From d50ac287e7cc00793657422dbfa36d9c71e659be Mon Sep 17 00:00:00 2001
From: David Vazgenovich Shakaryan <dvshakaryan@gmail.com>
Date: Sat, 23 Apr 2022 07:25:41 -0700
Subject: web: add undo ability; simplify prompt handlers

Undo currently works only for ongoing matches.
---
 web/dartboat_wasm.c | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

(limited to 'web/dartboat_wasm.c')

diff --git a/web/dartboat_wasm.c b/web/dartboat_wasm.c
index d52f15f..0e59312 100644
--- a/web/dartboat_wasm.c
+++ b/web/dartboat_wasm.c
@@ -82,7 +82,8 @@ EMSCRIPTEN_KEEPALIVE void draw_match() {
 	EM_ASM({drawVisit($0, $1, $2, $3, $4, $5)},
 		"0", "", "501", "", "501", "");
 
-	int n_visits = l1->n_visits > l2->n_visits ? l1->n_visits : l2->n_visits;
+	//int n_visits = l1->n_visits > l2->n_visits ? l1->n_visits : l2->n_visits;
+	int n_visits = l1->n_visits;
 	for (int i = 0; i < n_visits; ++i) {
 		sprintf(visit_no, "%d", i + 1);
 
@@ -223,7 +224,7 @@ EMSCRIPTEN_KEEPALIVE bool user_visit(int points) {
 	EM_ASM({clearVisits()});
 	draw_match();
 
-	if (!is_match_over()) {
+	if (!is_match_over() && l->n_visits > state->l2->n_visits) {
 		set_boat_active();
 		boat_visit();
 	}
@@ -236,6 +237,27 @@ EMSCRIPTEN_KEEPALIVE void user_visit_to_rem(int rem) {
 	user_visit(state->l1->rem - rem);
 }
 
+EMSCRIPTEN_KEEPALIVE bool user_undo() {
+	if (!state->l1->n_visits) {
+		EM_ASM(oi());
+		return false;
+	}
+
+	struct leg *l = state->l1;
+	struct visit *v = l->visits + --l->n_visits;
+	l->rem += v->points;
+
+	EM_ASM({updatePlayerAvg($0, $1)}, P_USER,
+		l->n_visits ? (double)(l->start-l->rem)/l->n_visits : 0);
+
+	memcpy(v, 0, sizeof(*v));
+
+	EM_ASM({clearVisits()});
+	draw_match();
+
+	return true;
+}
+
 EMSCRIPTEN_KEEPALIVE void draw_boat_throwing(int pts, char *str) {
 	char buf[10];
 	sprintf(buf, "%d", pts);
@@ -298,7 +320,7 @@ EMSCRIPTEN_KEEPALIVE void start_match() {
 	if (state) free_match();
 
 	init_boat();
-	state = calloc(1, sizeof(struct match_state));
+	state = calloc(1, sizeof(*state));
 	state->l1 = leg_init(501, "User");
 	state->l2 = leg_init(501, "Bot");
 
-- 
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