using System.Collections.Generic;
using System.Globalization;
using AibisDream.Framework;
using AibisDream.Kit;
using UnityEngine;
using System.IO;
using AibisDream.Utility;

namespace AibisDream
{
    /// <summary>
    /// 用于规定配置如何影响游戏内容
    /// </summary>
    public class SettingLoader
    {
        private readonly ConfigContainer _container;

        private SettingLoader()
        {
            // Enter Play Mode 关闭 Domain Reload 时静态状态可能保留，加载配置前先恢复默认值。
            TextSpeedSettings.Reset();
            // 初始化设置文件（如果不存在）
            InitSettingFile();
            // 读取数据
            _container = new ConfigContainer(ConstRef.SettingPath);
            LoadAllSetting();
            // 注册回调函数
            _container.OnWrite += OnSettingChanged;
        }

        private void Dispose()
        {
            _container.OnWrite -= OnSettingChanged;
        }

        private void InitSettingFile()
        {
            // 如果文件存在，则直接返回
            if (File.Exists(ConstRef.SettingPath))
            {
                return;
            }

            // 如果文件不存在，则复制默认设置（Language 为空表示跟随系统语言）
            var defaultSetting = JsonUtil.ReadJObject(ConstRef.SettingDefaultPath);
            JsonUtil.SaveJObject(defaultSetting, ConstRef.SettingPath);
        }

        private void LoadAllSetting()
        {
            var settingConfig = _container.ReadAll();
            foreach (var pair in settingConfig)
            {
                OnSettingChanged(pair.Key, pair.Value);
            }
        }

        private void OnSettingChanged(string propName, string value)
        {
            // 配置项同步
            switch (propName)
            {
                case "Volume":
                    AudioManager.Instance.SetVolume(float.Parse(value, CultureInfo.InvariantCulture));
                    break;
                case "TextSpeed":
                    TextSpeedSettings.ApplyStoredValue(value);
                    EnumEventSystem.Global.Send(
                        SettingChangeEvent.TextSpeed,
                        TextSpeedSettings.CurrentCanonicalValue);
                    break;
                case "Resolution":
                    // TODO 调整分辨率
                    break;
                case "WindowMode":
                    // 屏幕模式
#if !UNITY_ANDROID && !UNITY_IOS
                    DisplaySettingsController.Instance.ApplyWindowMode(value);
#endif
                    break;
                case "Language":
                    LocalizationKit.SwitchLanguage(LocalizationKit.ResolveLanguage(value));
                    break;
                default:
                    Debug.Log($"{propName}未正确处理");
                    break;
            }
        }

        public void Write(string propName, string value)
        {
            _container.Write(propName, value);
        }

        public bool TryRead(string key, out string value)
        {
            return _container.TryRead(key, out value);
        }

        public Dictionary<string, string> ReadAll()
        {
            return _container.ReadAll();
        }

        #region 单例部分

        public static SettingLoader Instance { get; private set; }

        public static void Init()
        {
            if (Instance != null)
            {
                Instance.Dispose();
                Instance = null;
            }
            Instance = new SettingLoader();
        }

        #endregion
    }
}