{.used.}

import
  std/[options, sequtils, times],
  stew/shims/net as stewNet,
  testutils/unittests,
  chronos,
  json_rpc/rpcserver,
  json_rpc/rpcclient,
  eth/keys,
  eth/common/eth_types,
  libp2p/[builders, switch, multiaddress],
  libp2p/protobuf/minprotobuf,
  libp2p/stream/[bufferstream, connection],
  libp2p/crypto/crypto,
  libp2p/protocols/pubsub/pubsub,
  libp2p/protocols/pubsub/rpc/message,
  libp2p/peerid
import
  ../../waku/common/sqlite,
  ../../waku/v2/node/peer_manager/peer_manager,
  ../../waku/v2/node/peer_manager/peer_store/waku_peer_storage,
  ../../waku/v2/waku_node,
  ../../waku/v2/waku_relay,
  ../../waku/v2/waku_store,
  ../../waku/v2/waku_filter,
  ../../waku/v2/waku_lightpush,
  ../../waku/v2/waku_peer_exchange,
  ./testlib/common,
  ./testlib/testutils,
  ./testlib/wakucore,
  ./testlib/wakunode

procSuite "Peer Manager":
  asyncTest "connectRelay() works":
    # Create 2 nodes
    let nodes = toSeq(0..<2).mapIt(newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0)))
    await allFutures(nodes.mapIt(it.start()))

    let connOk = await nodes[0].peerManager.connectRelay(nodes[1].peerInfo.toRemotePeerInfo())
    check:
      connOk == true
      nodes[0].peerManager.peerStore.peers().anyIt(it.peerId == nodes[1].peerInfo.peerId)
      nodes[0].peerManager.peerStore.connectedness(nodes[1].peerInfo.peerId) == Connectedness.Connected

  asyncTest "dialPeer() works":
    # Create 2 nodes
    let nodes = toSeq(0..<2).mapIt(newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0)))

    await allFutures(nodes.mapIt(it.start()))
    await allFutures(nodes.mapIt(it.mountRelay()))
    await allFutures(nodes.mapIt(it.mountFilter()))

    # Dial node2 from node1
    let conn = await nodes[0].peerManager.dialPeer(nodes[1].peerInfo.toRemotePeerInfo(), WakuFilterCodec)
    # Check connection
    check:
      conn.isSome()
      conn.get.activity
      conn.get.peerId == nodes[1].peerInfo.peerId

    # Check that node2 is being managed in node1
    check:
      nodes[0].peerManager.peerStore.peers().anyIt(it.peerId == nodes[1].peerInfo.peerId)

    # Check connectedness
    check:
      nodes[0].peerManager.peerStore.connectedness(nodes[1].peerInfo.peerId) == Connectedness.Connected

    await allFutures(nodes.mapIt(it.stop()))

  asyncTest "dialPeer() fails gracefully":
    # Create 2 nodes and start them
    let nodes = toSeq(0..<2).mapIt(newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0)))
    await allFutures(nodes.mapIt(it.start()))
    await allFutures(nodes.mapIt(it.mountRelay()))

    let nonExistentPeerRes = parsePeerInfo("/ip4/0.0.0.0/tcp/1000/p2p/16Uiu2HAmL5okWopX7NqZWBUKVqW8iUxCEmd5GMHLVPwCgzYzQv3e")
    require nonExistentPeerRes.isOk()

    let nonExistentPeer = nonExistentPeerRes.value

    # Dial non-existent peer from node1
    let conn1 = await nodes[0].peerManager.dialPeer(nonExistentPeer, WakuFilterCodec)
    check:
      conn1.isNone()

    # Dial peer not supporting given protocol
    let conn2 = await nodes[0].peerManager.dialPeer(nodes[1].peerInfo.toRemotePeerInfo(), WakuFilterCodec)
    check:
      conn2.isNone()

    await allFutures(nodes.mapIt(it.stop()))

  asyncTest "Adding, selecting and filtering peers work":
    let
      node = newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0))

