# frozen_string_literal: true

require 'spec_helper'
require 'support/recording_logger'

# let these existing styles stand, rather than going in for a deep refactoring
# of these specs.
#
# possible future work: re-enable these one at a time and do the hard work of
# making them right.
#
# rubocop:disable RSpec/ContextWording, RSpec/VerifiedDoubles, RSpec/MessageSpies
# rubocop:disable RSpec/ExpectInHook, RSpec/ExampleLength
describe Mongo::Cluster do
  let(:monitoring) do
    Mongo::Monitoring.new(monitoring: false)
  end

  let(:cluster_with_semaphore) do
    register_cluster(
      described_class.new(
        SpecConfig.instance.addresses,
        monitoring,
        SpecConfig.instance.test_options.merge(
          server_selection_semaphore: Mongo::Semaphore.new
        )
      )
    )
  end

  let(:cluster_without_io) do
    register_cluster(
      described_class.new(
        SpecConfig.instance.addresses,
        monitoring,
        SpecConfig.instance.test_options.merge(monitoring_io: false)
      )
    )
  end

  let(:cluster) { cluster_without_io }

  describe 'initialize' do
    context 'when there are duplicate addresses' do
      let(:addresses) do
        SpecConfig.instance.addresses + SpecConfig.instance.addresses
      end

      let(:cluster_with_dup_addresses) do
        register_cluster(
          described_class.new(addresses, monitoring, SpecConfig.instance.test_options)
        )
      end

      it 'does not raise an exception' do
        expect { cluster_with_dup_addresses }.not_to raise_error
      end
    end

    context 'when topology is load-balanced' do
      require_topology :load_balanced

      it 'emits SDAM events' do
        allow(monitoring).to receive(:succeeded)

        register_cluster(
          described_class.new(
            SpecConfig.instance.addresses,
            monitoring,
            SpecConfig.instance.test_options
          )
        )

        expect(monitoring).to have_received(:succeeded).with(
          Mongo::Monitoring::TOPOLOGY_OPENING, any_args
        )
        expect(monitoring).to have_received(:succeeded).with(
          Mongo::Monitoring::TOPOLOGY_CHANGED, any_args
        ).twice
        expect(monitoring).to have_received(:succeeded).with(
          Mongo::Monitoring::SERVER_OPENING, any_args
        )
        expect(monitoring).to have_received(:succeeded).with(
          Mongo::Monitoring::SERVER_DESCRIPTION_CHANGED, any_args
        )
      end
    end

    context 'when a non-genuine host is detected' do
      before { described_class.new(host_names, monitoring, logger: logger, monitoring_io: false) }

      let(:logger) { RecordingLogger.new }

      shared_examples 'an action that logs' do
        it 'writes a warning to the log' do
          expect(logger.lines).to include(a_string_matching(expected_log_output))
        end
      end

      context 'when CosmosDB is detected' do
        let(:host_names) { %w[ xyz.cosmos.azure.com ] }
        let(:expected_log_output) { %r{https://www.mongodb.com/supportability/cosmosdb} }

        it_behaves_like 'an action that logs'
      end

      context 'when DocumentDB is detected' do
        let(:expected_log_output) { %r{https://www.mongodb.com/supportability/documentdb} }

        context 'with docdb uri' do
          let(:host_names) { [ 'xyz.docdb.amazonaws.com' ] }

          it_behaves_like 'an action that logs'
        end

        context 'with docdb-elastic uri' do
          let(:host_names) { [ 'xyz.docdb-elastic.amazonaws.com' ] }

          it_behaves_like 'an action that logs'
        end
      end
    end
  end

  describe '#==' do
    context 'when the other is a cluster' do
      context 'when the addresses are the same' do
        context 'when the options are the same' do
          let(:other) do
            described_class.new(
              SpecConfig.instance.addresses, monitoring,
              SpecConfig.instance.test_options.merge(monitoring_io: false)
            )
          end

          it 'returns true' do
            expect(cluster_without_io).to eq(other)
          end
        end

        context 'when the options are not the same' do
          let(:other) do
            described_class.new(
              [ '127.0.0.1:27017' ],
              monitoring,
              SpecConfig.instance.test_options.merge(replica_set: 'test', monitoring_io: false)
            )
          end

