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-----------------------------------------------------------------------------
-- |
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-- Module      :  Distribution.Simple.Register
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-- Copyright   :  Isaac Jones 2003-2004
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-- License     :  BSD3
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--
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-- Maintainer  :  cabal-devel@haskell.org
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-- Portability :  portable
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--
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-- This module deals with registering and unregistering packages. There are a
-- couple ways it can do this, one is to do it directly. Another is to generate
-- a script that can be run later to do it. The idea here being that the user
-- is shielded from the details of what command to use for package registration
-- for a particular compiler. In practice this aspect was not especially
-- popular so we also provide a way to simply generate the package registration
-- file which then must be manually passed to @ghc-pkg@. It is possible to
-- generate registration information for where the package is to be installed,
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-- or alternatively to register the package in place in the build tree. The
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-- latter is occasionally handy, and will become more important when we try to
-- build multi-package systems.
--
-- This module does not delegate anything to the per-compiler modules but just
-- mixes it all in in this module, which is rather unsatisfactory. The script
-- generation and the unregister feature are not well used or tested.
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module Distribution.Simple.Register (
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    register,
    unregister,

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    initPackageDB,
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    invokeHcPkg,
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    registerPackage,
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    generateRegistrationInfo,
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    inplaceInstalledPackageInfo,
    absoluteInstalledPackageInfo,
    generalInstalledPackageInfo,
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  ) where
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import Distribution.Simple.LocalBuildInfo
         ( LocalBuildInfo(..), ComponentLocalBuildInfo(..)
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         , ComponentName(..), getComponentLocalBuildInfo
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         , LibraryName(..)
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         , InstallDirs(..), absoluteInstallDirs )
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import Distribution.Simple.BuildPaths (haddockName)
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import qualified Distribution.Simple.GHC  as GHC
import qualified Distribution.Simple.LHC  as LHC
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import qualified Distribution.Simple.UHC  as UHC
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import qualified Distribution.Simple.HaskellSuite as HaskellSuite
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import Distribution.Simple.Compiler
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         ( compilerVersion, Compiler, CompilerFlavor(..), compilerFlavor
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         , PackageDB, PackageDBStack, absolutePackageDBPaths
         , registrationPackageDB )
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import Distribution.Simple.Program
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         ( ProgramConfiguration, ConfiguredProgram
         , runProgramInvocation, requireProgram, lookupProgram
         , ghcPkgProgram, lhcPkgProgram )
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import Distribution.Simple.Program.Script
         ( invocationAsSystemScript )
import qualified Distribution.Simple.Program.HcPkg as HcPkg
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import Distribution.Simple.Setup
         ( RegisterFlags(..), CopyDest(..)
         , fromFlag, fromFlagOrDefault, flagToMaybe )
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import Distribution.PackageDescription
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         ( PackageDescription(..), Library(..), BuildInfo(..), libModules )
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import Distribution.Package
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         ( Package(..), packageName, InstalledPackageId(..) )
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import Distribution.InstalledPackageInfo
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         ( InstalledPackageInfo, InstalledPackageInfo_(InstalledPackageInfo)
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         , showInstalledPackageInfo )
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import qualified Distribution.InstalledPackageInfo as IPI
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import Distribution.Simple.Utils
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         ( writeUTF8File, writeFileAtomic, setFileExecutable
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         , die, notice, setupMessage, shortRelativePath )
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import Distribution.System
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         ( OS(..), buildOS )
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import Distribution.Text
         ( display )
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import Distribution.Version ( Version(..) )
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import Distribution.Verbosity as Verbosity
         ( Verbosity, normal )
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import System.FilePath ((</>), (<.>), isAbsolute)
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import System.Directory
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         ( getCurrentDirectory )
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import Control.Monad (when)
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import Data.Maybe
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         ( isJust, fromMaybe, maybeToList )
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import Data.List
         ( partition, nub )
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import qualified Data.ByteString.Lazy.Char8 as BS.Char8
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-- -----------------------------------------------------------------------------
-- Registration

