Language Manager

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class LanguageManager : MonoBehaviour
{
    public delegate void LanguageHandler(LanguageItem newLanguage);
    public static event LanguageHandler OnLanguageChanged;

    public static LanguageItem currentLanguage { get; private set; }

    private static LanguageManager instance = null;

    public SystemLanguage defaultLanguage = SystemLanguage.English;
    public Font defaultFont;
    public List<LanguageItem> listItems;

    public static LanguageManager GetInstance()
    {
        if (instance == null)
        {
            instance = FindObjectOfType<LanguageManager>();
        }
        return instance;
    }

    public LanguageItem GetLanguageBySysName(SystemLanguage sysName)
    {
        //1. search selected language
        for (int i = 0; i < listItems.Count; i++)
            if (listItems[i].menuProfile.sysLanguage == sysName)
                return listItems[i];

        //2. no available profile - use default
        for (int i = 0; i < listItems.Count; i++)
            if (listItems[i].menuProfile.sysLanguage == defaultLanguage)
                return listItems[i];

        return null;
    }

    public void SetLanguage(SystemLanguage sysName)
    {
        currentLanguage = GetLanguageBySysName(sysName);

        OnLanguageChanged?.Invoke(currentLanguage);
    }

    private void OnDestroy()
    {
        if (instance == this)
            instance = null;
    }
}

[System.Serializable]
public class LanguageItem
{
    public LanguageProfileMenu menuProfile;
    //additional profiles
    //public LanguageProfileForge forgeProfile;
    //public LanguageProfileGame gameProfile;
    //public LanguageProfileTips tipsProfile;
}