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# distributed with this work for additional information
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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
#
#   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.


module Qpid::Proton
  # Allow a {Receiver} to indicate the status of a received message to the {Sender}
  class Delivery < Transfer
    def initialize(*args) super; @message = nil; end

    # @return [Receiver] The parent {Receiver} link.
    def receiver() link; end

    # Accept the receiveed message.
    def accept() settle ACCEPTED; end

    # Reject a message, indicating to the sender that is invalid and should
    # never be delivered again to this or any other receiver.
    def reject() settle REJECTED; end

    # Release a message, indicating to the sender that it was not processed
    # but may be delivered again to this or another receiver.
    #
    # @param opts [Hash] Instructions to the sender to modify re-delivery.
    #  To allow re-delivery with no modifications at all use +release(nil)+
    #
    # @option opts [Boolean] :failed (true) Instruct the sender to increase
    #  {Message#delivery_count} so future receivers will know there was a
    #  previous failed delivery.
    #
    # @option opts [Boolean] :undeliverable (false) Instruct the sender that this
    #  message should never be re-delivered to this receiver, although it may be
    #  delivered other receivers.
    #
    # @option opts [Hash] :annotations Instruct the sender to update the
    #  {Message#annotations} with these +key=>value+ pairs before re-delivery,
    #  replacing existing entries in {Message#annotations} with the same key.
    def release(opts = nil)
      opts = { :failed => false } if (opts == false) # deprecated
      failed = !opts || opts.fetch(:failed, true)
      undeliverable = opts && opts[:undeliverable]
      annotations = opts && opts[:annotations]
      annotations = nil if annotations && annotations.empty?
      if failed || undeliverable || annotations
        d = Cproton.pn_delivery_local(@impl)
        Cproton.pn_disposition_set_failed(d, true) if failed
        Cproton.pn_disposition_set_undeliverable(d, true) if undeliverable
        Codec::Data.from_object(Cproton.pn_disposition_annotations(d), annotations) if annotations
        settle(MODIFIED)
      else
        settle(RELEASED)
      end
    end

    # @deprecated use {#release} with modification options
    def modify()
      deprecated __method__, "release(modification_options)"
      release failed=>true
    end

    # @return [Boolean] True if the transfer was aborted by the sender.
    proton_caller :aborted?

    # @return true if the incoming message is complete, call {#message} to retrieve it.
    def complete?() readable? && !aborted? && !partial?; end

    # Get the message from the delivery.
    # @return [Message] The message
    # @raise [AbortedError] if the message has been aborted (check with {#aborted?}
    # @raise [UnderflowError] if the message is incomplete (check with {#complete?}
    # @raise [::ArgumentError] if the delivery is not the current delivery on a receiving link.
    def message
      unless @message
        raise AbortedError, "message aborted by sender" if aborted?
        raise UnderflowError, "incoming message incomplete" if partial?
        raise ArgumentError, "no incoming message" unless readable?
        @message = Message.new
        @message.decode(link.receive(pending))
        link.advance
      end
      @message
    end
  end
end