1 files changed, 62 insertions, 0 deletions
diff --git a/lib/colonial_twilight/actions/fln/subvert.rb b/lib/colonial_twilight/actions/fln/subvert.rb
new file mode 100644
index 0000000..a6ec252
--- /dev/null
+++ b/lib/colonial_twilight/actions/fln/subvert.rb
@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+
+require_relative 'fln_action'
+
+module ColonialTwilight
+  module Actions
+    module FLN
+      # Subvert 4.3.2
+      class Subvert < FlnAction
+        def initialize(space, mode)
+          super(space, mode, cost: 0)
+          @second = nil
+        end
+
+        def validate!
+          super
+          return if @second.nil?
+
+          p = (mode[:remove_police] || 0) + (@second.mode[:remove_police] || 0)
+          t = (mode[:remove_troops] || 0) + (@second.mode[:remove_troops] || 0)
+          raise "remove #{p} police + #{t} troops > 2" if p + t > 2
+        end
+
+        def subvert!(space2, mode2)
+          raise 'subvert! called twice' unless @second.nil?
+          raise 'cannot subvert! after replace algerian police' if mode.key?(:replace_police)
+          raise 'cannot subvert! with replace algerian police' if mode2.key?(:replace_police)
+
+          @second = Subvert.new(space2, mode2)
+          validate!
+        end
+
+        # remove 2 Algerian cubes into Available, among selected spaces
+        # or remove 1 Algerian Police and replace it with 1 Underground Guerrilla from Available.
+        def apply!(board)
+          raise NotImplementedError
+        end
+
+        class << self
+          def special?
+            true
+          end
+
+          # spaces with Underground Guerrillas and Algerian cubes.
+          def applicable?(space)
+            space.fln_underground.positive? && space.algerian_cubes.positive?
+          end
+
+          def available_modes(space)
+            modes = {}
+            if space.algerian_police.positive?
+              modes[:replace_police] = 1
+              modes[:remove_police] = space.algerian_police > 1 ? 2 : 1
+            end
+            modes[:remove_troops] = space.algerian_troops > 1 ? 2 : 1 if space.algerian_troops.positive?
+            modes
+          end
+        end
+      end
+    end
+  end
+end