module Handler.ShowChallenge where

import Import
import Yesod.Form.Bootstrap3 (BootstrapFormLayout (..), renderBootstrap3, bfs)

import qualified Data.Text.Lazy as TL
import           Text.Markdown

import qualified Data.Text as T
import qualified Data.Map.Strict as M

import qualified Yesod.Table as Table

import Handler.Extract
import Handler.Shared
import Handler.Runner
import Handler.Tables
import Handler.TagUtils
import Handler.MakePublic
import Handler.Dashboard
import Handler.Common

import Text.Blaze

import Gonito.ExtractMetadata (ExtractionOptions(..),
                               extractMetadataFromRepoDir,
                               GonitoMetadata(..),
                               parseTags,
                               Link(..))

import qualified Text.Read as TR

import GEval.Core
import GEval.EvaluationScheme
import GEval.Common (MetricValue)
import GEval.OptionsParser
import GEval.ParseParams (parseParamsFromFilePath, OutputFileParsed(..))

import PersistSHA1

import Options.Applicative

import System.IO (readFile)

import System.FilePath (takeFileName, dropExtensions, (-<.>))

import Data.Text (pack, unpack)

import Data.Conduit.SmartSource

import Data.List (nub)

import qualified Database.Esqueleto      as E
import           Database.Esqueleto      ((^.))

getShowChallengeR :: Text -> Handler Html
getShowChallengeR name = do
  app <- getYesod
  let leaderboardStyle = appLeaderboardStyle $ appSettings app

  challengeEnt@(Entity challengeId challenge) <- runDB $ getBy404 $ UniqueName name
  Just repo <- runDB $ get $ challengePublicRepo challenge
  (leaderboard, (entries, tests)) <- getLeaderboardEntries leaderboardStyle challengeId
  mauth <- maybeAuth

  let params = getNumericalParams entries

  let scheme = appRepoScheme $ appSettings app

  challengeRepo <- runDB $ get404 $ challengePublicRepo challenge

  challengeLayout True challenge (showChallengeWidget mauth
                                                      challengeEnt
                                                      scheme
                                                      challengeRepo
                                                      repo
                                                      leaderboard
                                                      params
                                                      tests)

getChallengeReadmeR :: Text -> Handler Html
getChallengeReadmeR name = do
  (Entity _ challenge) <- runDB $ getBy404 $ UniqueName name
  readme <- challengeReadme name
  challengeLayout False challenge $ toWidget readme

challengeReadme :: Text -> HandlerFor App Html
challengeReadme name = do
  (Entity _ challenge) <- runDB $ getBy404 $ UniqueName name
  let repoId = challengePublicRepo challenge
  repoDir <- getRepoDir repoId
  let readmeFilePath = repoDir </> readmeFile
  theContents <- liftIO $ System.IO.readFile readmeFilePath
  return $ markdown def $ TL.pack theContents

showChallengeWidget :: Maybe (Entity User)
                      -> Entity Challenge
                      -> RepoScheme
                      -> Repo
                      -> Repo
                      -> [LeaderboardEntry]
                      -> [Text]
                      -> [Entity Test]
                      -> WidgetFor App ()
showChallengeWidget mUserEnt
                    (Entity challengeId challenge)
                    scheme
                    challengeRepo
                    repo
                    leaderboard
                    params
                    tests
  = $(widgetFile "show-challenge")
  where leaderboardWithRanks = zip [1..] leaderboard
        maybeRepoLink = getRepoLink repo
        delta = Number 4
        higherTheBetterArray = getIsHigherTheBetterArray $ map entityVal tests
        mUserId = entityKey <$> mUserEnt

getRepoLink :: Repo -> Maybe Text
getRepoLink repo
  | sitePrefix `isPrefixOf` url = Just $ (browsableGitRepo bareRepoName) ++ "/" ++ (repoBranch repo)
  | otherwise = Nothing
  where sitePrefix = "git://gonito.net/" :: Text
        sitePrefixLen = length sitePrefix
        url = repoUrl repo
        bareRepoName = drop sitePrefixLen url

getChallengeHowToR :: Text -> Handler Html
getChallengeHowToR name = do
  (Entity _ challenge) <- runDB $ getBy404 $ UniqueName name
  maybeUser <- maybeAuth

  app <- getYesod
  let settings = appSettings app

  let publicRepoId = challengePublicRepo challenge
  repo <- runDB $ get404 publicRepoId

