using JetBrains.Annotations;
using System;
using System.Collections.Generic;

namespace BEG.Localization
{
    public class LocalizationManager
    {
        public event Action OnLanguageChanged; 

        public string CurrentLanguage
        {
            get => currentLanguage?.Name ?? "";
            set
            {
                currentLanguage = languages[value];
                OnLanguageChanged?.Invoke();
            }
        }

        public readonly LocalizationContext GlobalContext = new ();
        
        private readonly Dictionary<string, Language> languages = new ();
        private Language currentLanguage;

        [PublicAPI]
        public void AddLanguage(Language language) => languages.Add(language.Name, language);

        [PublicAPI]
        public ITranslation GetTranslation(string key) =>
            currentLanguage.GetTranslation(key);

        [PublicAPI] public Action Translate(string key, Action<string> action, params LocalizationContext[] contexts)
        {
            void Update()
            {
                if (currentLanguage == null) return;
                
                var translation = currentLanguage.GetTranslation(key);
                translation.Get(action, currentLanguage, contexts);
            }
            
            Update();
            OnLanguageChanged += Update;

            return () => OnLanguageChanged -= Update;
        }
    }
}