      # Create filter peer
      filterLoc = MultiAddress.init("/ip4/127.0.0.1/tcp/0").tryGet()
      filterPeer = PeerInfo.new(generateEcdsaKey(), @[filterLoc])
      # Create store peer
      storeLoc = MultiAddress.init("/ip4/127.0.0.3/tcp/4").tryGet()
      storePeer = PeerInfo.new(generateEcdsaKey(), @[storeLoc])

    await node.start()

    await node.mountFilterClient()
    node.mountStoreClient()

    node.peerManager.addServicePeer(storePeer.toRemotePeerInfo(), WakuStoreCodec)
    node.peerManager.addServicePeer(filterPeer.toRemotePeerInfo(), WakuFilterCodec)

    # Check peers were successfully added to peer manager
    check:
      node.peerManager.peerStore.peers().len == 2
      node.peerManager.peerStore.peers(WakuFilterCodec).allIt(it.peerId == filterPeer.peerId and
                                                              it.addrs.contains(filterLoc) and
                                                              it.protocols.contains(WakuFilterCodec))
      node.peerManager.peerStore.peers(WakuStoreCodec).allIt(it.peerId == storePeer.peerId and
                                                             it.addrs.contains(storeLoc) and
                                                             it.protocols.contains(WakuStoreCodec))

    await node.stop()


  asyncTest "Peer manager keeps track of connections":
    # Create 2 nodes
    let nodes = toSeq(0..<2).mapIt(newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0)))

    await allFutures(nodes.mapIt(it.start()))
    await allFutures(nodes.mapIt(it.mountRelay()))

    # Test default connectedness for new peers
    nodes[0].peerManager.addPeer(nodes[1].peerInfo.toRemotePeerInfo())
    check:
      # No information about node2's connectedness
      nodes[0].peerManager.peerStore.connectedness(nodes[1].peerInfo.peerId) == NotConnected

    # Failed connection
    let nonExistentPeerRes = parsePeerInfo("/ip4/0.0.0.0/tcp/1000/p2p/16Uiu2HAmL5okWopX7NqZWBUKVqW8iUxCEmd5GMHLVPwCgzYzQv3e")
    require:
      nonExistentPeerRes.isOk()

    let nonExistentPeer = nonExistentPeerRes.value
    require:
      (await nodes[0].peerManager.connectRelay(nonExistentPeer)) == false

    check:
      # Cannot connect to node2
      nodes[0].peerManager.peerStore.connectedness(nonExistentPeer.peerId) == CannotConnect

    # Successful connection
    require:
      (await nodes[0].peerManager.connectRelay(nodes[1].peerInfo.toRemotePeerInfo())) == true
    check:
      # Currently connected to node2
      nodes[0].peerManager.peerStore.connectedness(nodes[1].peerInfo.peerId) == Connected

    # Stop node. Gracefully disconnect from all peers.
    await nodes[0].stop()
    check:
      # Not currently connected to node2, but had recent, successful connection.
      nodes[0].peerManager.peerStore.connectedness(nodes[1].peerInfo.peerId) == CanConnect

    await nodes[1].stop()

  asyncTest "Peer manager updates failed peers correctly":
    # Create 2 nodes
    let nodes = toSeq(0..<2).mapIt(newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0)))

    await allFutures(nodes.mapIt(it.start()))
    await allFutures(nodes.mapIt(it.mountRelay()))

    let nonExistentPeerRes = parsePeerInfo("/ip4/0.0.0.0/tcp/1000/p2p/16Uiu2HAmL5okWopX7NqZWBUKVqW8iUxCEmd5GMHLVPwCgzYzQv3e")
    require nonExistentPeerRes.isOk()

    let nonExistentPeer = nonExistentPeerRes.value

    nodes[0].peerManager.addPeer(nonExistentPeer)

    # Set a low backoff to speed up test: 2, 4, 8, 16
    nodes[0].peerManager.initialBackoffInSec = 2
    nodes[0].peerManager.backoffFactor = 2

    # try to connect to peer that doesnt exist
    let conn1Ok = await nodes[0].peerManager.connectRelay(nonExistentPeer)
    check:
      # Cannot connect to node2
      nodes[0].peerManager.peerStore.connectedness(nonExistentPeer.peerId) == CannotConnect
      nodes[0].peerManager.peerStore[ConnectionBook][nonExistentPeer.peerId] == CannotConnect
      nodes[0].peerManager.peerStore[NumberFailedConnBook][nonExistentPeer.peerId] == 1