  case maybeUser of
    Just (Entity userId user) -> do
      enableTriggerToken userId (userTriggerToken user)
    Nothing -> return ()

  let mToken = case maybeUser of
        Just (Entity _ user) -> userTriggerToken user
        Nothing -> Nothing

  let isIDSet = case maybeUser of
                  Just (Entity _ user) -> isJust $ userLocalId user
                  Nothing -> False
  isSSHUploaded <- case maybeUser of
    Just (Entity userId _) -> do
      ukeys <- runDB $ selectList [PublicKeyUser ==. userId] []
      return $ not (null ukeys)
    Nothing -> return False
  challengeLayout False challenge (challengeHowTo
                                   challenge
                                   settings
                                   repo
                                   (idToBeShown challenge maybeUser)
                                   isIDSet
                                   isSSHUploaded
                                   mToken)

idToBeShown :: p -> Maybe (Entity User) -> Text
idToBeShown _ maybeUser =
  case maybeUser of
   Just user ->  case userLocalId $ entityVal user of
                 Just localId -> localId
                 Nothing -> defaultIdToBe
   Nothing -> defaultIdToBe
  where defaultIdToBe = "YOURID" :: Text

defaultRepo :: RepoScheme -> Text -> Challenge -> Repo -> Maybe (Entity User) -> Text
defaultRepo SelfHosted repoHost challenge _ maybeUser = repoHost ++ (idToBeShown challenge maybeUser) ++ "/" ++ (challengeName challenge)
defaultRepo Branches _ _ repo _ = repoUrl repo

defaultBranch :: IsString a => RepoScheme -> Maybe a
defaultBranch SelfHosted = Just "master"
defaultBranch Branches = Nothing

challengeHowTo :: (Text.Blaze.ToMarkup a1, Text.Blaze.ToMarkup a2) => Challenge -> AppSettings -> Repo -> a1 -> Bool -> Bool -> Maybe a2 -> WidgetFor App ()
challengeHowTo challenge settings repo shownId isIDSet isSSHUploaded mToken = $(widgetFile "challenge-how-to")
  where myBranch = case appRepoScheme settings of
          SelfHosted -> "master" :: Text
          _ -> "my-brilliant-branch"

postArchiveR :: ChallengeId -> Handler Html
postArchiveR challengeId = doSetArchive True challengeId

postUnarchiveR :: ChallengeId -> Handler Html
postUnarchiveR challengeId = doSetArchive False challengeId

doSetArchive :: Bool -> ChallengeId -> Handler Html
doSetArchive status challengeId = do
  runDB $ update challengeId [ChallengeArchived =. Just status]
  challenge <- runDB $ get404 challengeId
  getShowChallengeR $ challengeName challenge


archiveForm :: ChallengeId -> Form ChallengeId
archiveForm challengeId = renderBootstrap3 BootstrapBasicForm $ areq hiddenField "" (Just challengeId)

getChallengeSubmissionR :: Text -> Handler Html
getChallengeSubmissionR name = do
   (Entity _ challenge) <- runDB $ getBy404 $ UniqueName name
   maybeUser <- maybeAuth

   Just repo <- runDB $ get $ challengePublicRepo challenge
   app <- getYesod
   let scheme = appRepoScheme $ appSettings app
   let repoHost = appRepoHost $ appSettings app

   (formWidget, formEnctype) <- generateFormPost $ submissionForm (Just $ defaultRepo scheme repoHost challenge repo maybeUser) (defaultBranch scheme) (repoGitAnnexRemote repo)
   challengeLayout True challenge $ challengeSubmissionWidget formWidget formEnctype challenge

postChallengeSubmissionR :: Text -> Handler TypedContent
postChallengeSubmissionR name = do
    (Entity challengeId _) <- runDB $ getBy404 $ UniqueName name
    ((result, _), _) <- runFormPost $ submissionForm Nothing Nothing Nothing
    let submissionData = case result of
          FormSuccess res -> Just res
          _ -> Nothing
        Just (mDescription, mTags, submissionUrl, submissionBranch, submissionGitAnnexRemote) = submissionData

    userId <- requireAuthId
    runViewProgress $ doCreateSubmission userId challengeId mDescription mTags RepoSpec {
                                                                                  repoSpecUrl=submissionUrl,
                                                                                  repoSpecBranch=submissionBranch,
                                                                                  repoSpecGitAnnexRemote=submissionGitAnnexRemote}

