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

namespace NBC
{
    public class LanguageManager
    {
        private string _currentCustomLanguageName = string.Empty;
        private SystemLanguage _currentLanguage;

        private Dictionary<int, ILanguage> _lanModuleDic = new Dictionary<int, ILanguage>();

        /// <summary>
        /// 变化通知事件
        /// </summary>
        private Action _changeAction;

        public void AddLanguageModule(int type, ILanguage languageModule)
        {
            _lanModuleDic.Add(type, languageModule);
        }

        public ILanguage GetLanguageModule(int type)
        {
            return _lanModuleDic.GetValueOrDefault(type);
        }

        public string GetCurrentCustomLanguageName()
        {
            return _currentCustomLanguageName;
        }

        public SystemLanguage GetCurrentLanguage()
        {
            return _currentLanguage;
        }

        public void AutoUseLanguage()
        {
            SystemLanguage language = Application.systemLanguage;
            if (PlayerPrefs.HasKey(LanguageConst.LanguageSaveKey))
            {
                var value = PlayerPrefs.GetInt(LanguageConst.LanguageSaveKey, -1);
                if (value >= 0)
                {
                    language = (SystemLanguage)value;
                }
            }

            var list = LanguageConst.languageMap.Values.ToList();
            var findLan = list.FindIndex(t => t.Language == language);
            if (findLan < 0)
            {
                language = SystemLanguage.English;
            }

            UseLanguage(language);
        }

        public void UseLanguage(SystemLanguage language)
        {
            _currentLanguage = language;
            if (LanguageConst.languageMap.TryGetValue(language, out var info))
            {
                _currentCustomLanguageName = info.Code;
            }

            foreach (var value in _lanModuleDic.Values)
            {
                value.UseLanguage(language);
            }

            _changeAction?.Invoke();
        }

        public void AddLanguage(SystemLanguage language, bool isDefault = false)
        {
            foreach (var pair in _lanModuleDic)
            {
                pair.Value.AddLanguage(language);
            }

            if (isDefault)
            {
                UseLanguage(language);
            }
        }

        public void OnChange(Action callback)
        {
            _changeAction += callback;
        }

        public void OffChange(Action callback)
        {
            _changeAction -= callback;
        }
    }
}