class Rad::Template::Context
  include Tilt::CompileSite, Tilt::ContextExt

  # 
  # System
  #
  attr_accessor :_tilt_template
  
  def initialize instance_variables = nil
    set_instance_variables! instance_variables if instance_variables
  end    
   
  # for saving :format, :current_dir and others
  attr_accessor :scope_variables


  # 
  # Helpers
  # 
  inject(
    workspace: :workspace,
    router: :router,
    template: :template,
    logger: :logger
  )

  delegate :render, to: :template
  delegate :url_for, to: :router        


  def j obj
    obj.to_s.json_escape
  end
  
  def blank? obj
    obj.is_a?(String) ? !!(obj =~ /\A\s*\z/) : obj.blank?
  end
  def present? obj
    !blank?(obj)
  end


  # 
  # Content Variables
  # 
  attr_accessor :content_block
  def content_variables; @content_variables ||= {}.to_openobject end    
  def content_for name, content = nil, &block
    content ||= capture(&block)
    (content_variables[name.to_s] ||= "") << content
    nil
  end        
  def prepend_to name, content = nil, &block
    content ||= capture(&block)
    (content_variables[name.to_s] ||= "").insert 0, content
    nil
  end
  def wrap_content_for name, &block
    block.must_be.defined
    content = capture((content_variables[name.to_s] || ""), &block)
    content_variables[name.to_s] ||= content
    nil
  end
  def has_content_for? name
    content_variables.include? name.to_s
  end
  
  def find_relative_template *args
    self.class.find_relative_template *args
  end
  
  protected
    def set_instance_variables! instance_variables
      instance_variables = [instance_variables] unless instance_variables.is_a? Array
      instance_variables.each do |container|              
        if container.is_a? Hash
          container.each do |name, value|
            instance_variable_set("@#{name}", value)
          end
        else
          container.instance_variables.each do |ivname|
            iv = container.instance_variable_get(ivname)
            instance_variable_set(ivname, iv)
          end
        end
      end
    end
end