postTriggerLocallyR :: Handler TypedContent
postTriggerLocallyR = do
  (Just challengeName) <- lookupPostParam "challenge"
  (Just localId) <- lookupPostParam "user"
  mBranch <- lookupPostParam "branch"
  mGitAnnexRemote <- lookupPostParam "git-annex-remote"
  [Entity userId _] <- runDB $ selectList [UserLocalId ==. Just localId] []

  app <- getYesod
  let repoHost = appRepoHost $ appSettings app

  let localRepo = repoHost ++ localId ++ "/" ++ challengeName
  trigger userId challengeName localRepo mBranch mGitAnnexRemote

postTriggerRemotelyR :: Handler TypedContent
postTriggerRemotelyR = do
  (Just challengeName) <- lookupPostParam "challenge"
  (Just url) <- lookupPostParam "url"
  (Just token) <- lookupPostParam "token"
  mBranch <- lookupPostParam "branch"
  mGitAnnexRemote <- lookupPostParam "git-annex-remote"
  [Entity userId _] <- runDB $ selectList [UserTriggerToken ==. Just token] []
  trigger userId challengeName url mBranch mGitAnnexRemote

trigger :: UserId -> Text -> Text -> Maybe Text -> Maybe Text -> Handler TypedContent
trigger userId challengeName url mBranch mGitAnnexRemote = do
  let branch = fromMaybe "master" mBranch
  mChallengeEnt <- runDB $ getBy $ UniqueName challengeName
  case mChallengeEnt of
    Just (Entity challengeId _) -> runOpenViewProgress $ doCreateSubmission userId challengeId
                                                                           Nothing Nothing
                                                                           RepoSpec {repoSpecUrl=url,
                                                                           repoSpecBranch=branch,
                                                                           repoSpecGitAnnexRemote=mGitAnnexRemote}
    Nothing -> return $ toTypedContent (("Unknown challenge `" ++ (Data.Text.unpack challengeName) ++ "`. Cannot be triggered, must be submitted manually at Gonito.net!\n") :: String)

isBefore :: UTCTime -> Maybe UTCTime -> Bool
isBefore _ Nothing = True
isBefore moment (Just deadline) = moment <= deadline

doCreateSubmission :: UserId -> Key Challenge -> Maybe Text -> Maybe Text -> RepoSpec -> Channel -> Handler ()
doCreateSubmission userId challengeId mDescription mTags repoSpec chan = do
  challenge <- runDB $ get404 challengeId

  version <- runDB $ getBy404 $ UniqueVersionByCommit $ challengeVersion challenge
  theNow <- liftIO getCurrentTime

  if theNow `isBefore` (versionDeadline $ entityVal version)
    then
      doCreateSubmission' (challengeArchived challenge) userId challengeId mDescription mTags repoSpec chan
    else
      msg chan "Submission is past the deadline, no submission will be accepted from now on."

doCreateSubmission' :: Maybe Bool -> UserId -> Key Challenge -> Maybe Text -> Maybe Text -> RepoSpec -> Channel -> Handler ()
doCreateSubmission' (Just True) _ _ _ _ _ chan = msg chan "This challenge is archived, you cannot submit to it. Ask the site admin to unarchive it."
doCreateSubmission' _ userId challengeId mDescription mTags repoSpec chan = do
   maybeRepoKey <- getSubmissionRepo userId challengeId repoSpec chan
   case maybeRepoKey of
    Just repoId -> do

      challenge <- runDB $ get404 challengeId
      user <- runDB $ get404 userId

      relevantIndicators <- getOngoingTargets challengeId

      (Entity mainTestId mainTest) <- runDB $ fetchMainTest challengeId

      (Entity _ currentVersion) <- runDB $ getBy404 $ UniqueVersionByCommit $ challengeVersion challenge
      let submittedMajorVersion = versionMajor currentVersion

      let orderDirection = case getMetricOrdering (evaluationSchemeMetric $ testMetric mainTest) of
            TheHigherTheBetter -> E.desc
            TheLowerTheBetter -> E.asc

