Draw a random card from discard pile when the draw pile is empty while activing HISTORY

Author: cloudwu

gameplay/card.lua

@@ -204,6 +204,20 @@ function card.add_seen()
 		seen = seen + 1
 		draw_pile[seen], draw_pile[idx] = draw_pile[idx], draw_pile[seen]
 		GAME.seen = seen
+	else
+		-- draw a random card from discard pile into draw pile
+		-- See https://github.com/cloudwu/deepfuture/issues/63
+		assert(#draw_pile == seen)
+		local discard_pile = GAME.discard
+		local discard_n = #discard_pile
+		if discard_n > 0 then
+			local idx = math.random(discard_n)
+			seen = seen + 1
+			draw_pile[seen] = discard_pile[idx]
+			discard_pile[idx] = discard_pile[discard_n]
+			discard_pile[discard_n] = nil
+			GAME.seen = seen
+		end
 	end
 	return seen
 end

gameplay/effect.lua

@@ -566,7 +566,7 @@ function adv_check.infrastructure()
 end
 
 function adv_check.history()
-	return card.count "draw" - card.seen() > 0
+	return card.count "draw" + card.count "discard" - card.seen() > 0
 end
 
 function adv_check.economy()