From 68b60cb8d7601ddafd322184a79cd3e4d11688dd Mon Sep 17 00:00:00 2001
From: kcwu <kcwu@63ad8ddf-47c3-0310-b6dd-a9e9d9715204>
Date: Thu, 7 Oct 2004 18:12:55 +0000
Subject: calculate chess ELO rating only show rating in debug mode now

git-svn-id: http://opensvn.csie.org/pttbbs/trunk/pttbbs@2228 63ad8ddf-47c3-0310-b6dd-a9e9d9715204
---
 mbbsd/Makefile |  1 +
 mbbsd/chc.c    | 33 +++++++++++++++++++++++++++++++++
 mbbsd/talk.c   |  5 +++++
 3 files changed, 39 insertions(+)

(limited to 'mbbsd')

diff --git a/mbbsd/Makefile b/mbbsd/Makefile
index 124ae821..e2177d43 100644
--- a/mbbsd/Makefile
+++ b/mbbsd/Makefile
@@ -20,6 +20,7 @@ OBJS=	admin.o announce.o args.o assess.o bbs.o board.o cache.o cal.o card.o\
 CFLAGS+= -DMERGEBBS
 OBJS+= merge.o
 .endif
+LDFLAGS+= -lm
 
 .SUFFIXES: .c .o
 .c.o:	../include/var.h
diff --git a/mbbsd/chc.c b/mbbsd/chc.c
index 7d36ce9d..06623a5f 100644
--- a/mbbsd/chc.c
+++ b/mbbsd/chc.c
@@ -1,4 +1,5 @@
 /* $Id$ */
+#include <math.h>
 #include "bbs.h"
 
 #define CENTER(a, b)	(((a) + (b)) >> 1)
@@ -563,6 +564,7 @@ chcusr_put(userec_t *userec, chcusr_t *user)
     userec->chc_win = user->win;
     userec->chc_lose = user->lose;
     userec->chc_tie = user->tie;
+    userec->chess_elo_rating = user->rating;
 }
 
 static void
@@ -572,6 +574,9 @@ chcusr_get(userec_t *userec, chcusr_t *user)
     user->win = userec->chc_win;
     user->lose = userec->chc_lose;
     user->tie = userec->chc_tie;
+    user->rating = userec->chess_elo_rating;
+    if(user->rating == 0)
+	user->rating = 1500; /* ELO initial value */
 }
 
 static int
@@ -754,6 +759,30 @@ myplay(int s, chcusr_t *user1, chcusr_t *user2, board_t board, board_t tmpbrd)
     return endgame;
 }
 
+/*
+ * ELO rating system
+ * see http://www.wordiq.com/definition/ELO_rating_system
+ */
+static void
+count_chess_elo_rating(chcusr_t *user1, chcusr_t *user2, double myres)
+{
+    double k;
+    double exp_res;
+    if(user1->rating < 1800)
+	k = 30;
+    else if(user1->rating < 2000)
+	k = 25;
+    else if(user1->rating < 2200)
+	k = 20;
+    else if(user1->rating < 2400)
+	k = 15;
+    else
+	k = 10;
+
+    exp_res = 1.0/(1.0 + pow(10.0, (user2->rating-user1->rating)/400.0));
+    user1->rating += (int)floor(k*(myres-exp_res)+0.5);
+}
+
 static void
 mainloop(int s, chcusr_t *user1, chcusr_t *user2, board_t board, play_func_t play_func[2])
 {
@@ -776,16 +805,20 @@ mainloop(int s, chcusr_t *user1, chcusr_t *user2, board_t board, play_func_t pla
     }
 
     if (chc_mode & CHC_VERSUS) {
+	/* XXX 不正常斷線目前不會更改 ELO rating */
 	if (endgame == 1) {
 	    strlcpy(chc_warnmsg, "對方認輸了!", sizeof(chc_warnmsg));
+	    count_chess_elo_rating(user1, user2, 1.0);
 	    user1->win++;
 	    currutmp->chc_win++;
 	} else if (endgame == 2) {
 	    strlcpy(chc_warnmsg, "你認輸了!", sizeof(chc_warnmsg));
+	    count_chess_elo_rating(user1, user2, 0.0);
 	    user1->lose++;
 	    currutmp->chc_lose++;
 	} else {
 	    strlcpy(chc_warnmsg, "和棋", sizeof(chc_warnmsg));
+	    count_chess_elo_rating(user1, user2, 0.5);
 	    user1->tie++;
 	    currutmp->chc_tie++;
 	}
diff --git a/mbbsd/talk.c b/mbbsd/talk.c
index 66613e99..a85e3d75 100644
--- a/mbbsd/talk.c
+++ b/mbbsd/talk.c
@@ -1634,9 +1634,14 @@ descript(int show_mode, userinfo_t * uentp, time_t diff)
 		 uentp->five_lose, uentp->five_tie);
 	return description;
     case 3:
+#ifdef DEBUG
+	snprintf(description, sizeof(description),
+		 "%d", uentp->chess_elo_rating);
+#else
 	snprintf(description, sizeof(description),
 		 "%3d/%3d/%3d", uentp->chc_win,
 		 uentp->chc_lose, uentp->chc_tie);
+#endif
 	return description;
     default:
 	syslog(LOG_WARNING, "damn!!! what's wrong?? show_mode = %d",
-- 
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