using System;
using System.Collections.Generic;

namespace ZB.MOM.WW.CBDDC.Core.Network;

/// <summary>
///     Represents a peer node in a distributed network, including its unique identifier, network address, and last seen
///     timestamp.
/// </summary>
public class PeerNode
{
    /// <summary>
    ///     Initializes a new instance of the PeerNode class with the specified node identifier, network address, and last
    ///     seen timestamp.
    /// </summary>
    /// <param name="nodeId">The unique identifier for the peer node. Cannot be null or empty.</param>
    /// <param name="address">The network address of the peer node. Cannot be null or empty.</param>
    /// <param name="lastSeen">The date and time when the peer node was last seen, expressed as a DateTimeOffset.</param>
    /// <param name="type">The type of the peer node. Defaults to LanDiscovered.</param>
    /// <param name="role">The role of the peer node. Defaults to Member.</param>
    /// <param name="configuration">The peer node configuration</param>
    /// <param name="interestingCollections">The list of collections this peer is interested in.</param>
    public PeerNode(
        string nodeId,
        string address,
        DateTimeOffset lastSeen,
        PeerType type = PeerType.LanDiscovered,
        NodeRole role = NodeRole.Member,
        PeerNodeConfiguration? configuration = null,
        IEnumerable<string>? interestingCollections = null)
    {
        NodeId = nodeId;
        Address = address;
        LastSeen = lastSeen;
        Type = type;
        Role = role;
        Configuration = configuration;
        InterestingCollections = new List<string>(interestingCollections ?? []).AsReadOnly();
    }

    /// <summary>
    ///     Gets the unique identifier for the node.
    /// </summary>
    public string NodeId { get; }

    /// <summary>
    ///     Gets the address associated with the current instance.
    /// </summary>
    public string Address { get; }

    /// <summary>
    ///     Gets the date and time when the entity was last observed or updated.
    /// </summary>
    public DateTimeOffset LastSeen { get; }

    /// <summary>
    ///     Gets the configuration settings for the peer node.
    /// </summary>
    public PeerNodeConfiguration? Configuration { get; }

    /// <summary>
    ///     Gets the type of the peer node (LanDiscovered, StaticRemote, or CloudRemote).
    /// </summary>
    public PeerType Type { get; }

    /// <summary>
    ///     Gets the role assigned to this node within the cluster.
    /// </summary>
    public NodeRole Role { get; }

    /// <summary>
    ///     Gets the list of collections this peer is interested in.
    /// </summary>
    public IReadOnlyList<string> InterestingCollections { get; }
}