      bestResultSoFar <- runDB $ E.select $ E.from $ \(evaluation, submission, variant, out, test, version) -> do
              E.where_ (submission ^. SubmissionChallenge E.==. E.val challengeId
                        E.&&. submission ^. SubmissionIsHidden E.==. E.val False
                        E.&&. variant ^. VariantSubmission E.==. submission ^. SubmissionId
                        E.&&. evaluation ^. EvaluationChecksum E.==. out ^. OutChecksum
                        E.&&. (E.not_ (E.isNothing (evaluation ^. EvaluationScore)))
                        E.&&. out ^. OutVariant E.==. variant ^. VariantId
                        E.&&. evaluation ^. EvaluationTest E.==. test ^. TestId
                        E.&&. test ^. TestChallenge E.==. E.val challengeId
                        E.&&. test ^. TestName E.==. E.val (testName mainTest)
                        E.&&. test ^. TestMetric E.==. E.val (testMetric mainTest)
                        E.&&. test ^. TestActive
                        E.&&. version ^. VersionCommit E.==. test ^. TestCommit
                        E.&&. version ^. VersionMajor E.>=. E.val submittedMajorVersion)
              E.orderBy [orderDirection (evaluation ^. EvaluationScore)]
              E.limit 1
              return evaluation
      let bestScoreSoFar = join (evaluationScore <$> entityVal <$> (listToMaybe bestResultSoFar))

      case bestScoreSoFar of
        Just s -> msg chan ("best score so far is: " ++ (Data.Text.pack $ show s))
        Nothing -> msg chan "first submission so far"

      repo <- runDB $ get404 repoId

      repoDir <- getRepoDir repoId

      gonitoMetadata <- liftIO
                       $ extractMetadataFromRepoDir repoDir (ExtractionOptions {
                                                                extractionOptionsDescription = mDescription,
                                                                extractionOptionsTags = Just $ parseTags mTags,
                                                                extractionOptionsGeneralParams = Nothing,
                                                                extractionOptionsUnwantedParams = Nothing,
                                                                extractionOptionsParamFiles = Nothing,
                                                                extractionOptionsMLRunPath = Nothing,
                                                                extractionOptionsExternalLinks = Nothing,
                                                                extractionOptionsDependencies = Nothing })

      submissionId <- getSubmission userId
                                   repoId
                                   (repoCurrentCommit repo)
                                   challengeId
                                   (gonitoMetadataDescription gonitoMetadata)
                                   chan

      _ <- runDB $ mapM insert $ map (\l -> ExternalLink {
                                        externalLinkSubmission = submissionId,
                                        externalLinkTitle = linkTitle l,
                                        externalLinkUrl = linkUrl l }) $ gonitoMetadataExternalLinks gonitoMetadata

      _ <- runDB $ mapM insertUnique $ map (\s -> Dependency {
                                                  dependencySubRepoCommit = s,
                                                  dependencySuperRepoCommit = (repoCurrentCommit repo) }) $ gonitoMetadataDependencies gonitoMetadata

      outs <- getOuts chan submissionId (gonitoMetadataGeneralParams gonitoMetadata)

      currentTagIds <- runDB $ selectList [SubmissionTagSubmission ==. submissionId] []

      runDB $ addTags submissionId (gonitoMetadataTags gonitoMetadata)  (
        map (submissionTagTag . entityVal) currentTagIds)
      msg chan "SUBMISSION CREATED"

      app <- getYesod

      newScores <- mapM (getScoreForOut mainTestId) outs
      let newScores' = catMaybes newScores
      let newScores'' = case getMetricOrdering (evaluationSchemeMetric $ testMetric mainTest) of
            TheHigherTheBetter -> reverse $ sort newScores'
            TheLowerTheBetter -> sort newScores'
      let compOp = case getMetricOrdering (evaluationSchemeMetric $ testMetric mainTest) of
            TheLowerTheBetter -> (<)
            TheHigherTheBetter -> (>)

      let submissionLink = slackLink app "submission" ("q/" ++ (fromSHA1ToText (repoCurrentCommit repo)))

      case bestScoreSoFar of
        Just b ->  case newScores'' of
                    (s:_) -> if compOp s b
                             then
                              do
                                let challengeLink = slackLink app (challengeTitle challenge) ("challenge/"
                                                                                              ++ (challengeName challenge))
                                let message = ("Whoa! New best result for "
                                               ++ challengeLink
                                               ++ " challenge by "
                                               ++ (fromMaybe "???" $ userName user)
                                               ++ ", "
                                               ++ (T.pack $ show $ testMetric mainTest)
                                               ++ ": "
                                               ++ (formatScore (testPrecision mainTest) s)
                                               ++ " ("
                                               ++ (if s > b
                                                   then "+"
                                                   else "")
                                               ++ (formatScore (testPrecision mainTest) (s-b))
                                               ++ ")."
                                               ++ " See " ++ submissionLink ++ "."
                                               ++ " :clap:")
                                msg chan message
                                case appNewBestResultSlackHook $ appSettings app of
                                  Just "" -> return ()
                                  Just hook -> liftIO $ runSlackHook hook message

