require 'table_helper/cell'

module PluginAWeek #:nodoc:
  module TableHelper
    # Represents a single row within a table.  A row can consist of either
    # data cells or header cells.
    class Row < HtmlElement
      def initialize #:nodoc:
        super
        
        @cells = ActiveSupport::OrderedHash.new
      end
      
      # Creates a new cell with the given name and generates shortcut
      # accessors for the method.
      def cell(name, *args)
        name = name.to_s if name
        
        cell = Cell.new(name, *args)
        @cells[name] = cell
        
        define_cell_accessor(name) if name && !respond_to?(name)
        
        cell
      end
      
      # The names of all cells in this row
      def cell_names
        @cells.keys
      end
      
      # Clears all of the current cells from the row
      def clear
        cell_names.each do |name|
          klass = class << self; self; end
          klass.class_eval do
            remove_method(name)
          end
        end
        
        @cells.clear
      end
      
      private
        # Defines the accessor method for the given cell name.  For example, if
        # a cell with the name :title was defined, then the cell would be able
        # to be read and written like so:
        # 
        #   row.title               #=> Accesses the title
        #   row.title "Page Title"  #=> Creates a new cell with "Page Title" as the content
        def define_cell_accessor(name)
          instance_eval <<-end_eval
            def #{name.gsub('-', '_')}(*args)
              if args.empty?
                @cells[#{name.inspect}]
              else
                cell(#{name.inspect}, *args)
              end
            end
          end_eval
        end
        
        def tag_name
          'tr'
        end
        
        def content
          @cells.values.map(&:html).join
        end
    end
  end
end