-----------------------------------------------------------------------------
-- |
-- 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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    * Neither the name of Isaac Jones nor the names of other
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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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 )
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 )
import Data.Char ( toUpper )
import Data.Monoid ( mempty )
import System.Directory
    ( createDirectoryIfMissing, doesFileExist, getCurrentDirectory
    , removeFile )
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
               -> 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 suite preTest cmd postTest logNamer = do
    let distPref = fromFlag $ testDistPref flags
        verbosity = fromFlag $ testVerbosity flags
        testLogDir = distPref </> "test"
        options = fromFlag $ testOptions flags

    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

        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 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 = ""
                            }

    testsToRun <- case testNames of
            [] -> return $ zip pkgTests $ repeat Nothing
            names -> flip mapM names $ \tName ->
                let testMap = map (\x -> (PD.testName x, x)) pkgTests
                in case lookup tName testMap of
                    Just t -> return (t, Nothing)
                    _ -> die $ "no such test: " ++ tName

    createDirectoryIfMissing True testLogDir

    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

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