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register :: PackageDescription -> LocalBuildInfo
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         -> RegisterFlags -- ^Install in the user's database?; verbose
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         -> IO ()
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register pkg@PackageDescription { library       = Just lib  } lbi regFlags
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  = do
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    let clbi = getComponentLocalBuildInfo lbi CLibName
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    absPackageDBs    <- absolutePackageDBPaths packageDbs
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    installedPkgInfo <- generateRegistrationInfo
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                           verbosity pkg lib lbi clbi inplace reloc distPref
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                           (registrationPackageDB absPackageDBs)
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    when (fromFlag (regPrintId regFlags)) $ do
      putStrLn (display (IPI.installedPackageId installedPkgInfo))

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     -- Three different modes:
    case () of
     _ | modeGenerateRegFile   -> writeRegistrationFile installedPkgInfo
       | modeGenerateRegScript -> writeRegisterScript   installedPkgInfo
       | otherwise             -> registerPackage verbosity
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                                    installedPkgInfo pkg lbi inplace packageDbs
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  where
    modeGenerateRegFile = isJust (flagToMaybe (regGenPkgConf regFlags))
    regFile             = fromMaybe (display (packageId pkg) <.> "conf")
                                    (fromFlag (regGenPkgConf regFlags))

    modeGenerateRegScript = fromFlag (regGenScript regFlags)

    inplace   = fromFlag (regInPlace regFlags)
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    reloc     = relocatable lbi
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    -- FIXME: there's really no guarantee this will work.
    -- registering into a totally different db stack can
    -- fail if dependencies cannot be satisfied.
    packageDbs = nub $ withPackageDB lbi
                    ++ maybeToList (flagToMaybe  (regPackageDB regFlags))
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    distPref  = fromFlag (regDistPref regFlags)
    verbosity = fromFlag (regVerbosity regFlags)

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    writeRegistrationFile installedPkgInfo = do
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      notice verbosity ("Creating package registration file: " ++ regFile)
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      writeUTF8File regFile (showInstalledPackageInfo installedPkgInfo)
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    writeRegisterScript installedPkgInfo =
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      case compilerFlavor (compiler lbi) of
        GHC  -> do (ghcPkg, _) <- requireProgram verbosity ghcPkgProgram (withPrograms lbi)
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                   writeHcPkgRegisterScript verbosity installedPkgInfo ghcPkg packageDbs
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        LHC  -> do (lhcPkg, _) <- requireProgram verbosity lhcPkgProgram (withPrograms lbi)
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                   writeHcPkgRegisterScript verbosity installedPkgInfo lhcPkg packageDbs
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        JHC  -> notice verbosity "Registration scripts not needed for jhc"
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        UHC  -> notice verbosity "Registration scripts not needed for uhc"
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        _    -> die "Registration scripts are not implemented for this compiler"

register _ _ regFlags = notice verbosity "No package to register"
  where
    verbosity = fromFlag (regVerbosity regFlags)


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generateRegistrationInfo :: Verbosity
                         -> PackageDescription
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                         -> Library
                         -> LocalBuildInfo
                         -> ComponentLocalBuildInfo
                         -> Bool
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                         -> Bool
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                         -> FilePath
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                         -> PackageDB
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                         -> IO InstalledPackageInfo
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generateRegistrationInfo verbosity pkg lib lbi clbi inplace reloc distPref packageDb = do
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  --TODO: eliminate pwd!
  pwd <- getCurrentDirectory
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  --TODO: the method of setting the InstalledPackageId is compiler specific
  --      this aspect should be delegated to a per-compiler helper.
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  let comp = compiler lbi
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  ipid <-
    case compilerFlavor comp of
     GHC | compilerVersion comp >= Version [6,11] [] -> do
            s <- GHC.libAbiHash verbosity pkg lbi lib clbi
            return (InstalledPackageId (display (packageId pkg) ++ '-':s))
     _other -> do
            return (InstalledPackageId (display (packageId pkg)))
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  -- let installedPkgInfo
  --       | inplace   = inplaceInstalledPackageInfo pwd distPref
  --                       pkg ipid lib lbi clbi
  --       | reloc     = relocatableInstalledPackageInfo
  --                       pkg ipid lib lbi clbi undefined
  --       | otherwise = absoluteInstalledPackageInfo
  --                       pkg ipid lib lbi clbi

  installedPkgInfo <- if inplace then
                         return (inplaceInstalledPackageInfo pwd distPref
                                  pkg ipid lib lbi clbi)
                      else if reloc then
                         relocRegistrationInfo verbosity pkg lib lbi clbi ipid
                           packageDb
                      else
                         return (absoluteInstalledPackageInfo
                                   pkg ipid lib lbi clbi)

