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{-# language TupleSections #-}
{-# language LambdaCase #-}
{-# language RecordWildCards #-}
{-# language OverloadedStrings #-}
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{-|
Module      : Argo.Stack
Description : Argo stack library
Copyright   : (c) Valentin Reis, 2018
License     : MIT
Maintainer  : fre@freux.fr
-}

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module Argo.Stack
  ( StackOutput(..)
  , cleanLeftovers
  , runStack
  )
where

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import           Argo.Types
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import           Data.Coerce                    ( coerce )
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import           Turtle
import           Turtle.Shell
import           Prelude                 hiding ( FilePath )

import           Filesystem.Path                ( (</>) )

import           Control.Concurrent.Async

import           Data.Text                     as T
                                         hiding ( empty )
import           Argo.Utils
import           System.Process                as P
                                         hiding ( shell )
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import           Control.Monad                  ( mapM_
                                                , filterM
                                                )
import           Data.Foldable                  ( for_ )
import           Data.Traversable               ( for )
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import           Data.Maybe
import           Control.Foldl                 as Fold
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                                                ( length )
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import           Text.Show.Pretty

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cleanLeftovers :: WorkingDirectory -> Shell () --TODO
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cleanLeftovers (WorkingDirectory wd) = do
  printInfo "Cleaning sockets."
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  for_ socklist cleanSocket
  printInfo "Cleaning output directory."
  void $ shell (format ("rm -rf " % fp) wd) Turtle.empty
 where
  socklist =
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    [ "/tmp/nrm-downstream-in"
    , "/tmp/nrm-downstream-event"
    , "/tmp/nrm-upstream-in"
    , "/tmp/nrm-upstream-event"
    ]
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prepareDaemon
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  :: StdOutLog
  -> StdErrLog
  -> Maybe TestText
  -> Verbosity
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  -> PowerCap
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  -> Shell Instrumentation
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prepareDaemon out stdErr test v powercap = do
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  let confPath' = "/tmp/argo_nodeos_config"
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  cleanContainers confPath'
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  export "ARGO_NODEOS_CONFIG" (format fp confPath')
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  return $ Instrumentation
    (P.proc "daemon"
            (["--nrm_log", "./nrm_log"] ++ toOption v ++ toOption powercap)
    )
    out
    stdErr
    test
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 where
  nodeOsFailure n = do
    printError ("argo_nodeos_config failed with exit code :" <> repr n)
    testfile ".argo_nodeos_config_exit_message" >>= \case
      True -> do
        printInfo "Contents of .argo_nodeos_config_exit_message: "
        view $ input ".argo_nodeos_config_exit_message"
      False -> die ("argo_nodeos_config failed with exit code " <> repr n)
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  cleanContainers :: FilePath -> Shell ()
  cleanContainers argo_nodeos_config =
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    verboseShell'
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        (format ("sudo " % fp % " --clean_config=kill_content:true")
                argo_nodeos_config
        )
        empty
      >>= \case
            (ExitFailure n, _, _) -> nodeOsFailure n
            (ExitSuccess  , _, _) -> return ()
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cmdRunI
  :: AppName
  -> [AppArg]
  -> ContainerName
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  -> ShareDir
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  -> ManifestName
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  -> [(EnvVar, Text)]
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  -> ProcessBehavior
  -> Maybe (StackI, Instrumentation)
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cmdRunI (AppName app) args (ContainerName cn) (ShareDir md) (ManifestName mn) vars pb
  = Just (Run, ) <*> processBehaviorToI (pp { P.env = Just $ cast <$> vars }) pb
 where
  argToText (AppArg a) = a
  cast :: (EnvVar, Text) -> (String, String)
  cast (EnvVar v, y) = (T.unpack v, T.unpack y)
  pp =
    P.proc "cmd"
      $  [ "run"
         , "-u"
         , T.unpack cn
         , encodeString $ md <> "manifests" </> mn
         , T.unpack app
         ]
      ++ fmap (T.unpack . argToText) args
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cmdListenI
  :: ContainerName -> ProcessBehavior -> Maybe (StackI, Instrumentation)
cmdListenI (ContainerName cn) pb =
  Just (Listen, )
    <*> processBehaviorToI (P.proc "cmd" ["listen", "-u", T.unpack cn]) pb

cmdListenProgressI
  :: ContainerName -> ProcessBehavior -> Maybe (StackI, Instrumentation)
cmdListenProgressI (ContainerName cn) pb =
  Just (Progress, )
    <*> processBehaviorToI
          (P.proc "cmd" ["listen", "-u", T.unpack cn, "--filter", "progress"])
          pb

cmdListenPerformanceI
  :: ContainerName -> ProcessBehavior -> Maybe (StackI, Instrumentation)
cmdListenPerformanceI (ContainerName cn) pb =
  Just (Performance, )
    <*> processBehaviorToI
          (P.proc "cmd" ["listen", "-u", T.unpack cn, "--filter", "performance"]
          )
          pb

cmdListenPowerI
  :: ContainerName -> ProcessBehavior -> Maybe (StackI, Instrumentation)
cmdListenPowerI (ContainerName cn) pb =
  Just (Power, )
    <*> processBehaviorToI
          (P.proc "cmd" ["listen", "-u", T.unpack cn, "--filter", "power"])
          pb

