using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Web.Script.Serialization;
using System.Threading.Tasks;


namespace AnotherReplayReader
{
    internal sealed class Cache
    {
        public static string CacheDirectory => Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "RA3Bar.Lanyi.AnotherReplayReader");
        public static string CacheFilePath => Path.Combine(CacheDirectory, "AnotherReplayReader.cache");

        private ConcurrentDictionary<string, string> _storage;

        public Cache()
        {
            try
            {
                if (!Directory.Exists(CacheDirectory))
                {
                    Directory.CreateDirectory(CacheDirectory);
                }

                var serializer = new JavaScriptSerializer();
                _storage = serializer.Deserialize<ConcurrentDictionary<string, string>>(File.ReadAllText(CacheFilePath));
            }
            catch
            {
                _storage = new ConcurrentDictionary<string, string>();
            }
        }

        public T GetOrDefault<T>(string key, in T defaultValue)
        {
            try
            {
                if (_storage.TryGetValue(key, out var valueString))
                {
                    var serializer = new JavaScriptSerializer();
                    return serializer.Deserialize<T>(valueString);
                }
            }
            catch { }
            return defaultValue;
        }

        public void Set<T>(string key, in T value)
        {
            try
            {
                var serializer = new JavaScriptSerializer();
                _storage[key] = serializer.Serialize(value);
                Save();
            }
            catch { }
        }

        public void Remove(string key)
        {
            _storage.TryRemove(key, out _);
            Save();
        }

        public void Save()
        {
            try
            {
                var serializer = new JavaScriptSerializer();
                File.WriteAllText(CacheFilePath, serializer.Serialize(_storage));
            }
            catch { }
        }
    }
}