require 'ipaddr'
require 'fileutils'

module LeapCli; module Commands

  desc "Manage local virtual machines."
  long_desc "This command provides a convient way to manage Vagrant-based virtual machines. If FILTER argument is missing, the command runs on all local virtual machines. The Vagrantfile is automatically generated in 'test/Vagrantfile'. If you want to run vagrant commands manually, cd to 'test'."
  command :local do |local|
    local.desc 'Starts up the virtual machine(s)'
    local.arg_name 'FILTER', :optional => true #, :multiple => false
    local.command :start do |start|
      start.action do |global_options,options,args|
        vagrant_command(["up", "sandbox on"], args)
      end
    end

    local.desc 'Shuts down the virtual machine(s)'
    local.arg_name 'FILTER', :optional => true #, :multiple => false
    local.command :stop do |stop|
      stop.action do |global_options,options,args|
        if global_options[:yes]
          vagrant_command("halt --force", args)
        else
          vagrant_command("halt", args)
        end
      end
    end

    local.desc 'Destroys the virtual machine(s), reclaiming the disk space'
    local.arg_name 'FILTER', :optional => true #, :multiple => false
    local.command :destroy do |destroy|
      destroy.action do |global_options,options,args|
        if global_options[:yes]
          vagrant_command("destroy --force", args)
        else
          vagrant_command("destroy", args)
        end
      end
    end

    local.desc 'Print the status of local virtual machine(s)'
    local.arg_name 'FILTER', :optional => true #, :multiple => false
    local.command :status do |status|
      status.action do |global_options,options,args|
        vagrant_command("status", args)
      end
    end

    local.desc 'Saves the current state of the virtual machine as a new snapshot'
    local.arg_name 'FILTER', :optional => true #, :multiple => false
    local.command :save do |status|
      status.action do |global_options,options,args|
        vagrant_command("sandbox commit", args)
      end
    end

    local.desc 'Resets virtual machine(s) to the last saved snapshot'
    local.arg_name 'FILTER', :optional => true #, :multiple => false
    local.command :reset do |reset|
      reset.action do |global_options,options,args|
        vagrant_command("sandbox rollback", args)
      end
    end
  end

  public

  #
  # returns the path to a vagrant ssh key file.
  #
  # if the vagrant.key file is owned by root or ourselves, then
  # we need to make sure that it owned by us and not world readable.
  #
  def vagrant_ssh_key_file
    file_path = File.expand_path('../../../vendor/vagrant_ssh_keys/vagrant.key', File.dirname(__FILE__))
    Util.assert_files_exist! file_path
    uid = File.new(file_path).stat.uid
    if uid == 0 || uid == Process.euid
      FileUtils.cp file_path, '/tmp/vagrant.key'
      FileUtils.chmod 0600, '/tmp/vagrant.key'
      file_path = '/tmp/vagrant.key'
    end
    return file_path
  end

  protected

  def vagrant_command(cmds, args)
    vagrant_setup
    cmds = cmds.to_a
    if args.empty?
      nodes = [""]
    else
      nodes = manager.filter(args)[:environment => "local"].field(:name)
    end
    if nodes.any?
      vagrant_dir = File.dirname(Path.named_path(:vagrantfile))
      exec = ["cd #{vagrant_dir}"]
      cmds.each do |cmd|
        nodes.each do |node|
          exec << "vagrant #{cmd} #{node}"
        end
      end
      execute exec.join('; ')
    else
      bail! "No nodes found. This command only works on nodes with ip_address in the network #{LeapCli.leapfile.vagrant_network}"
    end
  end

  private

  def vagrant_setup
    assert_bin! 'vagrant', 'Vagrant is required for running local virtual machines. Run "sudo apt-get install vagrant".'

    version = vagrant_version 
    case version
      when 0..1
        unless assert_run!('vagrant gem which sahara').chars.any?
          log :installing, "vagrant plugin 'sahara'"
          assert_run! 'vagrant gem install sahara'
        end
      when 2
        unless assert_run!('vagrant plugin list | grep sahara | cat').chars.any?
          log :installing, "vagrant plugin 'sahara'"
          assert_run! 'vagrant plugin install sahara'
        end
    end
    create_vagrant_file
  end

  def vagrant_version
    minor_version = `vagrant --version|cut -d' ' -f 3 | cut -d'.' -f 2`.to_i
    version = case minor_version
      when 1..9 then 2 
      when 0    then 1
      else 0
    end
    return version
  end

  def execute(cmd)
    log 2, :run, cmd
    exec cmd
  end

  def create_vagrant_file
    lines = []
    netmask = IPAddr.new('255.255.255.255').mask(LeapCli.leapfile.vagrant_network.split('/').last).to_s
    lines << %[Vagrant::Config.run do |config|]
    manager.each_node do |node|
      if node.vagrant?
        lines << %[  config.vm.define :#{node.name} do |config|]
        lines << %[    config.vm.box = "leap-wheezy"]
        lines << %[    config.vm.box_url = "http://download.leap.se/leap-debian.box"]
        lines << %[    config.vm.network :hostonly, "#{node.ip_address}", :netmask => "#{netmask}"]
        lines << %[    config.vm.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]]
        lines << %[    config.vm.customize ["modifyvm", :id, "--name", "#{node.name}"]]
        lines << %[    #{leapfile.custom_vagrant_vm_line}] if leapfile.custom_vagrant_vm_line
        lines << %[  end]
      end
    end
    lines << %[end]
    lines << ""
    write_file! :vagrantfile, lines.join("\n")
  end

  def pick_next_vagrant_ip_address
    taken_ips = manager.nodes[:environment => "local"].field(:ip_address)
    if taken_ips.any?
      highest_ip = taken_ips.map{|ip| IPAddr.new(ip)}.max
      new_ip = highest_ip.succ
    else
      new_ip = IPAddr.new(LeapCli.leapfile.vagrant_network).succ.succ
    end
    return new_ip.to_s
  end

end; end