require 'erb'

module Luruju
  
  class JudeMeta
    
    def initialize() @interfaces = HashWithIndifferentAccess.new end

    @@instance = new
    def self.instance() @@instance end
    def self.instance=(instance) @@instance = instance end
    
    attr_accessor :interfaces
    
    def jude_class(jude_if_name) JudeApi.module_eval "Jude#{jude_if_name}" end

    def create_jude_if jude_if_name
      jude_if = JudeInterface.new
      jude_if.if_name = jude_if_name
      @interfaces[jude_if_name] = jude_if
      jude_if
    end
    
    def self.is_defined_for_luruju? jude_if
      JudeApi.const_defined? "Jude#{jude_if.if_name rescue jude_if}Methods"
    end
    
    def define_all() @interfaces.each_value{|i| i.define_for_luruju unless JudeMeta.is_defined_for_luruju?(i)} end
    
    class JudeInterface

      attr_accessor :if_name, :attributes, :super_if_names, :constants
      
      def initialize() @attributes, @super_if_names, @constants = [], [], {} end
      def super_ifs() @super_if_names.collect{|x|JudeMeta.instance.interfaces[x]} end
      def module_name() "Jude#{if_name}Methods" end
      def class_name() "Jude#{if_name}" end
            
      def define_for_luruju
        super_ifs.select{|x|!JudeMeta.is_defined_for_luruju?(x.if_name)}.each{|x|x.define_for_luruju}
        JudeApi.module_eval ERB.new(module_erb_def).result(binding)
        JudeApi.module_eval ERB.new(class_erb_def).result(binding)
        JudeApi.module_eval class_name
      end

      protected
      def module_erb_def
        return <<-EOD
module <%= module_name %>
<% super_ifs.each do |super_if| %>
  include <%= super_if.module_name %>
<% end %>
<% attributes.each do |attr| %>
  attr_accessor :<%= attr %>
  <%  if /^is_/ =~  attr %>
  alias_method :<%= attr %>?, :<%= attr %>
  <% end %>
<% end %>
<% constants.each do |key,value| %>
   <%= key %> = <%= value %>
<% end %>
end
        EOD
      end
      
      def class_erb_def
        return <<-EOD
class <%= class_name %>  < JudeBase
  include <%= module_name %>
end
        EOD
      end
    end
  end
end