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/*
* The Mana World Server
* Copyright 2007 The Mana World Development Team
*
* This file is part of The Mana World.
*
* The Mana World 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 2 of the License, or
* any later version.
*
* The Mana World is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with The Mana World; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <algorithm>
#include <cassert>
#include "game-server/trade.hpp"
#include "defines.h"
#include "game-server/character.hpp"
#include "game-server/gamehandler.hpp"
#include "game-server/inventory.hpp"
#include "net/messageout.hpp"
Trade::Trade(Character *c1, Character *c2):
mChar1(c1), mChar2(c2), mMoney1(0), mMoney2(0), mState(TRADE_INIT)
{
MessageOut msg(GPMSG_TRADE_REQUEST);
msg.writeShort(c1->getPublicID());
c2->getClient()->send(msg);
c1->setTrading(this);
c2->setTrading(this);
}
Trade::~Trade()
{
mChar1->setTrading(NULL);
mChar2->setTrading(NULL);
}
void Trade::cancel(Character *c)
{
MessageOut msg(GPMSG_TRADE_CANCEL);
if (c != mChar1) mChar1->getClient()->send(msg);
if (c != mChar2) mChar2->getClient()->send(msg);
delete this;
}
bool Trade::request(Character *c, int id)
{
if (mState != TRADE_INIT || c != mChar2 || mChar1->getPublicID() != id)
{
/* This is not an ack for the current transaction. So assume
a new one is about to start and cancel the current one. */
cancel(c);
return false;
}
// Starts trading.
mState = TRADE_RUN;
MessageOut msg(GPMSG_TRADE_START);
mChar1->getClient()->send(msg);
mChar2->getClient()->send(msg);
return true;
}
bool Trade::perform(TradedItems items, Inventory &inv1, Inventory &inv2)
{
for (TradedItems::const_iterator i = items.begin(),
i_end = items.end(); i != i_end; ++i)
{
if (i->id != inv1.getItem(i->slot) ||
inv1.removeFromSlot(i->slot, i->amount) != 0 ||
inv2.insert(i->id, i->amount) != 0)
{
return false;
}
}
return true;
}
void Trade::accept(Character *c)
{
if (mState == TRADE_RUN)
{
if (c == mChar2)
{
std::swap(mChar1, mChar2);
std::swap(mItems1, mItems2);
std::swap(mMoney1, mMoney2);
}
assert(c == mChar1);
// First player agrees.
mState = TRADE_EXIT;
MessageOut msg(GPMSG_TRADE_ACCEPT);
mChar2->getClient()->send(msg);
return;
}
if (mState != TRADE_EXIT || c != mChar2)
{
// First player has already agreed. We only care about the second one.
return;
}
Inventory v1(mChar1, true), v2(mChar2, true);
if (!perform(mItems1, v1, v2) ||
!perform(mItems2, v2, v1) ||
!v1.changeMoney(mMoney2 - mMoney1) ||
!v2.changeMoney(mMoney1 - mMoney2))
{
v1.cancel();
v2.cancel();
cancel(NULL);
return;
}
MessageOut msg(GPMSG_TRADE_COMPLETE);
mChar1->getClient()->send(msg);
mChar2->getClient()->send(msg);
delete this;
}
void Trade::setMoney(Character *c, int amount)
{
if (mState == TRADE_INIT || amount < 0) return;
/* Checking now if there is enough money is useless as it can change
later on. At worst, the transaction will be canceled at the end if
the client lied. */
MessageOut msg(GPMSG_TRADE_SET_MONEY);
msg.writeLong(amount);
if (c == mChar1)
{
mMoney1 = amount;
mChar2->getClient()->send(msg);
}
else
{
assert(c == mChar2);
mMoney2 = amount;
mChar1->getClient()->send(msg);
}
// Go back to normal run.
mState = TRADE_RUN;
}
void Trade::addItem(Character *c, int slot, int amount)
{
if (mState == TRADE_INIT) return;
Character *other;
TradedItems *items;
if (c == mChar1)
{
other = mChar2;
items = &mItems1;
}
else
{
assert(c == mChar2);
other = mChar1;
items = &mItems2;
}
// Arbitrary limit to prevent a client from DOSing the server.
if (items->size() >= 50) return;
Inventory inv(c);
int id = inv.getItem(slot);
if (id == 0) return;
/* Checking now if there is enough items is useless as it can change
later on. At worst, the transaction will be canceled at the end if
the client lied. */
TradedItem ti = { id, slot, amount };
items->push_back(ti);
MessageOut msg(GPMSG_TRADE_ADD_ITEM);
msg.writeShort(id);
msg.writeByte(amount);
other->getClient()->send(msg);
// Go back to normal run.
mState = TRADE_RUN;
}
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