using CommonLibrary;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;

namespace Mitria_Minecraft_Launcher
{
    public class AuditFile
    {
        private string GetFileHash(FileInfo fileInfo)
        {
            using (MD5 md5 = MD5.Create())
            {
                using (Stream stream = fileInfo.OpenRead())
                {
                    byte[] hashCode = md5.ComputeHash(stream);
                    StringBuilder hashStringBuilder = new StringBuilder();
                    foreach (byte b in hashCode)
                    {
                        hashStringBuilder.AppendFormat("{0:x2}", b);
                    }
                    return hashStringBuilder.ToString();
                }
            }
        }

        public List<FileDetail> GetLocalFileList(List<string> directorys)
        {
            List<DirectoryInfo> directoryInfos = new List<DirectoryInfo>();
            foreach (string directory in directorys)
            {
                System.IO.DirectoryInfo directoryInfo = new DirectoryInfo(CommonLibrary.Extensions.PathCombineW(Settings.UserLauncherConfig.GameDirectory, directory));
                directoryInfos.Add(directoryInfo);
            }
            return GetLocalFileList(directoryInfos);
        }

        public List<FileDetail> GetLocalFileList(List<DirectoryInfo> directorys)
        {
            List<FileDetail> resultFiles = new List<FileDetail>();
            List<FileInfo> files = new List<FileInfo>();
            foreach (var directory in directorys)
            {
                if (!directory.Exists)
                {
                    directory.Create();
                }
                files.AddRange(directory.GetFiles("*.*", SearchOption.AllDirectories).ToArray());
            }
            foreach (var file in files)
            {
                FileDetail fileDetail = new FileDetail();
                fileDetail.Directory = file.DirectoryName.Replace(Settings.UserLauncherConfig.GameDirectory + "\\", "").Replace("\\", "/");
                fileDetail.FileName = file.Name;
                fileDetail.FileSize = file.Length;
                fileDetail.HashCode = GetFileHash(file);

                resultFiles.Add(fileDetail);
            }
            return resultFiles;
        }

        public List<FileDetail> GetRemoveFiles(List<FileDetail> oldFiles, List<FileDetail> newFiles)
        {
            List<FileDetail> removeFiles = new List<FileDetail>();
            foreach (FileDetail oldFile in oldFiles)
            {
                if (!newFiles.Contains(oldFile))
                {
                    removeFiles.Add(oldFile);
                }
            }
            return removeFiles;
        }

        public List<FileDetail> GetNeedFiles(List<FileDetail> oldFiles, List<FileDetail> newFiles)
        {
            List<FileDetail> needFiles = new List<FileDetail>();
            foreach (FileDetail newFile in newFiles)
            {
                if (!oldFiles.Contains(newFile))
                {
                    needFiles.Add(newFile);
                }
            }
            return needFiles;
        }
    }
}