          it 'returns false' do
            expect(cluster_without_io).not_to eq(other)
          end
        end
      end

      context 'when the addresses are not the same' do
        let(:other) do
          described_class.new(
            [ '127.0.0.1:27999' ],
            monitoring,
            SpecConfig.instance.test_options.merge(monitoring_io: false)
          )
        end

        it 'returns false' do
          expect(cluster_without_io).not_to eq(other)
        end
      end
    end

    context 'when the other is not a cluster' do
      it 'returns false' do
        expect(cluster_without_io).not_to eq('test')
      end
    end
  end

  describe '#has_readable_server?' do
    let(:selector) do
      Mongo::ServerSelector.primary
    end

    it 'delegates to the topology' do
      expect(cluster_without_io.has_readable_server?)
        .to eq(cluster_without_io.topology.has_readable_server?(cluster_without_io))
    end
  end

  describe '#has_writable_server?' do
    it 'delegates to the topology' do
      expect(cluster_without_io.has_writable_server?)
        .to eq(cluster_without_io.topology.has_writable_server?(cluster_without_io))
    end
  end

  describe '#inspect' do
    let(:preference) do
      Mongo::ServerSelector.primary
    end

    it 'displays the cluster seeds and topology' do
      expect(cluster_without_io.inspect).to include('topology')
      expect(cluster_without_io.inspect).to include('servers')
    end
  end

  describe '#replica_set_name' do
    let(:preference) do
      Mongo::ServerSelector.primary
    end

    context 'when the option is provided' do
      let(:cluster) do
        described_class.new(
          [ '127.0.0.1:27017' ],
          monitoring,
          { monitoring_io: false, connect: :replica_set, replica_set: 'testing' }
        )
      end

      it 'returns the name' do
        expect(cluster.replica_set_name).to eq('testing')
      end
    end

    context 'when the option is not provided' do
      let(:cluster) do
        described_class.new(
          [ '127.0.0.1:27017' ],
          monitoring,
          { monitoring_io: false, connect: :direct }
        )
      end

      it 'returns nil' do
        expect(cluster.replica_set_name).to be_nil
      end
    end
  end

  describe '#scan!' do
    let(:preference) do
      Mongo::ServerSelector.primary
    end

    let(:known_servers) do
      cluster.instance_variable_get(:@servers)
    end

    let(:server) { known_servers.first }

    let(:monitor) do
      double('monitor')
    end

    before do
      expect(server).to receive(:monitor).at_least(:once).and_return(monitor)
      expect(monitor).to receive(:scan!)

      # scan! complains that there isn't a monitor on the server, calls summary
      allow(monitor).to receive(:running?)
    end

    it 'returns true' do
      expect(cluster.scan!).to be true
    end
  end

  describe '#servers' do
    let(:cluster) { cluster_with_semaphore }

    context 'when topology is single' do
      before do
        skip 'Topology is not a single server' unless ClusterConfig.instance.single_server?
      end

      context 'when the server is a mongos' do
        require_topology :sharded

        it 'returns the mongos' do
          expect(cluster.servers.size).to eq(1)
        end
      end

      context 'when the server is a replica set member' do
        require_topology :replica_set

        it 'returns the replica set member' do
          expect(cluster.servers.size).to eq(1)
        end
      end
    end

    context 'when the cluster has no servers' do
      let(:servers) do
        []
      end

      before do
        cluster_without_io.instance_variable_set(:@servers, servers)
        cluster_without_io.instance_variable_set(:@topology, topology)
      end

      context 'when topology is Single' do
        let(:topology) do
          Mongo::Cluster::Topology::Single.new({}, monitoring, cluster_without_io)
        end

        it 'returns an empty array' do
          expect(cluster_without_io.servers).to eq([])
        end
      end

      context 'when topology is ReplicaSetNoPrimary' do
        let(:topology) do
          Mongo::Cluster::Topology::ReplicaSetNoPrimary.new({ replica_set_name: 'foo' }, monitoring, cluster_without_io)
        end

        it 'returns an empty array' do
          expect(cluster_without_io.servers).to eq([])
        end
      end

      context 'when topology is Sharded' do
        let(:topology) do
          Mongo::Cluster::Topology::Sharded.new({}, monitoring, cluster_without_io)
        end

        it 'returns an empty array' do
          expect(cluster_without_io.servers).to eq([])
        end
      end

