{-| IAllocator plugin for Ganeti.

-}

{-

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 Main (main) where

import Control.Monad
import Data.Maybe (isJust, fromJust)
import System.IO
import qualified System

import qualified Ganeti.HTools.Cluster as Cluster

import Ganeti.HTools.CLI
import Ganeti.HTools.IAlloc
import Ganeti.HTools.Loader (Request(..), ClusterData(..))

-- | Options list and functions
options :: [OptType]
options =
    [ oPrintNodes
    , oDataFile
    , oNodeSim
    , oVerbose
    , oShowVer
    , oShowHelp
    ]

-- | Main function.
main :: IO ()
main = do
  cmd_args <- System.getArgs
  (opts, args) <- parseOpts cmd_args "hail" options

  let shownodes = optShowNodes opts
      verbose = optVerbose opts

  request <- readRequest opts args

  let Request rq cdata = request

  when (verbose > 1) $
       hPutStrLn stderr $ "Received request: " ++ show rq

  when (verbose > 2) $
       hPutStrLn stderr $ "Received cluster data: " ++ show cdata

  when (isJust shownodes) $ do
         hPutStrLn stderr "Initial cluster status:"
         hPutStrLn stderr $ Cluster.printNodes (cdNodes cdata)
                       (fromJust shownodes)

  let resp = runIAllocator request
  putStrLn resp