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{-| Implementation of the job information.

-}

{-

Copyright (C) 2009, 2010, 2011 Google Inc.

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301, USA.

-}

module Ganeti.Jobs

    ( OpStatus(..)

    , JobStatus(..)

    ) where

import Text.JSON (readJSON, showJSON, JSON)

import qualified Text.JSON as J

import qualified Ganeti.Constants as C

-- | Our ADT for the OpCode status at runtime (while in a job).

data OpStatus = OP_STATUS_QUEUED

              | OP_STATUS_WAITLOCK

              | OP_STATUS_CANCELING

              | OP_STATUS_RUNNING

              | OP_STATUS_CANCELED

              | OP_STATUS_SUCCESS

              | OP_STATUS_ERROR

                deriving (Eq, Enum, Bounded, Show, Read)

instance JSON OpStatus where

    showJSON os = showJSON w

      where w = case os of

              OP_STATUS_QUEUED -> C.jobStatusQueued

              OP_STATUS_WAITLOCK -> C.jobStatusWaitlock

              OP_STATUS_CANCELING -> C.jobStatusCanceling

              OP_STATUS_RUNNING -> C.jobStatusRunning

              OP_STATUS_CANCELED -> C.jobStatusCanceled

              OP_STATUS_SUCCESS -> C.jobStatusSuccess

              OP_STATUS_ERROR -> C.jobStatusError

    readJSON s = case readJSON s of

      J.Ok v | v == C.jobStatusQueued -> J.Ok OP_STATUS_QUEUED

             | v == C.jobStatusWaitlock -> J.Ok OP_STATUS_WAITLOCK

             | v == C.jobStatusCanceling -> J.Ok OP_STATUS_CANCELING

             | v == C.jobStatusRunning -> J.Ok OP_STATUS_RUNNING

             | v == C.jobStatusCanceled -> J.Ok OP_STATUS_CANCELED

             | v == C.jobStatusSuccess -> J.Ok OP_STATUS_SUCCESS

             | v == C.jobStatusError -> J.Ok OP_STATUS_ERROR

             | otherwise -> J.Error ("Unknown opcode status " ++ v)

      _ -> J.Error ("Cannot parse opcode status " ++ show s)

-- | The JobStatus data type. Note that this is ordered especially

-- such that greater\/lesser comparison on values of this type makes

-- sense.

data JobStatus = JOB_STATUS_QUEUED

               | JOB_STATUS_WAITLOCK

               | JOB_STATUS_RUNNING

               | JOB_STATUS_SUCCESS

               | JOB_STATUS_CANCELING

               | JOB_STATUS_CANCELED

               | JOB_STATUS_ERROR

                 deriving (Eq, Enum, Ord, Bounded, Show, Read)

instance JSON JobStatus where

    showJSON js = showJSON w

        where w = case js of

                JOB_STATUS_QUEUED -> "queued"

                JOB_STATUS_WAITLOCK -> "waiting"

                JOB_STATUS_CANCELING -> "canceling"

                JOB_STATUS_RUNNING -> "running"

                JOB_STATUS_CANCELED -> "canceled"

                JOB_STATUS_SUCCESS -> "success"

                JOB_STATUS_ERROR -> "error"

    readJSON s = case readJSON s of

      J.Ok "queued" -> J.Ok JOB_STATUS_QUEUED

      J.Ok "waiting" -> J.Ok JOB_STATUS_WAITLOCK

      J.Ok "canceling" -> J.Ok JOB_STATUS_CANCELING

      J.Ok "running" -> J.Ok JOB_STATUS_RUNNING

      J.Ok "success" -> J.Ok JOB_STATUS_SUCCESS

      J.Ok "canceled" -> J.Ok JOB_STATUS_CANCELED

      J.Ok "error" -> J.Ok JOB_STATUS_ERROR

      _ -> J.Error ("Unknown job status " ++ show s)