#!/usr/bin/env ruby

# request spot instance requests

require 'aws-sdk'
require 'pry'

instance_type = ['m4.4xlarge']

ec2 = Aws::EC2::Resource.new(region: 'us-west-2')
spot_price = ec2.client.describe_spot_price_history(
  instance_types: instance_type,
  product_descriptions: ['Linux/UNIX'],
  start_time: (Time.now - 1).iso8601(3),
  end_time: Time.now.iso8601(3)
)

h = {}

spot_price[:spot_price_history].each do |sp|
  puts "#{sp[:instance_type]} #{sp[:availability_zone]} at $#{sp[:spot_price]}"
  h.store(sp[:availability_zone], sp[:spot_price].to_f)
end

min_spot_price = h.select { |_k, v| v == h.values.min }

puts min_spot_price

puts "$#{h.values.min} is the lowest price, this is #{(h.values.min.to_f/0.862*100)}%"
puts "hourly savings: $#{(0.862 - h.values.min.to_f)} "
puts "daily savings: $#{(0.862 - h.values.min.to_f) * 24}"
puts "monthly savings: $#{(0.862 - h.values.min.to_f) * 24 * 31}"