      context 'when topology is Unknown' do
        let(:topology) do
          Mongo::Cluster::Topology::Unknown.new({}, monitoring, cluster_without_io)
        end

        it 'returns an empty array' do
          expect(cluster_without_io.servers).to eq([])
        end
      end
    end
  end

  describe '#add' do
    context 'topology is Sharded' do
      require_topology :sharded

      let(:topology) do
        Mongo::Cluster::Topology::Sharded.new({}, cluster)
      end

      before do
        cluster.add('a')
      end

      it 'creates server with nil last_scan' do
        server = cluster.servers_list.detect do |srv|
          srv.address.seed == 'a'
        end

        expect(server).not_to be_nil

        expect(server.last_scan).to be_nil
        expect(server.last_scan_monotime).to be_nil
      end
    end
  end

  describe '#close' do
    let(:cluster) { cluster_with_semaphore }

    let(:known_servers) do
      cluster.instance_variable_get(:@servers)
    end

    let(:periodic_executor) do
      cluster.instance_variable_get(:@periodic_executor)
    end

    describe 'closing' do
      before do
        expect(known_servers).to all receive(:close).and_call_original
        expect(periodic_executor).to receive(:stop!).and_call_original
      end

      it 'disconnects each server and the cursor reaper and returns nil' do
        expect(cluster.close).to be_nil
      end
    end

    describe 'repeated closing' do
      before do
        expect(known_servers).to all receive(:close).and_call_original
        expect(periodic_executor).to receive(:stop!).and_call_original
      end

      let(:monitoring) { Mongo::Monitoring.new }
      let(:subscriber) { Mrss::EventSubscriber.new }

      it 'publishes server closed event once' do
        monitoring.subscribe(Mongo::Monitoring::SERVER_CLOSED, subscriber)
        expect(cluster.close).to be_nil
        expect(subscriber.first_event('server_closed_event')).not_to be_nil
        subscriber.succeeded_events.clear
        expect(cluster.close).to be_nil
        expect(subscriber.first_event('server_closed_event')).to be_nil
      end
    end
  end

  describe '#reconnect!' do
    let(:cluster) { cluster_with_semaphore }

    let(:periodic_executor) do
      cluster.instance_variable_get(:@periodic_executor)
    end

    before do
      cluster.next_primary
      expect(cluster.servers).to all receive(:reconnect!).and_call_original
      expect(periodic_executor).to receive(:restart!).and_call_original
    end

    it 'reconnects each server and the cursor reaper and returns true' do
      expect(cluster.reconnect!).to be(true)
    end
  end

  describe '#remove' do
    let(:address_a) { Mongo::Address.new('127.0.0.1:25555') }
    let(:address_b) { Mongo::Address.new('127.0.0.1:25556') }
    let(:monitoring) { Mongo::Monitoring.new(monitoring: false) }

    let(:server_a) do
      register_server(
        Mongo::Server.new(
          address_a,
          cluster,
          monitoring,
          Mongo::Event::Listeners.new,
          monitor: false
        )
      )
    end

    let(:server_b) do
      register_server(
        Mongo::Server.new(
          address_b,
          cluster,
          monitoring,
          Mongo::Event::Listeners.new,
          monitor: false
        )
      )
    end

    let(:servers) do
      [ server_a, server_b ]
    end

    let(:addresses) do
      [ address_a, address_b ]
    end

    before do
      cluster.instance_variable_set(:@servers, servers)
      cluster.remove('127.0.0.1:25555')
    end

    it 'removes the host from the list of servers' do
      expect(cluster.instance_variable_get(:@servers)).to eq([ server_b ])
    end

    it 'removes the host from the list of addresses' do
      expect(cluster.addresses).to eq([ address_b ])
    end
  end

  describe '#next_primary' do
    let(:cluster) do
      # We use next_primary to wait for server selection, and this is
      # also the method we are testing.
      authorized_client.tap { |client| client.cluster.next_primary }.cluster
    end

    let(:primary_candidates) do
      if cluster.single? || cluster.load_balanced? || cluster.sharded?
        cluster.servers
      else
        cluster.servers.select(&:primary?)
      end
    end

    it 'always returns the primary, mongos, or standalone' do
      expect(primary_candidates).to include(cluster.next_primary)
    end
  end

