require "spec_helper"

describe Rdkafka::Producer do
  let(:producer) { rdkafka_config.producer }

  after do
    # Registry should always end up being empty
    expect(Rdkafka::Producer::DeliveryHandle::REGISTRY).to be_empty
  end

  context "delivery callback" do
    it "should set the callback" do
      expect {
        producer.delivery_callback = lambda do |delivery_handle|
          puts stats
        end
      }.not_to raise_error
      expect(producer.delivery_callback).to be_a Proc
    end

    it "should not accept a callback that's not a proc" do
      expect {
        producer.delivery_callback = 'a string'
      }.to raise_error(TypeError)
    end

    it "should call the callback when a message is delivered" do
      @callback_called = false

      producer.delivery_callback = lambda do |report|
        expect(report).not_to be_nil
        expect(report.partition).to eq 1
        expect(report.offset).to be >= 0
        @callback_called = true
      end

      # Produce a message
      handle = producer.produce(
        topic:   "produce_test_topic",
        payload: "payload",
        key:     "key"
      )

      # Wait for it to be delivered
      handle.wait(5)

      # Callback should have been called
      expect(@callback_called).to be true
    end
  end

  it "should require a topic" do
    expect {
      producer.produce(
        payload: "payload",
        key:     "key"
     )
    }.to raise_error ArgumentError, "missing keyword: topic"
  end

  it "should produce a message" do
    # Produce a message
    handle = producer.produce(
      topic:   "produce_test_topic",
      payload: "payload",
      key:     "key"
    )

    # Should be pending at first
    expect(handle.pending?).to be true

    # Check delivery handle and report
    report = handle.wait(5)
    expect(handle.pending?).to be false
    expect(report).not_to be_nil
    expect(report.partition).to eq 1
    expect(report.offset).to be >= 0

    # Close producer
    producer.close

    # Consume message and verify it's content
    message = wait_for_message(
      topic: "produce_test_topic",
      delivery_report: report
    )
    expect(message.partition).to eq 1
    expect(message.payload).to eq "payload"
    expect(message.key).to eq "key"
    # Since api.version.request is on by default we will get
    # the message creation timestamp if it's not set.
    expect(message.timestamp).to be_within(5).of(Time.now)
  end

  it "should produce a message with a specified partition" do
    # Produce a message
    handle = producer.produce(
      topic:     "produce_test_topic",
      payload:   "payload partition",
      key:       "key partition",
      partition: 1
    )
    report = handle.wait(5)

    # Consume message and verify it's content
    message = wait_for_message(
      topic: "produce_test_topic",
      delivery_report: report
    )
    expect(message.partition).to eq 1
    expect(message.key).to eq "key partition"
  end

  it "should produce a message with utf-8 encoding" do
    handle = producer.produce(
      topic:   "produce_test_topic",
      payload: "Τη γλώσσα μου έδωσαν ελληνική",
      key:     "key utf8"
    )
    report = handle.wait(5)

    # Consume message and verify it's content
    message = wait_for_message(
      topic: "produce_test_topic",
      delivery_report: report
    )

    expect(message.partition).to eq 1
    expect(message.payload.force_encoding("utf-8")).to eq "Τη γλώσσα μου έδωσαν ελληνική"
    expect(message.key).to eq "key utf8"
  end

  context "timestamp" do
    it "should raise a type error if not nil, integer or time" do
      expect {
        producer.produce(
          topic:     "produce_test_topic",
          payload:   "payload timestamp",
          key:       "key timestamp",
          timestamp: "10101010"
        )
      }.to raise_error TypeError
    end

    it "should produce a message with an integer timestamp" do
      handle = producer.produce(
        topic:     "produce_test_topic",
        payload:   "payload timestamp",
        key:       "key timestamp",
        timestamp: 1505069646252
      )
      report = handle.wait(5)

