/*
 *  Empire - A multi-player, client/server Internet based war game.
 *  Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
 *                           Ken Stevens, Steve McClure
 *
 *  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 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  ---
 *
 *  See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
 *  related information and legal notices. It is expected that any future
 *  projects/authors will amend these files as needed.
 *
 *  ---
 *
 *  shark.c: Transfer a loan by buying it out
 * 
 *  Known contributors to this file:
 *     Pat Loney, 1992
 *     Steve McClure, 1996-2000
 */

#include <math.h>
#include "misc.h"
#include "var.h"
#include "file.h"
#include "sect.h"
#include "item.h"
#include "loan.h"
#include "news.h"
#include "nat.h"
#include "xy.h"
#include "player.h"
#include "commands.h"
#include "optlist.h"

int
shark(void)
{
	register int arg;
	time_t	now;
	char	*p;
	struct	lonstr loan;
	struct natstr *natp;
	struct natstr *oldie;
	long	due;
	long	last;
	long	rdur;
	long	xdur;
	double	rate;
	double	owed;
	long payment;
	s_char buf[1024];

	if (!opt_LOANS) {
	    pr("Loans are not enabled.\n");
	    return RET_FAIL;
	}
	p = getstarg(player->argp[1], "Transfer which loan #: ", buf);
	if (p == 0)
		return RET_SYN;
	if (*p == 0)
		return RET_SYN;
	arg = atoi(p);
	if (arg < 0)
		return RET_SYN;
	/* Check if it's a valid loan to shark.  That means, is it a valid loan,
	   not owed to this player, with a valid duration and it's been signed. */
	if (!getloan(arg,&loan) || (loan.l_loner == player->cnum) || 
		(loan.l_ldur == 0) || (loan.l_status != LS_SIGNED)) {
		pr("Invalid loan\n");
		return RET_FAIL;
	}
	/* If we got here, we check to see if it's been defaulted on. */
	(void) time(&now);
	due = loan.l_duedate;
	if (now <= due) {
		pr("There has been no default on loan %d\n", arg);
		return RET_FAIL;
	}
	last = loan.l_lastpay;
	if (last < due && due < now) {
		rdur = due - last;
		xdur = now - due;
	} else if (due < last) {
		rdur = 0;
		xdur = now - last;
	}
	rate = loan.l_irate / (loan.l_ldur * 8.64e6);

	owed = ((rdur * rate) + (xdur * rate * 2.0) + 1.0);
	if (((1 << 30) / owed) < loan.l_amtdue)
		owed = (1 << 30);
	else
		owed *= loan.l_amtdue;
	pr("That loan is worth $%.2f.\n", owed);
	natp = getnatp(player->cnum);
	payment = owed * (1.0 + loan.l_irate / 100.0);
	if (payment > natp->nat_money - 100.0){
		pr("You do not have enough to cover that loan\n");
		return RET_FAIL;
	}else{
		wu(0, loan.l_lonee,
			"%s bought loan #%d.  You now owe him!\n",
				cname(player->cnum),
				arg);
		wu(0, loan.l_loner,
			"%s bought loan #%d out from under you for %d\n",
			cname(player->cnum), arg, payment);
		pr("You now own loan #%d.  Go break some legs.\n", arg);
	}
/*	NAT_DELTA(natp->nat_money, loan.l_loner, payment);*/
	oldie = getnatp(loan.l_loner);
	oldie->nat_money += payment;
	player->dolcost += payment;
	loan.l_loner = player->cnum;
	putloan(arg, &loan);
	return RET_OK;
}