module Yi.Config where

import qualified Data.Map as M
import Data.Prototype

import {-# source #-} Yi.Buffer
import {-# source #-} Yi.Keymap
import {-# source #-} Yi.Editor
import Yi.Dynamic
import Data.Dynamic
import Yi.Event
import Yi.Style
import Yi.Style.Library
import {-# source #-} Yi.UI.Common
import Data.Binary

data UIConfig = UIConfig {
   configFontName :: Maybe String,  -- ^ Font name, for the UI that support it.
   configFontSize :: Maybe Int,     -- ^ Font size, for the UI that support it.
   configLeftSideScrollBar :: Bool, -- ^ Should the scrollbar be shown on the left side?
   configAutoHideScrollBar :: Bool, -- ^ Hide scrollbar automatically if text fits on one page.
   configLineWrap :: Bool,          -- ^ Wrap lines at the edge of the window if too long to display.
   configWindowFill :: !Char,
   -- ^ The char with which to fill empty window space.  Usually '~' for vi-like
   -- editors, ' ' for everything else.
   configTheme :: Theme             -- ^ UI colours
  }

configStyle :: UIConfig -> UIStyle
configStyle = extractValue . configTheme

{- | Currently duplicates some of Vim's indent settings. Allowing a buffer to
 - specify settings that are more dynamic, perhaps via closures, could be
 - useful.
 -}
data IndentSettings = IndentSettings { expandTabs :: Bool -- ^ Insert spaces instead of tabs as possible
                                     , tabSize    :: Int  -- ^ Size of a Tab
                                     , shiftWidth :: Int  -- ^ Indent by so many columns 
                                     }
                      deriving (Eq, Show, Typeable {-! Binary !-})




instance Initializable IndentSettings where
    initial = error "IndentSettings should be initialized from Config."

instance Binary IndentSettings



-- | Configuration record. All Yi hooks can be set here.
data Config = Config {startFrontEnd :: UIBoot,
                      -- ^ UI to use.
                      configUI :: UIConfig,
                      -- ^ UI-specific configuration.
                      startActions :: [Action],
                      -- ^ Actions to run when the editor is started.
                      defaultKm :: Keymap,
                      -- ^ Default keymap to use.
                      modeTable :: [AnyMode],
                      -- ^ List modes by order of preference.
                      fundamentalMode :: (forall syntax. Mode syntax),
                      publishedActions :: M.Map String [Data.Dynamic.Dynamic],
                      -- ^ Actions available in the "interpreter" (akin to M-x in emacs)
                      debugMode :: Bool,
                      -- ^ Produce a .yi.dbg file with a lot of debug information.
                      configKillringAccumulate :: !Bool,
                      -- ^ Set to 'True' for an emacs-like behaviour, where 
                      -- all deleted text is accumulated in a killring.
                      configIndentSettings :: IndentSettings
                      -- IndentSettings should perhaps be in Mode?
                     }

type UIBoot = Config -> (Event -> IO ()) -> ([Action] -> IO ()) ->  Editor -> IO UI