Fix some "may" events to make momentum changes optional.

1 files changed, 52 insertions, 4 deletions

diff --git a/rules.js b/rules.js
index de5f33e..a96cbf3 100644
--- a/rules.js
+++ b/rules.js
@@ -2758,6 +2758,20 @@ function vm_decrease_prussian_collaboration() {
 		vm_next()
 }
 
+function vm_may_decrease_revolutionary_momentum() {
+	if (game.red_momentum > 0)
+		game.state = "vm_may_decrease_revolutionary_momentum"
+	else
+		vm_next()
+}
+
+function vm_may_decrease_prussian_collaboration() {
+	if (game.blue_momentum > 0)
+		game.state = "vm_may_decrease_prussian_collaboration"
+	else
+		vm_next()
+}
+
 function vm_operand_spaces(x) {
 	let s = vm_operand(x)
 	if (typeof s === "number")
@@ -2995,6 +3009,40 @@ states.vm_decrease_prussian_collaboration = {
 	},
 }
 
+states.vm_may_decrease_revolutionary_momentum = {
+	inactive: "decrease Revolutionary Momentum",
+	prompt() {
+		event_prompt("Decrease Revolutionary Momentum.")
+		view.actions.red_momentum = 1
+		view.actions.pass = 1
+	},
+	red_momentum() {
+		push_undo()
+		decrease_revolutionary_momentum()
+	},
+	pass() {
+		push_undo()
+		vm_next()
+	},
+}
+
+states.vm_may_decrease_prussian_collaboration = {
+	inactive: "decrease Prussian Collaboration",
+	prompt() {
+		event_prompt("Decrease Prussian Collaboration.")
+		view.actions.blue_momentum = 1
+		view.actions.pass = 1
+	},
+	blue_momentum() {
+		push_undo()
+		decrease_prussian_collaboration()
+	},
+	pass() {
+		push_undo()
+		vm_next()
+	},
+}
+
 function can_vm_place() {
 	for (let s of game.vm.spaces)
 		if (can_place_cube(s, game.vm.removed))
@@ -4292,9 +4340,9 @@ CODE[39] = [ // Léon Gambetta
 	[ vm_prompt, "Replace up to 1 in Institutional." ],
 	[ vm_replace_up_to, 1, INSTITUTIONAL ],
 	[ vm_if, ()=>(game.active === COMMUNE) ],
-	[ vm_decrease_prussian_collaboration ],
+	[ vm_may_decrease_prussian_collaboration ],
 	[ vm_else ],
-	[ vm_decrease_revolutionary_momentum ],
+	[ vm_may_decrease_revolutionary_momentum ],
 	[ vm_endif ],
 	[ vm_return ],
 ]
@@ -4458,9 +4506,9 @@ CODE[52] = [ // Rise of Republicanism
 CODE[53] = [ // Legitimacy
 	[ vm_ops, 3, POLITICAL ],
 	[ vm_if, ()=>(game.active === COMMUNE) ],
-	[ vm_increase_revolutionary_momentum ],
+	[ vm_may_increase_revolutionary_momentum ],
 	[ vm_else ],
-	[ vm_increase_prussian_collaboration ],
+	[ vm_may_increase_prussian_collaboration ],
 	[ vm_endif ],
 	[ vm_return ],
 ]