using Microsoft.Extensions.Caching.Memory;

namespace SimpleAdmin.Api.Auth;

public sealed class RbacAuthCache(IMemoryCache memoryCache) : IRbacAuthCache
{
    private const string EpochKey = "rbac:auth:epoch";
    private const string UserInfoKeyPrefix = "rbac:userinfo:v3:";
    private const string AllMenusKeyPrefix = "rbac:menus:all:v3:";

    private string GetEpoch()
    {
        return memoryCache.GetOrCreate(
            EpochKey,
            entry =>
            {
                entry.Priority = CacheItemPriority.NeverRemove;
                return "0";
            })!;
    }

    public string UserInfoKey(Guid userId) => UserInfoKeyPrefix + GetEpoch() + ":" + userId;

    public string AllMenusKey() => AllMenusKeyPrefix + GetEpoch();

    public void InvalidateUser(Guid userId)
    {
        memoryCache.Remove(UserInfoKey(userId));
    }

    public void InvalidateAll()
    {
        memoryCache.Set(EpochKey, Guid.NewGuid().ToString("N"));
    }
}