                                  Nothing -> return ()
                             else return ()
                    [] -> return ()
        Nothing -> return ()

      if appAutoOpening $ appSettings app
        then
          doMakePublic userId submissionId chan
        else
          return ()

      if not (null relevantIndicators)
        then
          checkIndicators user challengeId submissionId submissionLink relevantIndicators chan
        else
          return ()

    Nothing -> return ()

checkIndicators :: User -> ChallengeId -> SubmissionId -> Text -> [IndicatorEntry] -> Channel -> Handler ()
checkIndicators user challengeId submissionId submissionLink relevantIndicators chan = do
  msg chan "Checking indicators..."
  theNow <- liftIO $ getCurrentTime
  mapM_ (\indicator -> checkIndicator theNow user challengeId submissionId submissionLink indicator chan) relevantIndicators

checkIndicator :: UTCTime -> User -> ChallengeId -> SubmissionId -> Text -> IndicatorEntry -> Channel -> Handler ()
checkIndicator theNow user challengeId submissionId submissionLink indicator chan = do
  (entries, _) <- runDB $ getChallengeSubmissionInfos (\(Entity sid _) -> sid == submissionId) (const True) challengeId
  mapM_ (\t -> checkTarget theNow user submissionLink entries indicator t chan) (indicatorEntryTargets indicator)

checkTarget :: UTCTime -> User -> Text -> [TableEntry] -> IndicatorEntry -> Entity Target -> Channel -> Handler ()
checkTarget theNow user submissionLink entries indicator target chan = do
  app <- getYesod
  let status = getTargetStatus theNow entries indicator target
  if status == TargetPassed
    then
     do
      let message = "Congratulations!!! The target " ++ indicatorText
                     ++ " was beaten by "
                     ++ (fromMaybe "???" $ userName user)
                     ++ ", "
                     ++ " See " ++ submissionLink ++ "."
                     ++ (T.replicate 10 " :champagne: ") ++ " :mleczko: "
      msg chan message
      case appNewBestResultSlackHook $ appSettings app of
          Just "" -> return ()
          Just hook -> liftIO $ runSlackHook hook message
          Nothing -> return ()
    else
       return ()
  where indicatorText = prettyIndicatorEntry indicator

getScoreForOut :: (PersistQueryRead (YesodPersistBackend site), YesodPersist site, BaseBackend (YesodPersistBackend site) ~ SqlBackend) => Key Test -> Out -> HandlerFor site (Maybe Double)
getScoreForOut mainTestId out = do
  mEvaluation <- runDB $ selectFirst [EvaluationChecksum ==. (outChecksum out),
                                     EvaluationTest ==. mainTestId]
                                    []
  return $ case mEvaluation of
             Just evaluation -> evaluationScore $ entityVal evaluation
             Nothing -> Nothing

getSubmission :: UserId -> Key Repo -> SHA1 -> Key Challenge -> Text -> Channel -> Handler (Key Submission)
getSubmission userId repoId commit challengeId description chan = do
  challenge <- runDB $ get404 challengeId
  maybeSubmission <- runDB $ getBy $ UniqueSubmissionRepoCommitChallenge repoId commit challengeId
  case maybeSubmission of
    Just (Entity submissionId _) -> do
      msg chan "Submission already there, re-checking"
      return submissionId
    Nothing -> do
      msg chan "Creating new submission"
      time <- liftIO getCurrentTime
      runDB $ insert $ Submission {
        submissionRepo=repoId,
        submissionCommit=commit,
        submissionChallenge=challengeId,
        submissionDescription=description,
        submissionStamp=time,
        submissionSubmitter=userId,
        submissionIsPublic=False,
        submissionIsHidden=False,
        submissionVersion=challengeVersion challenge}

