module Ropenlayer
  module ActsAs
      
    # acts_as_localizable_on: give to the model facilities to store and draw object in a map.
    #
    #   class Team < ActiveRecord::Base
    #     acts_as_map :default_layer => :google_streets, :nodes => [ :offices ]
    #   end
    #
    #   class Office < ActiveRecord::Base
    #     belongs_to :team
    #     acts_as_localizable_on :team
    #   end
    #
    # Avalaible options:
    #
    #  All the options can be mapped to a Proc object that will bind self or a Symbol which perform send(:symbol) method.
    #  - :name, :Name of the point. By default, Just another Element
    #  - :popup_content:Content of the popup, if set, element will render a popup in click with this xhtml content. by default, is false 
    #  - :icon_url: Icon url to show, by default, /images/ropenlayer/default_marker.png
    #  - :color: Background color, by default transparent
    #
    # Examples
    #
    # Build a Map of the team offices with custom icons
    #
    #   # on app/models/team.rb
    #   class Team < ActiveRecord::Base
    #     has_many :offices
    #     acts_as_map :default_layer => :google_streets, :latitude => 40000.23, :longitude => 54555.233, :zoom => 3
    #                 :nodes => [ :offices ]
    #   end
    #
    #   # on app/models/office.rb
    #   class Office < ActiveRecord::Base
    #     belongs_to :team
    #     acts_as_localizable_on :team, :icon_url      => Proc.new{|o| o.main ? '/images/main_office.png' : '/images/office.png' },
    #                                   :color         => Proc.new{|o| o.main ? 'red' : 'blue' },
    #                                   :popup_content => :full_description
    #
    #     def full_description
    #       %( #{ name } - #{ address } )
    #     end
    #  end
    #
    #
    # on your view, just
    #  
    #   apps/views/offices/index.html
    # 
    #   <div id="offices_for_team_map" style="width: 500px; height: 400px;"></div>
    #   <%= raw @team.ropenlayer_map(:id => 'offices_for_team_map').to_js %>
    module Nodeable
      
      class << self
        def included(base)
          
          base.class_eval do 
            
            has_one :node,      :as => :nodeable, :dependent => :destroy, :include => :localizations, :class_name => "Ropenlayer::Node"
            accepts_nested_attributes_for :node
        
            base.send :include, InstanceMethods
            
          end
       end
        
       module InstanceMethods

          def node_data
            attributes_config = self.class.ropenlayer_node_config[:attributes] || {}
            #[ :name, :popup_content, :icon_url, :color ].each do |attribute|
            node_map_attributes = Ropenlayer::Openlayer::Feature.all_attributes.inject({}) do |hash, attribute|

              hash[attribute] = eval_node_attribute(attributes_config[attribute]) unless attributes_config[attribute].nil?
              hash
            end
            
            if self.node.localizations.any?
              node_map_attributes[:id]            = self.node.id
              node_map_attributes[:geometry]      = self.node.geometry
              node_map_attributes[:longitude]     = self.node.localizations.first.longitude
              node_map_attributes[:latitude]      = self.node.localizations.first.latitude
              node_map_attributes[:localizations] = self.node.localizations.map{|l| { :latitude => l.latitude, :longitude => l.longitude }}
            else
              node_map_attributes = nil
            end
            node_map_attributes
          end

          def ensure_nodeable_model
            raise "Model `#{ self.class }` doesnt acts as nodeable" unless self.class.methods.include?("acts_as_nodeable") and self.class.acts_as_nodeable
          end
          
          private
          def eval_node_attribute(attribute)
            case attribute
            when Symbol
              return self.send(attribute)
            when Proc
              return attribute.call(self)
            else
              return attribute
            end
          end
        end
      end
    end
  end
end