module Handler.Exam.New
  ( getCExamNewR, postCExamNewR
  ) where

import Import
import Handler.Exam.Form
import Handler.Exam.CorrectorInvite

import qualified Data.Set as Set

import Handler.Utils
import Handler.Utils.Invitations

import Jobs.Queue


getCExamNewR, postCExamNewR :: TermId -> SchoolId -> CourseShorthand -> Handler Html
getCExamNewR = postCExamNewR
postCExamNewR tid ssh csh = do
  (cid, template) <- runDB $ do
    cid <- getKeyBy404 $ TermSchoolCourseShort tid ssh csh
    template <- examTemplate cid
    return (cid, template)

  ((newExamResult, newExamWidget), newExamEnctype) <- runFormPost . validateForm validateExam $ examForm template

  formResult newExamResult $ \ExamForm{..} -> do
    insertRes <- runDBJobs $ do
      insertRes <- insertUnique Exam
        { examName                         = efName
        , examCourse                       = cid
        , examGradingRule                  = efGradingRule
        , examBonusRule                    = efBonusRule
        , examOccurrenceRule               = efOccurrenceRule
        , examVisibleFrom                  = efVisibleFrom
        , examRegisterFrom                 = efRegisterFrom
        , examRegisterTo                   = efRegisterTo
        , examDeregisterUntil              = efDeregisterUntil
        , examPublishOccurrenceAssignments = efPublishOccurrenceAssignments
        , examStart                        = efStart
        , examEnd                          = efEnd
        , examFinished                     = efFinished
        , examClosed                       = Nothing
        , examShowGrades                   = efShowGrades
        , examPublicStatistics             = efPublicStatistics
        , examDescription                  = efDescription
        }
      whenIsJust insertRes $ \examid -> do
        insertMany_
          [ ExamPart{..}
          | ExamPartForm{..} <- Set.toList efExamParts
          , let examPartExam      = examid
                examPartNumber    = epfNumber
                examPartName      = epfName
                examPartMaxPoints = epfMaxPoints
                examPartWeight    = epfWeight
          ]

        insertMany_
          [ ExamOccurrence{..}
          | ExamOccurrenceForm{..} <- Set.toList efOccurrences
          , let examOccurrenceExam        = examid
                examOccurrenceName        = eofName
                examOccurrenceRoom        = eofRoom
                examOccurrenceCapacity    = eofCapacity
                examOccurrenceStart       = eofStart
                examOccurrenceEnd         = eofEnd
                examOccurrenceDescription = eofDescription
          ]

        let (invites, adds) = partitionEithers $ Set.toList efCorrectors
        insertMany_ [ ExamCorrector{..}
                    | examCorrectorUser <- adds
                    , let examCorrectorExam = examid
                    ]
        sinkInvitationsF examCorrectorInvitationConfig $ map (, examid, (InvDBDataExamCorrector, InvTokenDataExamCorrector)) invites
      return insertRes
    case insertRes of
      Nothing -> addMessageI Error $ MsgExamNameTaken efName
      Just _  -> do
        addMessageI Success $ MsgExamCreated efName
        redirect $ CourseR tid ssh csh CExamListR

  let heading = prependCourseTitle tid ssh csh MsgExamNew

  siteLayoutMsg heading $ do
    setTitleI heading
    let
      newExamForm = wrapForm newExamWidget def
        { formMethod = POST
        , formAction = Just . SomeRoute $ CourseR tid ssh csh CExamNewR
        , formEncoding = newExamEnctype
        }
    $(widgetFile "exam-new")