{-# OPTIONS_GHC -XDeriveDataTypeable -XMultiParamTypeClasses
    -XScopedTypeVariables -XTypeSynonymInstances #-}
-----------------------------------------------------------------------------
--
-- Module      :  IDE.Pane.Info
-- Copyright   :  (c) Juergen Nicklisch-Franken, Hamish Mackenzie
-- License     :  GNU-GPL
--
-- Maintainer  :  <maintainer at leksah.org>
-- Stability   :  provisional
-- Portability :  portable
--
-- | The GUI stuff for infos
--
-------------------------------------------------------------------------------

module IDE.Pane.Info (
    IDEInfo
,   InfoState
,   setInfo
,   setSymbol
,   replayInfoHistory
,   showInfo
) where

import Graphics.UI.Gtk hiding (afterToggleOverwrite)
import Control.Monad
import Control.Monad.Trans
import Data.Maybe
import Data.IORef
import Data.Typeable

import IDE.Core.State
import IDE.Pane.SourceBuffer
import IDE.Pane.References
import IDE.FileUtils (openBrowser)
import IDE.Metainfo.Provider (getIdentifierDescr)
import Graphics.UI.Gtk.SourceView


-- | An info pane description
--
data IDEInfo        =   IDEInfo {
    sw              ::   VBox
,   currentDescr    ::   IORef Descr
,   descriptionView ::   SourceView
} deriving Typeable

data InfoState              =   InfoState Descr
    deriving(Eq,Ord,Read,Show,Typeable)


instance IDEObject IDEInfo

instance Pane IDEInfo IDEM
    where
    primPaneName _  =   "Info"
    getAddedIndex _ =   0
    getTopWidget    =   castToWidget . sw
    paneId b        =   "*Info"
    makeActive pane =   activatePane pane []
    close           =   closePane

instance RecoverablePane IDEInfo InfoState IDEM where
    saveState p     =   do
        currentDescr' <-  liftIO $ readIORef (currentDescr p)
        return (Just (InfoState currentDescr'))
    recoverState pp (InfoState descr) =   do
        nb <- getNotebook pp
        prefs <- readIDE prefs
        newPane pp nb (builder descr prefs)
        return ()

showInfo :: IDEAction
showInfo = do
    mbInfo :: Maybe IDEInfo <- getPane
    case mbInfo of
        Nothing -> return ()
        Just p  -> liftIO $ bringPaneToFront p

builder :: Descr ->
    Prefs ->
    PanePath ->
    Notebook ->
    Window ->
    IDERef ->
    IO (IDEInfo,Connections)
builder idDescr prefs pp nb windows ideR = do
    ibox        <- vBoxNew False 0
-- Buttons
    bb          <- hButtonBoxNew
    buttonBoxSetLayout bb ButtonboxSpread
    definitionB <- buttonNewWithLabel "Source"
    moduB       <- buttonNewWithLabel "Modules"
    usesB       <- buttonNewWithLabel "Refs"
    docuB       <- buttonNewWithLabel "Docu"
    searchB     <- buttonNewWithLabel "Search"
    boxPackStartDefaults bb definitionB
    boxPackStartDefaults bb moduB
    boxPackStartDefaults bb usesB
    boxPackStartDefaults bb docuB
    boxPackStartDefaults bb searchB
-- Descr View
    font <- case textviewFont prefs of
        Just str -> do
            fontDescriptionFromString str
        Nothing -> do
            f <- fontDescriptionNew
            fontDescriptionSetFamily f "Monospace"
            return f

    descriptionView <- sourceViewNew
    descriptionBuffer <- (get descriptionView textViewBuffer) >>= (return . castToSourceBuffer)
    lm <- sourceLanguageManagerNew
    mbLang <- sourceLanguageManagerGuessLanguage lm Nothing (Just "text/x-haskell")
    case mbLang of
        Nothing -> return ()
        Just lang -> do sourceBufferSetLanguage descriptionBuffer lang