      # Connection attempt failed
      conn1Ok == false

      # Right after failing there is a backoff period
      nodes[0].peerManager.canBeConnected(nonExistentPeer.peerId) == false

    # We wait the first backoff period
    await sleepAsync(chronos.milliseconds(2100))

    # And backoff period is over
    check:
      nodes[0].peerManager.canBeConnected(nodes[1].peerInfo.peerId) == true

    # After a successful connection, the number of failed connections is reset
    nodes[0].peerManager.peerStore[NumberFailedConnBook][nodes[1].peerInfo.peerId] = 4
    let conn2Ok = await nodes[0].peerManager.connectRelay(nodes[1].peerInfo.toRemotePeerInfo())
    check:
      conn2Ok == true
      nodes[0].peerManager.peerStore[NumberFailedConnBook][nodes[1].peerInfo.peerId] == 0

    await allFutures(nodes.mapIt(it.stop()))

  asyncTest "Peer manager can use persistent storage and survive restarts":
    let
      database = SqliteDatabase.new(":memory:")[]
      storage = WakuPeerStorage.new(database)[]
      node1 = newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0), peerStorage = storage)
      node2 = newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0))
      peerInfo2 = node2.switch.peerInfo

    await node1.start()
    await node2.start()

    await node1.mountRelay()
    await node2.mountRelay()

    require:
      (await node1.peerManager.connectRelay(peerInfo2.toRemotePeerInfo())) == true
    check:
      # Currently connected to node2
      node1.peerManager.peerStore.peers().len == 1
      node1.peerManager.peerStore.peers().anyIt(it.peerId == peerInfo2.peerId)
      node1.peerManager.peerStore.connectedness(peerInfo2.peerId) == Connected

    # Simulate restart by initialising a new node using the same storage
    let
      node3 = newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0), peerStorage = storage)

    await node3.start()
    check:
      # Node2 has been loaded after "restart", but we have not yet reconnected
      node3.peerManager.peerStore.peers().len == 1
      node3.peerManager.peerStore.peers().anyIt(it.peerId == peerInfo2.peerId)
      node3.peerManager.peerStore.connectedness(peerInfo2.peerId) == NotConnected

    await node3.mountRelay()
    await node3.peerManager.connectToRelayPeers()

    check:
      # Reconnected to node2 after "restart"
      node3.peerManager.peerStore.peers().len == 1
      node3.peerManager.peerStore.peers().anyIt(it.peerId == peerInfo2.peerId)
      node3.peerManager.peerStore.connectedness(peerInfo2.peerId) == Connected

    await allFutures([node1.stop(), node2.stop(), node3.stop()])

  # TODO: nwaku/issues/1377
  xasyncTest "Peer manager support multiple protocol IDs when reconnecting to peers":
    let
      database = SqliteDatabase.new(":memory:")[]
      storage = WakuPeerStorage.new(database)[]
      node1 = newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0), peerStorage = storage)
      node2 = newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0))
      peerInfo2 = node2.switch.peerInfo
      betaCodec = "/vac/waku/relay/2.0.0-beta2"
      stableCodec = "/vac/waku/relay/2.0.0"

    await node1.start()
    await node2.start()

    await node1.mountRelay()
    node1.wakuRelay.codec = betaCodec
    await node2.mountRelay()
    node2.wakuRelay.codec = betaCodec

    require:
      (await node1.peerManager.connectRelay(peerInfo2.toRemotePeerInfo())) == true
    check:
      # Currently connected to node2
      node1.peerManager.peerStore.peers().len == 1
      node1.peerManager.peerStore.peers().anyIt(it.peerId == peerInfo2.peerId)
      node1.peerManager.peerStore.peers().anyIt(it.protocols.contains(node2.wakuRelay.codec))
      node1.peerManager.peerStore.connectedness(peerInfo2.peerId) == Connected

