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{-# LANGUAGE OverloadedStrings, PackageImports, LambdaCase #-}
{-# LANGUAGE FlexibleContexts #-}
module Main where

import Data.List
import Control.Applicative
import Control.Arrow
import Control.Concurrent
import Control.Concurrent.Async
import Control.Monad
import Control.Monad.Reader

import System.Environment
import System.Exit
import System.Directory
import System.FilePath
import System.IO
import Control.Exception hiding (catch)
import Control.Monad.Trans.Control
import Control.Monad.Catch
import Control.DeepSeq
import qualified Data.Set as Set

import LambdaCube.Compiler.Pretty hiding ((</>))
import LambdaCube.Compiler.Driver
import LambdaCube.Compiler.CoreToIR
import IR (Backend(..))
import Text.Parsec.Pos

instance NFData SourcePos where
    rnf _ = ()

testDataPath = "./testdata"

data Res = Accepted | New | Rejected | Failed | ErrorCatched
    deriving (Eq, Ord, Show)

erroneous = (>= Rejected)

instance NFData Res where
    rnf a = a `seq` ()

optionArgs = ["-v", "-r","-notimeout"]

getDirectoryContentsRecursive path = do
  l <- map (path </>) . filter (\n -> notElem n [".",".."]) <$> getDirectoryContents path
  -- ignore sub directories that name include .ignore
  dirs <- filter (not . isInfixOf ".ignore") <$> filterM doesDirectoryExist l
  files <- filterM doesFileExist l
  innerContent <- mapM getDirectoryContentsRecursive dirs
  return $ concat $ (filter ((".lc" ==) . takeExtension) files) : innerContent

main :: IO ()
main = do
  hSetBuffering stdout NoBuffering
  hSetBuffering stdin NoBuffering
  args <- getArgs
  let samplesToAccept = filter (not . flip elem optionArgs) args
      verbose = elem "-v" args
      reject  = elem "-r" args
      timeout = if elem "-notimeout" args then 15 * 60 else 15 {- in seconds -}
  testData <- getDirectoryContentsRecursive testDataPath
  let (testToAccept,testToReject) = case samplesToAccept of
        [] ->
          let toAccept = map dropExtension . filter (\n -> ".lc" == takeExtensions n) $ testData
              toReject = map dropExtension . filter (\n -> ".reject.lc" == takeExtensions n) $ testData
          in (toAccept, toReject)
        _ ->
          let samples = Set.toList . Set.fromList $ concat [filter (isInfixOf s) testData | s <- samplesToAccept]
              toAccept = map dropExtension . filter (\n -> ".lc" == takeExtensions n) $ samples
              toReject = map dropExtension . filter (\n -> ".reject.lc" == takeExtensions n) $ samples
          in (toAccept, toReject)
  when (null $ testToAccept ++ testToReject) $ do
    liftIO $ putStrLn $ "test files not found: " ++ show samplesToAccept
    exitFailure

  n <- runMM' $ do
      liftIO $ putStrLn $ "------------------------------------ Checking valid pipelines"
      n1 <- acceptTests timeout reject testToAccept

      liftIO $ putStrLn $ "------------------------------------ Catching errors (must get an error)"
      n2 <- rejectTests timeout reject testToReject

      return $ n1 ++ n2

  let sh b ty = [(if erroneous ty then "!" else "") ++ show (length ss) ++ " " ++ pad 10 (b ++ ": ") ++ intercalate ", " ss | not $ null ss]
          where
            ss = sort [s | (ty', s) <- n, ty' == ty]
  let results = [t | (t,_) <- n]

  putStrLn $ "------------------------------------ Summary\n" ++
    if null n 
        then "All OK"
        else unlines $
            sh "crashed test" ErrorCatched
         ++ sh "failed test" Failed
         ++ sh "rejected result" Rejected
         ++ sh "new result" New
         ++ sh "accepted result" Accepted
  when (any erroneous results) exitFailure

acceptTests timeout reject = testFrame timeout reject [".",testDataPath] $ \case
    Left e -> Left e
    Right (fname, Left e, i) -> Right ("typechecked", unlines $ e: "tooltips:": [showRange (b, e) ++ "  " ++ m | (b, e, m) <- nub{-temporal; TODO: fail in case of duplicate items-} i, sourceName b == fname])
    Right (fname, Right e, i)
        | True <- i `deepseq` False -> error "impossible"
        | tyOf e == outputType
            -> Right ("compiled main", show . compilePipeline OpenGL33 $ e)
        | e == trueExp -> Right ("main ~~> True", ppShow e)
        | tyOf e == boolType -> Left $ "main should be True but it is \n" ++ ppShow e
        | otherwise -> Right ("reduced main " ++ ppShow (tyOf e), ppShow e)
--        | otherwise -> Right ("System-F main ", ppShow . toCore mempty $ e)

