# Copyright (c) 2011 VMware, Inc.  All Rights Reserved.
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
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# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# THE SOFTWARE.

opts :create do
  summary "Create a resource pool"
  arg :name, "Name of the new resource pool."
  arg :parent, nil, :lookup => RbVmomi::VIM::ResourcePool
  opt :cpu_limit, "CPU limit in Mhz", :type => :int
  opt :cpu_reservation, "CPU reservation in Mhz", :type => :int
  opt :cpu_shares, "CPU shares level or number", :default => 'normal'
  opt :cpu_expandable, "Whether CPU reservation can be expanded"
  opt :mem_limit, "Memory limit in MB", :type => :int
  opt :mem_reservation, "Memory reservation in MB", :type => :int
  opt :mem_shares, "Memory shares level or number", :default => 'normal'
  opt :mem_expandable, "Whether memory reservation can be expanded"
end

def shares_from_string str
  case str
  when 'normal', 'low', 'high'
    { :level => str, :shares => 0 }
  when /^\d+$/
    { :level => 'custom', :shares => str.to_i }
  else
    err "Invalid shares argument #{str.inspect}"
  end
end

def create name, parent, opts
  spec = {
    :cpuAllocation => {
      :limit => opts[:cpu_limit],
      :reservation => opts[:cpu_reservation],
      :expandableReservation => opts[:cpu_expandable],
      :shares => shares_from_string(opts[:cpu_shares]),
    },
    :memoryAllocation => {
      :limit => opts[:mem_limit],
      :reservation => opts[:mem_reservation],
      :expandableReservation => opts[:mem_expandable],
      :shares => shares_from_string(opts[:mem_shares]),
    },
  }
  parent.CreateResourcePool(:name => name, :spec => spec)
end


opts :update do
  summary "Update a resource pool"
  arg :pool, nil, :lookup => RbVmomi::VIM::ResourcePool
  opt :name, "New name for the resource pool", :type => :string
  opt :cpu_limit, "CPU limit in Mhz", :type => :int
  opt :cpu_reservation, "CPU reservation in Mhz", :type => :int
  opt :cpu_shares, "CPU shares level or number", :default => 'normal'
  opt :cpu_expandable, "Whether CPU reservation can be expanded"
  opt :mem_limit, "Memory limit in MB", :type => :int
  opt :mem_reservation, "Memory reservation in MB", :type => :int
  opt :mem_shares, "Memory shares level or number", :default => 'normal'
  opt :mem_expandable, "Whether memory reservation can be expanded"
end

def update pool, opts
  spec = {
    :cpuAllocation => {
      :limit => opts[:cpu_limit],
      :reservation => opts[:cpu_reservation],
      :expandableReservation => opts[:cpu_expandable],
      :shares => shares_from_string(opts[:cpu_shares]),
    },
    :memoryAllocation => {
      :limit => opts[:mem_limit],
      :reservation => opts[:mem_reservation],
      :expandableReservation => opts[:mem_expandable],
      :shares => shares_from_string(opts[:mem_shares]),
    },
  }
  pool.UpdateConfig(:name => opts[:name], :spec => spec)
end


opts :storage do
  summary "Show the storage used by a resource pool hierarchy"
  arg :pool, nil, :lookup => VIM::ResourcePool
end

def storage root
  propSet = [
    { :type => 'ResourcePool', :pathSet => ['name', 'parent'] },
    { :type => 'VirtualMachine', :pathSet => ['name', 'parent', 'storage', 'resourcePool'] }
  ]

  filterSpec = RbVmomi::VIM.PropertyFilterSpec(
    :objectSet => [
      :obj => root,
      :selectSet => [
        RbVmomi::VIM.TraversalSpec(
          :name => 'tsResourcePool1',
          :type => 'ResourcePool',
          :path => 'resourcePool',
          :skip => false,
          :selectSet => [
            RbVmomi::VIM.SelectionSpec(:name => 'tsResourcePool1'),
            RbVmomi::VIM.SelectionSpec(:name => 'tsResourcePool2')
          ]
        ),
        RbVmomi::VIM.TraversalSpec(
          :name => 'tsResourcePool2',
          :type => 'ResourcePool',
          :path => 'vm',
          :skip => false,
          :selectSet => [
            RbVmomi::VIM.SelectionSpec(:name => 'tsResourcePool1'),
            RbVmomi::VIM.SelectionSpec(:name => 'tsResourcePool2')
          ]
        )
      ]
    ],
    :propSet => propSet
  )

  result = root._connection.propertyCollector.RetrieveProperties(:specSet => [filterSpec])

  objs = Hash[result.map { |r| [r.obj, r] }]
  usages = Hash.new { |h,k| h[k] = 0 }

  objs.each do |obj,r|
    next unless obj.is_a? VIM::VirtualMachine
    cur = r['resourcePool']
    usage = r['storage'].perDatastoreUsage.map(&:unshared).sum
    while cur
      usages[cur] += usage
      cur = cur == root ? nil : objs[cur]['parent']
    end
  end

  children = Hash.new { |h,k| h[k] = [] }
  objs.each { |obj,r| children[r['parent']] << obj }

  display = lambda do |level,obj|
    puts "#{' '*level}#{objs[obj]['name']}: #{usages[obj].metric}B"
    children[obj].each do |child|
      display[level+1, child]
    end
  end

  display[0, root]
end