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  return installedPkgInfo{ IPI.installedPackageId = ipid }

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relocRegistrationInfo :: Verbosity
                      -> PackageDescription
                      -> Library
                      -> LocalBuildInfo
                      -> ComponentLocalBuildInfo
                      -> InstalledPackageId
                      -> PackageDB
                      -> IO InstalledPackageInfo
relocRegistrationInfo verbosity pkg lib lbi clbi ipid packageDb =
  case (compilerFlavor (compiler lbi)) of
    GHC -> do let Just ghcPkg = lookupProgram ghcPkgProgram (withPrograms lbi)
              fsM <- HcPkg.pkgRoot verbosity ghcPkg packageDb
              case fsM of
                Just fs -> return (relocatableInstalledPackageInfo
                                    pkg ipid lib lbi clbi fs)
                Nothing -> die "Cannot register relocatable package with empty ${pkgroot}"
    _   -> die "Distribution.Simple.Register.relocRegistrationInfo: \
               \not implemented for this compiler"
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-- | Create an empty package DB at the specified location.
initPackageDB :: Verbosity -> Compiler -> ProgramConfiguration -> FilePath
                 -> IO ()
initPackageDB verbosity comp conf dbPath =
  case (compilerFlavor comp) of
    GHC -> GHC.initPackageDB verbosity conf dbPath
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    HaskellSuite {} -> HaskellSuite.initPackageDB verbosity conf dbPath
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    _   -> die "Distribution.Simple.Register.initPackageDB: \
               \not implemented for this compiler"

-- | Run @hc-pkg@ using a given package DB stack, directly forwarding the
-- provided command-line arguments to it.
invokeHcPkg :: Verbosity -> Compiler -> ProgramConfiguration -> PackageDBStack
                -> [String] -> IO ()
invokeHcPkg verbosity comp conf dbStack extraArgs =
    case (compilerFlavor comp) of
      GHC -> GHC.invokeHcPkg verbosity conf dbStack extraArgs
      _   -> die "Distribution.Simple.Register.invokeHcPkg: \
                 \not implemented for this compiler"
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registerPackage :: Verbosity
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                -> InstalledPackageInfo
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                -> PackageDescription
                -> LocalBuildInfo
                -> Bool
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                -> PackageDBStack
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                -> IO ()
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registerPackage verbosity installedPkgInfo pkg lbi inplace packageDbs = do
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  let msg = if inplace
            then "In-place registering"
            else "Registering"
  setupMessage verbosity msg (packageId pkg)
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  case compilerFlavor (compiler lbi) of
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    GHC  -> GHC.registerPackage  verbosity installedPkgInfo pkg lbi inplace packageDbs
    LHC  -> LHC.registerPackage  verbosity installedPkgInfo pkg lbi inplace packageDbs
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    UHC  -> UHC.registerPackage  verbosity installedPkgInfo pkg lbi inplace packageDbs
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    JHC  -> notice verbosity "Registering for jhc (nothing to do)"
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    HaskellSuite {} ->
      HaskellSuite.registerPackage verbosity installedPkgInfo pkg lbi inplace packageDbs
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    _    -> die "Registering is not implemented for this compiler"


writeHcPkgRegisterScript :: Verbosity
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                         -> InstalledPackageInfo
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                         -> ConfiguredProgram
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                         -> PackageDBStack
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                         -> IO ()
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writeHcPkgRegisterScript verbosity installedPkgInfo hcPkg packageDbs = do
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  let invocation  = HcPkg.reregisterInvocation hcPkg Verbosity.normal
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                      packageDbs (Right installedPkgInfo)
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      regScript   = invocationAsSystemScript buildOS   invocation

  notice verbosity ("Creating package registration script: " ++ regScriptFileName)
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  writeUTF8File regScriptFileName regScript
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  setFileExecutable regScriptFileName

regScriptFileName :: FilePath
regScriptFileName = case buildOS of
                        Windows -> "register.bat"
                        _       -> "register.sh"
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-- -----------------------------------------------------------------------------
-- Making the InstalledPackageInfo

