require 'digest/sha1'

module APIClient

  class Configuration

    # serverio ip/adresas
    attr_accessor :server

    # api adresas serveryje
    attr_accessor :address

    # serverio portas
    attr_accessor :port

    # druska
    attr_accessor :salt

    def initialize
      @server = "192.168.0.30"
      @port = "8080"
      @address = "/mor_api"
      @salt = "salt"
    end

  end

  # sukuriama nepavykus išsiųsti pranešimo API
  class CommunicationError < StandardError
  end

  class << self
    attr_accessor :configuration
    attr_accessor :link
  end

  # naudinga developmentui, konsolėje, kur neveikia environmento config.after_intialize
  def self.init
    self.configuration = Configuration.new
    self.link ||= XMLRPC::Client.new(self.configuration.server, self.configuration.address, self.configuration.port)
  end

  def self.configure
    self.configuration ||= Configuration.new
    yield(configuration)
    self.link ||= XMLRPC::Client.new(self.configuration.server, self.configuration.address, self.configuration.port)
  end

  # paymento sukūrimas. perduodamas mokančio vartotojo id ir suma floatu
  def self.payment_create(*args)
    true
    #return self.send("payment_create", *args)
  end

  def self.payment_update(id, a)
    true
  end

  # tikrina ar api gyvas ir pasiekiamas
  def self.ping
    return true
    #begin
      #return true if self.link.call("ping").eql?("0")
      #return false
    #rescue Timeout::Error, Errno::ECONNREFUSED
      #raise CommunicationError, "An error occured while trying to send message to API backend."
    #end
  end

  # universaus kvietimo metodas. argumentai - hashai

  def self.send(method, *args)
    args.collect!{ |a| a.to_s } # API priima argumentus kaip stringus
    begin
      return true if self.link.call(method, Digest::SHA1.hexdigest("#{args.join}#{self.configuration.salt}"), *args ).eql?("0")
      return false
    rescue Timeout::Error, Errno::ECONNREFUSED
      raise CommunicationError, "An error occured while trying to send message to API backend."
    end
  end

end