#
# Author:: Adam Jacob (<adam@chef.io>)
# Copyright:: Copyright 2009-2017, Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

require_relative "../knife"
require_relative "../dist"

class Chef
  class Knife
    class Configure < Knife
      attr_reader :chef_server, :new_client_name, :admin_client_name, :admin_client_key
      attr_reader :chef_repo, :new_client_key, :validation_client_name, :validation_key

      deps do
        require_relative "../util/path_helper"
        require "ohai" unless defined?(Ohai::System)
        Chef::Knife::ClientCreate.load_deps
        Chef::Knife::UserCreate.load_deps
      end

      banner "knife configure (options)"

      option :repository,
        short: "-r REPO",
        long: "--repository REPO",
        description: "The path to the chef-repo."

      option :initial,
        short: "-i",
        long: "--initial",
        boolean: true,
        description: "Use to create a API client, typically an administrator client on a freshly-installed server."

      option :admin_client_name,
        long: "--admin-client-name NAME",
        description: "The name of the client, typically the name of the admin client."

      option :admin_client_key,
        long: "--admin-client-key PATH",
        description: "The path to the private key used by the client, typically a file named admin.pem."

      option :validation_client_name,
        long: "--validation-client-name NAME",
        description: "The name of the validation client, typically a client named chef-validator."

      option :validation_key,
        long: "--validation-key PATH",
        description: "The path to the validation key used by the client, typically a file named validation.pem."

      def configure_chef
        # We are just faking out the system so that you can do this without a key specified
        Chef::Config[:node_name] = "woot"
        super
        Chef::Config[:node_name] = nil
      end

      def run
        FileUtils.mkdir_p(chef_config_path)

        ask_user_for_config

        confirm("Overwrite #{config_file_path}") if ::File.exist?(config_file_path)

        ::File.open(config_file_path, "w") do |f|
          f.puts <<~EOH
            [default]
            client_name     = '#{new_client_name}'
            client_key      = '#{new_client_key}'
            chef_server_url = '#{chef_server}'
          EOH
        end

        if config[:initial]
          ui.msg("Creating initial API user...")
          Chef::Config[:chef_server_url] = chef_server
          Chef::Config[:node_name] = admin_client_name
          Chef::Config[:client_key] = admin_client_key
          user_create = Chef::Knife::UserCreate.new
          user_create.name_args = [ new_client_name ]
          user_create.config[:user_password] = config[:user_password] ||
            ui.ask("Please enter a password for the new user: ") { |q| q.echo = false }
          user_create.config[:admin] = true
          user_create.config[:file] = new_client_key
          user_create.config[:yes] = true
          user_create.config[:disable_editing] = true
          user_create.run
        else
          ui.msg("*****")
          ui.msg("")
          ui.msg("You must place your client key in:")
          ui.msg("  #{new_client_key}")
          ui.msg("Before running commands with Knife")
          ui.msg("")
          ui.msg("*****")
        end

        ui.msg("Knife configuration file written to #{config_file_path}")
      end

      def ask_user_for_config
        server_name = guess_servername
        @chef_server = config[:chef_server_url] || ask_question("Please enter the chef server URL: ", default: "https://#{server_name}/organizations/myorg")
        if config[:initial]
          @new_client_name        = config[:node_name] || ask_question("Please enter a name for the new user: ", default: Etc.getlogin)
          @admin_client_name      = config[:admin_client_name] || ask_question("Please enter the existing admin name: ", default: "admin")
          @admin_client_key       = config[:admin_client_key] || ask_question("Please enter the location of the existing admin's private key: ", default: "#{Chef::Dist::SERVER_CONF_DIR}/admin.pem")
          @admin_client_key       = File.expand_path(@admin_client_key)
        else
          @new_client_name = config[:node_name] || ask_question("Please enter an existing username or clientname for the API: ", default: Etc.getlogin)
        end

        @new_client_key = config[:client_key] || File.join(chef_config_path, "#{@new_client_name}.pem")
        @new_client_key = File.expand_path(@new_client_key)
      end

      # @return [String] our best guess at what the servername should be using Ohai data and falling back to localhost
      def guess_servername
        o = Ohai::System.new
        o.all_plugins(%w{ os hostname fqdn })
        o[:fqdn] || o[:machinename] || o[:hostname] || "localhost"
      end

      # @return [String] the path to the user's .chef directory
      def chef_config_path
        @chef_config_path ||= Chef::Util::PathHelper.home(".chef")
      end

      # @return [String] the full path to the config file (credential file)
      def config_file_path
        @config_file_path ||= ::File.expand_path(::File.join(chef_config_path, "credentials"))
      end
    end
  end
end
