{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeApplications #-}

-- | Swarm integration tests
module Main where

import Control.Lens (Ixed (ix), to, use, view, (&), (.~), (<&>), (<>~), (^.), (^..), (^?!))
import Control.Monad (filterM, forM_, unless, when)
import Control.Monad.State (StateT (runStateT), gets)
import Control.Monad.Trans.Except (runExceptT)
import Data.Char (isSpace)
import Data.Containers.ListUtils (nubOrd)
import Data.Foldable (Foldable (toList), find)
import Data.IntSet qualified as IS
import Data.List (partition)
import Data.Map qualified as M
import Data.Maybe (isJust)
import Data.Sequence (Seq)
import Data.Text (Text)
import Data.Text qualified as T
import Data.Text.IO qualified as T
import Data.Yaml (ParseException, prettyPrintParseException)
import Swarm.DocGen (EditorType (..))
import Swarm.DocGen qualified as DocGen
import Swarm.Game.CESK (emptyStore, initMachine)
import Swarm.Game.Entity (EntityMap, loadEntities, lookupByName)
import Swarm.Game.Robot (LogEntry, defReqs, equippedDevices, leText, machine, robotContext, robotLog, waitingUntil)
import Swarm.Game.Scenario (Scenario)
import Swarm.Game.State (
  GameState,
  WinCondition (WinConditions),
  WinStatus (Won),
  activeRobots,
  baseRobot,
  initGameStateForScenario,
  messageQueue,
  robotMap,
  ticks,
  waitingRobots,
  winCondition,
  winSolution,
 )
import Swarm.Game.Step (gameTick)
import Swarm.Language.Context qualified as Ctx
import Swarm.Language.Pipeline (ProcessedTerm (..), processTerm)
import Swarm.Util.Yaml (decodeFileEitherE)
import System.Directory (doesDirectoryExist, doesFileExist, listDirectory)
import System.Environment (getEnvironment)
import System.FilePath (splitDirectories)
import System.FilePath.Posix (takeExtension, (</>))
import System.Timeout (timeout)
import Test.Tasty (TestTree, defaultMain, testGroup)
import Test.Tasty.HUnit (Assertion, assertBool, assertFailure, testCase)
import Witch (into)

isUnparseableTest :: (FilePath, String) -> Bool
isUnparseableTest (fp, _) = "_Validation" `elem` splitDirectories fp

main :: IO ()
main = do
  examplePaths <- acquire "example" "sw"
  scenarioPaths <- acquire "data/scenarios" "yaml"
  let (unparseableScenarios, parseableScenarios) = partition isUnparseableTest scenarioPaths
  scenarioPrograms <- acquire "data/scenarios" "sw"
  ci <- any (("CI" ==) . fst) <$> getEnvironment
  entities <- loadEntities
  case entities of
    Left t -> fail $ "Couldn't load entities: " <> into @String t
    Right em -> do
      defaultMain $
        testGroup
          "Tests"
          [ exampleTests examplePaths
          , exampleTests scenarioPrograms
          , scenarioParseTests em parseableScenarios
          , scenarioParseInvalidTests em unparseableScenarios
          , testScenarioSolution ci em
          , testEditorFiles
          ]

exampleTests :: [(FilePath, String)] -> TestTree
exampleTests inputs = testGroup "Test example" (map exampleTest inputs)

exampleTest :: (FilePath, String) -> TestTree
exampleTest (path, fileContent) =
  testCase ("processTerm for contents of " ++ show path) $ do
    either (assertFailure . into @String) (const . return $ ()) value
 where
  value = processTerm $ into @Text fileContent

scenarioParseTests :: EntityMap -> [(FilePath, String)] -> TestTree
scenarioParseTests em inputs =
  testGroup
    "Test scenarios parse"
    (map (scenarioTest Parsed em) inputs)

scenarioParseInvalidTests :: EntityMap -> [(FilePath, String)] -> TestTree
scenarioParseInvalidTests em inputs =
  testGroup
    "Test invalid scenarios fail to parse"
    (map (scenarioTest Failed em) inputs)

