#
# Copyright:: Copyright (c) 2015-2019 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 "base"
require_relative "../ui"
require_relative "../configurable"
require_relative "../policyfile_services/clean_policy_cookbooks"
require_relative "../dist"

module ChefCLI
  module Command

    class CleanPolicyCookbooks < Base

      banner(<<~BANNER)
        Usage: #{ChefCLI::Dist::EXEC} clean-policy-cookbooks [options]

        `#{ChefCLI::Dist::EXEC} clean-policy-cookbooks` deletes unused Policyfile cookbooks. Cookbooks
        are considered unused when they are not referenced by any Policyfile revision
        on the #{ChefCLI::Dist::SERVER_PRODUCT}. Note that cookbooks which are referenced by "orphaned" policy
        revisions are not removed, so you may wish to run `chef clean-policy-revisions`
        to remove orphaned policies before running this command.

        See our detailed README for more information:

        https://docs.chef.io/policyfile/

        Options:

      BANNER

      option :config_file,
        short:        "-c CONFIG_FILE",
        long:         "--config CONFIG_FILE",
        description:  "Path to configuration file"

      option :debug,
        short:        "-D",
        long:         "--debug",
        description:  "Enable stacktraces and other debug output",
        default:      false

      include Configurable

      attr_accessor :ui

      attr_reader :policy_name

      attr_reader :policy_group

      def initialize(*args)
        super
        @ui = UI.new

        @clean_policy_cookbooks_service = nil
      end

      def run(params)
        return 1 unless apply_params!(params)

        clean_policy_cookbooks_service.run
        0
      rescue PolicyfileServiceError => e
        handle_error(e)
        1
      end

      def clean_policy_cookbooks_service
        @clean_policy_cookbooks_service ||=
          PolicyfileServices::CleanPolicyCookbooks.new(config: chef_config, ui: ui)
      end

      def debug?
        !!config[:debug]
      end

      def handle_error(error)
        ui.err("Error: #{error.message}")
        if error.respond_to?(:reason)
          ui.err("Reason: #{error.reason}")
          ui.err("")
          ui.err(error.extended_error_info) if debug?
          ui.err(error.cause.backtrace.join("\n")) if debug?
        end
      end

      def apply_params!(params)
        remaining_args = parse_options(params)

        if !remaining_args.empty?
          ui.err("Too many arguments")
          ui.err("")
          ui.err(opt_parser)
          false
        else
          true
        end
      end

    end
  end
end