-----------------------------------------------------------------------------
-- |
-- Module      :  Distribution.Simple.Test
-- Copyright   :  Thomas Tuegel 2010
--
-- Maintainer  :  cabal-devel@haskell.org
-- Portability :  portable
--
-- This is the entry point into testing a built package. It performs the
-- \"@.\/setup test@\" action. It runs test suites designated in the package
-- description and reports on the results.

{- All rights reserved.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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module Distribution.Simple.Test
    ( test
    , runTests
    , writeSimpleTestStub
    , stubFilePath
    , stubName
    , PackageLog(..)
    , TestSuiteLog(..)
    , Case(..)
    , suitePassed, suiteFailed, suiteError
    ) where

import Distribution.Compat.TempFile ( openTempFile )
import Distribution.ModuleName ( ModuleName )
import Distribution.Package
    ( PackageId )
import qualified Distribution.PackageDescription as PD
         ( PackageDescription(..), TestSuite(..)
         , TestSuiteInterface(..), testType, hasTests )
import Distribution.Simple.Build.PathsModule ( pkgPathEnvVar )
import Distribution.Simple.BuildPaths ( exeExtension )
import Distribution.Simple.Compiler ( Compiler(..), CompilerId )
import Distribution.Simple.InstallDirs
    ( fromPathTemplate, initialPathTemplateEnv, PathTemplateVariable(..)
    , substPathTemplate , toPathTemplate, PathTemplate )
import qualified Distribution.Simple.LocalBuildInfo as LBI
    ( LocalBuildInfo(..) )
import Distribution.Simple.Setup ( TestFlags(..), TestShowDetails(..), fromFlag )
import Distribution.Simple.Utils ( die, notice )
import qualified Distribution.TestSuite as TestSuite
    ( Test, Result(..), ImpureTestable(..), TestOptions(..), Options(..) )
import Distribution.Text
import Distribution.Verbosity ( normal, Verbosity )
import Distribution.System ( buildPlatform, Platform )

import Control.Exception ( bracket )
import Control.Monad ( when, liftM, unless, filterM )
import Data.Char ( toUpper )
import Data.Monoid ( mempty )
import System.Directory
    ( createDirectoryIfMissing, doesFileExist, getCurrentDirectory
    , removeFile, getDirectoryContents )
import System.Environment ( getEnvironment )
import System.Exit ( ExitCode(..), exitFailure, exitWith )
import System.FilePath ( (</>), (<.>) )
import System.IO ( hClose, IOMode(..), openFile )
import System.Process ( runProcess, waitForProcess )

-- | Logs all test results for a package, broken down first by test suite and
-- then by test case.
data PackageLog = PackageLog
    { package :: PackageId
    , compiler :: CompilerId
    , platform :: Platform
    , testSuites :: [TestSuiteLog]
    }
    deriving (Read, Show, Eq)

-- | A 'PackageLog' with package and platform information specified.
localPackageLog :: PD.PackageDescription -> LBI.LocalBuildInfo -> PackageLog
localPackageLog pkg_descr lbi = PackageLog
    { package = PD.package pkg_descr
    , compiler = compilerId $ LBI.compiler lbi
    , platform = buildPlatform
    , testSuites = []
    }

-- | Logs test suite results, itemized by test case.
data TestSuiteLog = TestSuiteLog
    { name :: String
    , cases :: [Case]
    , logFile :: FilePath    -- path to human-readable log file
    }
    deriving (Read, Show, Eq)

data Case = Case
    { caseName :: String
    , caseOptions :: TestSuite.Options
    , caseResult :: TestSuite.Result
    }
    deriving (Read, Show, Eq)

getTestOptions :: TestSuite.Test -> TestSuiteLog -> IO TestSuite.Options
getTestOptions t l =
    case filter ((== TestSuite.name t) . caseName) (cases l) of
        (x:_) -> return $ caseOptions x
        _ -> TestSuite.defaultOptions t

-- | From a 'TestSuiteLog', determine if the test suite passed.
suitePassed :: TestSuiteLog -> Bool
suitePassed = all (== TestSuite.Pass) . map caseResult . cases

-- | From a 'TestSuiteLog', determine if the test suite failed.
suiteFailed :: TestSuiteLog -> Bool
suiteFailed = any isFail . map caseResult . cases
    where isFail (TestSuite.Fail _) = True
          isFail _ = False

-- | From a 'TestSuiteLog', determine if the test suite encountered errors.
suiteError :: TestSuiteLog -> Bool
suiteError = any isError . map caseResult . cases
    where isError (TestSuite.Error _) = True
          isError _ = False