    -- This call is here because in the past I have had problems where the
    -- language object became invalid if the manager was garbage collected
    sourceLanguageManagerGetLanguageIds lm

    sourceBufferSetHighlightSyntax descriptionBuffer True
    widgetModifyFont descriptionView (Just font)

    case sourceStyle prefs of
        Nothing  -> return ()
        Just str -> do
            styleManager <- sourceStyleSchemeManagerNew
            ids <- sourceStyleSchemeManagerGetSchemeIds styleManager
            when (elem str ids) $ do
                scheme <- sourceStyleSchemeManagerGetScheme styleManager str
                sourceBufferSetStyleScheme descriptionBuffer scheme


    sw <- scrolledWindowNew Nothing Nothing
    containerAdd sw descriptionView
    scrolledWindowSetPolicy sw PolicyAutomatic PolicyAutomatic

    boxPackStart ibox sw PackGrow 10
    boxPackEnd ibox bb PackNatural 10

    --openType
    currentDescr' <- newIORef idDescr
    let info = IDEInfo ibox currentDescr' descriptionView
    definitionB `onClicked` (reflectIDE gotoSource ideR )
    moduB `onClicked` (reflectIDE gotoModule' ideR )
    usesB `onClicked` (reflectIDE referencedFrom' ideR )
    searchB `onClicked` (do
        descr <- readIORef currentDescr'
        reflectIDE (do
            triggerEventIDE (SearchMeta (descrName descr))
            showInfo) ideR )
    docuB `onClicked` (do
        descr <- readIORef currentDescr'
        reflectIDE (openBrowser $ docuSearchURL prefs ++ descrName descr) ideR)
    descriptionView `widgetAddEvents` [ButtonReleaseMask]
    id5 <- descriptionView `onButtonRelease`
        (\ e -> do
            buf     <-  textViewGetBuffer descriptionView
            (l,r)   <- textBufferGetSelectionBounds buf
            symbol  <- textBufferGetText buf l r True
            when (controlIsPressed e)
                (reflectIDE (do
                    triggerEventIDE (SelectInfo symbol)
                    return ()) ideR)
            return False)
    return (info,[])

gotoSource :: IDEAction
gotoSource = do
    mbInfo <- getInfoCont
    case mbInfo of
        Nothing     ->  do  ideMessage Normal "gotoSource:noDefition"
                            return ()
        Just info   ->  goToDefinition info >> return ()

gotoModule' :: IDEAction
gotoModule' = do
    mbInfo  <-  getInfoCont
    case mbInfo of
        Nothing     ->  return ()
        Just info   ->  triggerEventIDE (SelectIdent info) >> return ()

referencedFrom' :: IDEAction
referencedFrom' = do
    mbInfo <- getInfoCont
    case mbInfo of
        Nothing     ->  return ()
        Just info   ->  referencedFrom info  >> return ()

setSymbol :: String -> IDEAction
setSymbol symbol = do
    currentInfo' <- readIDE currentInfo
    case currentInfo' of
        Nothing -> return ()
        Just ((_,symbolTable1),(_,symbolTable2)) ->
            case getIdentifierDescr symbol symbolTable1 symbolTable2 of
                []     -> return ()
                (a:r)  ->  do
                    setInfo a
                    showInfo
                    if length (a:r) > 1
                        then triggerEventIDE (DescrChoice (a:r)) >> return ()
                        else triggerEventIDE (SelectIdent a) >> return ()


setInfo :: Descr -> IDEAction
setInfo identifierDescr = do
    mbPane <-  getPane
    case mbPane of
        Nothing -> do
            pp      <- getBestPathForId "*Info"
            nb      <- getNotebook pp
            prefs   <- readIDE prefs
            newPane pp nb (builder identifierDescr prefs)
            return ()
        Just info -> do
            oldDescr <- liftIO $ readIORef (currentDescr info)
            liftIO $ do
                writeIORef (currentDescr info) identifierDescr
                tb <- get (descriptionView info) textViewBuffer
                textBufferSetText tb (show (Present identifierDescr))
            recordInfoHistory identifierDescr oldDescr

getInfoCont ::  IDEM (Maybe (Descr))
getInfoCont = do
    mbPane <- getPane
    case mbPane of
        Nothing ->  return Nothing
        Just p  ->  liftIO $ readIORef (currentDescr p) >>= return . Just


-- * GUI History

recordInfoHistory :: Descr -> Descr -> IDEAction
recordInfoHistory  descr oldDescr = do
    triggerEventIDE (RecordHistory
        ((InfoElementSelected descr),
         (InfoElementSelected oldDescr)))
    return ()

replayInfoHistory :: Descr -> IDEAction
replayInfoHistory descr = do
    setInfo descr