{-# LANGUAGE DeriveDataTypeable, CPP #-}
{- |

shelltest - for testing command-line programs. See shelltestrunner.cabal.
(c) Simon Michael 2009-2017, released under GNU GPLv3 or later.

-}

module Main
where

import Control.Concurrent (forkIO)
import Control.Concurrent.MVar (newEmptyMVar, putMVar, takeMVar)
import Data.Algorithm.Diff
import System.Console.CmdArgs
import System.Directory (doesDirectoryExist)
import System.FilePath (takeDirectory)
import System.FilePath.Find (findWithHandler, (==?), always)
import qualified System.FilePath.Find as Find (extension)
import System.IO (Handle, hGetContents, hPutStr)
import System.Process (StdStream (CreatePipe), shell, createProcess, CreateProcess (..), waitForProcess, ProcessHandle)
import Test.Framework (defaultMainWithArgs)
import Test.Framework.Providers.HUnit (hUnitTestToTests)
import Test.HUnit
import Text.Parsec

import Import
import Utils
import Types
import Parse
import Preprocessor


progname, progversion :: String
progname = "shelltest"
progversion = progname ++ " " ++ "1.9"
proghelpsuffix :: [String]
proghelpsuffix = [
   "shelltest file formats, tried in this order:"
  ,""
  ,"Description                                            Delimiters, in order"    
  ,"------------------------------------------------------ ------------------------"
  ,"v2 input then multiple tests; some delimiters optional <<<    $$$ >>> >>>2 >>>="
  ,"v3 same as v2, but with short delimiters               <      $   >   >2   >="  
  ,"v1 command first; exit status is required              (none) <<< >>> >>>2 >>>="
  ,""
  ]

data Args = Args {
     list        :: Bool
    ,all_        :: Bool
    ,color       :: Bool
    ,diff        :: Bool
    ,precise     :: Bool
    ,hide_successes :: Bool
    ,xmlout      :: String
    ,defmacro    :: [String]
    ,include     :: [String]
    ,exclude     :: [String]
    ,execdir     :: Bool
    ,extension   :: String
    ,with        :: String
    ,timeout     :: Int
    ,threads     :: Int
    ,debug       :: Bool
    ,debug_parse :: Bool
    ,testpaths   :: [FilePath]
    } deriving (Show, Data, Typeable)

argdefs = Args {
     list        = def     &= help "List all parsed tests and stop"
    ,all_        = def     &= help "Don't truncate output, even if large"
    ,color       = def     &= help "Show colored output if your terminal supports it"
    ,diff        = def     &= name "d" &= help "Show expected output mismatches in diff format"
    ,precise     = def     &= help "Show expected/actual output precisely (eg whitespace)"
    ,hide_successes = def  &= help "Show only test failures"
    ,xmlout      = def     &= typ "FILE" &= help "Specify file to store test results in xml format."
    ,defmacro    = def  &= name "D" &= typ "D=DEF" &= help "Specify a macro that is evaluated by preprocessor before the test files are parsed. D stands for macro definition that is replaced with the value of DEF."
    ,include     = def     &= name "i" &= typ "PAT" &= help "Include tests whose name contains this glob pattern"
    ,exclude     = def     &= name "x" &= typ "STR" &= help "Exclude test files whose path contains STR"
    ,execdir     = def     &= help "Run tests from within the test file's directory"
    ,extension   = ".test" &= typ "EXT" &= help "File suffix of test files (default: .test)"
    ,with        = def     &= typ "EXECUTABLE" &= help "Replace the first word of (unindented) test commands"
    ,timeout     = def     &= name "o" &= typ "SECS" &= help "Number of seconds a test may run (default: no limit)"
    ,threads     = def     &= name "j" &= typ "N" &= help "Number of threads for running tests (default: 1)"
    ,debug       = def     &= help "Show debug info, for troubleshooting"
    ,debug_parse = def     &= help "Show test file parsing info and stop"
    ,testpaths   = def     &= args &= typ "TESTFILES|TESTDIRS"
    }
    &= program progname
    &= summary progversion
    &= details proghelpsuffix

