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# gem install aws-sdk

require 'aws'


PRICES = {
  'm1.small' => 0.095,
  'm1.large' => 0.38,
  'm1.xlarge' => 0.76,
  't1.micro' => 0.025,
  'm2.xlarge' => 0.57,
  'm2.2xlarge' => 1.14,
  'm2.4xlarge' => 2.28,
  'c1.medium' => 0.19,
  'c1.xlarge' => 0.76
}

ACCESS_KEY = '...'
SECRET_KEY = '...'
ENDPOINT = 'eu-west-1.ec2.amazonaws.com'

ec2 = AWS::EC2.new(:access_key_id => ACCESS_KEY, :secret_access_key => SECRET_KEY, :ec2_endpoint => ENDPOINT)

cost_per_hour_by_type = AWS.memoize do
  running_instances = ec2.instances.select { |i| i.status == :running }
  running_instances.reduce(Hash.new(0)) { |acc, i| acc[i.instance_type] += PRICES[i.instance_type]; acc }
end

total_cost = 0

cost_per_hour_by_type.keys.sort.each do |instance_type|
  cost = cost_per_hour_by_type[instance_type]
  total_cost += cost
  puts(sprintf('%-10.10s %5.2f', instance_type, cost))
end

puts(sprintf('%-10.10s %5.2f', 'total', total_cost))