#
# Author:: Stuart Preston (<stuart@chef.io>)
# Copyright:: Copyright 2018, 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/json_compat"
require "win32ole" if RUBY_PLATFORM =~ /mswin|mingw32|windows/

class Chef
  class PowerShell

    attr_reader :result
    attr_reader :errors

    # Run a command under PowerShell via a managed (.NET) COM interop API.
    # This implementation requires the managed dll to be registered on the
    # target machine.
    #
    # Requires: .NET Framework 4.0 or higher on the target machine.
    #
    # @param script [String] script to run
    # @return [Object] output
    def initialize(script)
      raise "Chef::PowerShell can only be used on the Windows platform." unless RUBY_PLATFORM =~ /mswin|mingw32|windows/
      exec(script)
    end

    def error?
      return true if errors.count > 0
      false
    end

    private

    def exec(script)
      ps = WIN32OLE.new("Chef.PowerShell")
      outcome = ps.ExecuteScript(script)
      hashed_outcome = Chef::JSONCompat.parse(outcome)
      @result = Chef::JSONCompat.parse(hashed_outcome["result"])
      @errors = hashed_outcome["errors"]
    end
  end
end