require_relative 'base_formatter'

module AmazingPrint
  module Formatters
    class StructFormatter < BaseFormatter
      attr_reader :struct, :variables, :inspector, :options

      def initialize(struct, inspector)
        @struct = struct
        @variables = struct.members
        @inspector = inspector
        @options = inspector.options
      end

      def format
        vars = variables.map do |var|
          property = var.to_s[1..-1].to_sym # to_s because of some monkey patching done by Puppet.
          accessor = if struct.respond_to?(:"#{property}=")
                       struct.respond_to?(property) ? :accessor : :writer
                     else
                       struct.respond_to?(property) ? :reader : nil
                     end
          if accessor
            ["attr_#{accessor} :#{property}", var]
          else
            [var.to_s, var]
          end
        end

        data = vars.sort.map do |declaration, var|
          key = left_aligned do
            align(declaration, declaration.size)
          end

          unless options[:plain]
            if key =~ /(@\w+)/
              key.sub!(Regexp.last_match(1), colorize(Regexp.last_match(1), :variable))
            else
              key.sub!(/(attr_\w+)\s(\:\w+)/, "#{colorize('\\1', :keyword)} #{colorize('\\2', :method)}")
            end
          end

          indented do
            key << colorize(' = ', :hash) + inspector.awesome(struct.send(var))
          end
        end

        if options[:multiline]
          "#<#{awesome_instance}\n#{data.join(%(,\n))}\n#{outdent}>"
        else
          "#<#{awesome_instance} #{data.join(', ')}>"
        end
      end

      private

      def awesome_instance
        # We need to ensure that the original Kernel#format is used here instead of the one defined
        # above.
        # rubocop:disable Style/ColonMethodCall
        Kernel::format("#{struct.class.superclass}:#{struct.class}:0x%08x", (struct.__id__ * 2))
        # rubocop:enable Style/ColonMethodCall
      end

      def left_aligned
        current = options[:indent]
        options[:indent] = 0
        yield
      ensure
        options[:indent] = current
      end
    end
  end
end
