require 'check_exception'

class Check
  @name = nil
  attr_accessor :name

  @uri = nil
  attr_accessor :uri

  @timeout = nil # seconds
  attr_accessor :timeout

  @max_age = nil # seconds
  attr_accessor :max_age

  @reqeust = nil
  @passed = nil
  @error = nil
  attr_reader :error

  def initialize(params = {})
    self.name = params[:name]
    self.uri = params[:uri]
    self.timeout = params[:timeout] || 5
    self.max_age = params[:max_age] || 30
  end

  def type
    raise "Override me!"
  end

  def perform_check
    raise "Override me!"
  end

  def do_it(force = false)
    return unless force || stale?
    @request = Time.now
    begin
      Timeout.timeout(timeout) do
        perform_check
        @passed = true
      end
    rescue Exception => err
      STDERR.puts "#{err.class}: #{err.message}\n#{err.backtrace.join("\n")}"
      @error = "#{err.class}: #{err.message}"
      @passed = false
    end
  end

  def stale?
    @request ||= Time.at(0)
    @request < Time.now - max_age
  end

  def passed?
    @passed
  end
end