# open application_file
# see if there is the config.[statement] = [expr]

module RSpec::Rails::ContentMatchers
  class HaveAppConfig

    use_rails_file_helpers :special # TODO !!!
    
    attr_reader :left_side, :right_side, :operator

    def initialize statement_hash
      @left_side, @right_side = *statement.first
      @operator = statement.last[:op] || '='
    end

    # TODO: relative to root_path ?
    def matches?(root_path=nil)      
      content = read_application_file
      return nil if content.empty?
      
      ls, rs, op = escape_all(left_side, right_side, operator)
      (content =~ /config.#{ls}\s*#{op}\s*#{rs}/)
    end

    def escape_all *texts
      texts.map{|t| Regexp.escape(t) }
    end

    def msg
      "there to be the Application config statement '#{left_side} #{operator} #{right_side}' in config/application.rb"
    end
  
    def failure_message
      "Expected #{msg}" 
    end 
    
    def negative_failure_message
      super
      "Did not expect #{msg}" 
    end
  end
                    
  # config.autoload_paths += %W(#{Rails.root}/lib)
  # have_app_config :autoload_paths => '%W(#{Rails.root}/lib)', :op => '+='
  def have_app_config statement_hash
    HaveAppConfig.new statement_hash
  end
  
end