module FacebookSocialPlugins
	class LikeButton < Button
		def initialize options = {}
			super
		end

		def plugin_class
			'fb-like'
		end

			# href - the URL to like. The XFBML version defaults to the current page.
			# send - specifies whether to include a Send button with the Like button. This only works with the XFBML version.
			# layout - there are three options.
			# 	standard - displays social text to the right of the button and friends' profile photos below. Minimum width: 225 pixels. Minimum increases by 40px if action is 'recommend' by and increases by 60px if send is 'true'. Default width: 450 pixels. Height: 35 pixels (without photos) or 80 pixels (with photos).
			# 	button_count - displays the total number of likes to the right of the button. Minimum width: 90 pixels. Default width: 90 pixels. Height: 20 pixels.
			# 	box_count - displays the total number of likes above the button. Minimum width: 55 pixels. Default width: 55 pixels. Height: 65 pixels.
			# show_faces - specifies whether to display profile photos below the button (standard layout only)
			# width - the width of the Like button.
			# action - the verb to display on the button. Options: 'like', 'recommend'
			# font - the font to display in the button. Options: 'arial', 'lucida grande', 'segoe ui', 'tahoma', 'trebuchet ms', 'verdana'
			# colorscheme - the color scheme for the like button. Options: 'light', 'dark'
			# ref - a label for tracking referrals; must be less than 50 characters and can contain alphanumeric characters and some punctuation (currently +/=-.:_). The ref attribute causes two parameters to be added to the referrer URL when a user clicks a link from a stream story about a Like action:
			# fb_ref - the ref parameter
			# fb_source - the stream type ('home', 'profile', 'search', 'ticker', 'tickerdialog' or 'other') in which the click occurred and the story type ('oneline' or 'multiline'), concatenated with an underscore.		
		def attributes
			super.merge(
				:href => :string, :send => :boolean, :layout => ['standard', 'button_count', 'box_count'],
				:show_faces => :boolean, :action => ['like', 'recommend'], :ref => :string,
				:fb_ref => :string, :fb_source => :special, :width => :integer
			)
		end

		def validate_fb_source value
			raise ArgumentError, "The fb_source option must have a [stream type]_[story line] format, was #{value}" unless value =~ /\S+_\S+/

			stream_type, story_line = value.split('_')
			raise ArgumentError, "Not a valid stream type, must be one of #{stream_types}, was #{stream_type}" unless stream_types.include?(stream_type)
			raise ArgumentError, "Not a valid story line, must be one of #{story_lines}, was #{story_line}" unless story_lines.include?(story_line)
		end

		private

		def stream_types 
			['home', 'profile', 'search', 'ticker', 'tickerdialog', 'other']
		end
		
		def story_lines 
			['oneline', 'multiline']
		end
	end
end