#!/usr/bin/env ruby

# This example demonstrates how to resize servers with Fog and the Rackspace Open Cloud

require 'rubygems' #required for Ruby 1.8.x
require 'fog'

def get_user_input(prompt)
  print "#{prompt}: "
  gets.chomp
end

def select_flavor(flavors, server)  
  puts "\nSelect New Flavor Size:\n\n"
  flavors.each_with_index do |flavor, i|
    next if server.flavor_id == flavor.id
    puts "\t #{i}. #{flavor.name}"
  end

  selected_flavor_str = get_user_input "\nEnter Flavor Number"
  flavors[selected_flavor_str.to_i]
end

def select_server(servers)
  abort "\nThere are not any servers to resize in the Chicago region. Try running create_server.rb\n\n" if servers.empty?

  puts "\nSelect Server Resize:\n\n"
  servers.each_with_index do |server, i|
    puts "\t #{i}. #{server.name} [#{server.public_ip_address}]"
  end

  selected_str = get_user_input "\nEnter Server Number"
  servers[selected_str.to_i]
end

# Use username defined in ~/.fog file, if absent prompt for username. 
# For more details on ~/.fog refer to http://fog.io/about/getting_started.html
def rackspace_username
  Fog.credentials[:rackspace_username] || get_user_input("Enter Rackspace Username")
end

# Use api key defined in ~/.fog file, if absent prompt for api key
# For more details on ~/.fog refer to http://fog.io/about/getting_started.html
def rackspace_api_key
  Fog.credentials[:rackspace_api_key] || get_user_input("Enter Rackspace API key")
end

#create Next Generation Cloud Server service
service = Fog::Compute.new({
  :provider             => 'rackspace',
  :rackspace_username   => rackspace_username,
  :rackspace_api_key    => rackspace_api_key,
  :version => :v2,  # Use Next Gen Cloud Servers
  :rackspace_region => :ord #Use Chicago Region
})

#retrieve list of servers
servers = service.servers

#prompt user for server
server = select_server(servers)

# retrieve list of avaliable flavors
flavors = service.flavors

# prompt user for flavor
selected_flavor = select_flavor(flavors, server)

# resize server
server.resize selected_flavor.id

puts "\n"

# wait for the resize process to start
server.wait_for { ready?('RESIZE') } 

begin
  # Check every 5 seconds to see if server is in the VERIFY_RESIZE state. 
  # If the server has not been built in 5 minutes (600 seconds) an exception will be raised.
  server.wait_for(1200, 5) do
    print "."
    STDOUT.flush
    ready?('VERIFY_RESIZE', ['ACTIVE', 'ERROR'])
  end
  puts "[DONE]\n\n"
  
  puts "Server Has Been Successfully Resized!"
  action = get_user_input "Press 'C' To Confirm Or 'R' to Revert Resize (R/C)"

  case action.upcase
  when 'C'
    puts "\nConfirming Resize Operation"
    server.confirm_resize
  when 'R'
    puts "\nReverting Resize Operation"
    server.revert_resize
  else
    puts "\nUnrecognized Input. Exiting."
  end
  
rescue Fog::Errors::TimeoutError
  puts "[TIMEOUT]\n\n"
  
  puts "This server is currently #{server.progress}% into the resize process and is taking longer to complete than expected."
  puts "You can continute to monitor the build process through the web console at https://mycloud.rackspace.com/\n\n" 
end