{-# OPTIONS_GHC -fno-warn-orphans #-}
{-# Language TemplateHaskell #-}
{-# Language AllowAmbiguousTypes #-}
{-# Language UndecidableInstances #-}
{-# Language MultiWayIf #-}
module Main where

import HBS2.Prelude.Plated

import HBS2.Actors.Peer
import HBS2.Base58
import HBS2.Clock
import HBS2.Defaults
import HBS2.Events
import HBS2.Hash
import HBS2.Data.Types.Refs
import HBS2.Data.Types.SignedBox
import HBS2.Data.Types
import HBS2.Net.Auth.Credentials
import HBS2.Net.IP.Addr
import HBS2.Net.Messaging.UDP
import HBS2.Net.Messaging.TCP
import HBS2.Net.Messaging.Unix
import HBS2.Net.Messaging.Encrypted.ByPass
import HBS2.Net.PeerLocator
import HBS2.Net.Proto as Proto
import HBS2.Net.Proto.Definition
import HBS2.Net.Proto.Event.PeerExpired
import HBS2.Net.Proto.Peer
import HBS2.Net.Proto.PeerAnnounce
import HBS2.Net.Proto.PeerExchange
import HBS2.Net.Proto.PeerMeta
import HBS2.Net.Proto.RefLog
import HBS2.Net.Proto.RefChan
import HBS2.Net.Proto.Sessions
import HBS2.Net.Proto.Service
import HBS2.OrDie
import HBS2.Storage.Simple
import HBS2.Data.Detect

import HBS2.System.Logger.Simple hiding (info)

import Brains
import BrainyPeerLocator
import ByPassWorker
import PeerTypes
import BlockDownload
import CheckBlockAnnounce (checkBlockAnnounce)
import CheckPeer (peerBanned)
import DownloadQ
import PeerInfo
import PeerConfig
import Bootstrap
import CheckMetrics
import RefLog qualified
import RefLog (reflogWorker)
import HttpWorker
import DispatchProxy
import PeerMeta
import CLI.Common
import CLI.RefChan
import RefChan
import Fetch (fetchHash)
import Log

import HBS2.Peer.RPC.Internal.Types()
import HBS2.Peer.RPC.Internal.Storage()

import HBS2.Peer.RPC.API.Storage
import HBS2.Peer.RPC.API.Peer
import HBS2.Peer.RPC.API.RefLog
import HBS2.Peer.RPC.API.RefChan

import RPC2(RPC2Context(..))

import Codec.Serialise as Serialise
import Control.Concurrent (myThreadId)
import Control.Concurrent.STM
import Control.Exception as Exception
import Control.Monad.Reader
import Control.Monad.Trans.Maybe
import Control.Monad.Trans.Writer.CPS qualified as W
import Crypto.Saltine (sodiumInit)
import Data.ByteString.Lazy qualified as LBS
import Data.ByteString qualified as BS
import Data.Cache qualified as Cache
import Data.HashSet qualified as HashSet
import Data.List qualified as L
import Data.Map (Map)
import Data.Map qualified as Map
import Data.Maybe
import Data.Set qualified as Set
import Data.Set (Set)
import Data.Time.Clock (UTCTime, NominalDiffTime, diffUTCTime, getCurrentTime)
import Data.Time.Clock.POSIX
import Data.Time.LocalTime
import Data.Time.Format
import Lens.Micro.Platform as Lens
import Network.Socket
import Options.Applicative
import Prettyprinter.Render.Terminal
import System.Directory
import System.Environment
import System.Exit
import System.IO
import System.Mem
import System.Metrics
import System.Posix.Process

import UnliftIO.Exception qualified as U
-- import UnliftIO.STM
import UnliftIO.Async as U

import Control.Monad.Trans.Resource
import Streaming.Prelude qualified as S

-- TODO: write-workers-to-config
defStorageThreads :: Integral a => a
defStorageThreads = 4

defListenUDP :: String
defListenUDP = "0.0.0.0:7351"

defRpcUDP :: String
defRpcUDP = "localhost:13331"

defLocalMulticast :: String
defLocalMulticast = "239.192.152.145:10153"

data PeerListenKey
data PeerKeyFileKey
data PeerStorageKey
data PeerDebugKey
data PeerTraceKey
data PeerTrace1Key
data PeerProxyFetchKey


instance Monad m => HasCfgKey PeerDebugKey a m where
  key = "debug"

instance Monad m => HasCfgKey PeerTraceKey a m where
  key = "trace"

instance Monad m => HasCfgKey PeerTrace1Key a m where
  key = "trace1"

instance Monad m => HasCfgKey PeerListenKey (Maybe String) m where
  key = "listen"

instance Monad m => HasCfgKey PeerKeyFileKey (Maybe String) m where
  key = "key"

instance Monad m => HasCfgKey PeerStorageKey (Maybe String) m where
  key = "storage"