rejectTests timeout reject = testFrame timeout reject [".",testDataPath] $ \case
    Left e -> Right ("error message", e)
    Right _ -> Left "failed to catch error"

runMM' = fmap (either (error "impossible") id . fst) . runMM (ioFetch [])

testFrame :: Int -> Bool -> [FilePath] -> (Either String (FilePath, Either String Exp, Infos) -> Either String (String, String)) -> [String] -> MMT IO [(Res, String)]
testFrame timeout reject dirs f tests
    = local (const $ ioFetch dirs')
    $ testFrame_
        timeout
        (if reject then alwaysReject else compareResult)
        (head dirs')
        (\n -> f <$> (Right <$> getDef n "main" Nothing) `catchMM` (return . Left . show))
        tests
  where
    dirs_ = [takeDirectory f | f <- tests, takeFileName f /= f]
    dirs' = dirs ++ dirs_ -- if null dirs_ then dirs else dirs_


timeOut :: Int -> a -> MM a -> MM a
timeOut n d = mapMMT $ \m ->
  control (\runInIO ->
    race' (runInIO m)
          (threadDelay (n * 1000000) >> (runInIO $ return d)))
  where
    race' a b = either id id <$> race a b

testFrame_ timeout compareResult path action tests = fmap concat $ forM (zip [1..] (tests :: [String])) $ \(i, n) -> do
    let er e = do
            liftIO $ putStrLn $ "\n!Crashed " ++ n ++ "\n" ++ tab e
            return [(ErrorCatched, n)]
    catchErr er $ do
        result <- timeOut timeout (Left "Timed Out") (action n)
        liftIO $ case result of
          Left e -> do
            putStrLn $ "\n!Failed " ++ n ++ "\n" ++ tab e
            return [(Failed, n)]
          Right (op, x) -> do
            length x `seq` compareResult n (pad 15 op) (path </> (n ++ ".out")) x
  where
    tab = unlines . map ("  " ++) . lines

-- Reject unrigestered or chaned results automatically
alwaysReject n msg ef e = doesFileExist ef >>= \b -> case b of
    False -> putStrLn ("Unregistered - " ++ msg) >> return [(Rejected, n)]
    True -> do
        e' <- readFile ef
        case map fst $ filter snd $ zip [0..] $ zipWith (/=) e e' of
          [] -> return []
          rs -> do
            putStrLn $ msg ++ " has changed."
            putStrLn "------------------------------------------- Old"
            putStrLn $ showRanges ef rs e'
            putStrLn "------------------------------------------- New"
            putStrLn $ showRanges ef rs e
            putStrLn "-------------------------------------------"
            return [(Rejected, n)]

compareResult n msg ef e = doesFileExist ef >>= \b -> case b of
    False -> writeFile ef e >> putStrLn ("OK - " ++ msg ++ " is written") >> return [(New, n)]
    True -> do
        e' <- readFile ef
        case map fst $ filter snd $ zip [0..] $ zipWith (/=) e e' ++ replicate (abs $  length e - length e') True of
          [] -> return []
          rs -> do
            putStrLn $ msg ++ " has changed."
            putStrLn "------------------------------------------- Old"
            putStrLn $ showRanges ef rs e'
            putStrLn "------------------------------------------- New"
            putStrLn $ showRanges ef rs e
            putStrLn "-------------------------------------------"
            putStr $ "Accept new " ++ msg ++ " (y/n)? "
            c <- length e' `seq` getChar
            if c `elem` ("yY\n" :: String)
                then writeFile ef e >> putStrLn " - accepted." >> return [(Accepted, n)]
                else putStrLn " - not Accepted." >> return [(Rejected, n)]

pad n s = s ++ replicate (n - length s) ' '

limit :: String -> Int -> String -> String
limit msg n s = take n s ++ if null (drop n s) then "" else msg

showRanges :: String -> [Int] -> String -> String
showRanges fname is e = (if head rs == 0 then "" else "...\n")
    ++ limit ("\n... (see " ++ fname ++ " for more differences)") 140000 (intercalate "\n...\n" $ f (zipWith (-) rs (0:rs)) e)
  where
    f :: [Int] -> String -> [String]
    f (i:is) e = g is $ drop i e
    f [] "" = []
    f [] _ = ["\n..."]
    g (i:is) e = take i e: f is (drop i e)
    rs = (head is - x) : concat [[a + x, b - x] | (a, b) <- zip is (tail is), a + y < b] ++ [last is + x]
    x = 100000
    y = 3*x