      # Consume message and verify it's content
      message = wait_for_message(
        topic: "produce_test_topic",
        delivery_report: report
      )

      expect(message.partition).to eq 2
      expect(message.key).to eq "key timestamp"
      expect(message.timestamp).to eq Time.at(1505069646, 252_000)
    end

    it "should produce a message with a time timestamp" do
      handle = producer.produce(
        topic:     "produce_test_topic",
        payload:   "payload timestamp",
        key:       "key timestamp",
        timestamp: Time.at(1505069646, 353_000)
      )
      report = handle.wait(5)

      # Consume message and verify it's content
      message = wait_for_message(
        topic: "produce_test_topic",
        delivery_report: report
      )

      expect(message.partition).to eq 2
      expect(message.key).to eq "key timestamp"
      expect(message.timestamp).to eq Time.at(1505069646, 353_000)
    end
  end

  it "should produce a message with nil key" do
    handle = producer.produce(
      topic:   "produce_test_topic",
      payload: "payload no key"
    )
    report = handle.wait(5)

    # Consume message and verify it's content
    message = wait_for_message(
      topic: "produce_test_topic",
      delivery_report: report
    )

    expect(message.key).to be_nil
    expect(message.payload).to eq "payload no key"
  end

  it "should produce a message with nil payload" do
    handle = producer.produce(
      topic: "produce_test_topic",
      key:   "key no payload"
    )
    report = handle.wait(5)

    # Consume message and verify it's content
    message = wait_for_message(
      topic: "produce_test_topic",
      delivery_report: report
    )

    expect(message.key).to eq "key no payload"
    expect(message.payload).to be_nil
  end

  it "should produce message that aren't waited for and not crash" do
    5.times do
      200.times do
        producer.produce(
          topic:   "produce_test_topic",
          payload: "payload not waiting",
          key:     "key not waiting"
        )
      end

      # Allow some time for a GC run
      sleep 1
    end

    # Wait for the delivery notifications
    10.times do
      break if Rdkafka::Producer::DeliveryHandle::REGISTRY.empty?
      sleep 1
    end
  end

# TODO this spec crashes if you create and use the producer before
# forking like so:
#
# @producer = producer
#
# This will be added as part of https://github.com/appsignal/rdkafka-ruby/issues/19
  #it "should produce a message in a forked process" do
  #  # Fork, produce a message, send the report of a pipe and
  #  # wait for it in the main process.

  #  reader, writer = IO.pipe

  #  fork do
  #    reader.close

  #    handle = producer.produce(
  #      topic:   "produce_test_topic",
  #      payload: "payload",
  #      key:     "key"
  #    )

  #    report = handle.wait(5)
  #    producer.close

  #    report_json = JSON.generate(
  #      "partition" => report.partition,
  #      "offset" => report.offset
  #    )

  #    writer.write(report_json)
  #  end

  #  writer.close

  #  report_hash = JSON.parse(reader.read)
  #  report = Rdkafka::Producer::DeliveryReport.new(
  #    report_hash["partition"],
  #    report_hash["offset"]
  #  )

  #  # Consume message and verify it's content
  #  message = wait_for_message(
  #    topic: "produce_test_topic",
  #    delivery_report: report
  #  )
  #  expect(message.partition).to eq 1
  #  expect(message.payload).to eq "payload"
  #  expect(message.key).to eq "key"
  #end

  it "should raise an error when producing fails" do
    expect(Rdkafka::Bindings).to receive(:rd_kafka_producev).and_return(20)

    expect {
      producer.produce(
        topic:   "produce_test_topic",
        key:     "key error"
      )
    }.to raise_error Rdkafka::RdkafkaError
  end

  it "should raise a timeout error when waiting too long" do
    handle = producer.produce(
      topic:   "produce_test_topic",
      payload: "payload timeout",
      key:     "key timeout"
    )
    expect {
      handle.wait(0)
    }.to raise_error Rdkafka::Producer::DeliveryHandle::WaitTimeoutError

    # Waiting a second time should work
    handle.wait(5)
  end
end