instance Monad m => HasCfgKey PeerProxyFetchKey (Set String) m where
  key = "proxy-fetch-for"


data PeerOpts =
  PeerOpts
  { _storage       :: Maybe StoragePrefix
  , _listenOn      :: Maybe String
  , _listenRpc     :: Maybe String
  , _peerCredFile  :: Maybe FilePath
  , _peerConfig    :: Maybe FilePath
  , _peerRespawn   :: Bool
  }
  deriving stock (Data)

makeLenses 'PeerOpts


main :: IO ()
main = do

  sodiumInit

  setLogging @INFO   defLog
  setLogging @ERROR  errorPrefix
  setLogging @WARN   warnPrefix
  setLogging @NOTICE noticePrefix

  setLoggingOff @TRACE
  setLoggingOff @TRACE1

  withSimpleLogger runCLI



data GOpts =
  GOpts
  { goDebug :: Bool
  , goTrace :: Bool
  }

runCLI :: IO ()
runCLI = do

  (g, cmd) <- customExecParser (prefs showHelpOnError) $
            info (helper <*> parser)
            (  fullDesc
            <> header "hbs2-peer daemon"
            <> progDesc "serves HBS2 protocol"
            )

  withOpts cmd g

  where


    parser ::  Parser (GOpts,IO ())
    parser = do

      (,) <$> ( GOpts <$> switch (long "debug" <> short 'd' <> help "debug mode on")
                      <*> switch (long "trace" <> help "trace on" )
              )
          <*> hsubparser (  command "init"      (info pInit (progDesc "creates default config"))
                <> command "run"       (info pRun  (progDesc "run peer"))
                <> command "poke"      (info pPoke (progDesc "poke peer by rpc"))
                <> command "die"       (info pDie (progDesc "die cmd"))
                <> command "announce"  (info pAnnounce (progDesc "announce block"))
                <> command "ping"      (info pPing (progDesc "ping another peer"))
                <> command "fetch"     (info pFetch (progDesc "fetch block"))
                <> command "reflog"    (info pRefLog (progDesc "reflog commands"))
                <> command "refchan"   (info pRefChan (progDesc "refchan commands"))
                <> command "peers"     (info pPeers (progDesc "show known peers"))
                <> command "pexinfo"   (info pPexInfo (progDesc "show pex"))
                <> command "download"  (info pDownload  (progDesc "download management"))
                <> command "poll"      (info pPoll  (progDesc "polling management"))
                <> command "log"       (info pLog   (progDesc "set logging level"))
                <> command "bypass"    (info pByPass (progDesc "bypass"))
                -- FIXME: bring-back-dialogue-over-separate-socket
                -- <> command "dial"      (info pDialog (progDesc "dialog commands"))
                )

    confOpt = strOption ( long "config"  <> short 'c' <> help "config" )

    rpcOpt = strOption ( short 'r' <> long "rpc"
                                   <> help "addr:port" )


    common = do
      pref <- optional $ strOption ( short 'p' <> long "prefix"
                                               <> help "storage prefix" )

      l    <- optional $ strOption ( short 'l' <> long "listen"
                                    <> help "addr:port" )

      r    <- optional rpcOpt

      k    <- optional $ strOption ( short 'k' <> long "key"
                                    <> help "peer keys file" )

      c <- optional confOpt

      resp <- (optional $ flag' True ( long "no-respawn" <> short 'R' <> help "NO respawn"))
                     <&> isNothing

      -- NOTE: respawn-by-default-now
      pure $ PeerOpts pref l r k c resp

    withOpts m g = do

      when (goDebug g) do
        setLogging @DEBUG ( debugPrefix  . toStderr )

      when (goTrace g) do
        setLogging @TRACE ( tracePrefix  . toStderr )

      m

    pRun = do
      runPeer <$> common

    pRpcCommon = do
      RPCOpt <$> optional confOpt
             <*> optional rpcOpt

    pDie = do
      rpc <- pRpcCommon
      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        l <- async $ void $ callService @RpcDie caller ()
        pause @'Seconds 0.25
        cancel l

    pPoke = do
      rpc <- pRpcCommon
      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        e <- race ( pause @'Seconds 0.25) do
          r <- callService @RpcPoke caller ()
          case r of
            Left e -> die (show e)
            Right txt -> putStrLn txt >> exitSuccess

        liftIO $ either (const $ exitFailure) (const $ exitSuccess) e

    pAnnounce = do
      rpc <- pRpcCommon
      h   <- strArgument ( metavar "HASH" )
      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        void $ callService @RpcAnnounce caller h

    pFetch = do
      rpc <- pRpcCommon
      h   <- strArgument ( metavar "HASH" )
      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        void $ callService @RpcFetch caller h