  describe '#app_metadata' do
    it 'returns an AppMetadata object' do
      expect(cluster_without_io.app_metadata).to be_a(Mongo::Server::AppMetadata)
    end

    context 'when the client has an app_name set' do
      let(:cluster) do
        authorized_client.with(app_name: 'cluster_test', monitoring_io: false).cluster
      end

      it 'constructs an AppMetadata object with the app_name' do
        expect(cluster.app_metadata.client_document[:application]).to eq('name' => 'cluster_test')
      end
    end

    context 'when the client does not have an app_name set' do
      let(:cluster) do
        authorized_client.cluster
      end

      it 'constructs an AppMetadata object with no app_name' do
        expect(cluster.app_metadata.client_document[:application]).to be_nil
      end
    end
  end

  describe '#cluster_time' do
    let(:operation) do
      client.command(ping: 1)
    end

    let(:operation_with_session) do
      client.command({ ping: 1 }, session: session)
    end

    let(:second_operation) do
      client.command({ ping: 1 }, session: session)
    end

    it_behaves_like 'an operation updating cluster time'
  end

  describe '#update_cluster_time' do
    let(:cluster) do
      described_class.new(
        SpecConfig.instance.addresses, monitoring,
        SpecConfig.instance.test_options.merge(
          heartbeat_frequency: 1000,
          monitoring_io: false
        )
      )
    end

    let(:result) do
      double('result', cluster_time: cluster_time_doc)
    end

    context 'when the cluster_time variable is nil' do
      before do
        cluster.instance_variable_set(:@cluster_time, nil)
        cluster.update_cluster_time(result)
      end

      context 'when the cluster time received is nil' do
        let(:cluster_time_doc) do
          nil
        end

        it 'does not set the cluster_time variable' do
          expect(cluster.cluster_time).to be_nil
        end
      end

      context 'when the cluster time received is not nil' do
        let(:cluster_time_doc) do
          BSON::Document.new(Mongo::Cluster::CLUSTER_TIME => BSON::Timestamp.new(1, 1))
        end

        it 'sets the cluster_time variable to the cluster time doc' do
          expect(cluster.cluster_time).to eq(cluster_time_doc)
        end
      end
    end

    context 'when the cluster_time variable has a value' do
      before do
        cluster.instance_variable_set(
          :@cluster_time,
          Mongo::ClusterTime.new(
            Mongo::Cluster::CLUSTER_TIME => BSON::Timestamp.new(1, 1)
          )
        )
        cluster.update_cluster_time(result)
      end

      context 'when the cluster time received is nil' do
        let(:cluster_time_doc) do
          nil
        end

        it 'does not update the cluster_time variable' do
          expect(cluster.cluster_time).to eq(
            BSON::Document.new(
              Mongo::Cluster::CLUSTER_TIME => BSON::Timestamp.new(1, 1)
            )
          )
        end
      end

      context 'when the cluster time received is not nil' do
        context 'when the cluster time received is greater than the cluster_time variable' do
          let(:cluster_time_doc) do
            BSON::Document.new(Mongo::Cluster::CLUSTER_TIME => BSON::Timestamp.new(1, 2))
          end

          it 'sets the cluster_time variable to the cluster time' do
            expect(cluster.cluster_time).to eq(cluster_time_doc)
          end
        end

        context 'when the cluster time received is less than the cluster_time variable' do
          let(:cluster_time_doc) do
            BSON::Document.new(Mongo::Cluster::CLUSTER_TIME => BSON::Timestamp.new(0, 1))
          end

          it 'does not set the cluster_time variable to the cluster time' do
            expect(cluster.cluster_time).to eq(
              BSON::Document.new(
                Mongo::Cluster::CLUSTER_TIME => BSON::Timestamp.new(1, 1)
              )
            )
          end
        end

        context 'when the cluster time received is equal to the cluster_time variable' do
          let(:cluster_time_doc) do
            BSON::Document.new(Mongo::Cluster::CLUSTER_TIME => BSON::Timestamp.new(1, 1))
          end

          it 'does not change the cluster_time variable' do
            expect(cluster.cluster_time).to eq(
              BSON::Document.new(
                Mongo::Cluster::CLUSTER_TIME => BSON::Timestamp.new(1, 1)
              )
            )
          end
        end
      end
    end
  end

