/*************************************************************************
 * ModernUO                                                              *
 * Copyright 2019-2020 - ModernUO Development Team                       *
 * Email: hi@modernuo.com                                                *
 * File: OutgoingTargetPackets.cs                                        *
 *                                                                       *
 * This program is free software: you can redistribute it and/or modify  *
 * it under the terms of the GNU General Public License as published by  *
 * the Free Software Foundation, either version 3 of the License, or     *
 * (at your option) any later version.                                   *
 *                                                                       *
 * You should have received a copy of the GNU General Public License     *
 * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 *************************************************************************/

using System;
using System.Buffers;
using Server.Targeting;

namespace Server.Network
{
    public static class OutgoingTargetPackets
    {
        public static void SendMultiTargetReq(this NetState ns, MultiTarget t)
        {
            if (ns == null || !ns.GetSendBuffer(out var buffer))
            {
                return;
            }

            var writer = new CircularBufferWriter(buffer);
            writer.Write((byte)0x99); // Packet ID
            writer.Write(t.AllowGround);
            writer.Write(t.TargetID);
            writer.Write((byte)t.Flags);
            writer.Clear(11);
            writer.Write((short)t.MultiID);
            writer.Write((short)t.Offset.X);
            writer.Write((short)t.Offset.Y);
            writer.Write((short)t.Offset.Z);
            if (ns.HighSeas)
            {
                writer.Write(0);
            }

            ns.Send(ref buffer, writer.Position);
        }

        public static void SendCancelTarget(this NetState ns)
        {
            if (ns == null)
            {
                return;
            }

            Span<byte> span = stackalloc byte[]
            {
                0x6C, // Packet ID
                0, // Allow Ground?
                0, 0, 0, 0, // Target ID
                3, // Flags
                0, 0, 0, 0, 0,
                0, 0, 0, 0, 0,
                0, 0
            };

            ns.Send(span);
        }

        public static void SendTargetReq(this NetState ns, Target t)
        {
            if (ns == null || !ns.GetSendBuffer(out var buffer))
            {
                return;
            }

            var writer = new CircularBufferWriter(buffer);
            writer.Write((byte)0x6C); // Packet ID
            writer.Write(t.AllowGround);
            writer.Write(t.TargetID);
            writer.Write((byte)t.Flags);
            writer.Clear(12);

            ns.Send(ref buffer, writer.Position);
        }
    }
}