    pPing = do
      rpc <- pRpcCommon
      h   <- strArgument ( metavar "ADDR" )
      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        callService @RpcPing caller h >>= \case
          Left e -> err (viaShow e)
          Right True  -> putStrLn "pong"
          Right False -> putStrLn "pang"

    pPeers = do
      rpc <- pRpcCommon
      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        r <- callService @RpcPeers caller ()
        case r of
          Left e -> err (viaShow e)
          Right p -> do
            print $ vcat (fmap fmt p)
      where
        fmt (a, b) = pretty (AsBase58 a) <+> pretty b

    pPexInfo = do
      rpc <- pRpcCommon
      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        r <- callService @RpcPexInfo caller ()
        case r of
          Left e -> err (viaShow e)
          Right p -> do
            print $ vcat (fmap pretty p)

    onOff l =
            hsubparser ( command "on" (info (pure (l True) ) (progDesc "on")  ) )
      <|>   hsubparser ( command "off" (info (pure (l False) ) (progDesc "off")  ) )

    pLog = do
      rpc <- pRpcCommon
      setlog <- hsubparser ( command "trace"  (info (onOff TraceOn) (progDesc "set trace")  ) )
                  <|>
                hsubparser ( command "debug"  (info (onOff DebugOn) (progDesc "set debug")  ) )

      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        void $ callService @RpcLogLevel caller setlog

    pInit = do
      pref <- optional $ strArgument ( metavar "DIR" )
      pure $ peerConfigInit pref

    pRefLog = hsubparser (  command "send" (info pRefLogSend (progDesc "send reflog transaction" ))
                         <> command "send-raw" (info pRefLogSendRaw (progDesc "send reflog raw transaction" ))
                         <> command "fetch" (info pRefLogFetch (progDesc "fetch reflog from all" ))
                         <> command "get"   (info pRefLogGet (progDesc "get own reflog from all" ))
                         )

    pRefLogSend = do
      rpc <- pRpcCommon
      kr <- strOption (long  "keyring" <> short 'k' <> help "reflog keyring" <> metavar "FILE")
      pure $ withMyRPC @RefLogAPI rpc $ \caller -> do
        s <- BS.readFile kr
        creds <- pure (parseCredentials @(Encryption L4Proto) (AsCredFile s)) `orDie` "bad keyring file"
        bs <- BS.take defChunkSize  <$> BS.hGetContents stdin
        let pubk = view peerSignPk creds
        let privk = view peerSignSk creds
        msg <- makeRefLogUpdate @L4Proto pubk privk bs
        void $ callService @RpcRefLogPost caller msg

    pRefLogSendRaw = do
      rpc <- pRpcCommon
      pure $ withMyRPC @RefLogAPI rpc $ \caller -> do
        bs <- LBS.take defChunkSize  <$> LBS.hGetContents stdin
        msg <- pure (deserialiseOrFail @(RefLogUpdate L4Proto) bs) `orDie` "Invalid reflog transaction"
        void $ callService @RpcRefLogPost caller msg

    pRefLogFetch = do
      rpc <- pRpcCommon
      ref <- strArgument ( metavar "REFLOG-KEY" )
      pure $ withMyRPC @RefLogAPI rpc $ \caller -> do
        href <- pure (fromStringMay ref) `orDie` "invalid REFLOG-KEY"
        void $ callService @RpcRefLogFetch caller href

    pRefLogGet = do
      rpc <- pRpcCommon
      ref <- strArgument ( metavar "REFLOG-KEY" )
      pure $ withMyRPC @RefLogAPI rpc $ \caller -> do
        href <- pure (fromStringMay ref) `orDie` "invalid REFLOG-KEY"
        callService @RpcRefLogGet caller href >>= \case
          Left{} -> exitFailure
          Right Nothing -> exitFailure
          Right (Just h) -> print (pretty h) >> exitSuccess


    pPoll = hsubparser (  command "list" (info pPollList (progDesc "list current pollers" ))
                       <> command "add" (info  pPollAdd (progDesc "add poller" ))
                       <> command "del" (info  pPollDel (progDesc "del poller" ))
                       )


    pPollAdd = do
      rpc <- pRpcCommon
      r <- argument refP (metavar "REF")
      t <- strArgument (metavar "TYPE")
      i <- argument auto (metavar "INTERVAL")
      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        callService @RpcPollAdd caller (r, t, i) >>= \case
          Left e -> die (show e)
          _      -> liftIO do
                       hPutDoc stdout $ "added poller for" <+> pretty (AsBase58 r)
                       exitSuccess

    pPollDel = do
      rpc <- pRpcCommon
      r <- argument refP (metavar "REF")
      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        callService @RpcPollDel caller r >>= \case
          Left e -> die (show e)
          _      -> liftIO do
                       hPutDoc stdout $ "deleted poller for" <+> pretty (AsBase58 r)
                       exitSuccess

