temp)) result.AddRange(temp);
                }
            }
            return result;
        }
        /// <summary>
        /// 获取文件（所有目录）
        /// </summary>
        /// <param name="paths">路径（支持多个路径）</param>
        /// <param name="patterns">通配符（支持多个通配符）</param>
        /// <returns></returns>
        public static List<string> GetAllFile(string[] paths, string[] patterns)
        {
            List<string> result = new List<string>();
            if (!ListTool.IsNullOrEmpty(paths))
            {
                foreach (var path in paths)
                {
                    if (!ListTool.IsNullOrEmpty(patterns))
                    {
                        foreach (var pattern in patterns)
                        {
                            List<string> temp = GetAllFile(path, pattern);
                            if (!ListTool.IsNullOrEmpty(temp)) result.AddRange(temp);
                        }
                    }
                    else
                    {
                        List<string> temp = GetAllFile(path);
                        if (!ListTool.IsNullOrEmpty(temp)) result.AddRange(temp);
                    }
                }
            }
            return result;
        }
        /// <summary>
        /// 获取文件（所有目录）（严格模式：从第一个.开始截取后缀）
        /// </summary>
        /// <param name="paths">路径（支持多个路径）</param>
        /// <param name="patterns">通配符（支持多个通配符）</param>
        /// <returns></returns>
        public static List<string> GetAllFileByExt(string[] paths, string[] patterns)
        {
            List<string> result = new List<string>();
            if (!ListTool.IsNullOrEmpty(paths))
            {
                foreach (var path in paths)
                {
                    List<string> temp = GetAllFile(path);
                    if (!ListTool.IsNullOrEmpty(temp)) result.AddRange(temp);
                }
            }
            if (!ListTool.IsNullOrEmpty(patterns) && !ListTool.IsNullOrEmpty(result))
            {
                for (int i = result.Count() - 1; i >= 0; i--)
                {
                    string ext = System.IO.Path.GetFileName(result[i]);
                    if (ext.IndexOf('.') >= 0)
                    {
                        ext = ext.Substring(ext.IndexOf('.'));
                    }
                    if (!patterns.Contains(ext)) result.RemoveAt(i);
                }
            }
            return result;
        }
        /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="file">文件路径</param>
        /// <returns></returns>
        public static void Delete(string file)
        {
            try
            {
                File.Delete(file);
            }
            catch (Exception e) { }
        }
        /// <summary>
        /// 删除文件（多个）
        /// </summary>
        /// <param name="files">文件路径（支持多个文件路径）</param>
        /// <returns></returns>
        public static void Delete(string[] files)
        {
            if (ListTool.HasElements(files))
            {
                foreach (var file in files)
                {
                    Delete(file);
                }
            }
        }
        /// <summary>
        /// 获取文件的大小（字节数）
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public static long Size(string fileName)
        {
            long result = -1;
            if (File.Exists(fileName))
            {
                try
                {
                    FileInfo fi = new FileInfo(fileName);
                    result = fi.Length;
                }
                catch (Exception e) { }
            }
            return result;
        }
        /// <summary>
        /// 获取多个文件的大小（字节数）
        /// </summary>
        /// <param name="files"></param>
        /// <returns></returns>
        public static long[] Size(List<string> files)
        {
            long[] result = new long[files.Count];
            for (int i = 0; i < result.Length; i++)
            {
                result[i] = Size(files[i]);
            }
            return result;
        }
        /// <summary>
        /// 获取文件大小（根据单位换算）
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="unit">B，KB，MB，GB</param>
        /// <returns></returns>
        public static double Size(string fileName, string unit)
        {
            return ByteConvertTool.Cvt(Size(fileName), unit);
        }
        /// <summary>
        /// 获取文件大小信息（自动适配）（如：1MB，10KB...）
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public static string SizeFormat(string fileName)
        {
            return ByteConvertTool.Fmt(Size(fileName));
        }
        /// <summary>
        /// 获取文件的MD5特征码
        /// </summary>
        /// <param name="file"></param>
        /// <returns></returns>
        public static string GetMD5(string file)
        {
            string result = string.Empty;
            if (!File.Exists(file)) return result;

            using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
            {
                HashAlgorithm algorithm = MD5.Create();
                byte[] hashBytes = algorithm.ComputeHash(fs);
                result = BitConverter.ToString(hashBytes).Replace("-", "");
            }
            return result;
        }
        /// <summary>
        /// 获取多个文件的MD5特征码
        /// </summary>
        /// <param name="file"></param>
        /// <returns></returns>
        public static string[] GetMD5(List<string> files)
        {
            string[] result = new string[files.Count];
            for (int i = 0; i < files.Count; i++)
            {
                result[i] = GetMD5(files[i]);
            }
            return result;
        }
    }
}