class Converter

# File lib/ExchangeRateVlad.rb, line 41
def at(date, c1, c2)
        d = date.strftime("%Y-%m-%d")
        r = @@doc.css('Cube Cube[@time="'+d+'"]')
        if r.size==0
                p 'No data for the specified time of exchange rate: ' + d
                return -1
        end
        begin
                if c1 == 'EUR'
                        er1 = 1.0
                else
                        er1 = r.at_css('[@currency="'+c1+'"]')['rate'].to_f
                end
        rescue
                p 'Something is wrong with this currency: ' + c1
                return -1
        end
        begin
                if c2 == 'EUR'
                        er2 = 1.0
                else
                        er2 = r.at_css('[@currency="'+c2+'"]')['rate'].to_f
                end
        rescue
                p 'Something is wrong with this currency: ' + c2
                return -1
        end
        return er2/er1
end

# File lib/ExchangeRateVlad.rb, line 27
def get_currencies()
    c = @@doc.css('Cube Cube').first.css('Cube')
    for x in c
            @@currencies.push(x['currency'])
    end
    return @@currencies
end

# File lib/ExchangeRateVlad.rb, line 34
def get_times()
    c = @@doc.css('Cube Cube[@time]')
    for x in c
            @@times.push(x['time'])
    end
    return @@times
end

# File lib/ExchangeRateVlad.rb, line 6
def init(file)
    if file.start_with?('http://') || file.start_with?('https://')
            require 'open-uri'
            begin 
                            @@doc = Nokogiri::XML(open(file))
            rescue
                    p "Unable to open location"
                    return false
            end
    else
            begin
                    f = File.open(file)
                            @@doc = Nokogiri::XML(f)
                            f.close
                    rescue
                            p 'Unable to open Location'
                            return false
                    end
            end
            return true
end