    pPollList = do
      rpc <- pRpcCommon
      -- ref <- strArgument ( metavar "REFLOG-KEY" )
      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        void $ runMaybeT do
          polls <- toMPlus =<< callService @RpcPollList caller ()
          forM_ polls $ \(r,what,t) -> do
           liftIO $ hPutDoc stdout $ fill 44 (pretty (AsBase58 r))
                                     -- TODO: align-right
                                     <+> fill 3 (pretty t)
                                     <+> pretty what
                                     <> line


    pDownload = hsubparser (  command "list" (info pDownList (progDesc "list current downloads" ))
                           <> command "del" (info pDownDel (progDesc "delete download" ))
                           )

    pDownDel = do
      rpc <- pRpcCommon
      href <- argument hashP ( metavar "HASH-REF")
      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        void $ runMaybeT do
         toMPlus =<< callService @RpcDownloadDel caller href

    pDownList = do
      rpc <- pRpcCommon
      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        void $ runMaybeT do
         -- now <- getU
         d <- toMPlus =<< callService @RpcDownloadList caller ()
         now <- liftIO getPOSIXTime
         liftIO $ print $ vcat (fmap (fmt now) d)
         pure ()

      where
        fmt now (h,u) = pretty (AsBase58 h) <+> pretty diff
          where
            delta = now - fromIntegral u
            diff = formatTime defaultTimeLocale "%d:%H:%M:%S" delta

    pByPass = hsubparser (  command "show" (info pByPassShow (progDesc "show bypass info" ))
                         )

    pByPassShow = do
      rpc <- pRpcCommon
      pure $ withMyRPC @PeerAPI rpc $ \caller -> do
        void $ runMaybeT do
         d <- toMPlus =<< callService @RpcByPassInfo caller ()
         liftIO $ print $ pretty d

    refP :: ReadM (PubKey 'Sign HBS2Basic)
    refP = maybeReader fromStringMay

    hashP :: ReadM HashRef
    hashP = maybeReader fromStringMay

myException :: SomeException -> IO ()
myException e = err ( show e )


newtype CredentialsM e s m a =
  CredentialsM { fromCredentials :: ReaderT (PeerCredentials s) m a }
  deriving newtype ( Functor
                   , Applicative
                   , Monad
                   , MonadIO
                   , MonadReader (PeerCredentials s)
                   , MonadTrans)

withCredentials :: forall e s m a . (HasOwnPeer e m, Monad m, s ~ Encryption e)
                => PeerCredentials s
                -> CredentialsM e s m a -> m a

withCredentials pc m = runReaderT (fromCredentials m) pc


instance (Monad m, HasTimeLimits e p m, s ~ Encryption e) => HasTimeLimits  e p (CredentialsM e s m) where
  tryLockForPeriod p m = lift $ tryLockForPeriod p m

instance (HasOwnPeer e m) => HasOwnPeer e (CredentialsM e s m) where
  ownPeer = lift ownPeer

instance (Monad m, HasFabriq e m, s ~ Encryption e) => HasFabriq e (CredentialsM e s m)  where
  getFabriq = lift getFabriq

instance (Sessions e p m, s ~ Encryption e) => Sessions e p (CredentialsM e s m)  where
  find k f = lift (find k f)
  fetch i d k f = lift (fetch i d k f)
  update d k f = lift (update d k f)
  expire k = lift (expire  k)

instance (Monad m, HasPeerNonce e m, s ~ Encryption e) => HasPeerNonce e (CredentialsM e s m) where
  peerNonce = lift $ peerNonce @e

instance (Monad m, s ~ Encryption e) => HasCredentials s (CredentialsM e s m) where
  getCredentials = ask

instance (Monad m, s ~ Encryption e) => HasCredentials s (ResponseM e (CredentialsM e s m)) where
  getCredentials = lift getCredentials

instance (Monad m, HasThatPeer e p m, s ~ Encryption e) => HasThatPeer e p (CredentialsM e s m) where
  thatPeer = lift . thatPeer

instance ( EventEmitter e p m
         ) => EventEmitter e p (CredentialsM e s m) where

  emit k d = lift $ emit k d

instance ( Monad m
         , Response e p m
         , s ~ Encryption e
         ) => Response e p (CredentialsM e s m) where

  response = lift . response

respawn :: PeerOpts -> IO ()
respawn opts =
  if not (view peerRespawn opts) then do
    exitFailure
  else do
    let secs = 5
    notice $ "RESPAWNING in" <+> viaShow secs <> "s"
    pause @'Seconds secs
    self <- getExecutablePath
    args <- getArgs
    print (self, args)
    executeFile self False args Nothing

runPeer :: forall e s . ( e ~ L4Proto
                        , FromStringMaybe (PeerAddr e)
                        , s ~ Encryption e
                        , HasStorage (PeerM e IO)
                        )=> PeerOpts -> IO ()

runPeer opts = U.handle (\e -> myException e
                        >> performGC
                        >> respawn opts
                        ) $ runResourceT do

