From 8df1c18e7594de3fede403361b83cfc0437f366c Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ccxvii.net>
Date: Sun, 24 Sep 2023 23:49:16 +0200
Subject: Disallow passing if reinforcements can still enter.

---
 rules.js | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

(limited to 'rules.js')

diff --git a/rules.js b/rules.js
index 54ee60a..e8c98c7 100644
--- a/rules.js
+++ b/rules.js
@@ -1215,6 +1215,8 @@ function end_movement() {
 
 states.movement = {
 	prompt() {
+		let may_pass = 1
+
 		prompt("Movement.")
 
 		update_zoc()
@@ -1263,8 +1265,12 @@ states.movement = {
 				for (let p of info.list) {
 					if (piece_hex(p) === REINFORCEMENTS) {
 						has_reinf = true
-						gen_action_piece(p)
-						break
+						if (can_piece_enter(p)) {
+							if (game.remain > 0)
+								may_pass = 0
+							gen_action_piece(p)
+							break
+						}
 					}
 				}
 			}
@@ -1279,7 +1285,7 @@ states.movement = {
 					gen_action_piece(p)
 		}
 
-		view.actions.pass = 1
+		view.actions.pass = may_pass
 	},
 	piece(p) {
 		push_undo()
@@ -1521,6 +1527,19 @@ function search_detachment_road_segment(queue, here, road, cur, dir) {
 		queue.push(here)
 }
 
+function can_piece_enter(p) {
+	let xs = find_reinforcement_hex(p)
+	if (typeof xs === "number") {
+		if (!hex_has_any_piece(xs, all_corps))
+			return true
+	} else {
+		for (let x of xs)
+			if (!hex_has_any_piece(x, all_corps))
+				return true
+	}
+	return false
+}
+
 function search_move(p) {
 	move_seen.fill(0)
 	move_flip.fill(1)
-- 
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