using System.Collections.Generic;
using System.Linq;

namespace Server.ContextMenus
{
    /// <summary>
    ///     Represents the state of an active context menu. This includes who opened the menu, the menu's focus object, and a list
    ///     of
    ///     <see cref="ContextMenuEntry">entries</see> that the menu is composed of.
    ///     <seealso cref="ContextMenuEntry" />
    /// </summary>
    public class ContextMenu
    {
        /// <summary>
        ///     Instantiates a new ContextMenu instance.
        /// </summary>
        /// <param name="from">
        ///     The <see cref="Mobile" /> who opened this ContextMenu.
        ///     <seealso cref="From" />
        /// </param>
        /// <param name="target">
        ///     The <see cref="Mobile" /> or <see cref="Item" /> for which this ContextMenu is on.
        ///     <seealso cref="Target" />
        /// </param>
        public ContextMenu(Mobile from, IEntity target)
        {
            From = from;
            Target = target;

            var list = new List<ContextMenuEntry>();

            if (target is Mobile mobile)
            {
                mobile.GetContextMenuEntries(@from, list);
            }
            else if (target is Item item)
            {
                item.GetContextMenuEntries(@from, list);
            }

            Entries = list.ToArray();

            for (var i = 0; i < Entries.Length; ++i)
            {
                Entries[i].Owner = this;
            }
        }

        /// <summary>
        ///     Gets the <see cref="Mobile" /> who opened this ContextMenu.
        /// </summary>
        public Mobile From { get; }

        /// <summary>
        ///     Gets an object of the <see cref="Mobile" /> or <see cref="Item" /> for which this ContextMenu is on.
        /// </summary>
        public IEntity Target { get; }

        /// <summary>
        ///     Gets the list of <see cref="ContextMenuEntry">entries</see> contained in this ContextMenu.
        /// </summary>
        public ContextMenuEntry[] Entries { get; }

        /// <summary>
        ///     Returns true if this ContextMenu requires packet version 2.
        /// </summary>
        public bool RequiresNewPacket =>
            Entries.Any(t => t.Number < 3000000 || t.Number > 3032767);
    }
}