    # Simulate restart by initialising a new node using the same storage
    let
      node3 = newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0), peerStorage = storage)

    await node3.mountRelay()
    node3.wakuRelay.codec = stableCodec
    check:
      # Node 2 and 3 have differing codecs
      node2.wakuRelay.codec == betaCodec
      node3.wakuRelay.codec == stableCodec
      # Node2 has been loaded after "restart", but we have not yet reconnected
      node3.peerManager.peerStore.peers().len == 1
      node3.peerManager.peerStore.peers().anyIt(it.peerId == peerInfo2.peerId)
      node3.peerManager.peerStore.peers().anyIt(it.protocols.contains(betaCodec))
      node3.peerManager.peerStore.connectedness(peerInfo2.peerId) == NotConnected

    await node3.start() # This should trigger a reconnect

    check:
      # Reconnected to node2 after "restart"
      node3.peerManager.peerStore.peers().len == 1
      node3.peerManager.peerStore.peers().anyIt(it.peerId == peerInfo2.peerId)
      node3.peerManager.peerStore.peers().anyIt(it.protocols.contains(betaCodec))
      node3.peerManager.peerStore.peers().anyIt(it.protocols.contains(stableCodec))
      node3.peerManager.peerStore.connectedness(peerInfo2.peerId) == Connected

    await allFutures([node1.stop(), node2.stop(), node3.stop()])

  asyncTest "Peer manager connects to all peers supporting a given protocol":
    # Create 4 nodes
    let nodes = toSeq(0..<4).mapIt(newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0)))

    # Start them
    await allFutures(nodes.mapIt(it.start()))
    await allFutures(nodes.mapIt(it.mountRelay()))

    # Get all peer infos
    let peerInfos = nodes.mapIt(it.switch.peerInfo.toRemotePeerInfo())

    # Add all peers (but self) to node 0
    nodes[0].peerManager.addPeer(peerInfos[1])
    nodes[0].peerManager.addPeer(peerInfos[2])
    nodes[0].peerManager.addPeer(peerInfos[3])

    # Connect to relay peers
    await nodes[0].peerManager.connectToRelayPeers()

    check:
      # Peerstore track all three peers
      nodes[0].peerManager.peerStore.peers().len == 3

      # All peer ids are correct
      nodes[0].peerManager.peerStore.peers().anyIt(it.peerId == nodes[1].switch.peerInfo.peerId)
      nodes[0].peerManager.peerStore.peers().anyIt(it.peerId == nodes[2].switch.peerInfo.peerId)
      nodes[0].peerManager.peerStore.peers().anyIt(it.peerId == nodes[3].switch.peerInfo.peerId)

      # All peers support the relay protocol
      nodes[0].peerManager.peerStore[ProtoBook][nodes[1].switch.peerInfo.peerId].contains(WakuRelayCodec)
      nodes[0].peerManager.peerStore[ProtoBook][nodes[2].switch.peerInfo.peerId].contains(WakuRelayCodec)
      nodes[0].peerManager.peerStore[ProtoBook][nodes[3].switch.peerInfo.peerId].contains(WakuRelayCodec)

      # All peers are connected
      nodes[0].peerManager.peerStore[ConnectionBook][nodes[1].switch.peerInfo.peerId] == Connected
      nodes[0].peerManager.peerStore[ConnectionBook][nodes[2].switch.peerInfo.peerId] == Connected
      nodes[0].peerManager.peerStore[ConnectionBook][nodes[3].switch.peerInfo.peerId] == Connected

    await allFutures(nodes.mapIt(it.stop()))

  asyncTest "Peer store keeps track of incoming connections":
    # Create 4 nodes
    let nodes = toSeq(0..<4).mapIt(newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0)))

    # Start them
    await allFutures(nodes.mapIt(it.start()))
    await allFutures(nodes.mapIt(it.mountRelay()))

    # Get all peer infos
    let peerInfos = nodes.mapIt(it.switch.peerInfo.toRemotePeerInfo())

    # all nodes connect to peer 0
    require:
      (await nodes[1].peerManager.connectRelay(peerInfos[0])) == true
      (await nodes[2].peerManager.connectRelay(peerInfos[0])) == true
      (await nodes[3].peerManager.connectRelay(peerInfos[0])) == true

    check:
      # Peerstore track all three peers
      nodes[0].peerManager.peerStore.peers().len == 3

      # Inbound/Outbound number of peers match
      nodes[0].peerManager.peerStore.getPeersByDirection(Inbound).len == 3
      nodes[0].peerManager.peerStore.getPeersByDirection(Outbound).len == 0
      nodes[1].peerManager.peerStore.getPeersByDirection(Inbound).len == 0
      nodes[1].peerManager.peerStore.getPeersByDirection(Outbound).len == 1
      nodes[2].peerManager.peerStore.getPeersByDirection(Inbound).len == 0
      nodes[2].peerManager.peerStore.getPeersByDirection(Outbound).len == 1
      nodes[3].peerManager.peerStore.getPeersByDirection(Inbound).len == 0
      nodes[3].peerManager.peerStore.getPeersByDirection(Outbound).len == 1

