require "rubygems"
require "rubygems/dependency_installer"

begin
  require "rubygems/format"
rescue LoadError
  # rubygems 2.x
end

require "log4r"
require "vagrant/plugin/manager"

module VagrantPlugins
  module CommandPlugin
    module Action
      # This action takes the `:plugin_name` variable in the environment
      # and installs it using the RubyGems API.
      class InstallGem
        def initialize(app, env)
          @app    = app
          @logger = Log4r::Logger.new("vagrant::plugins::plugincommand::installgem")
        end

        def call(env)
          entrypoint  = env[:plugin_entry_point]
          plugin_name = env[:plugin_name]
          version     = env[:plugin_version]

          # Determine the plugin name we'll look for in the installed set
          # in order to determine the version and all that.
          find_plugin_name = plugin_name
          if plugin_name =~ /\.gem$/
            # If we're installing from a gem file, determine the name
            # based on the spec in the file.
            pkg = if defined?(Gem::Format)
              # RubyGems 1.x
              Gem::Format.from_file_by_path(plugin_name)
            else
              # RubyGems 2.x
              Gem::Package.new(plugin_name)
            end

            find_plugin_name = pkg.spec.name
            version = pkg.spec.version
          end

          # Install the gem
          plugin_name_label = plugin_name
          plugin_name_label += " --version '#{version}'" if version
          env[:ui].info(I18n.t("vagrant.commands.plugin.installing",
                               :name => plugin_name_label))

          manager = Vagrant::Plugin::Manager.instance
          plugin_spec = manager.install_plugin(
            plugin_name, version: version, require: entrypoint)

          # Record it so we can uninstall if something goes wrong
          @installed_plugin_name = plugin_spec.name

          # Tell the user
          env[:ui].success(I18n.t("vagrant.commands.plugin.installed",
                                  :name => plugin_spec.name,
                                  :version => plugin_spec.version.to_s))

          # If the plugin's spec includes a post-install message display it
          post_install_message = plugin_spec.post_install_message
          if post_install_message
            if post_install_message.is_a?(Array)
              post_install_message = post_install_message.join(" ")
            end

            env[:ui].info(I18n.t("vagrant.commands.plugin.post_install",
                                 :name => plugin_spec.name,
                                 :message => post_install_message.to_s))
          end

          # Continue
          @app.call(env)
        end

        def recover(env)
          # If any error happens, we uninstall it and remove it from
          # the state file. We can only do this if we successfully installed
          # the gem in the first place.
          if @installed_plugin_name
            new_env = env.dup
            new_env.delete(:interrupted)
            new_env[:plugin_name] = @installed_plugin_name
            new_env[:action_runner].run(Action.action_uninstall, new_env)
          end
        end
      end
    end
  end
end