-- | Does the evaluation for a submission. Inserts Out, Variant and Evaluation records.
getOuts :: Channel -> Key Submission -> M.Map Text Text -> Handler ([Out])
getOuts chan submissionId generalParams = do
  submission <- runDB $ get404 submissionId
  let challengeId = submissionChallenge submission
  repoDir <- getRepoDir $ submissionRepo submission
  activeTests <- runDB $ selectList [TestChallenge ==. challengeId,
                                    TestActive ==. True,
                                    TestCommit ==. submissionVersion submission] []

  outs' <- mapM (outsForTest repoDir submissionId generalParams) activeTests
  let outs = concat outs'

  mapM_ checkOrInsertOut outs
  mapM_ (checkOrInsertEvaluation repoDir chan) outs
  return outs

outFileName :: FilePath
outFileName = "out.tsv"

getOutFilePath :: FilePath -> Test -> FilePath
getOutFilePath repoDir test = repoDir </> (T.unpack $ testName test) </> outFileName

findOutFile :: FilePath -> Test -> IO (Maybe FilePath)
findOutFile repoDir test = do
  let baseOut = getOutFilePath repoDir test
  ofs <- mapM (\ext -> findFilePossiblyCompressed (baseOut -<.> ext)) extensionsHandled
  return $ listToMaybe $ catMaybes ofs

doesOutExist :: FilePath -> Entity Test -> IO Bool
doesOutExist repoDir (Entity _ test) = do
  result <- findOutFile repoDir test
  return $ isJust result

-- | Returns an Out object (won't insert into a database!)
outForTest :: MonadIO m => FilePath -> FilePath -> Key Variant -> Entity Test -> m Out
outForTest repoDir outF variantId (Entity testId test) = do
  let outPath = repoDir </> (T.unpack $ testName test) </> outF
  checksum <- liftIO $ gatherSHA1ForCollectionOfFiles [outPath]
  return Out {
    outVariant=variantId,
    outTest=testId,
    outChecksum=SHA1 checksum }

-- | Returns all possible outs for a given test.
-- Won't insert Out objects to the database, though it might add new variant objects.
outsForTest :: FilePath -> SubmissionId -> M.Map Text Text -> Entity Test -> HandlerFor App [Out]
outsForTest repoDir submissionId generalParams testEnt@(Entity _ test) = do
  outFiles <- liftIO $ outFilesForTest repoDir test

  forM outFiles $ \outFile -> do
    theVariant <- getVariant submissionId generalParams outFile
    outForTest repoDir outFile theVariant testEnt

-- | Returns the filenames (not file paths) of all output files for a given test.
outFilesForTest :: FilePath -> Test -> IO [FilePath]
outFilesForTest repoDir test = do
    mMultipleOuts <- checkMultipleOutsCore repoDir (Data.Text.unpack $ testName test) "out.tsv"
    case mMultipleOuts of
      Just outFiles -> return $ map takeFileName outFiles
      Nothing -> do
        mOutFile <- findOutFile repoDir test
        case mOutFile of
          Just outF -> return [takeFileName outF]
          Nothing -> return []

getVariant :: SubmissionId -> M.Map Text Text -> FilePath -> Handler VariantId
getVariant submissionId generalParams outFilePath = runDB $ do
  let outFile = takeFileName outFilePath
  let name = Data.Text.pack $ dropExtensions outFile
  maybeVariant <- getBy $ UniqueVariantSubmissionName submissionId name
  case maybeVariant of
    Just (Entity vid _) -> return vid
    Nothing -> do
      vid <- insert $ Variant submissionId name
      let (OutputFileParsed _ paramMap) = parseParamsFromFilePath outFile

      forM_ (M.toList (paramMap `M.union` generalParams)) $ \(param, val) -> do
        _ <- insert $ Parameter vid param val
        return ()

      return vid

checkOrInsertOut :: Out -> Handler ()
checkOrInsertOut out = do
  maybeOut <- runDB $ getBy $ UniqueOutVariantTestChecksum (outVariant out) (outTest out) (outChecksum out)
  case maybeOut of
    Just _ -> return ()
    Nothing -> (runDB $ insert out) >> return ()