  metrics <- liftIO newStore

  xdg <- liftIO $ getXdgDirectory XdgData defStorePath <&> fromString

  conf@(PeerConfig syn) <- peerConfigRead (view peerConfig opts)

  liftIO $ print $ pretty conf

  let listenConf      = runReader (cfgValue @PeerListenKey)  syn
  let keyConf         = runReader (cfgValue @PeerKeyFileKey) syn
  let storConf        = runReader (cfgValue @PeerStorageKey) syn <&> StoragePrefix
  let traceConf       = runReader (cfgValue @PeerTraceKey)   syn
  let debugConf       = runReader (cfgValue @PeerDebugKey)   syn :: FeatureSwitch
  let trace1Conf      = runReader (cfgValue @PeerTrace1Key)  syn :: FeatureSwitch
  let helpFetchKeys   = runReader (cfgValue @PeerProxyFetchKey) syn & toKeys
  let tcpListen       = runReader (cfgValue @PeerListenTCPKey) syn & fromMaybe ""
  let tcpProbeWait    = runReader (cfgValue @PeerTcpProbeWaitKey) syn
                          & fromInteger @(Timeout 'Seconds) . fromMaybe 300


  let listenSa = view listenOn opts <|> listenConf <|> Just defListenUDP
  credFile <- pure (view peerCredFile opts <|> keyConf) `orDie` "credentials not set"

  let pref = view storage opts <|> storConf <|> Just xdg

  debug $ "storage prefix:" <+> pretty pref

  liftIO $ print $ pretty "debug: " <+> pretty (show debugConf)
  liftIO $ print $ pretty "trace: " <+> pretty (show traceConf)
  liftIO $ print $ pretty "trace1: " <+> pretty (show trace1Conf)

  when (traceConf == FeatureOn) do
    setLogging @TRACE tracePrefix
    setLogging @DEBUG debugPrefix

  when (debugConf == FeatureOn) do
    setLogging @DEBUG debugPrefix

  when (trace1Conf == FeatureOn) do
    setLogging @TRACE1 tracePrefix



  let ps = mempty

  pc' <- liftIO $ LBS.readFile credFile
            <&> parseCredentials @(Encryption e) . AsCredFile
                                                 . LBS.toStrict
                                                 . LBS.take 4096

  pc <- pure pc' `orDie` "can't parse credential file"

  notice $ "run peer" <+> pretty (AsBase58 (view peerSignPk pc))

  s <- simpleStorageInit @HbSync (Just pref)
  let blk = liftIO . hasBlock s


  w <- replicateM defStorageThreads $ async $ liftIO $ simpleStorageWorker s

  localMulticast <- liftIO $ (headMay <$> parseAddrUDP (fromString defLocalMulticast)
                                      <&> fmap (fromSockAddr @'UDP . addrAddress) )

                           `orDie` "assertion: localMulticastPeer not set"

  notice $ "multicast:" <+> pretty localMulticast

  mess <- newMessagingUDP False listenSa
            `orDie` "unable listen on the given addr"

  udp <- async $ runMessagingUDP mess

  let udpAddr = getOwnPeer mess

  mcast <- newMessagingUDPMulticast defLocalMulticast
            `orDie` "Can't start RPC listener"

  messMcast <- async $ runMessagingUDP mcast

  brains <- newBasicBrains @e conf

  brainsThread <- async $ runBasicBrains conf brains

  denv <- newDownloadEnv brains

  pl <- AnyPeerLocator <$> newBrainyPeerLocator @e (SomeBrains @e brains) mempty

  let addr' = fromStringMay @(PeerAddr L4Proto) tcpListen

  trace $ "TCP addr:" <+> pretty tcpListen <+> pretty addr'

  tcp <- maybe1 addr' (pure Nothing) $ \addr -> do
           tcpEnv <- newMessagingTCP addr <&> set tcpOnClientStarted (onClientTCPConnected brains)
           -- FIXME: handle-tcp-thread-somehow
           void $ async $ runMessagingTCP tcpEnv
           pure $ Just tcpEnv

  let mudp = Just $ Dispatched mess

  let tcpaddr = view tcpOwnPeer <$> tcp

  let mtcp = Dispatched <$> tcp

  let points = catMaybes [ (udpAddr ,) <$> mudp
                         , (,) <$> tcpaddr <*> mtcp
                         ]

  proxy <- newDispatchProxy points $ \_ pip -> case view sockType pip of
             TCP -> pure mtcp
             UDP -> pure mudp