      # All peer ids are correct
      nodes[0].peerManager.peerStore.peers().anyIt(it.peerId == nodes[1].switch.peerInfo.peerId)
      nodes[0].peerManager.peerStore.peers().anyIt(it.peerId == nodes[2].switch.peerInfo.peerId)
      nodes[0].peerManager.peerStore.peers().anyIt(it.peerId == nodes[3].switch.peerInfo.peerId)

      # All peers support the relay protocol
      nodes[0].peerManager.peerStore[ProtoBook][nodes[1].switch.peerInfo.peerId].contains(WakuRelayCodec)
      nodes[0].peerManager.peerStore[ProtoBook][nodes[2].switch.peerInfo.peerId].contains(WakuRelayCodec)
      nodes[0].peerManager.peerStore[ProtoBook][nodes[3].switch.peerInfo.peerId].contains(WakuRelayCodec)

      # All peers are connected
      nodes[0].peerManager.peerStore[ConnectionBook][nodes[1].switch.peerInfo.peerId] == Connected
      nodes[0].peerManager.peerStore[ConnectionBook][nodes[2].switch.peerInfo.peerId] == Connected
      nodes[0].peerManager.peerStore[ConnectionBook][nodes[3].switch.peerInfo.peerId] == Connected

      # All peers are Inbound in peer 0
      nodes[0].peerManager.peerStore[DirectionBook][nodes[1].switch.peerInfo.peerId] == Inbound
      nodes[0].peerManager.peerStore[DirectionBook][nodes[2].switch.peerInfo.peerId] == Inbound
      nodes[0].peerManager.peerStore[DirectionBook][nodes[3].switch.peerInfo.peerId] == Inbound

      # All peers have an Outbound connection with peer 0
      nodes[1].peerManager.peerStore[DirectionBook][nodes[0].switch.peerInfo.peerId] == Outbound
      nodes[2].peerManager.peerStore[DirectionBook][nodes[0].switch.peerInfo.peerId] == Outbound
      nodes[3].peerManager.peerStore[DirectionBook][nodes[0].switch.peerInfo.peerId] == Outbound

    await allFutures(nodes.mapIt(it.stop()))

  asyncTest "Peer store addServicePeer() stores service peers":
    # Valid peer id missing the last digit
    let basePeerId = "16Uiu2HAm7QGEZKujdSbbo1aaQyfDPQ6Bw3ybQnj6fruH5Dxwd7D"

    let
      node = newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0))
      peers = toSeq(1..5)
                .mapIt(
                    parsePeerInfo("/ip4/0.0.0.0/tcp/30300/p2p/" & basePeerId & $it)
                )
                .filterIt(it.isOk())
                .mapIt(it.value)

    require:
      peers.len == 5

    # service peers
    node.peerManager.addServicePeer(peers[0], WakuStoreCodec)
    node.peerManager.addServicePeer(peers[1], WakuFilterCodec)
    node.peerManager.addServicePeer(peers[2], WakuLightPushCodec)
    node.peerManager.addServicePeer(peers[3], WakuPeerExchangeCodec)

    # relay peers (should not be added)
    node.peerManager.addServicePeer(peers[4], WakuRelayCodec)

    # all peers are stored in the peerstore
    check:
      node.peerManager.peerStore.peers().anyIt(it.peerId == peers[0].peerId)
      node.peerManager.peerStore.peers().anyIt(it.peerId == peers[1].peerId)
      node.peerManager.peerStore.peers().anyIt(it.peerId == peers[2].peerId)
      node.peerManager.peerStore.peers().anyIt(it.peerId == peers[3].peerId)

      # but the relay peer is not
      node.peerManager.peerStore.peers().anyIt(it.peerId == peers[4].peerId) == false

    # all service peers are added to its service slot
    check:
      node.peerManager.serviceSlots[WakuStoreCodec].peerId == peers[0].peerId
      node.peerManager.serviceSlots[WakuFilterCodec].peerId == peers[1].peerId
      node.peerManager.serviceSlots[WakuLightPushCodec].peerId == peers[2].peerId
      node.peerManager.serviceSlots[WakuPeerExchangeCodec].peerId == peers[3].peerId