checkOrInsertEvaluation :: FilePath -> Channel -> Out -> Handler ()
checkOrInsertEvaluation repoDir chan out = do
  test <- runDB $ get404 $ outTest out
  challenge <- runDB $ get404 $ testChallenge test
  maybeEvaluation <- runDB $ getBy $ UniqueEvaluationTestChecksum (outTest out) (outChecksum out)
  case maybeEvaluation of
    Just (Entity _ evaluation) -> do
      msg chan $ concat ["Already evaluated with score ", (fromMaybe "???" $ formatNonScientifically <$> evaluationScore evaluation)]
    Nothing -> do
      msg chan $ "Start evaluation..."
      challengeDir <- getRepoDir $ challengePrivateRepo challenge
      variant <- runDB $ get404 $ outVariant out
      resultOrException <- liftIO $ rawEval challengeDir (evaluationSchemeMetric $ testMetric test) repoDir (testName test) ((T.unpack $ variantName variant) <.> "tsv")
      case resultOrException of
        Right (Left _) -> do
          err chan "Cannot parse options, check the challenge repo"
        Right (Right (_, Just [(_, [result])])) -> do
          msg chan $ concat [ "Evaluated! Score ", (formatNonScientifically result) ]
          time <- liftIO getCurrentTime
          _ <- runDB $ insert $ Evaluation {
            evaluationTest=outTest out,
            evaluationChecksum=outChecksum out,
            evaluationScore=Just result,
            evaluationErrorMessage=Nothing,
            evaluationStamp=time }
          msg chan "Evaluation done"
        Right (Right (_, Just _)) -> do
          err chan "Unexpected multiple results (???)"
        Right (Right (_, Nothing)) -> do
          err chan "Error during the evaluation"
        Left exception -> do
          err chan $ "Evaluation failed: " ++ (T.pack $ show exception)

rawEval :: FilePath -> Metric -> FilePath -> Text -> FilePath -> IO (Either GEvalException (Either (ParserResult GEvalOptions) (GEvalOptions, Maybe [(SourceSpec, [MetricValue])])))
rawEval challengeDir metric repoDir name outF = Import.try (runGEvalGetOptions [
                                                          "--alt-metric", (show metric),
                                                          "--expected-directory", challengeDir,
                                                          "--out-directory", repoDir,
                                                          "--out-file", outF,
                                                          "--test-name", (T.unpack name)])

getSubmissionRepo :: UserId -> Key Challenge -> RepoSpec -> Channel -> Handler (Maybe (Key Repo))
getSubmissionRepo userId challengeId repoSpec chan = getPossiblyExistingRepo checkRepoAvailibility userId challengeId repoSpec chan

checkRepoAvailibility :: Key Challenge -> Key Repo -> Channel -> Handler Bool
checkRepoAvailibility challengeId repoId chan = do
  maybeOtherChallengeId <- runDB $ selectFirst ( [ChallengePublicRepo ==. repoId]
                                                 ||. [ChallengePrivateRepo ==. repoId]) []
  case maybeOtherChallengeId of
    Just _ -> do
      err chan "Repository already used as a challenge repo, please use a different repo or a different branch"
      return False
    Nothing -> do
      maybeOtherSubmissionId <- runDB $ selectFirst [SubmissionRepo ==. repoId,
                                                    SubmissionChallenge !=. challengeId] []
      case maybeOtherSubmissionId of
        Just _ -> do
          err chan "Repository already used as a submission repo for a different challenge, please use a different repo or a different branch"
          return False
        Nothing -> return True

challengeSubmissionWidget :: (ToMarkup a1, ToWidget App a2) => a2 -> a1 -> Challenge -> WidgetFor App ()
challengeSubmissionWidget formWidget formEnctype challenge = $(widgetFile "challenge-submission")

submissionForm :: Maybe Text -> Maybe Text -> Maybe Text -> Form (Maybe Text, Maybe Text, Text, Text, Maybe Text)
submissionForm defaultUrl defBranch defaultGitAnnexRemote = renderBootstrap3 BootstrapBasicForm $ (,,,,)
    <$> aopt textField (fieldWithTooltip MsgSubmissionDescription MsgSubmissionDescriptionTooltip) Nothing
    <*> aopt textField (tagsfs MsgSubmissionTags) Nothing
    <*> areq textField (bfs MsgSubmissionUrl) defaultUrl
    <*> areq textField (bfs MsgSubmissionBranch) defBranch
    <*> aopt textField (bfs MsgSubmissionGitAnnexRemote) (Just defaultGitAnnexRemote)

