class Coins

# File lib/coins.rb, line 39
def args? this
  if ARGV.include? this
    return true
  end
  return false
end

# File lib/coins.rb, line 46
def currencyConvert from, to
  return @exchange['rates'][to].to_f * from.to_f
end

# File lib/coins.rb, line 14
  def help
    help = <<EOF

      A simple live terminal currency exchange rate converter in Ruby
      The currencies are retrieved from fixer.io which is a
      'Foreign exchange rates and currency conversion API'
      which is a JSON API published by the 'European Central Bank'.

      The rates are updated daily around 4 PM CET

      Usage:
        `coins [rate(s)] [base/against] / [from] num(float/int ){CUR} [to] {CUR}`
      where CUR is the three letter currency
      (e.g. USD, GBP NOK, EUR, RUB, etc...)
        use 'from `n` `CUR` to `CUR(other)`' toconvert between currencies.
        use 'rates' to list all rates (see `base` also) or 'rate `CUR`'
      to see the rate for one single currency.
        use 'base `CUR`' or 'agains `CUR`' to change what the exchange
        rates compare to.
      Default rate base is USD

EOF
    puts help
  end

# File lib/coins.rb, line 61
def parseArgs
  if ARGV.empty? || args?('help') || args?('h') || args?('-h') || args?('--h')
    help
    exit 1
  end

  if args?('base')
    setRate(ARGV[ARGV.index('base') + 1].upcase)
  end

  unless args?('base') || args?('against') || args?('from')
    puts "No base rate set,\nset base rate by typing 'base' and than the three letter currency.\nDefaulting to USD.\n\n"
    setRate('USD')
  end

  if args?('against')
    setRate(ARGV[ARGV.index('against') + 1].upcase)
  end

  if args?('rates')
    rates
  end

  if args?('rate')
    puts rate ARGV[ARGV.index('rate') + 1].upcase
  end

  if args?('from') && args?('to')
    setRate(ARGV[ARGV.index('from') + 2].upcase)
    from = ARGV[ARGV.index('from') + 1].to_f
    to = ARGV[ARGV.index('to') + 1].upcase
    puts currencyConvert from, to
  end
end

# File lib/coins.rb, line 56
def rate currency
  return @exchange['rates'][currency].to_s
end

# File lib/coins.rb, line 50
def rates
  @exchange['rates'].each do |types|
    print types.to_s + "\n"
  end
end

# File lib/coins.rb, line 5
def setRate base
  begin
    @exchange = JSON.parse Net::HTTP.get(URI 'http://api.fixer.io/latest?base=' + base)
  rescue
    puts "Could not get exchange rate information.\nCheck your internet connnection or try again later."
    exit 1
  end
end