module Mack
  module Genosaurus
    module ActiveRecord
      # Used to represent a 'column' from the param cols or columns for generators.
      class ModelColumn
      
        # The name of the column.
        attr_accessor :column_name
        # The type of the column. Ie. string, integer, datetime, etc...
        attr_accessor :column_type
        # The name of the model associated with the column. Ie. user, post, etc...
        attr_accessor :model_name
      
        # Takes in the model_name (user, post, etc...) and the column (username:string, body:text, etc...)
        def initialize(model_name, column_unsplit)
          self.model_name = model_name.singular.underscore
          cols = column_unsplit.split(":")
          self.column_name = cols.first#.underscore
          self.column_type = cols.last#.underscore
        end
      
        # Examples:
        #   Mack::Generator::ColumnObject.new("user", "username:string").form_element_name # => "user[username]"
        #   Mack::Generator::ColumnObject.new("Post", "body:text").form_element_name # => "post[body]"
        def form_element_name
          "#{self.model_name}[#{self.column_name}]"
        end

        # Examples:
        #   Mack::Generator::ColumnObject.new("user", "username:string").form_element_id # => "user_username"
        #   Mack::Generator::ColumnObject.new("Post", "body:text").form_element_id # => "post_body"
        def form_element_id
          "#{self.model_name}_#{self.column_name}"
        end

        # Generates the appropriate HTML form field for the type of column represented.
        # 
        # Examples:
        #   Mack::Generator::ColumnObject.new("user", "username:string").form_field 
        #     => "<input type="text" name="user[username]" id="user_username" size="30" value="<%= user.username %>" />"
        #   Mack::Generator::ColumnObject.new("Post", "body:text").form_field
        #     => "<textarea name="post[body]" id="post_id"><%= post.body %></textarea>"
        def form_field
          case self.column_type
          when "text"
            %{<textarea name="#{self.form_element_name}" id="#{self.form_element_id}" cols="60" rows="20"><%= @#{self.model_name}.#{self.column_name} %></textarea>}
          else
            %{<input type="text" name="#{self.form_element_name}" id="#{self.form_element_id}" size="30" value="<%= @#{self.model_name}.#{self.column_name} %>" />}
          end
        end
      
      end # ModelColumn
    end # ActiveRecord
  end # Generator
end # Mack