require 'rest_client'
require 'nokogiri'

module Pandorified
  API_URL = 'https://www.pandorabots.com/pandora/talk-xml'

  class Result
    def initialize(params)
      @xml = Nokogiri::XML(RestClient.post(API_URL, params))
    end

    # @return [String] The bot's response to the input.
    def that
      @that ||= @xml.xpath('/result/that').first.text.strip
    end

    alias_method :to_s, :that

    # Check the status of this result. See {#success?} and {#error?}.
    #
    # @return [Number] A status number as returned by Pandorabots.
    def status
      @status ||= @xml.xpath('/result/@status').first.value.to_i
    end

    # @return `true` if this result was successful (no error was returned by Pandorabots), `false` otherwise.
    def success?
      self.status.zero?
    end

    alias_method :ok?, :success?
    alias_method :successful?, :success?

    # @note After checking if there is an error, you can read the error message with {#message}.
    #
    # @return `true` if Pandorabots returned an error.
    def error?
      !self.success?
    end

    # @return [String] The error message as returned by Pandorabots, if an error occured.
    def message
      return nil if self.success?
      @message ||= @xml.xpath('/result/message').first.text
    end

    alias_method :error, :message
    alias_method :error_message, :message

    # @return [String] The botid of the bot this result is for.
    def botid
      @botid ||= @xml.xpath('/result/@botid').first.value
    end

    # @return [String] The custid for this session.
    def custid
      @custid ||= @xml.xpath('/result/@custid').first.value
    end

    # @return [String] The orginal input that triggered this response.
    def input
      @input ||= @xml.xpath('/result/input').first.text
    end
  end
end