  describe '#validate_session_support!' do
    shared_examples 'supports sessions' do
      it 'supports sessions' do
        expect { cluster.validate_session_support! }
          .not_to raise_error
      end
    end

    shared_examples 'does not support sessions' do
      it 'does not support sessions' do
        expect { cluster.validate_session_support! }
          .to raise_error(Mongo::Error::SessionsNotSupported)
      end
    end

    context 'in server < 3.6' do
      max_server_version '3.4'

      let(:cluster) { client.cluster }

      context 'in single topology' do
        require_topology :single

        let(:client) { ClientRegistry.instance.global_client('authorized') }

        it_behaves_like 'does not support sessions'
      end

      context 'in single topology with replica set name set' do
        require_topology :replica_set

        let(:client) do
          new_local_client(
            [ SpecConfig.instance.addresses.first ],
            SpecConfig.instance.test_options.merge(
              connect: :direct,
              replica_set: ClusterConfig.instance.replica_set_name
            )
          )
        end

        it_behaves_like 'does not support sessions'
      end

      context 'in replica set topology' do
        require_topology :replica_set

        let(:client) { ClientRegistry.instance.global_client('authorized') }

        it_behaves_like 'does not support sessions'
      end

      context 'in sharded topology' do
        require_topology :sharded

        let(:client) { ClientRegistry.instance.global_client('authorized') }

        it_behaves_like 'does not support sessions'
      end
    end

    context 'in server 3.6+' do
      min_server_fcv '3.6'

      let(:cluster) { client.cluster }

      context 'in single topology' do
        require_topology :single

        let(:client) { ClientRegistry.instance.global_client('authorized') }

        # Contrary to the session spec, 3.6 and 4.0 standalone servers
        # report a logical session timeout and thus are considered to
        # support sessions.
        it_behaves_like 'supports sessions'
      end

      context 'in single topology with replica set name set' do
        require_topology :replica_set

        let(:client) do
          new_local_client(
            [ SpecConfig.instance.addresses.first ],
            SpecConfig.instance.test_options.merge(
              connect: :direct,
              replica_set: ClusterConfig.instance.replica_set_name
            )
          )
        end

        it_behaves_like 'supports sessions'
      end

      context 'in replica set topology' do
        require_topology :replica_set

        let(:client) { ClientRegistry.instance.global_client('authorized') }

        it_behaves_like 'supports sessions'
      end

      context 'in sharded topology' do
        require_topology :sharded

        let(:client) { ClientRegistry.instance.global_client('authorized') }

        it_behaves_like 'supports sessions'
      end
    end
  end

  { max_read_retries: 1, read_retry_interval: 5 }.each do |opt, default|
    describe "##{opt}" do
      let(:client_options) { {} }

      let(:client) do
        new_local_client_nmio([ '127.0.0.1:27017' ], client_options)
      end

      let(:cluster) do
        client.cluster
      end

      it "defaults to #{default}" do
        expect(default).not_to be_nil
        expect(client.options[opt]).to be_nil
        expect(cluster.send(opt)).to eq(default)
      end

      context 'specified on client' do
        let(:client_options) { { opt => 2 } }

        it 'inherits from client' do
          expect(client.options[opt]).to eq(2)
          expect(cluster.send(opt)).to eq(2)
        end
      end
    end
  end

  describe '#summary' do
    let(:default_address) { SpecConfig.instance.addresses.first }

    context 'cluster has unknown servers' do
      # Servers are never unknown in load-balanced topology.
      require_topology :single, :replica_set, :sharded

      it 'includes unknown servers' do
        expect(cluster.servers_list).to all be_unknown
        expect(cluster.summary).to match(/Server address=#{default_address}/)
      end
    end

    context 'cluster has known servers' do
      let(:client) { ClientRegistry.instance.global_client('authorized') }
      let(:cluster) { client.cluster }

      before do
        wait_for_all_servers(cluster)
      end

      it 'includes known servers' do
        cluster.servers_list.each do |server|
          expect(server).not_to be_unknown
        end

        expect(cluster.summary).to match(/Server address=#{default_address}/)
      end
    end
  end
end
# rubocop:enable RSpec/ContextWording, RSpec/VerifiedDoubles, RSpec/MessageSpies
# rubocop:enable RSpec/ExpectInHook, RSpec/ExampleLength