// Author: Gockner, Simon
// Created: 2020-03-06
// Copyright(c) 2020 SimonG. All Rights Reserved.

using System;

namespace GBase.Api
{
    /// <summary>
    /// Notify the GBase that an entry has changed
    /// </summary>
    public abstract class NotifyGBaseEntryChanged : INotifyGBaseEntryChanged //TODO: Rename to GBaseValueChanged or EntryUpdated?
    {
        /// <summary>
        /// Notify the GBase that an entry has changed
        /// </summary>
        public event EventHandler<GBaseEntryChangedEventArgs> GBaseEntryChanged;

        /// <summary>
        /// Raise the <see cref="GBaseEntryChanged"/> event
        /// </summary>
        /// <param name="entry">The entry (sender)</param>
        /// <param name="columnName">The name of the IGBaseColumn</param>
        /// <param name="value">The new value</param>
        protected void RaiseGBaseEntryChanged(object entry, string columnName, object value)
        {
            GBaseEntryChanged?.BeginInvoke(entry, new GBaseEntryChangedEventArgs(columnName, value), GBaseEntryChangedCallback, null);
        }

        /// <summary>
        /// Raise the GBaseEntry removed (<see cref="GBaseEntryChanged"/> event without args)
        /// </summary>
        /// <param name="entry">The entry (sender)</param>
        protected void RaiseGBaseEntryRemoved(object entry)
        {
            GBaseEntryChanged?.BeginInvoke(entry, null, GBaseEntryChangedCallback, null);
        }

        /// <summary>
        /// Callback for the <see cref="GBaseEntryChanged"/> event
        /// </summary>
        /// <param name="asyncResult">The <see cref="IAsyncResult"/></param>
        private void GBaseEntryChangedCallback(IAsyncResult asyncResult)
        {
            GBaseEntryChanged?.EndInvoke(asyncResult); //TestMe: Does this work? Or is there something to be done with the asyncResult
        }
    }
}