-- | Run a test executable, logging the output and generating the appropriate
-- summary messages.
testController :: TestFlags
               -- ^ flags Cabal was invoked with
               -> PD.PackageDescription
               -- ^ description of package the test suite belongs to
               -> LBI.LocalBuildInfo
               -- ^ information from the configure step
               -> PD.TestSuite
               -- ^ TestSuite being tested
               -> (FilePath -> String)
               -- ^ prepare standard input for test executable
               -> FilePath -- ^ executable name
               -> (ExitCode -> String -> TestSuiteLog)
               -- ^ generator for the TestSuiteLog
               -> (TestSuiteLog -> FilePath)
               -- ^ generator for final human-readable log filename
               -> IO TestSuiteLog
testController flags pkg_descr lbi suite preTest cmd postTest logNamer = do
    let distPref = fromFlag $ testDistPref flags
        verbosity = fromFlag $ testVerbosity flags
        testLogDir = distPref </> "test"
        optionTemplates = fromFlag $ testOptions flags
        options = map (testOption pkg_descr lbi suite) optionTemplates

    pwd <- getCurrentDirectory
    existingEnv <- getEnvironment
    let dataDirPath = pwd </> PD.dataDir pkg_descr
        shellEnv = Just $ (pkgPathEnvVar pkg_descr "datadir", dataDirPath)
                        : existingEnv

    bracket (openCabalTemp testLogDir) deleteIfExists $ \tempLog ->
        bracket (openCabalTemp testLogDir) deleteIfExists $ \tempInput -> do

            -- Write summary notices indicating start of test suite
            notice verbosity $ summarizeSuiteStart $ PD.testName suite
            appendFile tempLog $ summarizeSuiteStart $ PD.testName suite

            -- Prepare standard input for test executable
            appendFile tempInput $ preTest tempInput

            -- Run test executable
            exit <- do
              hLog <- openFile tempLog AppendMode
              hIn  <- openFile tempInput ReadMode
              -- these handles get closed by runProcess
              proc <- runProcess cmd options Nothing shellEnv
                        (Just hIn) (Just hLog) (Just hLog)
              waitForProcess proc

            -- Generate TestSuiteLog from executable exit code and a machine-
            -- readable test log
            suiteLog <- readFile tempInput >>= return . postTest exit

            -- Generate final log file name
            let finalLogName = testLogDir </> logNamer suiteLog
                suiteLog' = suiteLog { logFile = finalLogName }

            -- Write summary notice to log file indicating end of test suite
            appendFile tempLog $ summarizeSuiteFinish suiteLog'

            -- Append contents of temporary log file to the final human-
            -- readable log file
            readFile tempLog >>= appendFile (logFile suiteLog')

            -- Show the contents of the human-readable log file on the terminal
            -- if there is a failure and/or detailed output is requested
            let details = fromFlag $ testShowDetails flags
                whenPrinting = when $ (details > Never)
                    && (not (suitePassed suiteLog) || details == Always)
                    && verbosity >= normal
            whenPrinting $ readFile (logFile suiteLog') >>=
                putStr . unlines . map (">>> " ++) . lines

            -- Write summary notice to terminal indicating end of test suite
            notice verbosity $ summarizeSuiteFinish suiteLog'

            return suiteLog'
    where
        deleteIfExists file = do
            exists <- doesFileExist file
            when exists $ removeFile file

        openCabalTemp testLogDir = do
            (f, h) <- openTempFile testLogDir $ "cabal-test-" <.> "log"
            hClose h >> return f


-- |Perform the \"@.\/setup test@\" action.
test :: PD.PackageDescription   -- ^information from the .cabal file
     -> LBI.LocalBuildInfo      -- ^information from the configure step
     -> TestFlags               -- ^flags sent to test
     -> IO ()
test pkg_descr lbi flags = do
    let verbosity = fromFlag $ testVerbosity flags
        humanTemplate = fromFlag $ testHumanLog flags
        machineTemplate = fromFlag $ testMachineLog flags
        distPref = fromFlag $ testDistPref flags
        testLogDir = distPref </> "test"
        testNames = fromFlag $ testList flags
        pkgTests = PD.testSuites pkg_descr
        enabledTests = filter PD.testEnabled pkgTests

