module Handler.CreateChallenge where

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

import Handler.Shared
import Handler.Extract

import GEval.Core
import GEval.OptionsParser

import System.Directory (doesFileExist)
import System.FilePath.Find as SFF
import System.FilePath
import qualified Data.Text as T

import PersistSHA1

import qualified Data.ByteString as S
import qualified Data.ByteString.Lazy as L

import Data.Conduit.Binary (sinkLbs, sourceFile)

getCreateChallengeR :: Handler Html
getCreateChallengeR = do
    (formWidget, formEnctype) <- generateFormPost sampleForm
    let submission = Nothing :: Maybe (Import.FileInfo, Text)
        handlerName = "getCreateChallengeR" :: Text
    defaultLayout $ do
        aDomId <- newIdent
        setTitle "Welcome To Yesod!"
        $(widgetFile "create-challenge")

postCreateChallengeR :: Handler TypedContent
postCreateChallengeR = do
    ((result, formWidget), formEnctype) <- runFormPost sampleForm
    let handlerName = "postCreateChallengeR" :: Text
        challengeData = case result of
            FormSuccess res -> Just res
            _ -> Nothing
        Just (name, publicUrl, publicBranch, privateUrl, privateBranch) = challengeData

    userId <- requireAuthId
    user <- runDB $ get404 userId
    if userIsAdmin user
      then
        runViewProgress $ doCreateChallenge name publicUrl publicBranch privateUrl privateBranch
      else
        runViewProgress $ (flip err) "MUST BE AN ADMIN TO CREATE A CHALLENGE"

doCreateChallenge :: Text -> Text -> Text -> Text -> Text -> Channel -> Handler ()
doCreateChallenge name publicUrl publicBranch privateUrl privateBranch chan = do
  maybePublicRepoId <- cloneRepo (RepoSpec {
                                    repoSpecUrl = publicUrl,
                                    repoSpecBranch = publicBranch,
                                    repoSpecReferenceUrl = publicUrl,
                                    repoSpecReferenceBranch = publicBranch}) chan
  case maybePublicRepoId of
    Just publicRepoId -> do
      publicRepo <- runDB $ get404 publicRepoId
      publicRepoDir <- getRepoDir publicRepoId
      maybePrivateRepoId <- cloneRepo (RepoSpec {
                                         repoSpecUrl = privateUrl,
                                         repoSpecBranch = privateBranch,
                                         repoSpecReferenceUrl =(T.pack $ publicRepoDir),
                                         repoSpecReferenceBranch = (repoBranch publicRepo)}) chan
      case maybePrivateRepoId of
          Just privateRepoId -> addChallenge name publicRepoId privateRepoId chan
          Nothing -> return ()
    Nothing -> return ()

addChallenge :: Text -> (Key Repo) -> (Key Repo) -> Channel -> Handler ()
addChallenge name publicRepoId privateRepoId chan = do
  msg chan "adding challenge..."
  publicRepoDir <- getRepoDir publicRepoId
  let readmeFilePath = publicRepoDir </> readmeFile
  doesReadmeExist <- liftIO $ doesFileExist readmeFilePath
  (title, description) <- if doesReadmeExist
                           then
                            liftIO $ extractTitleAndDescription readmeFilePath
                           else do
                            err chan "README was not found"
                            return (defaultTitle, defaultDescription)

  let imageFilePath = publicRepoDir </> imageFile
  doesImageFileExists <- liftIO $ doesFileExist imageFilePath
  mImage <- if doesImageFileExists
             then do
               fileBytes <- liftIO $ runResourceT $ sourceFile imageFilePath $$ sinkLbs
               return $ Just (S.pack . L.unpack $ fileBytes)
             else do
               return Nothing

  time <- liftIO getCurrentTime
  challengeId <- runDB $ insert $ Challenge {
    challengePublicRepo=publicRepoId,
    challengePrivateRepo=privateRepoId,
    challengeName=name,
    challengeTitle=(T.pack $ title),
    challengeDescription=(T.pack $ description),
    challengeStamp=time,
    challengeImage=mImage,
    challengeStarred=False}
  updateTests challengeId chan
  return ()

updateTests :: (Key Challenge) -> Channel -> Handler ()
updateTests challengeId chan = do
  challenge <- runDB $ get404 challengeId
  let repoId = challengePrivateRepo challenge
  repoDir <- getRepoDir repoId
  repo <- runDB $ get404 repoId
  let commit = repoCurrentCommit repo
  testDirs <- liftIO $ findTestDirs repoDir
  mapM_ (checkTestDir chan challengeId challenge commit) testDirs
  msg chan (T.pack $ show testDirs)
  return ()

expectedFileName = "expected.tsv"

doesExpectedExist :: FilePath -> IO Bool
doesExpectedExist fp = doesFileExist (fp </> expectedFileName)

checkTestDir :: Channel -> (Key Challenge) -> Challenge -> SHA1 -> FilePath -> Handler ()
checkTestDir chan challengeId challenge commit testDir = do
  expectedExists <- liftIO $ doesExpectedExist testDir
  if expectedExists
    then do
      msg chan $ concat ["Test dir ", (T.pack testDir), " found."]
      checksum <- liftIO $ gatherSHA1 testDir
      challengeRepoDir <- getRepoDir $ challengePrivateRepo challenge
      optionsParsingResult <- liftIO $ getOptions [
        "--expected-directory", challengeRepoDir,
        "--test-name", takeFileName testDir]
      case optionsParsingResult of
       Left evalException -> do
         err chan "Cannot read metric"
         return ()
       Right opts -> do
         _ <- runDB $ insert $ Test {
           testChallenge=challengeId,
           testMetric=gesMetric $ geoSpec opts,
           testName=T.pack $ takeFileName testDir,
           testChecksum=(SHA1 checksum),
           testCommit=commit,
           testActive=True,
           testPrecision=gesPrecision $ geoSpec opts}
         return ()
    else
      msg chan $ concat ["Test dir ", (T.pack testDir), " does not have expected results."]
  return ()


gatherSHA1 :: FilePath -> IO ByteString
gatherSHA1 testDir = do
  files <- SFF.find always isTestDirHashedFile testDir
  gatherSHA1ForCollectionOfFiles files

isTestDirHashedFile :: FindClause Bool
isTestDirHashedFile = fileType ==? RegularFile


findTestDirs :: FilePath -> IO [FilePath]
findTestDirs = SFF.find never testDirFilter

never :: FindClause Bool
never = depth ==? 0

testDirFilter :: FindClause Bool
testDirFilter = (fileType ==? Directory) &&? (SFF.fileName ~~? "dev-*" ||? SFF.fileName ~~? "test-*")

sampleForm :: Form (Text, Text, Text, Text, Text)
sampleForm = renderBootstrap3 BootstrapBasicForm $ (,,,,)
    <$> areq textField (fieldSettingsLabel MsgName) Nothing
    <*> areq textField (fieldSettingsLabel MsgPublicUrl) Nothing
    <*> areq textField (fieldSettingsLabel MsgBranch) Nothing
    <*> areq textField (fieldSettingsLabel MsgPrivateUrl) Nothing
    <*> areq textField (fieldSettingsLabel MsgBranch) Nothing