// MyBWRSimulator.Core/Components/Abstract/Port.cs
namespace MyBWRSimulator.Core.Components.Abstract
{
    /// <summary>
    /// Abstract base class for all types of connection points on components.
    /// </summary>
    public abstract class Port
    {
        /// <summary>
        /// Unique ID for the port (e.g., "Inlet1", "OutletA").
        /// </summary>
        public string ID { get; protected set; }

        /// <summary>
        /// A reference to the Port it's connected to. Null if not connected.
        /// </summary>
        public Port ConnectedPort { get; protected set; }

        /// <summary>
        /// A reference back to the component this port belongs to.
        /// </summary>
        public Component ParentComponent { get; internal set; } // Internal set by AddPort methods

        /// <summary>
        /// Constructor for the Port base class.
        /// </summary>
        /// <param name="id">Unique identifier for the port.</param>
        protected Port(string id)
        {
            ID = id;
        }

        /// <summary>
        /// Establishes a connection between this port and another port.
        /// </summary>
        /// <param name="otherPort">The port to connect to.</param>
        public virtual void Connect(Port otherPort)
        {
            if (otherPort == null)
            {
                Console.WriteLine($"Error: Cannot connect {ID} to null port.");
                return;
            }
            if (ConnectedPort != null && ConnectedPort != otherPort)
            {
                Console.WriteLine($"Warning: {ID} is already connected to {ConnectedPort.ID}. Disconnecting first.");
                Disconnect();
            }

            ConnectedPort = otherPort;
            // For bidirectional connection, the other port should also connect to this one
            if (otherPort.ConnectedPort != this)
            {
                otherPort.Connect(this);
            }
            Console.WriteLine($"Port {ID} connected to {otherPort.ID}.");
        }

        /// <summary>
        /// Breaks the connection of this port.
        /// </summary>
        public virtual void Disconnect()
        {
            if (ConnectedPort != null)
            {
                Port oldConnectedPort = ConnectedPort;
                ConnectedPort = null;
                // Ensure the other port also disconnects from this one
                if (oldConnectedPort.ConnectedPort == this)
                {
                    oldConnectedPort.Disconnect();
                }
                Console.WriteLine($"Port {ID} disconnected from {oldConnectedPort.ID}.");
            }
        }
    }
}