using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;

namespace Rssdp.Infrastructure
{
	/// <summary>
	/// Correclty implements the <see cref="IDisposable"/> interface and pattern for an object containing only managed resources, and adds a few common niceities not on the interface such as an <see cref="IsDisposed"/> property.
	/// </summary>
	public abstract class DisposableManagedObjectBase : IDisposable
	{

		#region Public Methods

		/// <summary>
		/// Override this method and dispose any objects you own the lifetime of if disposing is true;
		/// </summary>
		/// <param name="disposing">True if managed objects should be disposed, if false, only unmanaged resources should be released.</param>
		protected abstract void Dispose(bool disposing);

		/// <summary>
		/// Throws and <see cref="System.ObjectDisposedException"/> if the <see cref="IsDisposed"/> property is true.
		/// </summary>
		/// <seealso cref="IsDisposed"/>
		/// <exception cref="System.ObjectDisposedException">Thrown if the <see cref="IsDisposed"/> property is true.</exception>
		/// <seealso cref="Dispose()"/>
		protected virtual void ThrowIfDisposed()
		{
			if (this.IsDisposed) throw new ObjectDisposedException(this.GetType().FullName);
		}

		#endregion

		#region Public Properties

		/// <summary>
		/// Sets or returns a boolean indicating whether or not this instance has been disposed.
		/// </summary>
		/// <seealso cref="Dispose()"/>
		public bool IsDisposed
		{
			get;
			private set;
		}

        #endregion

        public string BuildMessage(string header, Dictionary<string, string> values)
        {
            var builder = new StringBuilder();

            const string argFormat = "{0}: {1}\r\n";

            builder.AppendFormat("{0}\r\n", header);

            foreach (var pair in values)
            {
                builder.AppendFormat(argFormat, pair.Key, pair.Value);
            }

            builder.Append("\r\n");

            return builder.ToString();
        }
        
        #region IDisposable Members

        /// <summary>
        /// Disposes this object instance and all internally managed resources.
        /// </summary>
        /// <remarks>
        /// <para>Sets the <see cref="IsDisposed"/> property to true. Does not explicitly throw an exception if called multiple times, but makes no promises about behaviour of derived classes.</para>
        /// </remarks>
        /// <seealso cref="IsDisposed"/>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1063:ImplementIDisposableCorrectly", Justification="We do exactly as asked, but CA doesn't seem to like us also setting the IsDisposed property. Too bad, it's a good idea and shouldn't cause an exception or anything likely to interfer with the dispose process.")]
		public void Dispose()
		{
            IsDisposed = true;

            Dispose(true);
        }

        #endregion
    }
}