-----------------------------------------------------------------------------
-- |
-- Module      :  Hackage.Types
-- Copyright   :  (c) David Himmelstrup 2005
-- License     :  BSD-like
--
-- Maintainer  :  lemmih@gmail.com
-- Stability   :  provisional
-- Portability :  portable
--
-- All data types for the entire cabal-install system gathered here to avoid some .hs-boot files.
-----------------------------------------------------------------------------
module Hackage.Types where

import Distribution.Package
         ( PackageIdentifier(..), Package(..), PackageFixedDeps(..)
         , Dependency )
import Distribution.PackageDescription
         ( GenericPackageDescription, FlagAssignment )

import Network.URI (URI)
import Control.Exception
         ( Exception )

newtype Username = Username { unUsername :: String }
newtype Password = Password { unPassword :: String }

-- | A 'ConfiguredPackage' is a not-yet-installed package along with the
-- total configuration information. The configuration information is total in
-- the sense that it provides all the configuration information and so the
-- final configure process will be independent of the environment.
--
data ConfiguredPackage = ConfiguredPackage
       AvailablePackage    -- package info, including repo
       FlagAssignment      -- complete flag assignment for the package
       [PackageIdentifier] -- set of exact dependencies. These must be
                           -- consistent with the 'buildDepends' in the
                           -- 'PackageDescrption' that you'd get by applying
                           -- the flag assignment.
  deriving Show

instance Package ConfiguredPackage where
  packageId (ConfiguredPackage pkg _ _) = packageId pkg

instance PackageFixedDeps ConfiguredPackage where
  depends (ConfiguredPackage _ _ deps) = deps


-- | We re-use @GenericPackageDescription@ and use the @package-url@
-- field to store the tarball URI.
data AvailablePackage = AvailablePackage {
    packageInfoId      :: PackageIdentifier,
    packageDescription :: GenericPackageDescription,
    packageSource      :: AvailablePackageSource
  }
  deriving Show

instance Package AvailablePackage where packageId = packageInfoId

data AvailablePackageSource =

    -- | The unpacked package in the current dir
    LocalUnpackedPackage
    
    -- | A package available as a tarball from a remote repository, with a
    -- locally cached copy. ie a package available from hackage
  | RepoTarballPackage Repo

--  | ScmPackage
  deriving Show

--TODO:
--  * generalise local package to any local unpacked package, not just in the
--      current dir, ie add a FilePath param
--  * add support for darcs and other SCM style remote repos with a local cache

data RemoteRepo = RemoteRepo {
    remoteRepoName :: String,
    remoteRepoURI  :: URI
  }
  deriving (Show,Eq)

data Repo = Repo {
    repoRemote   :: RemoteRepo,
    repoCacheDir :: FilePath
  }
  deriving (Show,Eq)

repoName :: Repo -> String
repoName = remoteRepoName . repoRemote

repoURI :: Repo -> URI
repoURI = remoteRepoURI . repoRemote

data UnresolvedDependency
    = UnresolvedDependency
    { dependency :: Dependency
    , depFlags   :: FlagAssignment
    }
  deriving (Show)

data BuildResult = DependentFailed PackageIdentifier
                 | UnpackFailed    Exception
                 | ConfigureFailed Exception
                 | BuildFailed     Exception
                 | InstallFailed   Exception
                 | BuildOk