using System;
using JD.Interfaces.Remoting;
using JD.Remoting.Details;

namespace JD.Remoting
{
    /// <summary>
    /// The Message is the logical communication element, user can send a message by creating a new one or by simply using the "Send" method.
    /// </summary>
    public class Message : IMessage
    {
        /// <summary>
        /// Gets the content of the message at the current read/write position.
        /// </summary>
        public IBlob Content { get; private set; }

        /// <summary>
        /// The command 
        /// </summary>
        public string CommandName
        {
            get { return Header.CommandName; }
        }

        /// <summary>
        /// The parsed header from the engine message
        /// </summary>
        internal MessageHeader Header { get; set; }

        /// <summary>
        /// Builds a message either to read from or to write into.
        /// </summary>
        /// <remarks>When the plugin name is not specified, it is automatically filled with the appropriate value.</remarks>
        public Message(string commandName, IBlob content = null)
        {
            if (string.IsNullOrEmpty(commandName))
                throw new ArgumentException("CommandName cannot be left empty");

            Content = content ?? new Blob(allowRead: true);
            Header = new MessageHeader { CommandName = commandName };
        }
    }
}