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using System;
using System.Collections.Generic;
using System.IO;
namespace IPA.Patcher
{
/// <summary>
/// A unit for backup. WIP.
/// </summary>
public class BackupUnit
{
private string Name { get; }
private readonly DirectoryInfo _backupPath;
private readonly PatchContext _context;
private readonly List<string> _files = new List<string>();
private readonly FileInfo _manifestFile;
private static string _ManifestFileName = "$manifest$.txt";
public BackupUnit(PatchContext context) : this(context, DateTime.Now.ToString("yyyy-MM-dd_h-mm-ss"))
{
}
private BackupUnit(PatchContext context, string name)
{
Name = name;
_context = context;
_backupPath = new DirectoryInfo(Path.Combine(_context.BackupPath, Name));
_manifestFile = new FileInfo(Path.Combine(_backupPath.FullName, _ManifestFileName));
}
public static BackupUnit FromDirectory(DirectoryInfo directory, PatchContext context)
{
var unit = new BackupUnit(context, directory.Name);
// Read Manifest
if (unit._manifestFile.Exists)
{
var manifest = File.ReadAllText(unit._manifestFile.FullName);
foreach (var line in manifest.Split(new[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries))
unit._files.Add(line);
}
else
{
foreach (var file in directory.GetFiles("*", SearchOption.AllDirectories))
{
if (file.Name == _ManifestFileName) continue;
var relativePath = file.FullName.Substring(directory.FullName.Length + 1);
unit._files.Add(relativePath);
}
}
return unit;
}
public void Add(string file)
{
Add(new FileInfo(file));
}
internal void Delete()
{
_backupPath.Delete(true);
}
/// <summary>
/// Adds a file to the list of changed files and backups it.
/// </summary>
/// <param name="file">the file to add</param>
public void Add(FileInfo file)
{
if(!file.FullName.StartsWith(_context.ProjectRoot))
{
Console.Error.WriteLine("Invalid file path for backup! {0}", file);
return;
}
var relativePath = file.FullName.Substring(_context.ProjectRoot.Length + 1);
var backupPath = new FileInfo(Path.Combine(_backupPath.FullName, relativePath));
if(_files.Contains(relativePath))
{
Console.WriteLine("Skipping backup of {0}", relativePath);
return;
}
// Copy over
backupPath.Directory?.Create();
if (file.Exists)
{
file.CopyTo(backupPath.FullName);
}
else
{
// Make empty file
backupPath.Create().Close();
}
if (!File.Exists(_manifestFile.FullName))
_manifestFile.Create().Close();
var stream = _manifestFile.AppendText();
stream.WriteLine(relativePath);
stream.Close();
// Add to list
_files.Add(relativePath);
}
/// <summary>
/// Reverts the changes made in this unit.
/// </summary>
public void Restore()
{
foreach(var relativePath in _files)
{
Console.WriteLine("Restoring {0}", relativePath);
// Original version
var backupFile = new FileInfo(Path.Combine(_backupPath.FullName, relativePath));
var target = new FileInfo(Path.Combine(_context.ProjectRoot, relativePath));
if (backupFile.Exists)
{
if (backupFile.Length > 0)
{
Console.WriteLine(" {0} => {1}", backupFile.FullName, target.FullName);
target.Directory?.Create();
backupFile.CopyTo(target.FullName, true);
}
else
{
Console.WriteLine(" x {0}", target.FullName);
if(target.Exists)
{
target.Delete();
}
}
} else
{
Console.Error.WriteLine("Backup not found!");
}
}
}
}
}