  -- TODO: get-rid-of-from-addr
  --   From addres в Messaging -- пережиток,
  --   ни на что не влияет, ни для чего не нужен.
  --   Таскается везде со времени, когда Messaging был
  --   через TQueue. Нужно его удалить повсеместно
  --   Или сделать некий AnyAddr/DefaultAddr
  byPass <- newByPassMessaging @L4Proto
                          byPassDef
                          proxy
                          (getOwnPeer mess)
                          (view peerSignPk pc)
                          (view peerSignSk pc)

  penv <- newPeerEnv pl (AnyStorage s) (Fabriq byPass) (getOwnPeer mess)

  proxyThread <- async $ runDispatchProxy proxy

  let peerMeta = mkPeerMeta conf penv

  nbcache <- liftIO $ Cache.newCache (Just $ toTimeSpec ( 600 :: Timeout 'Seconds))

  void $ async $ forever do
    pause @'Seconds 600
    liftIO $ Cache.purgeExpired nbcache

  rce <- refChanWorkerEnv conf penv denv

  let refChanAdapter = RefChanAdapter
                           { refChanOnHead = refChanOnHeadFn rce
                           , refChanSubscribed = isPolledRef @e brains
                           , refChanWriteTran = refChanWriteTranFn rce
                           , refChanValidatePropose = refChanValidateTranFn @e rce
                           , refChanNotifyRely = refChanNotifyRelyFn @e rce
                           }

  rcw <- async $ liftIO $ runRefChanRelyWorker rce refChanAdapter

  let onNoBlock (p, h) = do
        already <- liftIO $ Cache.lookup nbcache (p,h) <&> isJust
        unless already do
          mpde <- find (KnownPeerKey p) id
          maybe1 mpde none $ \pd -> do
            let pk = view peerSignKey pd
            when (Set.member pk helpFetchKeys) do
              liftIO $ Cache.insert nbcache (p,h) ()
              -- debug  $ "onNoBlock" <+> pretty p <+> pretty h
              withPeerM penv $ withDownload denv (addDownload mzero h)

  loop <- liftIO $ async do

            runPeerM penv $ do
              adapter <- mkAdapter

              reflogReqAdapter <- RefLog.mkRefLogRequestAdapter @e

              let doDownload h = do
                    pro <- isReflogProcessed @e brains h
                    if pro then do
                      withPeerM penv $ withDownload denv (addDownload mzero h)
                    else do
                      -- FIXME: separate-process-to-mark-logs-processed
                      withPeerM penv $ withDownload denv (processBlock h)

              let doFetchRef puk = do
                   withPeerM penv $ do
                     forKnownPeers @e $ \p _ -> do
                       request p (RefLogRequest @e puk)

              let rwa = RefLog.RefLogWorkerAdapter
                   { RefLog.reflogDownload = doDownload
                   , RefLog.reflogFetch = doFetchRef
                   }

              let addNewRtt (p,rttNew) = withPeerM penv $ void $ runMaybeT do
                    def <- newPeerInfo
                    tv <- lift $ fetch True def (PeerInfoKey p) (view peerRTTBuffer)
                    insertRTT rttNew tv

              let hshakeAdapter = PeerHandshakeAdapter addNewRtt

              env <- ask

              pnonce <- peerNonce @e

              pl <- getPeerLocator @e

              addPeers @e pl ps

              subscribe @e PeerAnnounceEventKey $ \(PeerAnnounceEvent pip nonce) -> do
               unless (nonce == pnonce) $ do
                 debug $ "Got peer announce!" <+> pretty pip
                 mpd :: Maybe (PeerData e) <- find (KnownPeerKey pip) id
                 banned <- maybe (pure False) (peerBanned conf) mpd
                 let known = isJust mpd && not banned
                 sendPing pip

              subscribe @e BlockAnnounceInfoKey $ \(BlockAnnounceEvent p bi no) -> do
                 pa <- toPeerAddr p
                 checkBlockAnnounce conf denv no pa (view biHash bi)

              subscribe @e AnyKnownPeerEventKey $ \(KnownPeerEvent p pd) -> do

                let thatNonce = view peerOwnNonce pd

                now <- liftIO getTimeCoarse

                -- defPeerInfo <- newPeerInfo
                -- fetch True defPeerInfo (PeerInfoKey p) id >>= \pinfo -> do

                find (PeerInfoKey p) id >>= mapM_ \pinfo -> do
                      liftIO $ atomically $ writeTVar (view peerPingFailed pinfo) 0
                      liftIO $ atomically $ writeTVar (view peerLastWatched pinfo) now

                banned <- peerBanned conf pd

                let doAddPeer p = do
                      addPeers pl [p]

                      -- TODO: better-handling-for-new-peers
                      npi    <- newPeerInfo

                      here <- find @e (KnownPeerKey p) id <&> isJust

                      unless here do
                        debug $ "Got authorized peer!" <+> pretty p
                                                       <+> pretty (AsBase58 (view peerSignKey pd))
                        request @e p (GetPeerMeta @e)


