using System.Collections.Generic;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace MU3.Data;

public class patch_DataStudioManager: DataStudioManager {
    public static bool needSave;
    private static string _fileName;
    private static Dictionary<string, object> _dataCache;

    private static extern bool orig_Deserialize<T>(string filePath, out T dsr) where T : new();

    private static void initCache() {
        using IniFile iniFile = new("mu3.ini");
        var dir = iniFile.getValue("Extra", "CacheDir", ".");
        Directory.CreateDirectory(dir);
        _fileName = Path.Combine(dir, "data_cache.bin");

        if(File.Exists(_fileName)) {
            System.Console.WriteLine("Loading data cache...");
            using FileStream serializationStream = File.OpenRead(_fileName);
            _dataCache = (Dictionary<string, object>)new BinaryFormatter().Deserialize(serializationStream);
            return;
        }
        _dataCache = new();
    }

    private static void saveCache() {
        if(_fileName == "") {
            return;
        }
        if(File.Exists(_fileName)) {
            File.Delete(_fileName);
        }
        using FileStream serializationStream = File.OpenWrite(_fileName);
        new BinaryFormatter().Serialize(serializationStream, _dataCache);
    }

    private static bool Deserialize<T>(string filePath, out T dsr) where T : new() {
        if(_dataCache == null) {
            initCache();
        }
        if(_dataCache.ContainsKey(filePath)) {
            dsr = (T)_dataCache[filePath];
            return true;
        }
        if(orig_Deserialize(filePath, out dsr)) {
            needSave = true;
            _dataCache.Add(filePath, dsr);
            return true;
        }
        return false;
    }

    public extern bool orig_IsLoaded();

    public new bool IsLoaded() {
        if(orig_IsLoaded()) {
            if(needSave) {
                System.Console.WriteLine("Saving data cache...");
                saveCache();
            }
            return true;
        }
        return false;
    }
}