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using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.Serialization;
using System.Xml.Serialization;
namespace V3.Data.Internal
{
/// <summary>
/// Default implementation if ISaveGameManager.
/// </summary>
// ReSharper disable once ClassNeverInstantiated.Global
internal sealed class SaveGameManager : ISaveGameManager
{
private readonly IPathManager mPathManager;
private const int CurrentVersion = 1;
private readonly XmlSerializer mFormatter = new XmlSerializer(typeof(SaveGame));
/// <summary>
/// Creates a new SaveGameManager. The save game directory must already
/// be created.
/// </summary>
public SaveGameManager(IPathManager pathManager)
{
mPathManager = pathManager;
}
/// <summary>
/// Creates and persists a new save game of the given data with the
/// title.
/// </summary>
/// <param name="gameState">the data to store</param>
public void CreateSaveGame(GameState gameState)
{
var saveGame = new SaveGame(DateTime.Now, CurrentVersion, gameState);
var fileName = GetUniqueFileName();
var stream = new FileStream(fileName, FileMode.Create, FileAccess.Write);
mFormatter.Serialize(stream, saveGame);
stream.Close();
}
/// <summary>
/// Loads all available save games and returns them ordered by the
/// creation date.
/// </summary>
/// <returns>a list of all available save games, orderd by creation
/// data</returns>
public List<ISaveGame> GetSaveGames()
{
var saveGames = new List<ISaveGame>();
foreach (var file in Directory.GetFiles(mPathManager.SaveGameDirectory))
{
var stream = new FileStream(file, FileMode.Open, FileAccess.Read);
try
{
var saveGame = (ISaveGame)mFormatter.Deserialize(stream);
if (saveGame.Version == CurrentVersion)
saveGames.Add(saveGame);
}
catch (SerializationException)
{
// ignore so far
}
stream.Close();
}
saveGames.Sort();
return saveGames;
}
private string GetUniqueFileName()
{
var index = 1;
var fileName = GetFileName(index);
while (File.Exists(fileName))
{
index++;
fileName = GetFileName(index);
}
return fileName;
}
private string GetFileName(int index)
{
return $"{mPathManager.SaveGameDirectory}/{index:000}.xml";
}
}
}
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