                -- FIXME: check if we've got a reference to ourselves
                if | pnonce == thatNonce -> do
                    debug $ "GOT OWN NONCE FROM" <+> pretty p
                    delPeers pl [p]
                    addExcluded pl [p]
                    expire (KnownPeerKey p)

                   | banned -> do
                       notice $ pretty p <+> "banned"

                   | otherwise -> do

                    update pd (KnownPeerKey p) id

                    pdkv :: Map BS.ByteString (Peer L4Proto) <- fmap (Map.fromList . catMaybes)
                        $ knownPeers @e pl >>= mapM \pip ->
                              fmap (, pip) <$> find (KnownPeerKey pip) (view peerOwnNonce)

                    let proto1 = view sockType p

                    case Map.lookup thatNonce pdkv of

                      -- TODO: prefer-local-peer-with-same-nonce-over-remote-peer
                      --   remove remote peer
                      --   add local peer

                      -- FIXME: move-protocol-comparison-to-peer-nonce
                      --

                      Nothing -> doAddPeer p

                      Just p0 -> do

                        pa0 <- toPeerAddr p0
                        pa1 <- toPeerAddr p

                        if | pa0 == pa1 -> none
                           | view sockType p0 /= view sockType p -> do
                              doAddPeer p

                           | otherwise -> do

                              debug "Same peer, different address"

                              void $ runMaybeT do

                                pinfo0 <- MaybeT $ find (PeerInfoKey p0) id
                                pinfo1 <- MaybeT $ find (PeerInfoKey p) id

                                rtt0 <- MaybeT $ medianPeerRTT pinfo0
                                rtt1 <- MaybeT $ medianPeerRTT pinfo1

                                when ( rtt1 < rtt0 ) do
                                  debug $ "Better rtt!" <+> pretty p0
                                                        <+> pretty p
                                                        <+> pretty rtt0
                                                        <+> pretty rtt1

                                  lift $ do
                                    expire (KnownPeerKey p0)
                                    delPeers pl [p0]
                                    -- addExcluded pl [p0]
                                    doAddPeer p


              void $ liftIO $ async $ withPeerM env do
                pause @'Seconds 1
                debug "sending first peer announce"
                request localMulticast (PeerAnnounce @e pnonce)

              let peerThread t mx = W.tell . L.singleton =<< (liftIO . async) do
                    withPeerM env mx
                      `U.withException` \e -> case fromException e of
                        Just (e' :: AsyncCancelled) -> pure ()
                        Nothing -> do
                          err ("peerThread" <+> viaShow t <+> "Failed with" <+> viaShow e)
                          throwM e -- threadSelf (SomeException e)

                    debug $ "peerThread Finished:" <+> t

              workers <- W.execWriterT do

                peerThread "local multicast" $ forever $ do
                  pause defPeerAnnounceTime -- FIXME: setting!
                  debug "sending local peer announce"
                  request localMulticast (PeerAnnounce @e pnonce)

                peerThread "byPassWorker" (byPassWorker byPass penv)

                peerThread "httpWorker" (httpWorker conf peerMeta denv)

                peerThread "checkMetrics" (checkMetrics metrics)

                peerThread "peerPingLoop" (peerPingLoop @e conf penv)

                peerThread "knownPeersPingLoop" (knownPeersPingLoop @e conf (SomeBrains brains))

                peerThread "bootstrapDnsLoop" (bootstrapDnsLoop @e conf)

                peerThread "pexLoop" (pexLoop @e brains tcp)

                peerThread "blockDownloadLoop" (blockDownloadLoop denv)

                peerThread "blockDownloadQ" (downloadQueue conf (SomeBrains brains) denv)

                peerThread "fillPeerMeta" (fillPeerMeta tcp tcpProbeWait)

                peerThread "postponedLoop" (postponedLoop denv)

                peerThread "reflogWorker" (reflogWorker @e conf (SomeBrains brains) rwa)

                peerThread "refChanWorker" (refChanWorker @e rce (SomeBrains brains))

                peerThread "all protos" do
                  runProto @e
                    [ makeResponse (blockSizeProto blk dontHandle onNoBlock)
                    , makeResponse (blockChunksProto adapter)
                    , makeResponse blockAnnounceProto
                    , makeResponse (withCredentials @e pc . peerHandShakeProto hshakeAdapter penv)
                    -- , makeResponse (withCredentials @e pc . encryptionHandshakeProto encryptionHshakeAdapter)
                    , makeResponse peerExchangeProto
                    , makeResponse refLogUpdateProto
                    , makeResponse (refLogRequestProto reflogReqAdapter)
                    , makeResponse (peerMetaProto peerMeta)
                    , makeResponse (refChanHeadProto False refChanAdapter)
                    , makeResponse (refChanUpdateProto False pc refChanAdapter)
                    , makeResponse (refChanRequestProto False refChanAdapter)
                    , makeResponse (refChanNotifyProto False refChanAdapter)
                    ]

