class Money

# File lib/waehrungsrechner/money.rb, line 6
def initialize amount, base_currency
  raise ArgumentError, "Amount must be a number" unless amount.is_a? Numeric
  raise ArgumentError, " `#{base_currency}` is invalid (currency symbol must be a 3 character string)`#{base_currency}` is invalid." unless valid_currency? base_currency
  begin
    @rate_info = HTTParty.get "http://api.fixer.io/latest?base=#{base_currency}"
    raise ArgumentError, "`#{base_currency}` is an invalid currency symbol." if @rate_info.include? 'error'
  rescue Exception => e
    puts "Something went wrong. Please make sure are connected to the internet."
    puts e.inspect
  end
  base_currency.upcase!
  @amount = amount
  @base_currency = base_currency
end

# File lib/waehrungsrechner/money.rb, line 36
def +(other)
  if base_currency == other.base_currency
    Money.new(amount + other.amount, base_currency)
  else
    # maybe ask the user?
    puts "Which currency would you like to see the total in?\n1.#{base_currency}\n2.#{other.base_currency}"
    answer = gets.chomp
    case answer.upcase
    # calculate the total in the base currency
    when '1', "#{base_currency}"
      Money.new(amount + other.conversion_amount(base_currency), base_currency)
      # calculate the total in the transfer currency
    when '2', "#{other.base_currency}"
      Money.new(self.conversion_amount(other.base_currency) + other.amount, other.base_currency)
    end
  end
end

# File lib/waehrungsrechner/money.rb, line 31
def conversion_amount transfer_currency
  convert_to(transfer_currency).amount
end

# File lib/waehrungsrechner/money.rb, line 25
def convert_to transfer_currency
  raise ArgumentError, "`#{transfer_currency}` must be a 3 character string" unless transfer_currency.is_a?(String) && transfer_currency.length == 3
  raise ArgumentError, "`#{transfer_currency}` is either an invalid currency symbol, or it is not currently supported." unless (rates = @rate_info['rates']) && rates.keys.include?(transfer_currency)
  Money.new(amount * rates[transfer_currency], transfer_currency)
end

# File lib/waehrungsrechner/money.rb, line 21
def inspect
  "#{('%.2f' % amount)} #{base_currency.upcase}"
end

# File lib/waehrungsrechner/money.rb, line 56
def valid_currency? currency
  currency.is_a?(String) && currency.length == 3
end