Config.cs

using Newtonsoft.Json;
using System;
using System.IO;
using System.Reflection;
using UnityEngine;

namespace oni_vietnamese.Config {
    public class FontConfig {
        public string Filename { get; set; }
        public string Code { get; set; }
        public bool LeftToRight { get; set; }
        public float Scale { get; set; }

        public FontConfig(string filename, string code, bool leftToRight, float scale) {
            this.Filename = filename;
            this.Code = code;
            this.LeftToRight = leftToRight;
            this.Scale = scale;
        }
    }

    public class ConfigManager {
        private readonly string ns = MethodBase.GetCurrentMethod().DeclaringType.Namespace;
        private static readonly object _lock = new object();
        private static ConfigManager instance;
        public string configPath { get; set; }

        public static ConfigManager Instance {
            get {
                lock (_lock) {
                    if (instance == null) {
                        instance = new ConfigManager();
                    }
                    return instance;
                }
            }
        }

        public FontConfig LoadConfigFile() {
            FontConfig fc;
            try {
                using (var r = new StreamReader(Path.Combine(configPath, "config.json"))) {
                    var json = r.ReadToEnd();
                    fc = JsonConvert.DeserializeObject<FontConfig>(json);
                }
            } catch (Exception e) {
                Debug.Log($"[{ns}] Load config failure...Excption: {e.Message}");
                Debug.Log($"[{ns}] Use default config.");
                fc = new FontConfig("font", "zh", true, 1);
            }
            return fc;
        }
    }
}