-----------------------------------------------------------------------------
-- |
-- Module      :  Distribution.Simple.LocalBuildInfo
-- Copyright   :  Isaac Jones 2003-2004
--
-- Maintainer  :  cabal-devel@haskell.org
-- Portability :  portable
--
-- Once a package has been configured we have resolved conditionals and
-- dependencies, configured the compiler and other needed external programs.
-- The 'LocalBuildInfo' is used to hold all this information. It holds the
-- install dirs, the compiler, the exact package dependencies, the configured
-- programs, the package database to use and a bunch of miscellaneous configure
-- flags. It gets saved and reloaded from a file (@dist\/setup-config@). It gets
-- passed in to very many subsequent build actions.

{- All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.

    * Neither the name of Isaac Jones nor the names of other
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -}

module Distribution.Simple.LocalBuildInfo (
        LocalBuildInfo(..),
        externalPackageDeps,
        inplacePackageId,

        -- * Buildable package components
        Component(..),
        foldComponent,
        allComponentsBy,
        ComponentName(..),
        ComponentLocalBuildInfo(..),
        withComponentsLBI,
        withLibLBI,
        withExeLBI,
        withTestLBI,

        -- * Installation directories
        module Distribution.Simple.InstallDirs,
        absoluteInstallDirs, prefixRelativeInstallDirs,
        substPathTemplate
  ) where


import Distribution.Simple.InstallDirs hiding (absoluteInstallDirs,
                                               prefixRelativeInstallDirs,
                                               substPathTemplate, )
import qualified Distribution.Simple.InstallDirs as InstallDirs
import Distribution.Simple.Program (ProgramConfiguration)
import Distribution.PackageDescription
         ( PackageDescription(..), withLib, Library(libBuildInfo), withExe
         , Executable(exeName, buildInfo), withTest, TestSuite(..)
         , BuildInfo(buildable), Benchmark(..) )
import Distribution.Package
         ( PackageId, Package(..), InstalledPackageId(..) )
import Distribution.Simple.Compiler
         ( Compiler(..), PackageDBStack, OptimisationLevel )
import Distribution.Simple.PackageIndex
         ( PackageIndex )
import Distribution.Simple.Utils
         ( die )
import Distribution.Simple.Setup
         ( ConfigFlags )
import Distribution.Text
         ( display )

import Data.List (nub, find)

-- | Data cached after configuration step.  See also
-- 'Distribution.Simple.Setup.ConfigFlags'.
data LocalBuildInfo = LocalBuildInfo {
        configFlags   :: ConfigFlags,
        -- ^ Options passed to the configuration step.
        -- Needed to re-run configuration when .cabal is out of date
        extraConfigArgs     :: [String],
        -- ^ Extra args on the command line for the configuration step.
        -- Needed to re-run configuration when .cabal is out of date
        installDirTemplates :: InstallDirTemplates,
                -- ^ The installation directories for the various differnt
                -- kinds of files
        --TODO: inplaceDirTemplates :: InstallDirs FilePath
        compiler      :: Compiler,
                -- ^ The compiler we're building with
        buildDir      :: FilePath,
                -- ^ Where to build the package.
        --TODO: eliminate hugs's scratchDir, use builddir
        scratchDir    :: FilePath,
                -- ^ Where to put the result of the Hugs build.
        libraryConfig       :: Maybe ComponentLocalBuildInfo,
        executableConfigs   :: [(String, ComponentLocalBuildInfo)],
        compBuildOrder :: [ComponentName],
                -- ^ All the components to build, ordered by topological sort
                -- over the intrapackage dependency graph
        testSuiteConfigs    :: [(String, ComponentLocalBuildInfo)],
        benchmarkConfigs    :: [(String, ComponentLocalBuildInfo)],
        installedPkgs :: PackageIndex,
                -- ^ All the info about the installed packages that the
                -- current package depends on (directly or indirectly).
        pkgDescrFile  :: Maybe FilePath,
                -- ^ the filename containing the .cabal file, if available
        localPkgDescr :: PackageDescription,
                -- ^ The resolved package description, that does not contain
                -- any conditionals.
        withPrograms  :: ProgramConfiguration, -- ^Location and args for all programs
        withPackageDB :: PackageDBStack,  -- ^What package database to use, global\/user
        withVanillaLib:: Bool,  -- ^Whether to build normal libs.
        withProfLib   :: Bool,  -- ^Whether to build profiling versions of libs.
        withSharedLib :: Bool,  -- ^Whether to build shared versions of libs.
        withDynExe    :: Bool,  -- ^Whether to link executables dynamically
        withProfExe   :: Bool,  -- ^Whether to build executables for profiling.
        withOptimization :: OptimisationLevel, -- ^Whether to build with optimization (if available).
        withGHCiLib   :: Bool,  -- ^Whether to build libs suitable for use with GHCi.
        splitObjs     :: Bool,  -- ^Use -split-objs with GHC, if available
        stripExes     :: Bool,  -- ^Whether to strip executables during install
        progPrefix    :: PathTemplate, -- ^Prefix to be prepended to installed executables
        progSuffix    :: PathTemplate -- ^Suffix to be appended to installed executables
  } deriving (Read, Show)

