{-# LANGUAGE PackageImports, ScopedTypeVariables, TupleSections #-}
{-# OPTIONS -fno-warn-name-shadowing #-}
module Debian.Repo.Package.SourcePackagesOfIndex
    ( sourcePackagesOfIndex
    ) where

import Control.Exception as E (SomeException)
import "mtl" Control.Monad.Trans (MonadIO(..))
import Data.List as List (map)
import Debian.Arch (Arch(Source))
import Debian.Repo.Package.GetPackages (getPackages)
import Debian.Repo.Package.ToSourcePackage (toSourcePackage)
import Debian.Repo.Types.PackageIndex (BinaryPackage(packageInfo), PackageIndex(packageIndexArch), SourcePackage)
import Debian.Repo.Types.Release (Release)
import Debian.Repo.Types.Repo (RepoKey)
import Debian.Repo.Types.Repository (MonadRepoCache)
-- >>= return . either Left (Right . List.map (toBinaryPackage index . packageInfo))

-- | Get the contents of a package index
sourcePackagesOfIndex :: MonadRepoCache m => RepoKey -> Release -> PackageIndex -> m (Either SomeException [SourcePackage])
sourcePackagesOfIndex repo release index =
    case packageIndexArch index of
      Source -> liftIO (getPackages repo release index) >>= return . either Left (Right . List.map (toSourcePackage index . packageInfo))
      _ -> return (Right [])