      # but the relay peer is not
      node.peerManager.serviceSlots.hasKey(WakuRelayCodec) == false

  asyncTest "getNumConnections() returns expected number of connections per protocol":
    # Create 4 nodes
    let nodes = toSeq(0..<4).mapIt(newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0)))

    # Start them with relay + filter
    await allFutures(nodes.mapIt(it.start()))
    await allFutures(nodes.mapIt(it.mountRelay()))
    await allFutures(nodes.mapIt(it.mountFilter()))

    let pInfos = nodes.mapIt(it.switch.peerInfo.toRemotePeerInfo())

    # create some connections/streams
    require:
      # some relay connections
      (await nodes[0].peerManager.connectRelay(pInfos[1])) == true
      (await nodes[0].peerManager.connectRelay(pInfos[2])) == true
      (await nodes[1].peerManager.connectRelay(pInfos[2])) == true

      (await nodes[0].peerManager.dialPeer(pInfos[1], WakuFilterCodec)).isSome() == true
      (await nodes[0].peerManager.dialPeer(pInfos[2], WakuFilterCodec)).isSome() == true

      # isolated dial creates a relay conn under the hood (libp2p behaviour)
      (await nodes[2].peerManager.dialPeer(pInfos[3], WakuFilterCodec)).isSome() == true


    # assert physical connections
    check:
      nodes[0].peerManager.getNumConnections(Direction.In, WakuRelayCodec) == 0
      nodes[0].peerManager.getNumConnections(Direction.Out, WakuRelayCodec) == 2
      nodes[0].peerManager.getNumConnections(Direction.In, WakuFilterCodec) == 0
      nodes[0].peerManager.getNumConnections(Direction.Out, WakuFilterCodec) == 2

      nodes[1].peerManager.getNumConnections(Direction.In, WakuRelayCodec) == 1
      nodes[1].peerManager.getNumConnections(Direction.Out, WakuRelayCodec) == 1
      nodes[1].peerManager.getNumConnections(Direction.In, WakuFilterCodec) == 1
      nodes[1].peerManager.getNumConnections(Direction.Out, WakuFilterCodec) == 0

      nodes[2].peerManager.getNumConnections(Direction.In, WakuRelayCodec) == 2
      nodes[2].peerManager.getNumConnections(Direction.Out, WakuRelayCodec) == 1
      nodes[2].peerManager.getNumConnections(Direction.In, WakuFilterCodec) == 1
      nodes[2].peerManager.getNumConnections(Direction.Out, WakuFilterCodec) == 1

      nodes[3].peerManager.getNumConnections(Direction.In, WakuRelayCodec) == 1
      nodes[3].peerManager.getNumConnections(Direction.Out, WakuRelayCodec) == 0
      nodes[3].peerManager.getNumConnections(Direction.In, WakuFilterCodec) == 1
      nodes[3].peerManager.getNumConnections(Direction.Out, WakuFilterCodec) == 0

  asyncTest "getNumStreams() returns expected number of connections per protocol":
    # Create 2 nodes
    let nodes = toSeq(0..<2).mapIt(newTestWakuNode(generateSecp256k1Key(), ValidIpAddress.init("0.0.0.0"), Port(0)))

    # Start them with relay + filter
    await allFutures(nodes.mapIt(it.start()))
    await allFutures(nodes.mapIt(it.mountRelay()))
    await allFutures(nodes.mapIt(it.mountFilter()))

    let pInfos = nodes.mapIt(it.switch.peerInfo.toRemotePeerInfo())

    require:
      # multiple streams are multiplexed over a single connection.
      # note that a relay connection is created under the hood when dialing a peer (libp2p behaviour)
      (await nodes[0].peerManager.dialPeer(pInfos[1], WakuFilterCodec)).isSome() == true
      (await nodes[0].peerManager.dialPeer(pInfos[1], WakuFilterCodec)).isSome() == true
      (await nodes[0].peerManager.dialPeer(pInfos[1], WakuFilterCodec)).isSome() == true
      (await nodes[0].peerManager.dialPeer(pInfos[1], WakuFilterCodec)).isSome() == true

