class CalculateTip

# File lib/calculate-tip.rb, line 4
def initialize(amount = nil, tip = "15", currencie = nil)
        if amount.to_f < 0 or tip.to_f < 0
        raise ArgumentError.new("Amount is negative!")                    
        end

        @amount = amount.to_f
        @tip = tip.to_f 
        @currencie = currencie.to_s 
end

# File lib/calculate-tip.rb, line 22
def calculate
        calc_tip = (@amount * @tip) / 100
        total_amount = @amount + calc_tip

        puts "Total amount with tip: " + total_amount.to_s + " " + @currencie
        puts "Tip amount: " + calc_tip.to_s + " " + @currencie 
        puts "Calculation with external API "

        external_api = ExternalApi.new(@amount, @tip)
        puts external_api.calculate

        return
end

# File lib/calculate-tip.rb, line 14
def get_amount
        @amount
end

# File lib/calculate-tip.rb, line 18
def get_tip
        @tip
end