Scriptum/Assets/Scripts/REFACTORING/Application/Panel/Inventory/SaveInventoryManager.cs

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

public class SaveInventoryManager : SaveModelSystem<IndexValuePair<int, EquippableItemPrefabAsset>>
{
    public override bool SaveModelItem(IndexValuePair<int, EquippableItemPrefabAsset> model)
    {
        return base.SaveModelItem(model);
    }

    public override bool SaveModelList(List<IndexValuePair<int, EquippableItemPrefabAsset>> list)
    {
        BinaryFormatter formatter = new BinaryFormatter();

        Debug.Log("Saved Inventory at " + Path);

        if (!Directory.Exists(Path)) Directory.CreateDirectory(Path);

        /* Main logic of  conversion data format */
        var data = ConvertObjectsListToListOfDataModels(list);

        FileStream stream = new FileStream(
            Path + GetFileName(ObjectListName),
            FileMode.Create
        );

        formatter.Serialize(stream, data);
        stream.Close();

        return true;
    }

    public override IndexValuePair<int, EquippableItemPrefabAsset> LoadModelItem()
    {
        return base.LoadModelItem();
    }

    public override List<IndexValuePair<int, EquippableItemPrefabAsset>> LoadModelList()
    {
        string path = Path + GetFileName(ObjectListName);

        if (File.Exists(path))
        {
            BinaryFormatter formatter = new BinaryFormatter();
            FileStream stream = new FileStream(path, FileMode.Open);

            List<IndexValuePair<int, EquippableItemPrefabAssetData>> questsList = formatter.Deserialize(stream) as List<IndexValuePair<int, EquippableItemPrefabAssetData>>;
            stream.Close();

            return ConvertListOfDataModelsToListOfObject(questsList);
        }
        else
        {
            Debug.Log("Save file not found in " + path);
        }

        return new List<IndexValuePair<int, EquippableItemPrefabAsset>>();
    }

    // Support function

    // 1. From model to data format
    private IndexValuePair<int, EquippableItemPrefabAssetData> ConvertObjectToDataModel(IndexValuePair<int, EquippableItemPrefabAsset> model)
    {
        return new IndexValuePair<int, EquippableItemPrefabAssetData>(model.Key, new EquippableItemPrefabAssetData(model.Value));
    }

    private List<IndexValuePair<int, EquippableItemPrefabAssetData>> ConvertObjectsListToListOfDataModels(List<IndexValuePair<int, EquippableItemPrefabAsset>> modelsList)
    {
        List<IndexValuePair<int, EquippableItemPrefabAssetData>> convertedList = new List<IndexValuePair<int, EquippableItemPrefabAssetData>>();

        foreach(IndexValuePair<int, EquippableItemPrefabAsset> model in modelsList)
        {
            convertedList.Add(ConvertObjectToDataModel(model));
        }

        return convertedList;
    }

    // 2. From data to model format
    private IndexValuePair<int, EquippableItemPrefabAsset> ConvertDataModelToObject(IndexValuePair<int, EquippableItemPrefabAssetData> dataModel)
    {
        return new IndexValuePair<int, EquippableItemPrefabAsset>(dataModel.Key, (EquippableItemPrefabAsset)dataModel.Value.MapDataToPrefabAssetModel());
    }

    private List<IndexValuePair<int, EquippableItemPrefabAsset>> ConvertListOfDataModelsToListOfObject(List<IndexValuePair<int, EquippableItemPrefabAssetData>> dataModelsList)
    {
        List<IndexValuePair<int, EquippableItemPrefabAsset>> convertedList = new List<IndexValuePair<int, EquippableItemPrefabAsset>>();

        foreach (IndexValuePair<int, EquippableItemPrefabAssetData> dataModel in dataModelsList)
        {
            convertedList.Add(ConvertDataModelToObject(dataModel));
        }

        return convertedList;
    }
}