require 'facet/string/singular'
require 'facet/string/demodulize'
require 'facet/string/underscore'

require 'og/relation'
require 'og/collection'

module Og

class HasManyCollection < Collection
end

# A 'has_many' relation. There should be a respective
# 'belongs_to' relation.
#
# === Examples
#
# article.comments << Comment.new
# article.comments.size

class HasMany < Relation
=begin
	def initialize(args, options = {})
		super

		# TODO: clean this up.
		
		unless target_class.relations.find { |r| r.is_a?(BelongsTo) and	r.target_class == owner_class }
			target_class.belongs_to(owner_class)			
		end
	end
=end
	def resolve_polymorphic
		if target_class.relations
			unless target_class.relations.find { |r| r.is_a?(BelongsTo) and	r.target_class == owner_class }
				target_class.belongs_to(owner_class)			
			end
		end
	end

	def enchant
		self[:owner_singular_name] = owner_class.to_s.demodulize.underscore.downcase 
		self[:target_singular_name] = target_plural_name.to_s.singular
		self[:foreign_key] = "#{foreign_name || owner_singular_name}_#{owner_pk}"
		
		owner_class.module_eval %{ 
			attr_accessor :#{target_plural_name}

			def #{target_plural_name}(options = nil)
				unless @#{target_plural_name}
					@#{target_plural_name} = HasManyCollection.new(
						self, 
						:add_#{target_singular_name},
						:remove_#{target_singular_name},
						:find_#{target_plural_name},
						options
					)
				end

				@#{target_plural_name}.reload(options) if options and options[:reload]
				@#{target_plural_name}
			end

			def add_#{target_singular_name}(obj)
				obj.#{foreign_key} = @#{owner_pk}
				obj.save
			end

			def remove_#{target_singular_name}(obj)
				obj.#{foreign_key} = nil
			end
			
			def find_#{target_plural_name}(options = {})
				find_options = {
					:condition => "#{foreign_key} = \#\{@#{owner_pk}\}"
				}
				find_options.update(options) if options
				#{"find_options.update(:order => #{options[:order].inspect})" if options[:order]}
				#{target_class}.find(find_options)
			end
		}
	end

end

end

__END__