From ef6dc279b0aa0fc8a69d41458021e4fdbc6ec853 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ccxvii.net>
Date: Sun, 21 Jul 2024 16:46:01 +0200
Subject: exchange before playing cards

---
 rules.js | 37 +++++++++++++++++++++++++++++++++----
 1 file changed, 33 insertions(+), 4 deletions(-)

diff --git a/rules.js b/rules.js
index fd69ba7..75c538f 100644
--- a/rules.js
+++ b/rules.js
@@ -306,9 +306,12 @@ function discard_card(c, reason) {
 
 function can_exchange_for_discard(c) {
 	if (game.did_discard_event) {
-		if (game.active === P_BRITAIN)
-			return true
-		return CARDS[c].count > 1
+		let card = CARDS[c]
+		if (card.type === "ops") {
+			if (game.active === P_BRITAIN)
+				return CARDS[c].count > 0
+			return CARDS[c].count > 1
+		}
 	}
 	return false
 }
@@ -1268,8 +1271,11 @@ states.strategy_phase = {
 	inactive: "to play a strategy card",
 	prompt() {
 		view.prompt = "Play a strategy card."
-		for (let c of active_hand())
+		for (let c of active_hand()) {
 			gen_action_card("card", c)
+			if (can_exchange_for_discard(c))
+				view.actions.exchange = 1
+		}
 	},
 	card(c) {
 		push_undo()
@@ -1284,6 +1290,29 @@ states.strategy_phase = {
 				break
 		}
 	},
+	exchange() {
+		push_undo()
+		let d = game.did_discard_event
+		set_add(active_hand(), d)
+		logp("picked up up #" + d)
+		game.state = "exchange"
+	},
+}
+
+states.exchange = {
+	inactive: "to play a strategy card",
+	prompt() {
+		view.prompt = "Exchange an OPS card for the event card."
+		view.selected_card = game.did_discard_event
+		for (let c of active_hand())
+			if (can_exchange_for_discard(c))
+				gen_action_card("card", c)
+	},
+	card(c) {
+		game.did_discard_event = 0
+		discard_card(c, "exchange")
+		game.state = "strategy_phase"
+	},
 }
 
 states.strategy_phase_ops = {
-- 
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