data StackOutput =
    FoundMessage Text
  | FoundTracebacks Tracebacks
  | Died StackI ExitCode TracebackScanOut TracebackScanErr Tracebacks deriving (Show)
type Tracebacks = [(StackI, Text, Text)]
newtype TracebackScanOut = TracebackScanOut TracebackScan deriving (Show)
newtype TracebackScanErr = TracebackScanErr TracebackScan deriving (Show)

data StackI = Daemon | Run | Listen | Progress | Power | Performance deriving (Eq)
instance Show StackI where
  show = \case
    Daemon -> "daemon"
    Run -> "cmd run"
    Listen -> "cmd listen -v"
    Progress -> "cmd listen -f progress"
    Power -> "cmd listen -f power"
    Performance -> "cmd listen -f performance"

runStack :: StackArgs -> Shell StackOutput
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runStack sa@StackArgs {..} = do
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  when verbose $ liftIO $ pPrint sa
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  when (powercap /= None) $ do
    user <- lineToText <$> single (inproc "whoami" [] empty)
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    chownPowercapFiles user
                       "/sys/devices/virtual/powercap/intel-rapl/intel-rapl:0"
    chownPowercapFiles user
                       "/sys/devices/virtual/powercap/intel-rapl/intel-rapl:1"
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  cleanLeftovers workingDirectory
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  mapM_ ($ coerce workingDirectory) [mktree, cd]
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  iDaemon <- case daemon of
    DontRun -> return Nothing
    JustRun stdOut stdErr ->
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      (\i -> Just (Daemon, i))
        <$> prepareDaemon stdOut stdErr Nothing verbosity powercap
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    Test t stdOut stdErr ->
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      (\i -> Just (Daemon, i))
        <$> prepareDaemon stdOut stdErr (Just t) Verbose powercap
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  let milist =
        [ iDaemon
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        , cmdRunI app args containerName shareDir manifestName vars cmdrun
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        , cmdListenI containerName cmdlisten
        , cmdListenPerformanceI containerName cmdlistenperformance
        , cmdListenProgressI containerName cmdlistenprogress
        , cmdListenPowerI containerName cmdlistenpower
        ]
      ilist = catMaybes milist

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  _ <- shell (coerce preludeCommand :: Text) empty >>= \case
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    ExitSuccess -> when verbose
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      $ printInfo ("Executed preludeCommand." <> repr preludeCommand)
    ExitFailure _ ->
      die ("failed to execute preludeCommand." <> repr preludeCommand)
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  when verbose $ do
    printInfo "Starting the following processes:"
    liftIO $ pPrint ilist
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  asyncs <- liftIO $ for ilist tupleToAsync
  _      <- liftIO $ kbInstallHandler $ for_ asyncs cancel
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  when verbose $ printInfo "Processes started."
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  out <- liftIO $ waitAnyCancel asyncs

  printInfo
    (  "Processes cancelled due to termination of: "
    <> repr (fst $ snd out)
    <> " with exit information: "
    <> repr (snd $ snd out)
    )

  tracebackList <- procsWithTracebacks ilist

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  r             <- case snd out of
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    (_, Left (PatternMatched line)) -> case tracebackList of
      [] -> return $ FoundMessage line
      t  -> return $ FoundTracebacks t
    (stacki, Right (errmsg, tracebackOut, tracebackErr)) -> return $ Died
      stacki
      errmsg
      (TracebackScanOut tracebackOut)
      (TracebackScanErr tracebackErr)
      tracebackList

  cd "../"
  return r
 where
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  chownPowercap user fn =
    shell (format ("sudo chown " % s % ":" % s % " " % s) user user fn) empty
      >>= \case
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            ExitSuccess   -> printWarning $ "changed ownership on " <> fn
            ExitFailure _ -> die $ "Couldn't change ownership on " <> fn
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  chownPowercapFiles user p =
    chownPowercap user (p <> "/constraint_1_power_limit_uw")
      <> chownPowercap user (p <> "/constraint_0_power_limit_uw")

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  verbose = verbosity == Verbose
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  procsWithTracebacks
    :: [(StackI, Instrumentation)] -> Shell [(StackI, Text, Text)]
  procsWithTracebacks ilist = fmap showOutputs <$> filterM (checkI . snd) ilist

  showOutputs :: (StackI, Instrumentation) -> (StackI, Text, Text)
  showOutputs (si, Instrumentation _ (StdOutLog outlog) (StdErrLog errlog) _) =
    (si, outlog, errlog)

  checkI :: Instrumentation -> Shell Bool
  checkI (Instrumentation _ (StdOutLog outlog) (StdErrLog errlog) _) = do
    b <- liftIO $ Turtle.Shell.fold
      (grep (has "Traceback") (input $ fromText outlog))
      Fold.length
    c <- liftIO $ Turtle.Shell.fold
      (grep (has "Traceback") (input $ fromText errlog))
      Fold.length
    return $ (b > 0) || (c > 0)

  tupleToAsync
    :: (StackI, Instrumentation)
    -> IO
         ( Async
             ( StackI
             , Either
                 MonitoringResult
                 (ExitCode, TracebackScan, TracebackScan)
             )
         )
  tupleToAsync (stacki, instrum) = async $ (stacki, ) <$> runI instrum