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

namespace UI
{
    public class LocalizationManager : MonoBehaviour
    {
        public static LocalizationManager Instance { get; private set; }
        
        private Dictionary<string, string> _localizedText;
        private string _currentLanguage = "en";

        public event Action OnLanguageChanged;

        private void Awake()
        {
            if (Instance == null)
            {
                Instance = this;
                if (transform.parent == null) 
                    DontDestroyOnLoad(gameObject);
                LoadLanguage(_currentLanguage);
            }
            else
            {
                Destroy(gameObject);
            }
        }

        public void LoadLanguage(string langCode)
        {
            TextAsset targetFile = Resources.Load<TextAsset>($"Localization/{langCode}");
            if (targetFile != null)
            {
                // Simple JSON parsing (For production, consider using a proper JSON library like Newtonsoft)
                string json = targetFile.text;
                _localizedText = ParseJson(json);
                _currentLanguage = langCode;
                OnLanguageChanged?.Invoke();
            }
        }

        public string Get(string key)
        {
            if (_localizedText != null && _localizedText.ContainsKey(key))
                return _localizedText[key];
            return $"[{key}]";
        }

        private Dictionary<string, string> ParseJson(string json)
        {
            // Dummy parser for demonstration, replace with JsonUtility if using wrapper class
            // or Newtonsoft for direct dictionary parsing
            var dict = new Dictionary<string, string>();
            string[] lines = json.Split(new[] { ',', '{', '}', '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries);
            foreach (var line in lines)
            {
                string[] parts = line.Split(':');
                if (parts.Length == 2)
                {
                    string key = parts[0].Trim(' ', '"');
                    string val = parts[1].Trim(' ', '"');
                    dict[key] = val;
                }
            }
            return dict;
        }
    }
}