    check:
      nodes[0].peerManager.getNumStreams(Direction.In, WakuRelayCodec) == 1
      nodes[0].peerManager.getNumStreams(Direction.Out, WakuRelayCodec) == 1
      nodes[0].peerManager.getNumStreams(Direction.In, WakuFilterCodec) == 0
      nodes[0].peerManager.getNumStreams(Direction.Out, WakuFilterCodec) == 4

      nodes[1].peerManager.getNumStreams(Direction.In, WakuRelayCodec) == 1
      nodes[1].peerManager.getNumStreams(Direction.Out, WakuRelayCodec) == 1
      nodes[1].peerManager.getNumStreams(Direction.In, WakuFilterCodec) == 4
      nodes[1].peerManager.getNumStreams(Direction.Out, WakuFilterCodec) == 0

  test "selectPeer() returns the correct peer":
    # Valid peer id missing the last digit
    let basePeerId = "16Uiu2HAm7QGEZKujdSbbo1aaQyfDPQ6Bw3ybQnj6fruH5Dxwd7D"

    # Create peer manager
    let pm = PeerManager.new(
      switch = SwitchBuilder.new().withRng(rng).withMplex().withNoise().build(),
      storage = nil)

    # Create 3 peer infos
    let peers = toSeq(1..3)
                  .mapIt(parsePeerInfo("/ip4/0.0.0.0/tcp/30300/p2p/" & basePeerId & $it))
                  .filterIt(it.isOk())
                  .mapIt(it.value)
    require:
      peers.len == 3

    # Add a peer[0] to the peerstore
    pm.peerStore[AddressBook][peers[0].peerId] = peers[0].addrs
    pm.peerStore[ProtoBook][peers[0].peerId] = @[WakuRelayCodec, WakuStoreCodec, WakuFilterCodec]

    # When no service peers, we get one from the peerstore
    let selectedPeer1 = pm.selectPeer(WakuStoreCodec)
    check:
      selectedPeer1.isSome() == true
      selectedPeer1.get().peerId == peers[0].peerId

    # Same for other protocol
    let selectedPeer2 = pm.selectPeer(WakuFilterCodec)
    check:
      selectedPeer2.isSome() == true
      selectedPeer2.get().peerId == peers[0].peerId

    # And return none if we dont have any peer for that protocol
    let selectedPeer3 = pm.selectPeer(WakuLightPushCodec)
    check:
      selectedPeer3.isSome() == false

    # Now we add service peers for different protocols peer[1..3]
    pm.addServicePeer(peers[1], WakuStoreCodec)
    pm.addServicePeer(peers[2], WakuLightPushCodec)

    # We no longer get one from the peerstore. Slots are being used instead.
    let selectedPeer4 = pm.selectPeer(WakuStoreCodec)
    check:
      selectedPeer4.isSome() == true
      selectedPeer4.get().peerId == peers[1].peerId

    let selectedPeer5 = pm.selectPeer(WakuLightPushCodec)
    check:
      selectedPeer5.isSome() == true
      selectedPeer5.get().peerId == peers[2].peerId

  test "peer manager cant have more max connections than peerstore size":
    # Peerstore size can't be smaller than max connections
    let peerStoreSize = 5
    let maxConnections = 10

    expect(Defect):
      let pm = PeerManager.new(
        switch = SwitchBuilder.new().withRng(rng).withMplex().withNoise()
        .withPeerStore(peerStoreSize)
        .withMaxConnections(maxConnections)
        .build(),
        storage = nil)

  test "prunePeerStore() correctly removes peers to match max quota":
    # Create peer manager
    let pm = PeerManager.new(
      switch = SwitchBuilder.new().withRng(rng).withMplex().withNoise()
      .withPeerStore(10)
      .withMaxConnections(5)
      .build(),
      maxFailedAttempts = 1,
      storage = nil)

    # Create 15 peers and add them to the peerstore
    let peers = toSeq(1..15)
              .mapIt(parsePeerInfo("/ip4/0.0.0.0/tcp/0/p2p/" & $PeerId.random().get()))
              .filterIt(it.isOk())
              .mapIt(it.value)
    for p in peers:
      pm.addPeer(p)