-- | External package dependencies for the package as a whole. This is the
-- union of the individual 'componentPackageDeps', less any internal deps.
externalPackageDeps :: LocalBuildInfo -> [(InstalledPackageId, PackageId)]
externalPackageDeps lbi = filter (not . internal . snd) $ nub $
  -- TODO:  what about non-buildable components?
       maybe [] componentPackageDeps (libraryConfig lbi)
    ++ concatMap (componentPackageDeps . snd) (executableConfigs lbi)
  where
    -- True if this dependency is an internal one (depends on the library
    -- defined in the same package).
    internal pkgid = pkgid == packageId (localPkgDescr lbi)

-- | The installed package Id we use for local packages registered in the local
-- package db. This is what is used for intra-package deps between components.
--
inplacePackageId :: PackageId -> InstalledPackageId
inplacePackageId pkgid = InstalledPackageId (display pkgid ++ "-inplace")

-- -----------------------------------------------------------------------------
-- Buildable components

data Component = CLib   Library
               | CExe   Executable
               | CTest  TestSuite
               | CBench Benchmark
               deriving (Show, Eq, Read)

data ComponentName = CLibName   -- currently only a single lib
                   | CExeName   String
                   | CTestName  String
                   | CBenchName String
                   deriving (Show, Eq, Read)

data ComponentLocalBuildInfo = ComponentLocalBuildInfo {
    -- | Resolved internal and external package dependencies for this component.
    -- The 'BuildInfo' specifies a set of build dependencies that must be
    -- satisfied in terms of version ranges. This field fixes those dependencies
    -- to the specific versions available on this machine for this compiler.
    componentPackageDeps :: [(InstalledPackageId, PackageId)]
  }
  deriving (Read, Show)

foldComponent :: (Library -> a)
              -> (Executable -> a)
              -> (TestSuite -> a)
              -> (Benchmark -> a)
              -> Component
              -> a
foldComponent f _ _ _ (CLib   lib) = f lib
foldComponent _ f _ _ (CExe   exe) = f exe
foldComponent _ _ f _ (CTest  tst) = f tst
foldComponent _ _ _ f (CBench bch) = f bch

-- | Obtains all components (libs, exes, or test suites), transformed by the
-- given function.  Useful for gathering dependencies with component context.
allComponentsBy :: PackageDescription
                -> (Component -> a)
                -> [a]
allComponentsBy pkg_descr f =
    [ f (CLib  lib) | Just lib <- [library pkg_descr]
                    , buildable (libBuildInfo lib) ]
 ++ [ f (CExe  exe) | exe <- executables pkg_descr
                    , buildable (buildInfo exe) ]
 ++ [ f (CTest tst) | tst <- testSuites pkg_descr
                    , buildable (testBuildInfo tst)
                    , testEnabled tst ]
 ++ [ f (CBench bm) | bm <- benchmarks pkg_descr
                    , buildable (benchmarkBuildInfo bm)
                    , benchmarkEnabled bm ]

-- |If the package description has a library section, call the given
--  function with the library build info as argument.  Extended version of
-- 'withLib' that also gives corresponding build info.
withLibLBI :: PackageDescription -> LocalBuildInfo
           -> (Library -> ComponentLocalBuildInfo -> IO ()) -> IO ()
withLibLBI pkg_descr lbi f = withLib pkg_descr $ \lib ->
  case libraryConfig lbi of
    Just clbi -> f lib clbi
    Nothing   -> die missingLibConf

