#
# Copyright:: Copyright (c) 2014 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/policyfile_services/install'

module ChefDK
  module Command

    class Install < Base

      banner(<<-E)
Usage: chef install [ POLICY_FILE ] [options]

`chef install` evaluates a `Policyfile.rb` to find a compatible set of
cookbooks for the policy's run_list and caches them locally. It emits a
Policyfile.lock.json describing the locked cookbook set. You can use the
lockfile to install the locked cookbooks on another machine. You can also push
the lockfile to a "policy group" on a Chef Server and apply that exact set of
cookbooks to nodes in your infrastructure.

The Policyfile feature is incomplete and beta quality. See our detailed README
for more information.

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

Options:

E

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

      attr_reader :policyfile_relative_path

      attr_accessor :ui

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

        @policyfile_relative_path = nil
        @installer = nil
      end

      def run(params = [])
        apply_params!(params)
        installer.run
        0
      rescue PolicyfileServiceError => e
        handle_error(e)
        1
      end

      def installer
        @installer ||= PolicyfileServices::Install.new(policyfile: policyfile_relative_path, ui: ui, root_dir: Dir.pwd)
      end

      def debug?
        !!config[:debug]
      end

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

      def apply_params!(params)
        remaining_args = parse_options(params)
        if remaining_args.size > 1
          ui.err(banner)
          return 1
        else
          @policyfile_relative_path = remaining_args.first
        end
      end

    end
  end
end