    # Check that we have 15 peers in the peerstore
    check:
      pm.peerStore.peers.len == 15

    # fake that some peers failed to connected
    pm.peerStore[NumberFailedConnBook][peers[0].peerId] = 2
    pm.peerStore[NumberFailedConnBook][peers[1].peerId] = 2
    pm.peerStore[NumberFailedConnBook][peers[2].peerId] = 2

    # fake that some peers are connected
    pm.peerStore[ConnectionBook][peers[5].peerId] = Connected
    pm.peerStore[ConnectionBook][peers[8].peerId] = Connected
    pm.peerStore[ConnectionBook][peers[10].peerId] = Connected
    pm.peerStore[ConnectionBook][peers[12].peerId] = Connected

    # Prune the peerstore (current=15, target=5)
    pm.prunePeerStore()

    check:
      # ensure peerstore was pruned
      pm.peerStore.peers.len == 10

      # ensure connected peers were not pruned
      pm.peerStore.peers.anyIt(it.peerId == peers[5].peerId)
      pm.peerStore.peers.anyIt(it.peerId == peers[8].peerId)
      pm.peerStore.peers.anyIt(it.peerId == peers[10].peerId)
      pm.peerStore.peers.anyIt(it.peerId == peers[12].peerId)

      # ensure peers that failed were the first to be pruned
      not pm.peerStore.peers.anyIt(it.peerId == peers[0].peerId)
      not pm.peerStore.peers.anyIt(it.peerId == peers[1].peerId)
      not pm.peerStore.peers.anyIt(it.peerId == peers[2].peerId)

  asyncTest "canBeConnected() returns correct value":
    let pm = PeerManager.new(
      switch = SwitchBuilder.new().withRng(rng).withMplex().withNoise()
      .withPeerStore(10)
      .withMaxConnections(5)
      .build(),
      initialBackoffInSec = 1, # with InitialBackoffInSec = 1 backoffs are: 1, 2, 4, 8secs.
      backoffFactor = 2,
      maxFailedAttempts = 10,
      storage = nil)
    var p1: PeerId
    require p1.init("QmeuZJbXrszW2jdT7GdduSjQskPU3S7vvGWKtKgDfkDvW" & "1")


    # new peer with no errors can be connected
    check:
      pm.canBeConnected(p1) == true

    # peer with ONE error that just failed
    pm.peerStore[NumberFailedConnBook][p1] = 1
    pm.peerStore[LastFailedConnBook][p1] = Moment.init(getTime().toUnix, Second)
    # we cant connect right now
    check:
      pm.canBeConnected(p1) == false

    # but we can after the first backoff of 1 seconds
    await sleepAsync(chronos.milliseconds(1200))
    check:
      pm.canBeConnected(p1) == true

    # peer with TWO errors, we can connect until 2 seconds have passed
    pm.peerStore[NumberFailedConnBook][p1] = 2
    pm.peerStore[LastFailedConnBook][p1] = Moment.init(getTime().toUnix, Second)

    # cant be connected after 1 second
    await sleepAsync(chronos.milliseconds(1000))
    check:
      pm.canBeConnected(p1) == false

    # can be connected after 2 seconds
    await sleepAsync(chronos.milliseconds(1200))
    check:
      pm.canBeConnected(p1) == true

    # can't be connected if failed attempts are equal to maxFailedAttempts
    pm.maxFailedAttempts = 2
    check:
      pm.canBeConnected(p1) == false

  test "peer manager must fail if max backoff is over a week":
    # Should result in overflow exception
    expect(Defect):
      let pm = PeerManager.new(
        switch = SwitchBuilder.new().withRng(rng).withMplex().withNoise()
        .withPeerStore(10)
        .withMaxConnections(5)
        .build(),
        maxFailedAttempts = 150,
        storage = nil)

    # Should result in backoff > 1 week
    expect(Defect):
      let pm = PeerManager.new(
        switch = SwitchBuilder.new().withRng(rng).withMplex().withNoise()
        .withPeerStore(10)
        .withMaxConnections(5)
        .build(),
        maxFailedAttempts = 10,
        storage = nil)

    let pm = PeerManager.new(
      switch = SwitchBuilder.new().withRng(rng).withMplex().withNoise()
      .withPeerStore(10)
      .withMaxConnections(5)
      .build(),
      maxFailedAttempts = 5,
      storage = nil)