module ActiveScaffold::Actions
  module Show
    def self.included(base)
      base.before_filter :show_authorized_filter, :only => :show
      base.helper_method :show_columns
    end

    def show
      # rest destroy falls back to rest show in case of disabled javascript
      # just render action_confirmation message for destroy
      unless params.delete :destroy_action
        do_show
        successful?
        respond_to_action(:show)
      else
        @record = find_if_allowed(params[:id], :read) if params[:id] && params[:id] && params[:id].to_i > 0
        action_confirmation_respond_to_html(:destroy)
      end
    end

    protected
    
    def show_respond_to_json
      render :text => response_object.to_json(:only => show_columns_names), :content_type => Mime::JSON, :status => response_status
    end

    def show_respond_to_yaml
      render :text => Hash.from_xml(response_object.to_xml(:only => show_columns_names)).to_yaml, :content_type => Mime::YAML, :status => response_status
    end

    def show_respond_to_xml
      render :xml => response_object.to_xml(:only => show_columns_names), :content_type => Mime::XML, :status => response_status
    end

    def show_respond_to_js
      render :partial => 'show'
    end

    def show_respond_to_html
      render :action => 'show'
    end
    # A simple method to retrieve and prepare a record for showing.
    # May be overridden to customize show routine
    def do_show
      @record = find_if_allowed(params[:id], :read)
    end

    # The default security delegates to ActiveRecordPermissions.
    # You may override the method to customize.
    def show_authorized?(record = nil)
      authorized_for?(:crud_type => :read)
    end

    def show_formats
      (default_formats + active_scaffold_config.formats + active_scaffold_config.show.formats).uniq
    end

    def show_columns
      active_scaffold_config.show.columns
    end

    def show_columns_names
      show_columns.collect(&:name)
    end
    
    private 
    def show_authorized_filter
      link = active_scaffold_config.show.link || active_scaffold_config.show.class.link
      raise ActiveScaffold::ActionNotAllowed unless self.send(link.security_method)
    end
    
  end
end