        doTest :: (PD.TestSuite, Maybe TestSuiteLog) -> IO TestSuiteLog
        doTest (suite, mLog) = do
            let testLogPath = testSuiteLogPath humanTemplate pkg_descr lbi
                go pre cmd post = testController flags pkg_descr lbi suite
                                                 pre cmd post testLogPath
            case PD.testInterface suite of
              PD.TestSuiteExeV10 _ _ -> do
                    let cmd = LBI.buildDir lbi </> PD.testName suite
                            </> PD.testName suite <.> exeExtension
                        preTest _ = ""
                        postTest exit _ =
                            let r = case exit of
                                    ExitSuccess -> TestSuite.Pass
                                    ExitFailure c -> TestSuite.Fail
                                        $ "exit code: " ++ show c
                            in TestSuiteLog
                                { name = PD.testName suite
                                , cases = [Case (PD.testName suite) mempty r]
                                , logFile = ""
                                }
                    go preTest cmd postTest

              PD.TestSuiteLibV09 _ _ -> do
                    let cmd = LBI.buildDir lbi </> stubName suite
                            </> stubName suite <.> exeExtension
                        oldLog = case mLog of
                            Nothing -> TestSuiteLog
                                { name = PD.testName suite
                                , cases = []
                                , logFile = []
                                }
                            Just l -> l
                        preTest f = show $ oldLog { logFile = f }
                        postTest _ = read
                    go preTest cmd postTest

              _ -> return TestSuiteLog
                            { name = PD.testName suite
                            , cases = [Case (PD.testName suite) mempty
                                $ TestSuite.Error $ "No support for running "
                                ++ "test suite type: "
                                ++ show (disp $ PD.testType suite)]
                            , logFile = ""
                            }

    when (not $ PD.hasTests pkg_descr) $ do
        notice verbosity "Package has no test suites."
        exitWith ExitSuccess

    when (PD.hasTests pkg_descr && null enabledTests) $
        die $ "No test suites enabled. Did you remember to configure with "
              ++ "\'--enable-tests\'?"

    testsToRun <- case testNames of
            [] -> return $ zip enabledTests $ repeat Nothing
            names -> flip mapM names $ \tName ->
                let testMap = zip enabledNames enabledTests
                    enabledNames = map PD.testName enabledTests
                    allNames = map PD.testName pkgTests
                in case lookup tName testMap of
                    Just t -> return (t, Nothing)
                    _ | tName `elem` allNames ->
                          die $ "Package configured with test suite "
                                ++ tName ++ " disabled."
                      | otherwise -> die $ "no such test: " ++ tName

    createDirectoryIfMissing True testLogDir

    -- Delete ordinary files from test log directory.
    getDirectoryContents testLogDir
        >>= filterM doesFileExist . map (testLogDir </>)
        >>= mapM_ removeFile

    let totalSuites = length testsToRun
    notice verbosity $ "Running " ++ show totalSuites ++ " test suites..."
    suites <- mapM doTest testsToRun
    let packageLog = (localPackageLog pkg_descr lbi) { testSuites = suites }
        packageLogFile = (</>) testLogDir
            $ packageLogPath machineTemplate pkg_descr lbi
    allOk <- summarizePackage verbosity packageLog
    writeFile packageLogFile $ show packageLog
    unless allOk exitFailure

-- | Print a summary to the console after all test suites have been run
-- indicating the number of successful test suites and cases.  Returns 'True' if
-- all test suites passed and 'False' otherwise.
summarizePackage :: Verbosity -> PackageLog -> IO Bool
summarizePackage verbosity packageLog = do
    let cases' = map caseResult $ concatMap cases $ testSuites packageLog
        passedCases = length $ filter (== TestSuite.Pass) cases'
        totalCases = length cases'
        passedSuites = length $ filter suitePassed $ testSuites packageLog
        totalSuites = length $ testSuites packageLog
    notice verbosity $ show passedSuites ++ " of " ++ show totalSuites
        ++ " test suites (" ++ show passedCases ++ " of "
        ++ show totalCases ++ " test cases) passed."
    return $! passedSuites == totalSuites

-- | Print a summary of a single test case's result to the console, supressing
-- output for certain verbosity or test filter levels.
summarizeCase :: Verbosity -> TestShowDetails -> Case -> IO ()
summarizeCase verbosity details t =
    when shouldPrint $ notice verbosity $ "Test case " ++ caseName t
        ++ ": " ++ show (caseResult t)
    where shouldPrint = (details > Never) && (notPassed || details == Always)
          notPassed = caseResult t /= TestSuite.Pass

