# TODO ChangePage has to have a working dup method.

class ChangePage
	def mcGet_eventBits(index)
		event_bits = 0
		# important: only change event bit if corresponding event flag is set
		# TODO receive answer from Holger what the comment above means
		(index*32).upto(index*32+31) do |i|
			event_bits |= (1 << ((i) % 32)) if @has_event[i]
		end
		event_bits
	end
	def mcSet_eventBits(value, index)
		# important: only change event flag if corresponding event bit is set
		(index*32).upto(index*32+31) do |i|
			@has_event[i] = true if value & (1 << ((i) % 32))
		end
	end
	
	def resetEventFlags
		@has_event = Array.new(NUM_CHANGE_EVENTS, false)
	end
	
	#
	# This emulates an array of target contents. See also comment at
	# Element#mcGet_content() for detailed explanation.
	#
	def mcGet_targetContent(index)
		return @targetContent if index
		return [@targetContent]
	end
	def mcSet_targetContent(val,index)
		@targetContent = val if index
		@targetContent = val[0] if index
	end
	
	def initialize
		mcSetToDefaults($ruleset_CUSX_change)
	
		resetEventFlags
	
		@direct_action = 0
		@other_action = 0
	end
	
	attr_bool :can_change                   # use or ignore this change info

	# TODO :has_event is bool[NUM_CHANGE_EVENTS]
	attr_accessor :has_event                # change events

	attr_accessor :trigger_player           # player triggering change
	attr_accessor :trigger_side             # side triggering change
	attr_accessor :trigger_page             # page triggering change

	attr_accessor :target_element           # target element after change

	attr_accessor :delay_fixed              # added frame delay before changed (fixed)
	attr_accessor :delay_random             # added frame delay before changed (random)
	attr_accessor :delay_frames             # either 1 (frames) or 50 (seconds 50 fps)

	attr_accessor :trigger_element          # element triggering change

	# TODO :target_content is struct Content
	attr_accessor :target_content           # elements for extended change target
	attr_bool :use_target_content           # use extended change target
	attr_bool :only_if_complete             # only use complete target content
	attr_bool :use_random_replace           # use random value for replacing elements
	attr_accessor :random_percentage        # random value for replacing elements
	attr_accessor :replace_when             # type of elements that can be replaced

	attr_bool :explode                      # explode instead of change

	attr_bool :has_action                   # execute action on specified condition
	attr_accessor :action_type              # type of action
	attr_accessor :action_mode              # mode of action
	attr_accessor :action_arg               # parameter of action

	# ---------- internal values used in level editor ----------

	attr_accessor :direct_action            # change triggered by actions on element
	attr_accessor :other_action             # change triggered by other element actions
end