data ParseResult = Parsed | Failed

scenarioTest :: ParseResult -> EntityMap -> (FilePath, String) -> TestTree
scenarioTest expRes em (path, _) =
  testCase ("parse scenario " ++ show path) (getScenario expRes em path)

getScenario :: ParseResult -> EntityMap -> FilePath -> IO ()
getScenario expRes em p = do
  res <- decodeFileEitherE em p :: IO (Either ParseException Scenario)
  case expRes of
    Parsed -> case res of
      Left err -> assertFailure (prettyPrintParseException err)
      Right _s -> return ()
    Failed -> case res of
      Left _err -> return ()
      Right _s -> assertFailure "Unexpectedly parsed invalid scenario!"

acquire :: FilePath -> String -> IO [(FilePath, String)]
acquire dir ext = do
  paths <- listDirectory dir <&> map (dir </>)
  filePaths <- filterM (\path -> doesFileExist path <&> (&&) (hasExt path)) paths
  children <- mapM (\path -> (,) path <$> readFile path) filePaths
  -- recurse
  sub <- filterM doesDirectoryExist paths
  transChildren <- concat <$> mapM (`acquire` ext) sub
  return $ children <> transChildren
 where
  hasExt path = takeExtension path == ("." ++ ext)

data Time
  = -- | One second should be enough to run most programs.
    Default
  | -- | You can specify more seconds if you need to.
    Sec Int
  | -- | If you absolutely have to, you can ignore timeout.
    None

time :: Time -> Int
time = \case
  Default -> 1 * sec
  Sec s -> s * sec
  None -> -1
 where
  sec :: Int
  sec = 10 ^ (6 :: Int)

data ShouldCheckBadErrors = CheckForBadErrors | AllowBadErrors deriving (Eq, Show)