              void $ liftIO $ waitAnyCancel workers

  let refChanHeadPostAction href = do
        void $ liftIO $ withPeerM penv $ do
          let h = fromHashRef href
          debug $ "rpc.refChanHeadPost" <+> pretty h
          me <- ownPeer @e
          sto <- getStorage

          chunks <- S.toList_ $ do
            deepScan ScanDeep (const none) h (liftIO . getBlock sto) $ \ha -> do
              unless (ha == h) do
                blk <- liftIO $ getBlock sto ha
                maybe1 blk none S.yield

          let box = deserialiseOrFail @(SignedBox (RefChanHeadBlock e) e) (LBS.concat chunks)

          case box of
            -- FIXME: proper-error-handling
            Left{} -> err $ "can't read head block" <+> pretty h
            Right (SignedBox k _ _) -> do
              let msg = RefChanHead k (RefChanHeadBlockTran (HashRef h))
              refChanNotifyOnUpdated rce k
              runResponseM me $ refChanHeadProto @e True refChanAdapter msg

  let refChanProposeAction (puk, box) = do
        debug $ "rpc.reChanPropose" <+> pretty (AsBase58 puk)
        void $ liftIO $ withPeerM penv $ do
          me <- ownPeer @e
          runMaybeT do
            proposed <- MaybeT $ makeProposeTran @e pc puk box
            lift $ runResponseM me $ refChanUpdateProto @e True pc refChanAdapter (Propose @e puk proposed)

  -- NOTE: moved-to-rpc
  let refChanNotifyAction (puk, box) = do
        void $ liftIO $ withPeerM penv $ do
          me <- ownPeer @e
          runMaybeT do
            lift $ runResponseM me $ refChanNotifyProto @e True refChanAdapter (Notify @e puk box)

  menv <- newPeerEnv pl (AnyStorage s) (Fabriq mcast) (getOwnPeer mcast)

  ann <- liftIO $ async $ runPeerM menv $ do

                   self <- ownPeer @e

                   subscribe @e BlockAnnounceInfoKey $ \(BlockAnnounceEvent p bi no) -> do
                    unless (p == self) do
                      pa <- toPeerAddr p
                      checkBlockAnnounce conf denv no pa (view biHash bi)

                   subscribe @e PeerAnnounceEventKey $ \pe@(PeerAnnounceEvent pip nonce) -> do
                      -- debug $ "Got peer announce!" <+> pretty pip
                      emitToPeer penv PeerAnnounceEventKey pe

                   runProto @e
                     [ makeResponse blockAnnounceProto
                     , makeResponse peerAnnounceProto
                     ]


  let k = view peerSignPk pc

  let http = case runReader (cfgValue @PeerHttpPortKey @(Maybe Integer)) syn of
               Nothing -> mempty
               Just p  -> "http-port:" <+> pretty p

  let rpc = getRpcSocketName conf

  let pokeAnsw = show $ vcat [ "peer-key:" <+> dquotes (pretty (AsBase58 k))
                             , "udp:" <+> dquotes (pretty (listenAddr mess))
                             , "local-multicast:" <+> dquotes (pretty localMulticast)
                             , "rpc:" <+> dquotes (pretty rpc)
                             , http
                             ]

  let rpcSa = getRpcSocketName conf
  rpcmsg <- newMessagingUnix True 1.0 rpcSa

  let rpcctx = RPC2Context { rpcConfig = fromPeerConfig conf
                            , rpcMessaging = rpcmsg
                            , rpcPokeAnswer = pokeAnsw
                            , rpcPeerEnv = penv
                            , rpcLocalMultiCast = localMulticast
                            , rpcStorage = AnyStorage s
                            , rpcBrains = SomeBrains brains
                            , rpcByPassInfo = liftIO (getStat byPass)
                            , rpcDoFetch = liftIO . fetchHash penv denv
                            , rpcDoRefChanHeadPost = refChanHeadPostAction
                            , rpcDoRefChanPropose = refChanProposeAction
                            , rpcDoRefChanNotify = refChanNotifyAction
                            }

  m1 <- async $ runMessagingUnix rpcmsg
  link m1

  rpcProto <- async $ flip runReaderT rpcctx do
    runProto @UNIX
      [ makeResponse (makeServer @PeerAPI)
      , makeResponse (makeServer @RefLogAPI)
      , makeResponse (makeServer @RefChanAPI)
      , makeResponse (makeServer @StorageAPI)
      ]

  link proxyThread
  link rpcProto
  link loop

  void $ waitAnyCancel $ w <> [ udp
                              , loop
                              , m1
                              , rpcProto
                              , ann
                              , messMcast
                              , proxyThread
                              , brainsThread
                              ]

  liftIO $ simpleStorageStop s



emitToPeer :: ( MonadIO m
              , EventEmitter e a (PeerM e IO)
              )
           => PeerEnv e
           -> EventKey e a
           -> Event e a
           -> m ()

emitToPeer env k e = liftIO $ withPeerM env (emit k e)