/*
 *  Empire - A multi-player, client/server Internet based war game.
 *  Copyright (C) 1986-2021, Dave Pare, Jeff Bailey, Thomas Ruschak,
 *                Ken Stevens, Steve McClure, Markus Armbruster
 *
 *  Empire 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.
 *
 *  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, see <http://www.gnu.org/licenses/>.
 *
 *  ---
 *
 *  See files README, COPYING and CREDITS in the root of the source
 *  tree for related information and legal notices.  It is expected
 *  that future projects/authors will amend these files as needed.
 *
 *  ---
 *
 *  offe.c: Offer a loan
 *
 *  Known contributors to this file:
 *     Pat Loney, 1992
 *     Steve McClure, 1996
 *     Markus Armbruster, 2005-2016
 */

#include <config.h>

#include "commands.h"
#include "loan.h"
#include "optlist.h"

static int do_loan(void);

int
c_offer(void)
{
    char *cp;

    cp = player->argp[1] ? player->argp[1] : "loan";
    switch (*cp) {
    case 'l':
	if (!opt_LOANS) {
	    pr("Loans are not enabled.\n");
	    return RET_FAIL;
	}
	return do_loan();
    default:
	pr("You must specify \"loan\".\n");
	return RET_SYN;
    }
}

static int
do_loan(void)
{
    int amt, irate, dur, maxloan;
    struct nstr_item nstr;
    struct natstr *natp;
    struct lonstr loan;
    natid recipient;
    int n;
    char prompt[128];

    if ((n = natarg(player->argp[2], "Lend to? ")) < 0)
	return RET_SYN;
    recipient = n;
    if (recipient == player->cnum) {
	pr("You can't loan yourself money!\n");
	return RET_FAIL;
    }
    if (!nat_accepts(recipient, player->cnum, REJ_LOAN)) {
	pr("%s is rejecting your loans.\n", cname(recipient));
	return RET_SYN;
    }
    natp = getnatp(player->cnum);
    if (natp->nat_money + 100 > MAXLOAN)
	maxloan = MAXLOAN;
    else
	maxloan = natp->nat_money - 100;
    if (maxloan < 0) {
	pr("You don't have enough money to loan!\n");
	return RET_FAIL;
    }
    sprintf(prompt, "Size of loan for country #%d? (max %d) ",
	    recipient, maxloan);
    amt = onearg(player->argp[3], prompt);
    if (amt <= 0)
	return RET_FAIL;
    if (amt > MAXLOAN) {
	pr("You can only loan $%d at a time.\n", MAXLOAN);
	return RET_FAIL;
    }
    if (amt > maxloan) {
	pr("You can't afford that much.\n");
	return RET_FAIL;
    }
    dur = onearg(player->argp[4], "Duration? (days, max 7) ");
    if (dur <= 0)
	return RET_FAIL;
    if (dur > 7)
	return RET_FAIL;
    irate = onearg(player->argp[5], "Interest rate? (from 5 to 25%) ");
    if (irate > 25)
	return RET_FAIL;
    if (irate < 5)
	return RET_FAIL;
    snxtitem_all(&nstr, EF_LOAN);
    while (nxtitem(&nstr, &loan)) {
	if ((loan.l_status == LS_SIGNED) && (loan.l_lonee == player->cnum)
	    && (loan.l_loner == recipient)) {
	    pr("You already owe HIM money - how about repaying your loan?\n");
	    return RET_FAIL;
	}
    }
    snxtitem_all(&nstr, EF_LOAN);
    while (nxtitem(&nstr, &loan)) {
	if (loan.l_status == LS_FREE)
	    break;
    }
    ef_blank(EF_LOAN, nstr.cur, &loan);
    loan.l_loner = player->cnum;
    loan.l_lonee = recipient;
    loan.l_status = LS_PROPOSED;
    loan.l_irate = MIN(irate, 127);
    loan.l_ldur = MIN(dur, 127);
    loan.l_amtpaid = 0;
    loan.l_amtdue = amt;
    (void)time(&loan.l_lastpay);
    loan.l_duedate = loan.l_ldur * SECS_PER_DAY + loan.l_lastpay;
    if (!putloan(nstr.cur, &loan)) {
	logerror("do_loan: can't save loan");
	pr("Couldn't save loan; get help!\n");
	return RET_FAIL;
    }
    pr("You have offered loan %d\n", nstr.cur);
    wu(0, recipient, "Country #%d has offered you a loan (#%d)\n",
       player->cnum, nstr.cur);
    return RET_OK;
}