main :: IO ()
main = do
  -- parse args
  args' <- cmdArgs argdefs >>= checkArgs
  -- some of the cmdargs-parsed "arguments" may be test-framework options following --,
  -- separate those out
  let (tfopts', realargs) = partition ("-" `isPrefixOf`) $ testpaths args'
      args = args'{testpaths=realargs}
      tfopts = tfopts'
               ++ (if list args then ["--list"] else [])
               ++ (if color args then [] else ["--plain"])
               ++ (if hide_successes args then ["--hide-successes"] else [])
               ++ (["--select-tests="++s | s <- include args])
               ++ (if timeout args > 0 then ["--timeout=" ++ show (timeout args)] else [])
               ++ (if threads args > 0 then ["--threads=" ++ show (threads args)] else [])
               ++ (if not (xmlout args == []) then ["--jxml=" ++ (xmlout args)] else [])


  when (debug args) $ printf "%s\n" progversion >> printf "args: %s\n" (ppShow args)

  -- gather test files
  testfiles' <- nub . concat <$> mapM
                                 (\p -> do
                                     isdir <- doesDirectoryExist p
                                     if isdir
                                       then findWithHandler (\_ e->fail (show e)) always (Find.extension ==? extension args) p
                                       else return [p])
                                 (testpaths args)
  let testfiles = filter (not . \p -> any (`isInfixOf` p) (exclude args)) testfiles'
      excluded = length testfiles' - length testfiles
      macros = (getMacros (defmacro args))
      preprocessor = createMacroPreProcessor macros
  when (excluded > 0) $ printf "Excluding %d test files\n" excluded

  -- parse test files
  when (debug args) $ printf "processing %d test files: %s\n" (length testfiles) (intercalate ", " testfiles)
  parseresults <- mapM (parseShellTestFile (debug args || debug_parse args) preprocessor) testfiles

  -- run tests
  when (debug args) $ printf "running tests:\n"
  unless (debug_parse args) $
    defaultMainWithArgs (concatMap (hUnitTestToTests . testFileParseToHUnitTest args) parseresults) tfopts

-- | Additional argument checking.
checkArgs :: Args -> IO Args
checkArgs args = do
  when (null $ testpaths args) $
       warn $ printf "Please specify at least one test file or directory, eg: %s tests" progname
  return args

-- | Show a message, usage string, and terminate with exit status 1.
warn :: String -> IO ()
warn s = putStrLn s >> exitWith (ExitFailure 1)


-- running tests

testFileParseToHUnitTest :: Args -> Either ParseError [ShellTest] -> Test.HUnit.Test
testFileParseToHUnitTest args (Right ts) = TestList $ map (shellTestToHUnitTest args) ts
testFileParseToHUnitTest _ (Left e) = ("parse error in " ++ (sourceName $ errorPos e)) ~: (assertFailure :: (String -> IO ())) $ show e

shellTestToHUnitTest :: Args -> ShellTest -> Test.HUnit.Test
shellTestToHUnitTest args ShellTest{testname=n,command=c,stdin=i,stdoutExpected=o_expected,
                                    stderrExpected=e_expected,exitCodeExpected=x_expected} =
 n ~: do
  let e = with args
      cmd = case (e,c) of (_:_, ReplaceableCommand s) -> e ++ " " ++ dropWhile (/=' ') s
                          (_, ReplaceableCommand s)   -> s
                          (_, FixedCommand s)         -> s
      dir = if execdir args then Just $ takeDirectory n else Nothing
      trim' = if all_ args then id else trim
  when (debug args) $ do
    printf "actual command was: %s\n" (show cmd)
  (o_actual, e_actual, x_actual) <- runCommandWithInput dir cmd i
  when (debug args) $ do
    printf "actual stdout was : %s\n" (show $ trim' o_actual)
    printf "actual stderr was : %s\n" (show $ trim' e_actual)
    printf "actual exit was   : %s\n" (trim' $ show x_actual)
  let outputMatch = maybe True (o_actual `matches`) o_expected
  let errorMatch = maybe True (e_actual `matches`) e_expected
  let exitCodeMatch = show x_actual `matches` x_expected
  if (x_actual == 127) -- catch bad executable - should work on posix systems at least
   then ioError $ userError $ unwords $ filter (not . null) [e_actual, printf "Command: '%s' Exit code: %i" cmd x_actual] -- XXX still a test failure; should be an error
   else assertString $ concat $ filter (not . null) [
             if any not [outputMatch, errorMatch, exitCodeMatch]
               then printf "Command:\n%s\n" cmd
               else ""
            ,if outputMatch
              then ""
              else showExpectedActual args "stdout"    (fromJust o_expected) o_actual
            ,if errorMatch
              then ""
              else showExpectedActual args "stderr"    (fromJust e_expected) e_actual
            ,if exitCodeMatch
              then ""
              else showExpectedActual args{diff=False} "exit code" x_expected (show x_actual)
            ]

