using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core;
using Tango.Core.Commands;

namespace Tango.PPC.Common.Notifications
{
    /// <summary>
    /// Represents a base notification item class.
    /// </summary>
    /// <seealso cref="Tango.Core.ExtendedObject" />
    /// <seealso cref="System.IDisposable" />
    public abstract class ItemBase : ExtendedObject, IDisposable
    {
        /// <summary>
        /// Occurs when the item has been closed.
        /// </summary>
        public event EventHandler Closed;

        /// <summary>
        /// Occurs when the item has been pressed.
        /// </summary>
        public event EventHandler Pressed;

        /// <summary>
        /// Gets or sets the remove action.
        /// </summary>
        internal Action RemoveAction { get; set; }

        /// <summary>
        /// Gets or sets the view type.
        /// </summary>
        public abstract Type ViewType { get; }

        /// <summary>
        /// Gets or sets the close command.
        /// </summary>
        public RelayCommand CloseCommand { get; set; }

        /// <summary>
        /// Gets or sets the pressed command.
        /// </summary
        public RelayCommand PressedCommand { get; set; }

        /// <summary>
        /// Initializes a new instance of the <see cref="ItemBase"/> class.
        /// </summary>
        public ItemBase()
        {
            CloseCommand = new RelayCommand(Close);
            PressedCommand = new RelayCommand(OnPreesed);
        }

        /// <summary>
        /// Called when the item has been pressed.
        /// </summary>
        protected virtual void OnPreesed()
        {
            Pressed?.Invoke(this, new EventArgs());
        }

        /// <summary>
        /// Called after the close command has been raised.
        /// </summary>
        public virtual void Close()
        {
            RemoveAction?.Invoke();
            Closed?.Invoke(this, new EventArgs());
        }

        /// <summary>
        /// Disposes the item.
        /// </summary>
        public void Dispose()
        {
            Close();
        }
    }
}