#
# Copyright:: Copyright (c) 2015 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 'chef-dk/command/base'
require 'chef-dk/ui'
require 'chef-dk/configurable'
require 'chef-dk/policyfile_services/rm_policy'

module ChefDK
  module Command


    class DeletePolicy < Base

      banner(<<-BANNER)
Usage: chef delete-policy POLICY_NAME [options]

`chef delete-policy POLICY_NAME` deletes all revisions of the policy
`POLICY_NAME` on the configured Chef Server. All policy revisions will be
backed up locally, allowing you to undo this operation via the `chef undelete`
command.

See our detailed README for more information:

https://github.com/chef/chef-dk/blob/master/POLICYFILE_README.md

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

      def initialize(*args)
        super
        @policy_name = nil
        @rm_policy_service = nil
        @ui = UI.new
      end

      def run(params)
        return 1 unless apply_params!(params)
        rm_policy_service.run
        ui.msg("This operation can be reversed by running `chef undelete --last`.")
        0
      rescue PolicyfileServiceError => e
        handle_error(e)
        1
      end

      def rm_policy_service
        @rm_policy_service ||=
          PolicyfileServices::RmPolicy.new(config: chef_config,
                                           ui: ui,
                                           policy_name: policy_name)
      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.size == 1
          @policy_name = remaining_args.first
          true
        elsif remaining_args.empty?
          ui.err("You must specify the POLICY_NAME to delete.")
          ui.err("")
          ui.err(opt_parser)
          false
        else
          ui.err("Too many arguments")
          ui.err("")
          ui.err(opt_parser)
          false
        end
      end

    end
  end
end