EveCalc/EveCalc.Shared/Logic/NameCache.cs

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EveCalc.Shared.Logic
{
    public partial class EsiClientWrapper
    {
        private static string nameCacheFileName = "namecache.json";
        private Dictionary<long, string> nameCache = new Dictionary<long, string>();

        public void LoadNameCache()
        {
            if (File.Exists(nameCacheFileName))
            {
                var json = File.ReadAllText(nameCacheFileName);
                this.nameCache = JsonConvert.DeserializeObject<Dictionary<long, string>>(json);
            }
        }

        public void AddToNameCache(long id, string name)
        {
            if (this.nameCache.ContainsKey(id))
            {
                if (this.nameCache[id] != name)
                {
                    this.nameCache[id] = name;
                    this.SaveCache();
                }
            }
            else
            {
                this.nameCache.Add(id, name);
                this.SaveCache();
            }
        }

        public async Task<string> GetFromNameCache(long id)
        {
            if (this.nameCache.ContainsKey(id))
            {
                return this.nameCache[id];
            }

            // Get from api
            var response2 = await client.Universe.Names(new List<long> { id });
            if (response2.Data != null && response2.Data.Count > 0)
            {
                var name = response2.Data[0].Name;
                this.AddToNameCache(id, name);
                return name;
            }

            return null;
        }

        private void SaveCache()
        {
            var json = JsonConvert.SerializeObject(this.nameCache);
            File.WriteAllText(nameCacheFileName, json);
        }
    }
}