class Portlet < ActiveRecord::Base

  validates_presence_of :name

  #These are here simply to temporarily hold these values
  #Makes it easy to pass them through the process of selecting a portlet type
  attr_accessor :connect_to_page_id, :connect_to_container

  attr_accessor :controller
  delegate :request, :response, :session, 
    :flash, :params, :cookies, 
    :current_user, :logged_in?,
    :to => :controller

  def self.inherited(subclass)
    super if defined? super
  ensure
    subclass.class_eval do
      
      has_dynamic_attributes
      
      acts_as_content_block(
        :versioned => false, 
        :publishable => false,
        :renderable => {:instance_variable_name_for_view => "@portlet"})
      
      def self.template_path
        default_template_path
      end      
      
      def self.helper_path
        "app/portlets/helpers/#{name.underscore}_helper.rb"
      end

      def self.helper_class
        "#{name}Helper".constantize
      end      
    end      
  end

  def self.has_edit_link?
    false
  end
  
  def self.types
    @types ||= ActiveSupport::Dependencies.load_paths.map do |d| 
      if d =~ /app\/portlets/
        Dir["#{d}/*_portlet.rb"].map do |p| 
          File.basename(p, ".rb").classify
        end
      end
    end.flatten.compact.uniq.sort
  end

  def self.get_subclass(type)
    raise "Unknown Portlet Type" unless types.map(&:name).include?(type)
    type.constantize 
  end

  # For column in list
  def portlet_type_name
    type.titleize
  end

  def self.form
    "portlets/#{name.tableize.sub('_portlets','')}/form"
  end
  
  def self.default_template
    template_file = ActionController::Base.view_paths.map do |vp| 
      path = vp.to_s.first == "/" ? vp.to_s : Rails.root.join(vp.to_s)
      Dir[File.join(path, default_template_path) + '.*']
    end.flatten.first
    template_file ? open(template_file){|f| f.read } : ""
  end
  
  def self.set_default_template_path(s)
    @default_template_path = s
  end
  
  def self.default_template_path
    @default_template_path ||= "portlets/#{name.tableize.sub('_portlets','')}/render"
  end

  def inline_options
    options = {}
    options[:inline] = self.template if self.class.render_inline 
    options[:type] = self.handler unless self.handler.blank?
    options
  end

  def self.handler(handler_type)
    define_method(:handler) { handler_type }
  end

  def self.render_inline(*args)
    if args.length > 0
      @render_inline = args.first
    elsif !defined?(@render_inline)
      @render_inline = true
    else
      @render_inline
    end
  end

  def type_name
    type.to_s.titleize
  end

  def self.columns_for_index
    [ {:label => "Name", :method => :name, :order => "name" },
      {:label => "Type", :method => :type_name, :order => "type" },
      {:label => "Updated On", :method => :updated_on_string, :order => "updated_at"} ]
  end
  
  #----- Portlet Action Related Methods ----------------------------------------
  def instance_name
    "#{self.class.name.demodulize.underscore}_#{id}"
  end
  
  def url_for_success
    [params[:success_url], self.success_url, request.referer].detect do |e|
      !e.blank?
    end    
  end

  def url_for_failure
    [params[:failure_url], self.failure_url, request.referer].detect do |e|
      !e.blank?
    end    
  end
  
  # This will copy all the params from this request into the flash.
  # The key in the flash with be the portlet instance_name and
  # the value will be the hash of all the params, except the params
  # that have values that are a StringIO or a Tempfile will be left out.
  def store_params_in_flash
    store_hash_in_flash instance_name, params
  end

  # This will convert the errors object into a hash and then store it 
  # in the flash under the key #{portlet.instance_name}_errors
  def store_errors_in_flash(errors)
    store_hash_in_flash("#{instance_name}_errors", 
      errors.inject({}){|h, (k, v)| h[k] = v; h})
  end

  def store_hash_in_flash(key, hash)
    flash[key] = hash.inject(HashWithIndifferentAccess.new) do |p,(k,v)|
      unless StringIO === v || Tempfile === v
        p[k.to_sym] = v
      end
      p
    end      
  end  
  
end