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-- | Construct 'InstalledPackageInfo' for a library in a package, given a set
-- of installation directories.
--
generalInstalledPackageInfo
  :: ([FilePath] -> [FilePath]) -- ^ Translate relative include dir paths to
                                -- absolute paths.
  -> PackageDescription
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  -> InstalledPackageId
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  -> Library
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  -> LocalBuildInfo
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  -> ComponentLocalBuildInfo
  -> InstallDirs FilePath
  -> InstalledPackageInfo
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generalInstalledPackageInfo adjustRelIncDirs pkg ipid lib lbi clbi installDirs =
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  InstalledPackageInfo {
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    IPI.installedPackageId = ipid,
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    IPI.sourcePackageId    = packageId   pkg,
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    IPI.packageKey         = pkgKey lbi,
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    IPI.license            = license     pkg,
    IPI.copyright          = copyright   pkg,
    IPI.maintainer         = maintainer  pkg,
    IPI.author             = author      pkg,
    IPI.stability          = stability   pkg,
    IPI.homepage           = homepage    pkg,
    IPI.pkgUrl             = pkgUrl      pkg,
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    IPI.synopsis           = synopsis    pkg,
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    IPI.description        = description pkg,
    IPI.category           = category    pkg,
    IPI.exposed            = libExposed  lib,
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    IPI.exposedModules     = map fixupSelf (componentExposedModules clbi),
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    IPI.hiddenModules      = otherModules bi,
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    IPI.instantiatedWith   = map (\(k,(p,n)) ->
                                   (k,IPI.OriginalModule (IPI.installedPackageId p) n))
                                 (instantiatedWith lbi),
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    IPI.trusted            = IPI.trusted IPI.emptyInstalledPackageInfo,
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    IPI.importDirs         = [ libdir installDirs | hasModules ],
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    -- Note. the libsubdir and datasubdir templates have already been expanded
    -- into libdir and datadir.
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    IPI.libraryDirs        = if hasLibrary
                               then libdir installDirs : extraLibDirs bi
                               else                      extraLibDirs bi,
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    IPI.dataDir            = datadir installDirs,
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    IPI.hsLibraries        = [ libname
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                             | LibraryName libname <- componentLibraries clbi
                             , hasLibrary ],
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    IPI.extraLibraries     = extraLibs bi,
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    IPI.extraGHCiLibraries = extraGHCiLibs bi,
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    IPI.includeDirs        = absinc ++ adjustRelIncDirs relinc,
    IPI.includes           = includes bi,
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    IPI.depends            = map fst (componentPackageDeps clbi),
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    IPI.ccOptions          = [], -- Note. NOT ccOptions bi!
                                 -- We don't want cc-options to be propagated
                                 -- to C compilations in other packages.
    IPI.ldOptions          = ldOptions bi,
    IPI.frameworkDirs      = [],
    IPI.frameworks         = frameworks bi,
    IPI.haddockInterfaces  = [haddockdir installDirs </> haddockName pkg],
    IPI.haddockHTMLs       = [htmldir installDirs]
  }
  where
    bi = libBuildInfo lib
    (absinc, relinc) = partition isAbsolute (includeDirs bi)
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    hasModules = not $ null (libModules lib)
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    hasLibrary = hasModules || not (null (cSources bi))
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    -- Since we currently don't decide the InstalledPackageId of our package
    -- until just before we register, we didn't have one for the re-exports
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    -- of modules defined within this package, so we used an empty one that
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    -- we fill in here now that we know what it is. It's a bit of a hack,
    -- we ought really to decide the InstalledPackageId ahead of time.
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    fixupSelf (IPI.ExposedModule n o o') =
        IPI.ExposedModule n (fmap fixupOriginalModule o)
                            (fmap fixupOriginalModule o')
    fixupOriginalModule (IPI.OriginalModule i m) = IPI.OriginalModule (fixupIpid i) m
    fixupIpid (InstalledPackageId []) = ipid
    fixupIpid x = x
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-- | Construct 'InstalledPackageInfo' for a library that is in place in the
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-- build tree.
--
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-- This function knows about the layout of in place packages.
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--
inplaceInstalledPackageInfo :: FilePath -- ^ top of the build tree
                            -> FilePath -- ^ location of the dist tree
                            -> PackageDescription
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                            -> InstalledPackageId
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                            -> Library
                            -> LocalBuildInfo
                            -> ComponentLocalBuildInfo
                            -> InstalledPackageInfo
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inplaceInstalledPackageInfo inplaceDir distPref pkg ipid lib lbi clbi =
    generalInstalledPackageInfo adjustRelativeIncludeDirs
                                pkg ipid lib lbi clbi installDirs
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  where
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    adjustRelativeIncludeDirs = map (inplaceDir </>)
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    installDirs =
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      (absoluteInstallDirs pkg lbi NoCopyDest) {
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        libdir     = inplaceDir </> buildDir lbi,
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        datadir    = inplaceDir </> dataDir pkg,
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        docdir     = inplaceDocdir,
        htmldir    = inplaceHtmldir,
        haddockdir = inplaceHtmldir
      }
    inplaceDocdir  = inplaceDir </> distPref </> "doc"
    inplaceHtmldir = inplaceDocdir </> "html" </> display (packageName pkg)