-- | Print a summary of the test suite's results on the console, suppressing
-- output for certain verbosity or test filter levels.
summarizeSuiteFinish :: TestSuiteLog -> String
summarizeSuiteFinish testLog = unlines
    [ "Test suite " ++ name testLog ++ ": " ++ resStr
    , "Test suite logged to: " ++ logFile testLog
    ]
    where resStr = map toUpper (resultString testLog)

summarizeSuiteStart :: String -> String
summarizeSuiteStart n = "Test suite " ++ n ++ ": RUNNING...\n"

resultString :: TestSuiteLog -> String
resultString l | suiteError l = "error"
               | suiteFailed l = "fail"
               | otherwise = "pass"

testSuiteLogPath :: PathTemplate
                 -> PD.PackageDescription
                 -> LBI.LocalBuildInfo
                 -> TestSuiteLog
                 -> FilePath
testSuiteLogPath template pkg_descr lbi testLog =
    fromPathTemplate $ substPathTemplate env template
    where
        env = initialPathTemplateEnv
                (PD.package pkg_descr) (compilerId $ LBI.compiler lbi)
                ++  [ (TestSuiteNameVar, toPathTemplate $ name testLog)
                    , (TestSuiteResultVar, result)
                    ]
        result = toPathTemplate $ resultString testLog

-- TODO: This is abusing the notion of a 'PathTemplate'.  The result
-- isn't neccesarily a path.
testOption :: PD.PackageDescription
           -> LBI.LocalBuildInfo
           -> PD.TestSuite
           -> PathTemplate
           -> String
testOption pkg_descr lbi suite template =
    fromPathTemplate $ substPathTemplate env template
  where
    env = initialPathTemplateEnv
          (PD.package pkg_descr) (compilerId $ LBI.compiler lbi) ++
          [(TestSuiteNameVar, toPathTemplate $ PD.testName suite)]

packageLogPath :: PathTemplate
               -> PD.PackageDescription
               -> LBI.LocalBuildInfo
               -> FilePath
packageLogPath template pkg_descr lbi =
    fromPathTemplate $ substPathTemplate env template
    where
        env = initialPathTemplateEnv
                (PD.package pkg_descr) (compilerId $ LBI.compiler lbi)

-- | The filename of the source file for the stub executable associated with a
-- library 'TestSuite'.
stubFilePath :: PD.TestSuite -> FilePath
stubFilePath t = stubName t <.> "hs"

-- | The name of the stub executable associated with a library 'TestSuite'.
stubName :: PD.TestSuite -> FilePath
stubName t = PD.testName t ++ "Stub"

-- | Write the source file for a library 'TestSuite' stub executable.
writeSimpleTestStub :: PD.TestSuite -- ^ library 'TestSuite' for which a stub
                                    -- is being created
                    -> FilePath     -- ^ path to directory where stub source
                                    -- should be located
                    -> IO ()
writeSimpleTestStub t dir = do
    createDirectoryIfMissing True dir
    let filename = dir </> stubFilePath t
        PD.TestSuiteLibV09 _ m = PD.testInterface t
    writeFile filename $ simpleTestStub m

-- | Source code for library test suite stub executable
simpleTestStub :: ModuleName -> String
simpleTestStub m = unlines
    [ "module Main ( main ) where"
    , "import Control.Monad ( liftM )"
    , "import Distribution.Simple.Test ( runTests )"
    , "import " ++ show (disp m) ++ " ( tests )"
    , "main :: IO ()"
    , "main = runTests tests"
    ]

-- | The test runner used in library "TestSuite" stub executables.  Runs a list
-- of 'Test's.  An executable calling this function is meant to be invoked as
-- the child of a Cabal process during @.\/setup test@.  A 'TestSuiteLog',
-- provided by Cabal, is read from the standard input; it supplies the name of
-- the test suite and the location of the machine-readable test suite log file.
-- Human-readable log information is written to the standard output for capture
-- by the calling Cabal process.
runTests :: [TestSuite.Test] -> IO ()
runTests tests = do
    testLogIn <- liftM read getContents
    let go :: TestSuite.Test -> IO Case
        go t = do
            o <- getTestOptions t testLogIn
            r <- TestSuite.runM t o
            let ret = Case
                    { caseName = TestSuite.name t
                    , caseOptions = o
                    , caseResult = r
                    }
            summarizeCase normal Always ret
            return ret
    cases' <- mapM go tests
    let testLog = testLogIn { cases = cases'}
    writeFile (logFile testLog) $ show testLog
    when (suiteError testLog) $ exitWith $ ExitFailure 2
    when (suiteFailed testLog) $ exitWith $ ExitFailure 1
    exitWith ExitSuccess