-- | Perform the action on each buildable 'Executable' in the package
-- description.  Extended version of 'withExe' that also gives corresponding
-- build info.
withExeLBI :: PackageDescription -> LocalBuildInfo
           -> (Executable -> ComponentLocalBuildInfo -> IO ()) -> IO ()
withExeLBI pkg_descr lbi f = withExe pkg_descr $ \exe ->
  case lookup (exeName exe) (executableConfigs lbi) of
    Just clbi -> f exe clbi
    Nothing   -> die (missingExeConf (exeName exe))

withTestLBI :: PackageDescription -> LocalBuildInfo
            -> (TestSuite -> ComponentLocalBuildInfo -> IO ()) -> IO ()
withTestLBI pkg_descr lbi f = withTest pkg_descr $ \test ->
  case lookup (testName test) (testSuiteConfigs lbi) of
    Just clbi -> f test clbi
    Nothing -> die (missingTestConf (testName test))

-- | Perform the action on each buildable 'Library' or 'Executable' (Component)
-- in the PackageDescription, subject to the build order specified by the
-- 'compBuildOrder' field of the given 'LocalBuildInfo'
withComponentsLBI :: PackageDescription -> LocalBuildInfo
                  -> (Component -> ComponentLocalBuildInfo -> IO ())
                  -> IO ()
withComponentsLBI pkg_descr lbi f = mapM_ compF (compBuildOrder lbi)
  where
    compF CLibName =
        case library pkg_descr of
          Nothing  -> die missinglib
          Just lib -> case libraryConfig lbi of
                        Nothing   -> die missingLibConf
                        Just clbi -> f (CLib lib) clbi
      where
        missinglib  = "internal error: component list includes a library "
                   ++ "but the package description contains no library"

    compF (CExeName name) =
        case find (\exe -> exeName exe == name) (executables pkg_descr) of
          Nothing  -> die missingexe
          Just exe -> case lookup name (executableConfigs lbi) of
                        Nothing   -> die (missingExeConf name)
                        Just clbi -> f (CExe exe) clbi
      where
        missingexe  = "internal error: component list includes an executable "
                   ++ name ++ " but the package contains no such executable."

    compF (CTestName name) =
        case find (\tst -> testName tst == name) (testSuites pkg_descr) of
          Nothing  -> die missingtest
          Just tst -> case lookup name (testSuiteConfigs lbi) of
                        Nothing   -> die (missingTestConf name)
                        Just clbi -> f (CTest tst) clbi
      where
        missingtest = "internal error: component list includes a test suite "
                   ++ name ++ " but the package contains no such test suite."

    compF (CBenchName name) =
        case find (\bch -> benchmarkName bch == name) (benchmarks pkg_descr) of
          Nothing  -> die missingbench
          Just bch -> case lookup name (benchmarkConfigs lbi) of
                        Nothing   -> die (missingBenchConf name)
                        Just clbi -> f (CBench bch) clbi
      where
        missingbench = "internal error: component list includes a benchmark "
                       ++ name ++ " but the package contains no such benchmark."

missingLibConf :: String
missingExeConf, missingTestConf, missingBenchConf :: String -> String

missingLibConf       = "internal error: the package contains a library "
                    ++ "but there is no corresponding configuration data"
missingExeConf  name = "internal error: the package contains an executable "
                    ++ name ++ " but there is no corresponding configuration data"
missingTestConf name = "internal error: the package contains a test suite "
                    ++ name ++ " but there is no corresponding configuration data"
missingBenchConf name = "internal error: the package contains a benchmark "
                    ++ name ++ " but there is no corresponding configuration data"


-- -----------------------------------------------------------------------------
-- Wrappers for a couple functions from InstallDirs

-- |See 'InstallDirs.absoluteInstallDirs'
absoluteInstallDirs :: PackageDescription -> LocalBuildInfo -> CopyDest
                    -> InstallDirs FilePath
absoluteInstallDirs pkg lbi copydest =
  InstallDirs.absoluteInstallDirs
    (packageId pkg)
    (compilerId (compiler lbi))
    copydest
    (installDirTemplates lbi)

-- |See 'InstallDirs.prefixRelativeInstallDirs'
prefixRelativeInstallDirs :: PackageId -> LocalBuildInfo
                          -> InstallDirs (Maybe FilePath)
prefixRelativeInstallDirs pkg_descr lbi =
  InstallDirs.prefixRelativeInstallDirs
    (packageId pkg_descr)
    (compilerId (compiler lbi))
    (installDirTemplates lbi)

substPathTemplate :: PackageId -> LocalBuildInfo
                  -> PathTemplate -> FilePath
substPathTemplate pkgid lbi = fromPathTemplate
                                . ( InstallDirs.substPathTemplate env )
    where env = initialPathTemplateEnv
                   pkgid
                   (compilerId (compiler lbi))
