Catalogger.NET/Catalogger.Backend/Cache/UserCacheService.cs

using System.Collections.Concurrent;
using Remora.Discord.API.Abstractions.Objects;
using Remora.Discord.API.Abstractions.Rest;
using Remora.Rest.Core;

namespace Catalogger.Backend.Cache;

public class UserCacheService(IDiscordRestUserAPI userApi)
{
    private readonly ConcurrentDictionary<Snowflake, IUser> _cache = new();
    
    public int Size => _cache.Count;

    public async Task<IUser?> GetUserAsync(Snowflake userId)
    {
        if (_cache.TryGetValue(userId, out var user)) return user;

        var res = await userApi.GetUserAsync(userId);
        if (!res.IsSuccess) return null;

        _cache[userId] = res.Entity;
        return res.Entity;
    }

    public void UpdateUser(IUser user) => _cache[user.ID] = user;
}