-- | Construct 'InstalledPackageInfo' for the final install location of a
-- library package.
--
-- This function knows about the layout of installed packages.
--
absoluteInstalledPackageInfo :: PackageDescription
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                             -> InstalledPackageId
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                             -> Library
                             -> LocalBuildInfo
                             -> ComponentLocalBuildInfo
                             -> InstalledPackageInfo
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absoluteInstalledPackageInfo pkg ipid lib lbi clbi =
    generalInstalledPackageInfo adjustReativeIncludeDirs
                                pkg ipid lib lbi clbi installDirs
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  where
    -- For installed packages we install all include files into one dir,
    -- whereas in the build tree they may live in multiple local dirs.
    adjustReativeIncludeDirs _
      | null (installIncludes bi) = []
      | otherwise                 = [includedir installDirs]
    bi = libBuildInfo lib
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    installDirs = absoluteInstallDirs pkg lbi NoCopyDest
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relocatableInstalledPackageInfo :: PackageDescription
                                -> InstalledPackageId
                                -> Library
                                -> LocalBuildInfo
                                -> ComponentLocalBuildInfo
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                                -> FilePath
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                                -> InstalledPackageInfo
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relocatableInstalledPackageInfo pkg ipid lib lbi clbi pkgroot =
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    generalInstalledPackageInfo adjustReativeIncludeDirs
                                pkg ipid lib lbi clbi installDirs
  where
    -- For installed packages we install all include files into one dir,
    -- whereas in the build tree they may live in multiple local dirs.
    adjustReativeIncludeDirs _
      | null (installIncludes bi) = []
      | otherwise                 = [includedir installDirs]
    bi = libBuildInfo lib
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    installDirs = fmap (("${pkgroot}" </>) . shortRelativePath pkgroot)
                $ absoluteInstallDirs pkg lbi NoCopyDest
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-- -----------------------------------------------------------------------------
-- Unregistration
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unregister :: PackageDescription -> LocalBuildInfo -> RegisterFlags -> IO ()
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unregister pkg lbi regFlags = do
  let pkgid     = packageId pkg
      genScript = fromFlag (regGenScript regFlags)
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      verbosity = fromFlag (regVerbosity regFlags)
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      packageDb = fromFlagOrDefault (registrationPackageDB (withPackageDB lbi))
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                                    (regPackageDB regFlags)
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  setupMessage verbosity "Unregistering" pkgid
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  case compilerFlavor (compiler lbi) of
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    GHC ->
      let Just ghcPkg = lookupProgram ghcPkgProgram (withPrograms lbi)
          invocation = HcPkg.unregisterInvocation ghcPkg Verbosity.normal
                         packageDb pkgid
      in if genScript
           then writeFileAtomic unregScriptFileName
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                  (BS.Char8.pack $ invocationAsSystemScript buildOS invocation)
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            else runProgramInvocation verbosity invocation
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    _ ->
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        die ("unregistering is only implemented for GHC")
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unregScriptFileName :: FilePath
unregScriptFileName = case buildOS of
                          Windows -> "unregister.bat"
                          _       -> "unregister.sh"