using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Runtime.Serialization;

using UnityEngine;

​

[System.Serializable]

public class BaseEntity

{

    public int ID;

}

​

[System.Serializable]

public class Level : BaseEntity

{

    public string Name;

    public int StarCount;

}

​

​

[System.Serializable]

public class EntityList<T> where T : BaseEntity

{

    public List<T> Entities;

}

​

public interface IRepository<T>

{

    void Add(T entity);

    void Remove(T entity);

    IEnumerable<T> GetEntities();

    T Find(int id);

}

​

public class Repository<T> : IRepository<T> where T : BaseEntity

{

    public readonly string FileName;

​

    public Repository(string fileName)

    {

        FileName = fileName;

    }

    public void Add(T entity)

    {

        string json = PlayerPrefs.GetString(FileName);

        var entities = JsonUtility.FromJson<EntityList<T>>(json);

        entities.Entities.Add(entity);

        Save(entities);

    }

​

    public void Remove(T entity)

    {

        var json = PlayerPrefs.GetString(FileName);

        var entities = JsonUtility.FromJson<EntityList<T>>(json);

        entities.Entities.Remove(entity);

        Save(entities);

    }

​

    private void Save(EntityList<T> entities)

    {

        var json = JsonUtility.ToJson(entities);

        PlayerPrefs.SetString(FileName, json);

    }

​

    public IEnumerable<T> GetEntities()

    {

        var json = PlayerPrefs.GetString(FileName);

        var entities = JsonUtility.FromJson<EntityList<T>>(json);

        return entities.Entities;

    }

​

    public T Find(int id)

    {

        var json = PlayerPrefs.GetString(FileName);

        var entityList = JsonUtility.FromJson<EntityList<T>>(json);

        return entityList.Entities.Find(entity => entity.ID == id);

    }

}

​

​

public class Testlevel

{

    void Test()

    {

        IRepository<Level> repository = new Repository<Level>("Levels");

        repository.Add(new Level()

        {

            Name = "Level1",

            ID = 1,

            StarCount = 0

        });

        repository.Find(23);

    }

}