testScenarioSolution :: Bool -> EntityMap -> TestTree
testScenarioSolution _ci _em =
  testGroup
    "Test scenario solutions"
    [ testGroup
        "Tutorial"
        [ testTutorialSolution Default "Tutorials/backstory"
        , testTutorialSolution (Sec 3) "Tutorials/move"
        , testTutorialSolution Default "Tutorials/craft"
        , testTutorialSolution Default "Tutorials/grab"
        , testTutorialSolution Default "Tutorials/place"
        , testTutorialSolution Default "Tutorials/types"
        , testTutorialSolution Default "Tutorials/type-errors"
        , testTutorialSolution Default "Tutorials/equip"
        , testTutorialSolution Default "Tutorials/build"
        , testTutorialSolution Default "Tutorials/bind2"
        , testTutorialSolution' Default "Tutorials/crash" CheckForBadErrors $ \g -> do
            let rs = toList $ g ^. robotMap
            let hints = any (T.isInfixOf "you will win" . view leText) . toList . view robotLog
            let win = isJust $ find hints rs
            assertBool "Could not find a robot with winning instructions!" win
        , testTutorialSolution Default "Tutorials/scan"
        , testTutorialSolution Default "Tutorials/def"
        , testTutorialSolution Default "Tutorials/lambda"
        , testTutorialSolution Default "Tutorials/require"
        , testTutorialSolution (Sec 3) "Tutorials/requireinv"
        , testTutorialSolution Default "Tutorials/conditionals"
        , testTutorialSolution (Sec 5) "Tutorials/farming"
        ]
    , testGroup
        "Challenges"
        [ testSolution Default "Challenges/chess_horse"
        , testSolution Default "Challenges/teleport"
        , testSolution (Sec 5) "Challenges/2048"
        , testSolution (Sec 3) "Challenges/word-search"
        , testSolution (Sec 3) "Challenges/ice-cream"
        , testSolution (Sec 10) "Challenges/hanoi"
        , testSolution Default "Challenges/friend"
        , testGroup
            "Mazes"
            [ testSolution Default "Challenges/Mazes/easy_cave_maze"
            , testSolution Default "Challenges/Mazes/easy_spiral_maze"
            , testSolution Default "Challenges/Mazes/invisible_maze"
            , testSolution Default "Challenges/Mazes/loopy_maze"
            ]
        , testGroup
            "Ranching"
            [ testSolution (Sec 30) "Challenges/Ranching/gated-paddock"
            ]
        ]
    , testGroup
        "Regression tests"
        [ testSolution Default "Testing/394-build-drill"
        , testSolution Default "Testing/373-drill"
        , testSolution Default "Testing/428-drowning-destroy"
        , testSolution' Default "Testing/475-wait-one" CheckForBadErrors $ \g -> do
            let t = g ^. ticks
                r1Waits = g ^?! robotMap . ix 1 . to waitingUntil
                active = IS.member 1 $ g ^. activeRobots
                waiting = elem 1 . concat . M.elems $ g ^. waitingRobots
            assertBool "The game should only take two ticks" $ t == 2
            assertBool "Robot 1 should have waiting machine" $ isJust r1Waits
            assertBool "Robot 1 should be still active" active
            assertBool "Robot 1 should not be in waiting set" $ not waiting
        , testSolution Default "Testing/490-harvest"
        , testSolution Default "Testing/504-teleport-self"
        , testSolution Default "Testing/508-capability-subset"
        , testGroup
            "Possession criteria (#858)"
            [ testSolution Default "Testing/858-inventory/858-possession-objective"
            , testSolution Default "Testing/858-inventory/858-counting-objective"
            , testSolution Default "Testing/858-inventory/858-nonpossession-objective"
            ]
        , testGroup
            "Require (#201)"
            [ testSolution Default "Testing/201-require/201-require-device"
            , testSolution Default "Testing/201-require/201-require-device-creative"
            , testSolution Default "Testing/201-require/201-require-device-creative1"
            , testSolution Default "Testing/201-require/201-require-entities"
            , testSolution Default "Testing/201-require/201-require-entities-def"
            , testSolution Default "Testing/201-require/533-reprogram-simple"
            , testSolution Default "Testing/201-require/533-reprogram"
            ]
        , testSolution Default "Testing/479-atomic-race"
        , testSolution (Sec 5) "Testing/479-atomic"
        , testSolution Default "Testing/555-teleport-location"
        , testSolution Default "Testing/562-lodestone"
        , testSolution Default "Testing/378-objectives"
        , testSolution Default "Testing/684-swap"
        , testSolution Default "Testing/699-movement-fail/699-move-blocked"
        , testSolution Default "Testing/699-movement-fail/699-move-liquid"
        , testSolution Default "Testing/699-movement-fail/699-teleport-blocked"
        , testSolution Default "Testing/710-multi-robot"
        , testSolution Default "Testing/920-meet"
        , testSolution Default "Testing/955-heading"
        , testSolution' Default "Testing/397-wrong-missing" CheckForBadErrors $ \g -> do
            let msgs =
                  (g ^. messageQueue . to seqToTexts)
                    <> (g ^.. robotMap . traverse . robotLog . to seqToTexts . traverse)

            assertBool "Should be some messages" (not (null msgs))
            assertBool "Error messages should not mention treads" $
              not (any ("treads" `T.isInfixOf`) msgs)
            assertBool "Error message should mention GPS receiver" $
              any ("GPS receiver" `T.isInfixOf`) msgs
        , testSolution Default "Testing/961-custom-capabilities"
        , testSolution Default "Testing/956-GPS"
        , testSolution Default "Testing/958-isempty"
        ]
    ]
 where
  -- expectFailIf :: Bool -> String -> TestTree -> TestTree
  -- expectFailIf b = if b then expectFailBecause else (\_ x -> x)

  testSolution :: Time -> FilePath -> TestTree
  testSolution s p = testSolution' s p CheckForBadErrors (const $ pure ())

