ModernUO/Projects/UOContent/Mobiles/AI/BaseAI/TransferItem.cs

/*************************************************************************
 * ModernUO                                                              *
 * Copyright 2019-2025 - ModernUO Development Team                       *
 * Email: hi@modernuo.com                                                *
 * File: TransferItem.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.Runtime.CompilerServices;
using ModernUO.Serialization;

namespace Server.Mobiles;

[SerializationGenerator(0, false)]
internal sealed partial class TransferItem : Item
{
    private readonly BaseCreature _creature;

    public override string DefaultName => _creature.GetType().Name;

    public TransferItem(BaseCreature creature) : base(ShrinkTable.Lookup(creature))
    {
        _creature = creature;
        Movable = false;

        Hue = creature.Hue & 0x0FFF;
    }

    public override bool SkipSerialization => true;

    public static bool IsInCombat(BaseCreature creature) => creature?.Aggressors.Count > 0 || creature?.Aggressed.Count > 0;

    public override void GetProperties(IPropertyList list)
    {
        base.GetProperties(list);
        list.Add(1041603);                  // This item represents a pet currently in consideration for trade
        list.Add(1041601, _creature.Name); // Pet Name: ~1_val~

        if (_creature.ControlMaster != null)
        {
            list.Add(1041602, _creature.ControlMaster.Name); // Owner: ~1_val~
        }
    }

    public override bool AllowSecureTrade(Mobile from, Mobile to, Mobile newOwner, bool accepted)
    {
        if (!base.AllowSecureTrade(from, to, newOwner, accepted) || IsInvalidTrade(from, to))
        {
            return false;
        }

        return !accepted || HandleAcceptedTrade(from, to);
    }

    private bool IsInvalidTrade(Mobile from, Mobile to) =>
        Deleted
        || _creature?.Deleted != false
        || _creature.ControlMaster != from
        || !from.CheckAlive()
        || !to.CheckAlive()
        || from.Map != _creature.Map
        || !from.InRange(_creature, 14);

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    private bool HandleAcceptedTrade(Mobile from, Mobile to) =>
        ValidateYoungStatus(from, to) && ValidateControlStatus(from, to) && ValidateFollowerLimit(to) &&
        !IsInCombat(_creature);

    private bool ValidateFollowerLimit(Mobile to)
    {
        if (to.Followers + _creature.ControlSlots > to.FollowersMax)
        {
            to.SendLocalizedMessage(1049607);
            // You have too many followers to control that creature.
            return false;
        }

        return true;
    }

    private static bool ValidateYoungStatus(Mobile from, Mobile to)
    {
        var youngFrom = from is PlayerMobile mobile && mobile.Young;
        var youngTo = to is PlayerMobile playerMobile && playerMobile.Young;

        if (youngFrom && !youngTo)
        {
            from.SendLocalizedMessage(502051);
            // As a young player, you may not transfer pets to older players.
            return false;
        }

        if (!youngFrom && youngTo)
        {
            from.SendLocalizedMessage(502052);
            // As an older player, you may not transfer pets to young players.
            return false;
        }

        return true;
    }

    private bool ValidateControlStatus(Mobile from, Mobile to)
    {
        if (!_creature.CanBeControlledBy(to))
        {
            SendTransferRefusalMessages(from, to, 1043248, 1043249);
            // The pet refuses to be transferred because it will not obey ~1_NAME~.~3_BLANK~
            // The pet will not accept you as a master because it does not trust you.~3_BLANK~
            return false;
        }

        if (!_creature.CanBeControlledBy(from))
        {
            SendTransferRefusalMessages(from, to, 1043250, 1043251);
            // The pet refuses to be transferred because it will not obey you sufficiently.~3_BLANK~
            // The pet will not accept you as a master because it does not trust ~2_NAME~.~3_BLANK~
            return false;
        }

        return true;
    }

    private static void SendTransferRefusalMessages(Mobile from, Mobile to, int fromMessage, int toMessage)
    {
        var args = $"{to.Name}\t{from.Name}\t ";
        from.SendLocalizedMessage(fromMessage, args);
        to.SendLocalizedMessage(toMessage, args);
    }

    public override void OnSecureTrade(Mobile from, Mobile to, Mobile newOwner, bool accepted)
    {
        if (Deleted || IsInvalidTrade(from, to))
        {
            Delete();
            return;
        }

        Delete();

        if (!accepted || !_creature.SetControlMaster(to))
        {
            return;
        }

        TransferPetOwnership(from, to);
    }

    private void TransferPetOwnership(Mobile from, Mobile to)
    {
        if (_creature.Summoned)
        {
            _creature.SummonMaster = to;
        }

        _creature.ControlTarget = to;
        _creature.ControlOrder = OrderType.Follow;
        _creature.BondingBegin = DateTime.MinValue;
        _creature.OwnerAbandonTime = DateTime.MinValue;
        _creature.IsBonded = false;
        _creature.PlaySound(_creature.GetIdleSound());

        var args = $"{from.Name}\t{_creature.Name}\t{to.Name}";
        from.SendLocalizedMessage(1043253, args);
        // You have transferred your pet to ~3_GETTER~.
        to.SendLocalizedMessage(1043252, args);
        // ~1_NAME~ has transferred the allegiance of ~2_PET_NAME~ to you.
    }
}