-----------------------------------------------------------------------------
--
-- Module      :  IDE.PackageFlags
-- Copyright   :  (c) Juergen Nicklisch-Franken (aka Jutaro)
-- License     :  GNU-GPL
--
-- Maintainer  :  Juergen Nicklisch-Franken <jnf at arcor.de>
-- Stability   :  experimental
-- Portability :  portable
--
--
-- | Module for saving, restoring and editing projectFlags
--
---------------------------------------------------------------------------------


module IDE.PackageFlags (
    readFlags
,   writeFlags
,   editFlags
) where

import Graphics.UI.Gtk
import Control.Monad.Reader
import qualified Text.ParserCombinators.Parsec as P
import Data.List
import System.IO
import qualified Text.PrettyPrint.HughesPJ as PP

import IDE.Core.State
import IDE.Framework.MakeEditor hiding (fieldEditor, parameters)
import IDE.Framework.SimpleEditors
import IDE.Framework.Parameters

import IDE.PrinterParser hiding (fieldParser, parameters)
import IDE.Framework.ViewFrame
import IDE.DescriptionPP

concatString :: [String] -> String
concatString l = foldl (\r s -> if null r then s else r ++ " " ++ s) "" l

flagsDescription :: [(String,[FieldDescriptionPP IDEPackage])]
flagsDescription = [
    ("Flags", [
        mkFieldPP
            (paraName <<<- ParaName "Config flags" $ emptyParams)
            (PP.text . show)
            stringParser
            (\p -> concatString (configFlags p))
            (\ b a -> a{configFlags = if null b then [] else [b]})
            stringEditor
            (\ _ -> return ())
    ,   mkFieldPP
            (paraName <<<- ParaName "Build flags" $ emptyParams)
            (PP.text . show)
            stringParser
            (\p -> concatString (buildFlags p))
            (\ b a -> a{buildFlags = if null b then [] else [b]})
            stringEditor
            (\ _ ->  return ())
    ,   mkFieldPP
            (paraName <<<- ParaName "Haddock flags" $ emptyParams)
            (PP.text . show)
            stringParser
            (\p -> concatString (haddockFlags p))
            (\ b a -> a{haddockFlags = if null b then [] else [b]})
            stringEditor
            (\ _ ->   return ())
    ,   mkFieldPP
            (paraName <<<- ParaName "Executable flags" $ emptyParams)
            (PP.text . show)
            stringParser
            (\p -> concatString (exeFlags p))
            (\ b a -> a{exeFlags = if null b then [] else [b]})
            stringEditor
            (\ _ ->   return ())
    ,   mkFieldPP
            (paraName <<<- ParaName "Install flags" $ emptyParams)
            (PP.text . show)
            stringParser
            (\p -> concatString (installFlags p))
            (\ b a -> a{installFlags = if null b then [] else [b]})
            stringEditor
            (\ _ ->   return ())
    ,   mkFieldPP
            (paraName <<<- ParaName "Register flags" $ emptyParams)
            (PP.text . show)
            stringParser
            (\p -> concatString (registerFlags p))
            (\ b a -> a{registerFlags = if null b then [] else [b]})
            stringEditor
            (\ _ ->   return ())
    ,   mkFieldPP
            (paraName <<<- ParaName "Unregister flags" $ emptyParams)
            (PP.text . show)
            stringParser
            (\p -> concatString (unregisterFlags p))
            (\ b a -> a{unregisterFlags = if null b then [] else [b]})
            stringEditor
            (\ _ ->   return ())
    ,   mkFieldPP
            (paraName <<<- ParaName "Source Distribution flags" $ emptyParams)
            (PP.text . show)
            stringParser
            (\p -> concatString (sdistFlags p))
            (\ b a -> a{sdistFlags = if null b then [] else [b]})
            stringEditor
            (\ _ -> return ())
    ])]