getChallengeMySubmissionsR :: Text -> Handler Html
getChallengeMySubmissionsR name = do
  userId <- requireAuthId
  getChallengeSubmissions (\(Entity _ submission) -> (submissionSubmitter submission == userId)) name

getChallengeAllSubmissionsR :: Text -> Handler Html
getChallengeAllSubmissionsR name = getChallengeSubmissions (\_ -> True) name

getChallengeSubmissions :: ((Entity Submission) -> Bool) -> Text -> Handler Html
getChallengeSubmissions condition name = do
  Entity challengeId challenge <- runDB $ getBy404 $ UniqueName name
  (evaluationMaps, tests') <- runDB $ getChallengeSubmissionInfos condition (const True) challengeId
  let tests = sortBy testComparator tests'
  mauth <- maybeAuth
  let muserId = (\(Entity uid _) -> uid) <$> mauth

  app <- getYesod
  let scheme = appRepoScheme $ appSettings app

  challengeRepo <- runDB $ get404 $ challengePublicRepo challenge

  let params = getNumericalParams evaluationMaps

  challengeLayout True challenge (challengeAllSubmissionsWidget muserId
                                                                challenge
                                                                scheme
                                                                challengeRepo
                                                                evaluationMaps
                                                                tests
                                                                params)

getNumericalParams :: [TableEntry] -> [Text]
getNumericalParams entries = filter (isNumericalParam entries) $ getAllParams entries

isNumericalParam :: [TableEntry] -> Text -> Bool
isNumericalParam entries param =
  all doesTextRepresentNumber
  $ concat
  $ map ((map parameterValue)
       . (filter (\p -> parameterName p == param))
       . (map entityVal)
       . tableEntryParams) entries

doesTextRepresentNumber :: Text -> Bool
doesTextRepresentNumber t = isJust $ ((TR.readMaybe $ T.unpack t) :: Maybe Double)

getAllParams :: [TableEntry] -> [Text]
getAllParams entries = sort
               $ nub
               $ concat
               $ map (\entry -> map (parameterName . entityVal) (tableEntryParams entry)) entries


challengeAllSubmissionsWidget :: Maybe UserId
                                -> Challenge
                                -> RepoScheme
                                -> Repo
                                -> [TableEntry]
                                -> [Entity Test]
                                -> [Text]
                                -> WidgetFor App ()
challengeAllSubmissionsWidget muserId challenge scheme challengeRepo submissions tests params =
  $(widgetFile "challenge-all-submissions")
  where delta = Number 4
        higherTheBetterArray = getIsHigherTheBetterArray $ map entityVal tests

paramGraphsWidget :: Challenge -> [Entity Test] -> [Text] -> WidgetFor App ()
paramGraphsWidget challenge tests params = $(widgetFile "param-graphs")
  where chartJSs = getChartJss challenge selectedTests params
        selectedTests = reverse $ getMainTests tests

getChartJss :: Challenge -> [Entity Test] -> [Text] -> JavascriptUrl (Route App)
getChartJss challenge tests params =
  mconcat $ [(getChartJs challenge test param) | test <- tests, param <- params]

getChartJs :: Challenge
             -> Entity Test
             -> Text
             -> JavascriptUrl (Route App)
getChartJs challenge (Entity testId test) param = [julius|
$.getJSON("@{ChallengeParamGraphDataR (challengeName challenge) testId param}", function(data) {
        c3.generate({
                bindto: '#chart-' + #{toJSON param} + '-' + #{toJSON testId},
                data: data,
                axis: {
                   x: {
                     label: #{toJSON param},
                   },
                   y: {
                     label: #{toJSON testFormatted},
                   }
                }
    }) });
|]
   where testFormatted = formatTest test


challengeLayout :: Bool -> Challenge -> WidgetFor App () -> HandlerFor App Html
challengeLayout withHeader challenge widget = do
  tagsAvailableAsJSON <- runDB $ getAvailableTagsAsJSON
  version <- runDB $ getBy404 $ UniqueVersionByCommit $ challengeVersion challenge
  let versionFormatted = formatVersion ((versionMajor $ entityVal version),
                                        (versionMinor $ entityVal version),
                                        (versionPatch $ entityVal version))
  maybeUser <- maybeAuth
  bc <- widgetToPageContent widget
  defaultLayout $ do
    setTitle "Challenge"
    $(widgetFile "challenge")