// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Runtime.CompilerServices;
 
namespace Microsoft.AspNetCore.SignalR.StackExchangeRedis.Internal;
 
internal sealed class RedisChannels
{
    private readonly string _prefix;
 
    /// <summary>
    /// Gets the name of the channel for sending to all connections.
    /// </summary>
    /// <remarks>
    /// The payload on this channel is <see cref="RedisInvocation"/> objects containing
    /// invocations to be sent to all connections
    /// </remarks>
    public string All { get; }
 
    /// <summary>
    /// Gets the name of the internal channel for group management messages.
    /// </summary>
    public string GroupManagement { get; }
 
    /// <summary>
    /// Gets the name of the internal channel for receiving client results.
    /// </summary>
    public string ReturnResults { get; }
 
    public RedisChannels(string prefix, string serverName)
    {
        _prefix = prefix;
 
        All = prefix + ":all";
        GroupManagement = prefix + ":internal:groups";
        ReturnResults = _prefix + ":internal:return:" + serverName;
    }
 
    /// <summary>
    /// Gets the name of the channel for sending a message to a specific connection.
    /// </summary>
    /// <param name="connectionId">The ID of the connection to get the channel for.</param>
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public string Connection(string connectionId)
    {
        return _prefix + ":connection:" + connectionId;
    }
 
    /// <summary>
    /// Gets the name of the channel for sending a message to a named group of connections.
    /// </summary>
    /// <param name="groupName">The name of the group to get the channel for.</param>
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public string Group(string groupName)
    {
        return _prefix + ":group:" + groupName;
    }
 
    /// <summary>
    /// Gets the name of the channel for sending a message to all collections associated with a user.
    /// </summary>
    /// <param name="userId">The ID of the user to get the channel for.</param>
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public string User(string userId)
    {
        return _prefix + ":user:" + userId;
    }
 
    /// <summary>
    /// Gets the name of the acknowledgement channel for the specified server.
    /// </summary>
    /// <param name="serverName">The name of the server to get the acknowledgement channel for.</param>
    /// <returns></returns>
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public string Ack(string serverName)
    {
        return _prefix + ":internal:ack:" + serverName;
    }
}