  testSolution' :: Time -> FilePath -> ShouldCheckBadErrors -> (GameState -> Assertion) -> TestTree
  testSolution' s p shouldCheckBadErrors verify = testCase p $ do
    out <- runExceptT $ initGameStateForScenario p Nothing Nothing
    case out of
      Left x -> assertFailure $ unwords ["Failure in initGameStateForScenario:", T.unpack x]
      Right gs -> case gs ^. winSolution of
        Nothing -> assertFailure "No solution to test!"
        Just sol@(ProcessedTerm _ _ reqCtx) -> do
          let gs' =
                gs
                  -- See #827 for an explanation of why it's important to add to
                  -- the robotContext defReqs here (and also why this will,
                  -- hopefully, eventually, go away).
                  & baseRobot . robotContext . defReqs <>~ reqCtx
                  & baseRobot . machine .~ initMachine sol Ctx.empty emptyStore
          m <- timeout (time s) (snd <$> runStateT playUntilWin gs')
          case m of
            Nothing -> assertFailure "Timed out - this likely means that the solution did not work."
            Just g -> do
              -- When debugging, try logging all robot messages.
              -- printAllLogs
              when (shouldCheckBadErrors == CheckForBadErrors) $ noBadErrors g
              verify g

  tutorialHasLog :: GameState -> Assertion
  tutorialHasLog gs =
    let baseDevs = gs ^?! baseRobot . equippedDevices
     in assertBool "Base should have a logger installed!" (not . null $ lookupByName "logger" baseDevs)

  testTutorialSolution t f = testSolution' t f CheckForBadErrors tutorialHasLog
  testTutorialSolution' t f s v = testSolution' t f s $ \g -> tutorialHasLog g >> v g

  playUntilWin :: StateT GameState IO ()
  playUntilWin = do
    w <- use winCondition
    b <- gets badErrorsInLogs
    when (null b) $ case w of
      WinConditions (Won _) _ -> return ()
      _ -> gameTick >> playUntilWin

noBadErrors :: GameState -> Assertion
noBadErrors g = do
  let bad = badErrorsInLogs g
  unless (null bad) (assertFailure . T.unpack . T.unlines . take 5 $ nubOrd bad)

badErrorsInLogs :: GameState -> [Text]
badErrorsInLogs g =
  concatMap
    (\r -> filter isBad (seqToTexts $ r ^. robotLog))
    (g ^. robotMap)
    <> filter isBad (seqToTexts $ g ^. messageQueue)
 where
  isBad m = "Fatal error:" `T.isInfixOf` m || "swarm/issues" `T.isInfixOf` m

seqToTexts :: Seq LogEntry -> [Text]
seqToTexts = map (view leText) . toList

printAllLogs :: GameState -> IO ()
printAllLogs g =
  mapM_
    (\r -> forM_ (r ^. robotLog) (putStrLn . T.unpack . view leText))
    (g ^. robotMap)

-- | Test that editor files are up-to-date.
testEditorFiles :: TestTree
testEditorFiles =
  testGroup
    "editors"
    [ testGroup
        "VS Code"
        [ testTextInVSCode "operators" (const DocGen.operatorNames)
        , testTextInVSCode "builtin" DocGen.builtinFunctionList
        , testTextInVSCode "commands" DocGen.keywordsCommands
        , testTextInVSCode "directions" DocGen.keywordsDirections
        ]
    , testGroup
        "Emacs"
        [ testTextInEmacs "builtin" DocGen.builtinFunctionList
        , testTextInEmacs "commands" DocGen.keywordsCommands
        , testTextInEmacs "directions" DocGen.keywordsDirections
        ]
    ]
 where
  testTextInVSCode name tf = testTextInFile False name (tf VSCode) "editors/vscode/syntaxes/swarm.tmLanguage.json"
  testTextInEmacs name tf = testTextInFile True name (tf Emacs) "editors/emacs/swarm-mode.el"
  testTextInFile :: Bool -> String -> Text -> FilePath -> TestTree
  testTextInFile whitespace name t fp = testCase name $ do
    let removeLW' = T.unlines . map (T.dropWhile isSpace) . T.lines
        removeLW = if whitespace then removeLW' else id
    f <- T.readFile fp
    assertBool
      ( "EDITOR FILE IS NOT UP TO DATE!\n"
          <> "I could not find the text:\n"
          <> T.unpack t
          <> "\nin file "
          <> fp
      )
      (removeLW t `T.isInfixOf` removeLW f)