{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric #-}

module Distribution.Types.BuildInfo (
    BuildInfo(..),

    emptyBuildInfo,
    allLanguages,
    allExtensions,
    usedExtensions,

    hcOptions,
    hcProfOptions,
    hcSharedOptions,
) where

import Prelude ()
import Distribution.Compat.Prelude

import Distribution.Types.Mixin
import Distribution.Types.Dependency
import Distribution.Types.ExeDependency
import Distribution.Types.LegacyExeDependency
import Distribution.Types.PkgconfigDependency

import Distribution.ModuleName
import Distribution.Compiler
import Language.Haskell.Extension

-- Consider refactoring into executable and library versions.
data BuildInfo = BuildInfo {
        buildable         :: Bool,      -- ^ component is buildable here
        -- | Tools needed to build this bit.
        --
        -- This is a legacy field that "build-tool-depends" larely supersedes.
        --
        -- Unless use are very sure what you are doing, use the functions in
        -- `Distribution.Simple.BuildToolDepends` rather than accessing this
        -- field directly.
        buildTools        :: [LegacyExeDependency],
        -- | Haskell tools needed to build this bit
        --
        -- This field is better than "build-tools" because it allows one to
        -- precisely specify an executable in a package.
        --
        -- Unless use are very sure what you are doing, use the functions in
        -- `Distribution.Simple.BuildToolDepends` rather than accessing this
        -- field directly.
        buildToolDepends  :: [ExeDependency],
        cppOptions        :: [String],  -- ^ options for pre-processing Haskell code
        ccOptions         :: [String],  -- ^ options for C compiler
        ldOptions         :: [String],  -- ^ options for linker
        pkgconfigDepends  :: [PkgconfigDependency], -- ^ pkg-config packages that are used
        frameworks        :: [String], -- ^support frameworks for Mac OS X
        extraFrameworkDirs:: [String], -- ^ extra locations to find frameworks.
        cSources          :: [FilePath],
        jsSources         :: [FilePath],
        hsSourceDirs      :: [FilePath], -- ^ where to look for the Haskell module hierarchy
        otherModules      :: [ModuleName], -- ^ non-exposed or non-main modules
        autogenModules    :: [ModuleName], -- ^ not present on sdist, Paths_* or user-generated with a custom Setup.hs

        defaultLanguage   :: Maybe Language,-- ^ language used when not explicitly specified
        otherLanguages    :: [Language],    -- ^ other languages used within the package
        defaultExtensions :: [Extension],   -- ^ language extensions used by all modules
        otherExtensions   :: [Extension],   -- ^ other language extensions used within the package
        oldExtensions     :: [Extension],   -- ^ the old extensions field, treated same as 'defaultExtensions'

        extraLibs         :: [String], -- ^ what libraries to link with when compiling a program that uses your package
        extraGHCiLibs     :: [String], -- ^ if present, overrides extraLibs when package is loaded with GHCi.
        extraLibDirs      :: [String],
        includeDirs       :: [FilePath], -- ^directories to find .h files
        includes          :: [FilePath], -- ^ The .h files to be found in includeDirs
        installIncludes   :: [FilePath], -- ^ .h files to install with the package
        options           :: [(CompilerFlavor,[String])],
        profOptions       :: [(CompilerFlavor,[String])],
        sharedOptions     :: [(CompilerFlavor,[String])],
        customFieldsBI    :: [(String,String)], -- ^Custom fields starting
                                                -- with x-, stored in a
                                                -- simple assoc-list.
        targetBuildDepends :: [Dependency], -- ^ Dependencies specific to a library or executable target
        mixins :: [Mixin]
    }
    deriving (Generic, Show, Read, Eq, Typeable, Data)

