{-# LANGUAGE BangPatterns #-}

module App.Commands.Build
  ( cmdBuild
  ) where

import App.Commands.Options.Type
import Control.Lens
import Control.Monad
import Data.List
import Data.Monoid                         ((<>))
import HaskellWorks.Data.FromForeignRegion
import Options.Applicative
import System.Directory

import qualified App.Commands.Options.Lens             as L
import qualified HaskellWorks.Data.RankSelect.CsPoppy  as CS
import qualified HaskellWorks.Data.RankSelect.Poppy512 as P512

runBuild :: BuildOptions -> IO ()
runBuild opts = case opts ^. L.indexType of
  CsPoppy  -> do
    entries <- listDirectory "data"
    let files = ("data/" ++) <$> (".ib" `isSuffixOf`) `filter` entries
    forM_ files $ \file -> do
      putStrLn $ "Loading cspoppy for " <> file
      CS.CsPoppy !_ !_ !_ <- mmapFromForeignRegion file
      return ()
  Poppy512 -> do
    entries <- listDirectory "data"
    let files = ("data/" ++) <$> (".ib" `isSuffixOf`) `filter` entries
    forM_ files $ \file -> do
      putStrLn $ "Loading cspoppy for " <> file
      P512.Poppy512 !_ !_ <- mmapFromForeignRegion file
      return ()

optsBuild :: Parser BuildOptions
optsBuild = BuildOptions
  <$> option auto
      (   long "index-type"
      <>  help "Index type"
      <>  metavar "INDEX_TYPE"
      )

cmdBuild :: Mod CommandFields (IO ())
cmdBuild = command "build"  $ flip info idm $ runBuild <$> optsBuild