module HelixVersioningEngine
  class SubmitService

    # Require the p4 connection decided by our middleware
    attr_accessor :p4

    # Existing Rack environment
    attr_accessor :env

    def initialize(p4: nil, env: nil)
      @p4 = p4
      @env = env

      # This is created by `submit_shelf`
      @p4_root = nil
    end

    # Perform a 'p4 submit -e change'
    #
    # This will need to detect the correct kind of temporary client to create,
    # create that, and then perform the submission.
    def submit_shelf(change)
      stream_client = stream_client_for(change)
      if stream_client
        @p4_root = P4Util.create_temp_stream_client_duplicate(p4, stream_client)
        env['p4_root'] = @p4_root
      else
        @p4_root = P4Util.create_temp_client(p4)
        env['p4_root'] = @p4_root
      end
      p4.run_submit('-e', change)
    end

    # Returns true if the changelist is associated with a Streams-based client.
    def stream_client_for(change)
      change_spec = p4.fetch_change(change)

      client_spec = p4.fetch_client(change_spec._client)

      client_spec._stream.nil? ? nil : client_spec
    end
  end
end