autoload :IPAddr, '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, :l] do |local|
    local.desc 'Starts up the virtual machine(s)'
    local.arg_name 'FILTER', :optional => true #, :multiple => false
    local.command :start do |start|
      start.flag(:basebox,
        :desc => "The basebox to use. This value is passed to vagrant as the "+
          "`config.vm.box` option. The value here should be the name of an installed box or a "+
          "shorthand name of a box in HashiCorp's Atlas.",
        :arg_name => 'BASEBOX',
        :default_value => 'LEAP/wheezy'
      )
      start.action do |global_options,options,args|
        vagrant_command(["up", "sandbox on"], args, options)
      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 = Path.vagrant_ssh_pub_key_file
    Util.assert_files_exist! file_path
    uid = File.new(file_path).stat.uid
    if uid == 0 || uid == Process.euid
      FileUtils.install file_path, '/tmp/vagrant.key', :mode => 0600
      file_path = '/tmp/vagrant.key'
    end
    return file_path
  end

  protected

  def vagrant_command(cmds, args, options={})
    vagrant_setup(options)
    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(options)
    assert_bin! 'vagrant', 'Vagrant is required for running local virtual machines. Run "sudo apt-get install vagrant".'

    if vagrant_version <= Gem::Version.new('1.0.0')
      gem_path = assert_run!('vagrant gem which sahara')
      if gem_path.nil? || gem_path.empty? || gem_path =~ /^ERROR/
        log :installing, "vagrant plugin 'sahara'"
        assert_run! 'vagrant gem install sahara -v 0.0.13'
      end
    else
      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(options)
  end

  def vagrant_version
    @vagrant_version ||= Gem::Version.new(assert_run!('vagrant --version').split(' ')[1])
  end

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

  def create_vagrant_file(options)
    lines = []
    netmask = IPAddr.new('255.255.255.255').mask(LeapCli.leapfile.vagrant_network.split('/').last).to_s

    basebox = options[:basebox] || 'LEAP/wheezy'

    if vagrant_version <= Gem::Version.new('1.1.0')
      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 = "#{basebox}"]
          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
    else
      lines << %[Vagrant.configure("2") do |config|]
      manager.each_node do |node|
        if node.vagrant?
          lines << %[  config.vm.define :#{node.name} do |config|]
          lines << %[    config.vm.box = "#{basebox}"]
          lines << %[    config.vm.network :private_network, ip: "#{node.ip_address}"]
          lines << %[    config.vm.provider "virtualbox" do |v|]
          lines << %[      v.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]]
          lines << %[      v.name = "#{node.name}"]
          lines << %[    end]
          lines << %[    #{leapfile.custom_vagrant_vm_line}] if leapfile.custom_vagrant_vm_line
          lines << %[  end]
        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