{-# LANGUAGE CPP #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE TypeSynonymInstances #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE OverloadedStrings #-}
-----------------------------------------------------------------------------
--
-- Module      :  IDE.Pane.WebKit.Documentation
-- Copyright   :  2007-2011 Juergen Nicklisch-Franken, Hamish Mackenzie
-- License     :  GPL
--
-- Maintainer  :  maintainer@leksah.org
-- Stability   :  provisional
-- Portability :
--
-- |
--
-----------------------------------------------------------------------------

module IDE.Pane.WebKit.Documentation (
    IDEDocumentation(..)
  , DocumentationState(..)
  , getDocumentation
  , loadDoc
  , reloadDoc
) where

import Prelude ()
import Prelude.Compat
import Graphics.UI.Frame.Panes
       (RecoverablePane(..), PanePath, RecoverablePane, Pane(..))
import Data.Typeable (Typeable)
import Data.Text (Text)
import IDE.Core.Types (IDEAction, IDEM)
import Control.Monad.IO.Class (MonadIO(..))
import Graphics.UI.Frame.ViewFrame (getNotebook)
import IDE.Core.State (reifyIDE)
import IDE.Core.State (reflectIDE)
import Graphics.UI.Editor.Basics (Connection(..))
import GI.Gtk.Objects.ScrolledWindow
       (scrolledWindowSetPolicy, scrolledWindowSetShadowType,
        scrolledWindowNew, ScrolledWindow(..))
#ifdef MIN_VERSION_gi_webkit2
import GI.WebKit2.Objects.WebView
       (webViewReload, webViewGoBack,
        webViewNew, webViewLoadUri, setWebViewZoomLevel, webViewGetUri,
        getWebViewZoomLevel, WebView(..))
#else
import GI.WebKit.Objects.WebView
       (webViewReload, webViewGoBack, webViewZoomOut, webViewZoomIn,
        webViewNew, webViewLoadUri, setWebViewZoomLevel, webViewGetUri,
        getWebViewZoomLevel, WebView(..))
#endif
import GI.Gtk.Objects.Widget
       (onWidgetKeyPressEvent, afterWidgetFocusInEvent, toWidget)
import GI.Gtk.Objects.Adjustment (noAdjustment)
import GI.Gtk.Enums (PolicyType(..), ShadowType(..))
import GI.Gtk.Objects.Container (containerAdd)
import GI.Gdk (getEventKeyState, keyvalName, getEventKeyKeyval)
import GI.Gdk.Flags (ModifierType(..))
import System.Log.Logger (debugM)

data IDEDocumentation = IDEDocumentation {
    scrolledView :: ScrolledWindow
  , webView      :: WebView
} deriving Typeable

data DocumentationState = DocumentationState {
    zoom :: Double
  , uri  :: Maybe Text
} deriving(Eq,Ord,Read,Show,Typeable)

instance Pane IDEDocumentation IDEM
    where
    primPaneName _  =   "Doc"
    getAddedIndex _ =   0
    getTopWidget    =   liftIO . toWidget . scrolledView
    paneId b        =   "*Doc"

instance RecoverablePane IDEDocumentation DocumentationState IDEM where
    saveState p = do
        zoom <- fmap realToFrac <$> getWebViewZoomLevel $ webView p
        uri  <- webViewGetUri $ webView p
        return (Just DocumentationState{..})
    recoverState pp DocumentationState {..} = do
        nb     <-  getNotebook pp
        mbPane <- buildPane pp nb builder
        case mbPane of
            Nothing -> return ()
            Just p  -> do
                setWebViewZoomLevel (webView p) (realToFrac zoom)
                maybe (return ()) (webViewLoadUri (webView p)) uri
        return mbPane
    builder pp nb windows = reifyIDE $ \ ideR -> do
        scrolledView <- scrolledWindowNew noAdjustment noAdjustment
        scrolledWindowSetShadowType scrolledView ShadowTypeIn

        webView <- webViewNew
        containerAdd scrolledView webView

        scrolledWindowSetPolicy scrolledView PolicyTypeAutomatic PolicyTypeAutomatic
        let docs = IDEDocumentation {..}

        cid1 <- ConnectC webView <$> afterWidgetFocusInEvent webView (\e -> do
            liftIO $ reflectIDE (makeActive docs) ideR
            return True)

        cid2 <- ConnectC webView <$> onWidgetKeyPressEvent webView (\e -> do
            key <- getEventKeyKeyval e >>= keyvalName
            mod <- getEventKeyState e
            case (key, mod) of
                (Just "plus", [ModifierTypeShiftMask,ModifierTypeControlMask]) -> do
                    zoom <- getWebViewZoomLevel webView
                    setWebViewZoomLevel webView (zoom * 1.25)
                    return True
                (Just "minus",[ModifierTypeControlMask]) -> do
                    zoom <- getWebViewZoomLevel webView
                    setWebViewZoomLevel webView (zoom * 0.8)
                    return True
                (Just "BackSpace", []) -> webViewGoBack webView >> return True
                _                      -> return False)
        return (Just docs, [cid1, cid2])


getDocumentation :: Maybe PanePath -> IDEM IDEDocumentation
getDocumentation Nothing    = forceGetPane (Right "*Doc")
getDocumentation (Just pp)  = forceGetPane (Left pp)

loadDoc :: Text -> IDEAction
loadDoc uri =
     do doc <- getDocumentation Nothing
        let view = webView doc
        webViewLoadUri view uri

reloadDoc :: IDEAction
reloadDoc =
     do doc <- getDocumentation Nothing
        let view = webView doc
        webViewReload view