module WorldFlags
	module ViewHelper
		def self.flag_sizes
			[16, 32, 64]
		end

		# define more mappings by setting WorldFlags.locale_flag_map to a Hash map
		# http://en.wikipedia.org/wiki/ISO_639-1_language_matrix
		def flag_code code
			WorldFlags.flag_code code
		end

		def flags_list size = 16, &block
			raise "Missing block" unless block_given?
			raise "Supported sizes are only #{WorldFlags::ViewHelper.flag_sizes}" unless WorldFlags::ViewHelper.flag_sizes.include?(size.to_i)
			content = capture(&block)
			content_tag :ul, content, :class => "f#{size}"
		end
		alias_method :flag_list, :flags_list

		# http://en.wikipedia.org/wiki/ISO_639-1_language_matrix

		# should look up translation for each code
		def flags flags_arr, options = {}
			flags_arr.inject("") do |res, elem|
				case elem
				when Array
					code = elem.first
					name = elem.last
				when String, Symbol
					code = elem
					name = WorldFlags.label(code, options)
				else
					raise ArgumentError, "Bad argument: #{flags_arr}, must be Hash or Array"
				end				
				res << flag(code, name, options)
			end.html_safe
		end

		def flags_title flags_arr, options = {}
			flags flags_arr, options.merge(:title => true)
		end

		def flag code, name, options = {}
			label = options[:content] ? name : '&nbsp;'
			extra_options = options[:title] ? {:title => name } : {}			
			selected = flag_selected?(code, options) ? 'selected' : ''
			content_tag :li,  label.html_safe, {:class => "flag #{code} #{selected}", :'data-country' => name, :'data-cc' => code}.merge(options[:html] || {}).merge(extra_options)
		end

		def flag_selected? code, options = {}
			selected = options[:selected] || options[code.to_sym]
			selected ||= (flag_code(I18n.locale.to_sym) == code.to_sym) if WorldFlags.auto_select?
		end

		def flag_title code, name, options = {}
			flag code, name, options.merge(:title => true)
		end

		def use_flags size = 16
			stylesheet_link_tag "flags/flags#{size}"
		end
	end
end