instance Binary BuildInfo

instance Monoid BuildInfo where
  mempty = BuildInfo {
    buildable           = True,
    buildTools          = [],
    buildToolDepends    = [],
    cppOptions          = [],
    ccOptions           = [],
    ldOptions           = [],
    pkgconfigDepends    = [],
    frameworks          = [],
    extraFrameworkDirs  = [],
    cSources            = [],
    jsSources           = [],
    hsSourceDirs        = [],
    otherModules        = [],
    autogenModules      = [],
    defaultLanguage     = Nothing,
    otherLanguages      = [],
    defaultExtensions   = [],
    otherExtensions     = [],
    oldExtensions       = [],
    extraLibs           = [],
    extraGHCiLibs       = [],
    extraLibDirs        = [],
    includeDirs         = [],
    includes            = [],
    installIncludes     = [],
    options             = [],
    profOptions         = [],
    sharedOptions       = [],
    customFieldsBI      = [],
    targetBuildDepends  = [],
    mixins    = []
  }
  mappend = (<>)

instance Semigroup BuildInfo where
  a <> b = BuildInfo {
    buildable           = buildable a && buildable b,
    buildTools          = combine    buildTools,
    buildToolDepends    = combine    buildToolDepends,
    cppOptions          = combine    cppOptions,
    ccOptions           = combine    ccOptions,
    ldOptions           = combine    ldOptions,
    pkgconfigDepends    = combine    pkgconfigDepends,
    frameworks          = combineNub frameworks,
    extraFrameworkDirs  = combineNub extraFrameworkDirs,
    cSources            = combineNub cSources,
    jsSources           = combineNub jsSources,
    hsSourceDirs        = combineNub hsSourceDirs,
    otherModules        = combineNub otherModules,
    autogenModules      = combineNub autogenModules,
    defaultLanguage     = combineMby defaultLanguage,
    otherLanguages      = combineNub otherLanguages,
    defaultExtensions   = combineNub defaultExtensions,
    otherExtensions     = combineNub otherExtensions,
    oldExtensions       = combineNub oldExtensions,
    extraLibs           = combine    extraLibs,
    extraGHCiLibs       = combine    extraGHCiLibs,
    extraLibDirs        = combineNub extraLibDirs,
    includeDirs         = combineNub includeDirs,
    includes            = combineNub includes,
    installIncludes     = combineNub installIncludes,
    options             = combine    options,
    profOptions         = combine    profOptions,
    sharedOptions       = combine    sharedOptions,
    customFieldsBI      = combine    customFieldsBI,
    targetBuildDepends  = combineNub targetBuildDepends,
    mixins    = combine mixins
  }
    where
      combine    field = field a `mappend` field b
      combineNub field = nub (combine field)
      combineMby field = field b `mplus` field a

emptyBuildInfo :: BuildInfo
emptyBuildInfo = mempty

-- | The 'Language's used by this component
--
allLanguages :: BuildInfo -> [Language]
allLanguages bi = maybeToList (defaultLanguage bi)
               ++ otherLanguages bi

-- | The 'Extension's that are used somewhere by this component
--
allExtensions :: BuildInfo -> [Extension]
allExtensions bi = usedExtensions bi
                ++ otherExtensions bi

-- | The 'Extensions' that are used by all modules in this component
--
usedExtensions :: BuildInfo -> [Extension]
usedExtensions bi = oldExtensions bi
                 ++ defaultExtensions bi

-- |Select options for a particular Haskell compiler.
hcOptions :: CompilerFlavor -> BuildInfo -> [String]
hcOptions = lookupHcOptions options

hcProfOptions :: CompilerFlavor -> BuildInfo -> [String]
hcProfOptions = lookupHcOptions profOptions

hcSharedOptions :: CompilerFlavor -> BuildInfo -> [String]
hcSharedOptions = lookupHcOptions sharedOptions

lookupHcOptions :: (BuildInfo -> [(CompilerFlavor,[String])])
                -> CompilerFlavor -> BuildInfo -> [String]
lookupHcOptions f hc bi = [ opt | (hc',opts) <- f bi
                          , hc' == hc
                          , opt <- opts ]