#
# Copyright (c) 2010-2011 RightScale Inc
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

module RightScale

  # Base class to dynamically generated Powershell Chef providers
  class PowershellProviderBase < Chef::Provider

    def initialize(new_resource, run_context)
      super(new_resource, run_context)
      self.class.init(@run_context.node)
      # Have to wait until the Chef node server has been initialized before setting the new resource
      RightScale::Windows::ChefNodeServer.instance.new_resource = @new_resource
    end

    # Initialize Powershell host, should be called before :run and :terminate
    #
    # === Return
    # true:: If init script must be run
    # false:: Otherwise
    def self.init(node)
      run_init = @ps_instance.nil?
      @ps_instance = PowershellHost.new(:node => node, :provider_name => self.to_s.gsub("::", "_")) unless @ps_instance
      run_init
    end

    # Run powershell script in associated Powershell instance
    #
    # === Parameters
    # script(String):: Fully qualified path to Powershell script
    #
    # === Return
    # true:: Always return true
    def self.run_script(script)
      if @ps_instance
        res = @ps_instance.run(script)

        # the powershell provider script the host runs will return exit code of 100 if the last action threw an exception.
        if res && res[:exit_code] && res[:exit_code] != 0
          message = "Unexpected exit code from action. Expected 0 but returned #{res[:exit_code]}.  Script: #{script}\n"
          message += "#{res[:error_msg]}"
          raise RightScale::Exceptions::Exec, message
        end
      end

      true
    end

    # Terminate Powershell process if it was started
    #
    # === Return
    # true:: Always return true
    def self.terminate
      if @ps_instance
        begin
          @ps_instance.terminate
        ensure
          @ps_instance = nil
        end
      end
      true
    end

    # Must override Chef's load_current_resource
    #
    # === Return
    # true:: Always return true
    def load_current_resource
      # Dummy
    end
  end

end