-- | Run a shell command line, passing it standard input if provided,
-- and return the standard output, standard error output and exit code.
-- Note on unix, at least with ghc 6.12, command (and filepath) are assumed to be utf8-encoded.
runCommandWithInput :: Maybe FilePath -> String -> Maybe String -> IO (String, String, Int)
runCommandWithInput wd cmd input = do
  -- this has to be done carefully
  (ih,oh,eh,ph) <- runInteractiveCommandInDir wd cmd
  when (isJust input) $ forkIO (hPutStr ih $ fromJust input) >> return ()
  o <- newEmptyMVar
  e <- newEmptyMVar
  forkIO $ oh `hGetContentsStrictlyAnd` putMVar o
  forkIO $ eh `hGetContentsStrictlyAnd` putMVar e
  x_actual <- waitForProcess ph >>= return.fromExitCode
  o_actual <- takeMVar o
  e_actual <- takeMVar e
  return (o_actual, e_actual, x_actual)

runInteractiveCommandInDir :: Maybe FilePath -> String ->  IO (Handle, Handle, Handle, ProcessHandle)
runInteractiveCommandInDir wd cmd = do
   (mb_in, mb_out, mb_err, p) <-
      createProcess $
         (shell cmd) { cwd = wd
                     , std_in  = CreatePipe
                     , std_out = CreatePipe
                     , std_err = CreatePipe }
   return (fromJust mb_in, fromJust mb_out, fromJust mb_err, p)

hGetContentsStrictlyAnd :: Handle -> (String -> IO b) -> IO b
hGetContentsStrictlyAnd h f = hGetContents h >>= \s -> length s `seq` f s

matches :: String -> Matcher -> Bool
matches s (PositiveRegex r)   = s `containsRegex` r
matches s (NegativeRegex r)   = not $ s `containsRegex` r
matches s (Numeric p)         = s == p
matches s (NegativeNumeric p) = not $ s == p
matches s (Lines _ p)         = s == p

showExpectedActual :: Args -> String -> Matcher -> String -> String
showExpectedActual args@Args{diff=True} _ (Lines ln e) a =
    printf "--- Expected\n+++ Got\n" ++ showDiff args(1,ln) (getDiff (lines a) (lines e))
showExpectedActual Args{all_=all_,precise=precise} field e a =
    printf "Expected %s: %s\nGot %s:      %s" field (show' $ showm e) field (show' $ trim' a)
    where
      show' = if precise then show else ("\n"++)
      showm = if all_ then showMatcher else showMatcherTrimmed
      trim' = if all_ then id else trim

showDiff :: Args -> (Int,Int) -> [(Diff String)] -> String
showDiff _ _ []                   = ""
showDiff args@Args{all_=all_,precise=precise} (l,r) ((First ln) : ds) =
    printf "+%4d " l ++ ln' ++ "\n" ++ showDiff args (l+1,r) ds
    where
      ln' = trim' $ show' ln
      trim' = if all_ then id else trim
      show' = if precise then show else id
showDiff args@Args{all_=all_,precise=precise} (l,r) ((Second ln) : ds) =
    printf "-%4d " r ++ ln' ++ "\n" ++ showDiff args (l,r+1) ds
    where
      ln' = trim' $ show' ln
      trim' = if all_ then id else trim
      show' = if precise then show else id
showDiff args (l,r) ((Both _ _) : ds) = showDiff args (l+1,r+1) ds