-- ------------------------------------------------------------
-- * Parsing
-- ------------------------------------------------------------

readFlags :: FilePath -> IDEPackage -> IO IDEPackage
readFlags fn pack = do
    res <- P.parseFromFile (flagsParser pack (concatMap snd flagsDescription)) fn
    case res of
        Left pe -> throwIDE $"Error reading flags file " ++ show fn ++ " " ++ show pe
        Right r -> return r

flagsParser ::  a ->  [FieldDescriptionPP a] ->  P.CharParser () a
flagsParser def descriptions =
    let parsersF = map fieldParser descriptions in do
        whiteSpace
        res <-  applyFieldParsers def parsersF
        return res
        P.<?> "flags parser"

-- ------------------------------------------------------------
-- * Printing
-- ------------------------------------------------------------

writeFlags :: FilePath -> IDEPackage -> IO ()
writeFlags fpath flags =
    writeFile fpath (showFlags flags (concatMap snd flagsDescription))

showFlags ::  a ->  [FieldDescriptionPP a] ->  String
showFlags flags flagsDesc = PP.render $
    foldl (\ doc (FDPP _ printer _ _ _ ) ->  doc PP.$+$ printer flags) PP.empty flagsDesc

-- ------------------------------------------------------------
-- * Editing
-- ------------------------------------------------------------

editFlags :: IDEAction
editFlags = do
    ideR <- ask
    mbP <- readIDE activePack
    case mbP of
        Nothing -> return ()
        Just p -> lift $editFlags' p flagsDescription ideR


editFlags' :: IDEPackage -> [(String,[FieldDescriptionPP IDEPackage])] -> IDERef -> IO ()
editFlags' flags flagsDesc ideR  = do
    let flatflagsDesc = concatMap snd flagsDesc
    dialog  <- windowNew
    vb      <- vBoxNew False 0
    bb      <- hButtonBoxNew
    ok      <- buttonNewFromStock "gtk-ok"
    cancel  <- buttonNewFromStock "gtk-cancel"
    boxPackStart bb ok PackNatural 0
    boxPackStart bb cancel PackNatural 0
    nb <- newNotebook
    notebookSetTabPos nb PosTop
    res <- mapM
        (\ (tabLabel, partflagsDesc) -> do
            resList <- mapM (\ fd -> (fieldEditor fd) flags) partflagsDesc
            let (widgetsP, setInjsP, getExtsP,notifiersP) = unzip4 resList
            nbbox <- vBoxNew False 0
            mapM_ (\ w -> boxPackStart nbbox w PackNatural 0) widgetsP
            sw <- scrolledWindowNew Nothing Nothing
            scrolledWindowAddWithViewport sw nbbox
            scrolledWindowSetPolicy sw PolicyAutomatic PolicyAutomatic
            notebookAppendPage nb sw tabLabel
            return (widgetsP, setInjsP, getExtsP, notifiersP))
                flagsDesc
    let (widgets, setInjs, getExts, notifiers) =
            foldl (\ (w,i,e,n) (w2,i2,e2,n2) -> (w ++ w2, i ++ i2, e ++ e2, n ++ n2)) ([],[],[],[]) res
    let fieldNames = map (\fd -> case getParameterPrim paraName (parameters fd) of
                                        Just s -> s
                                        Nothing -> "Unnamed") flatflagsDesc
    ok `onClicked` (do
        mbPackWithNewFlags <- extractAndValidate flags getExts fieldNames
        case mbPackWithNewFlags of
            Nothing -> return ()
            Just packWithNewFlags -> do
                runReaderT (modifyIDE_ (\ide -> return (ide{activePack = Just packWithNewFlags})))
                    ideR -- we don't trigger the activePack event here
                widgetDestroy dialog
                mainQuit)
    cancel `onClicked` (do
        widgetDestroy dialog
        mainQuit)
    boxPackStart vb nb PackGrow 7
    boxPackEnd vb bb PackNatural 7
    containerAdd dialog vb
    widgetSetSizeRequest dialog 500 700
    widgetShowAll dialog
    mainGUI
    return ()