1 files changed, 16 insertions, 0 deletions
diff --git a/src/game/unit_repl.cpp b/src/game/unit_repl.cpp
index 6dfa005..ddea8b0 100644
--- a/src/game/unit_repl.cpp
+++ b/src/game/unit_repl.cpp
@@ -54,10 +54,26 @@ void unit_repl_t::render_to(render::state_t *render)
 
 void unit_repl_t::activate(unit_t::type_t type)
 {
+	size_t price;
 	world::cmodel_t cmodel;
 	unit_t *unit;
 
 	switch (type) {
+	case UNIT_SOLDIER:   price = 40; break;
+	case UNIT_SCIENTIST: price = 95; break;
+	case UNIT_BUILDER:   price = 70; break;
+	default:
+		abort();
+	}
+
+	if (game->crystals < price) {
+		game->interface.print("Insufficient crystals; " + std::to_string(price - game->crystals) + " more needed.");
+		return;
+	}
+
+	game->crystals -= price;
+
+	switch (type) {
 	case UNIT_SOLDIER:
 		unit = new unit_soldier_t(game);
 		break;