{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE TypeSynonymInstances #-}

{-# OPTIONS_GHC -fno-warn-orphans  #-}

module IHaskell.Display.Widgets.Button
  ( -- * The Button Widget
    Button
    -- * Create a new button
  , mkButton
  ) where

-- To keep `cabal repl` happy when running from the ihaskell repo
import           Prelude

import           Data.Aeson
import           Data.IORef (newIORef)
import           Data.Vinyl (Rec(..), (<+>))

import           IHaskell.Display
import           IHaskell.Eval.Widgets
import           IHaskell.IPython.Message.UUID as U

import           IHaskell.Display.Widgets.Types
import           IHaskell.Display.Widgets.Common
import           IHaskell.Display.Widgets.Style.ButtonStyle
import           IHaskell.Display.Widgets.Layout.LayoutWidget

-- | A 'Button' represents a Button from IPython.html.widgets.
type Button = IPythonWidget 'ButtonType

-- | Create a new button
mkButton :: IO Button
mkButton :: IO Button
mkButton = do
  -- Default properties, with a random uuid
  UUID
wid <- IO UUID
U.random
  IPythonWidget 'LayoutType
layout <- IO (IPythonWidget 'LayoutType)
mkLayout
  ButtonStyle
btnstyle <- IO ButtonStyle
mkButtonStyle

  let ddw :: Rec Attr DescriptionWidgetClass
ddw = FieldType 'ViewName
-> FieldType 'ModelName
-> IPythonWidget 'LayoutType
-> StyleWidget
-> Rec Attr DescriptionWidgetClass
defaultDescriptionWidget Text
"ButtonView" Text
"ButtonModel" IPythonWidget 'LayoutType
layout forall a b. (a -> b) -> a -> b
$ forall (w :: WidgetType).
RecAll Attr (WidgetFields w) ToPairs =>
IPythonWidget w -> StyleWidget
StyleWidget ButtonStyle
btnstyle
      but :: Rec Attr '[ 'Disabled, 'Icon, 'ButtonStyle, 'ClickHandler]
but = (forall {a :: Field}. (a ~ 'Disabled) => SField a
Disabled forall (f :: Field).
(SingI f, Typeable (FieldType f)) =>
Sing f -> FieldType f -> Attr f
=:: Bool
False)
            forall {u} (a :: u -> *) (r :: u) (rs :: [u]).
a r -> Rec a rs -> Rec a (r : rs)
:& (forall {a :: Field}. (a ~ 'Icon) => SField a
Icon forall (f :: Field).
(SingI f, Typeable (FieldType f)) =>
Sing f -> FieldType f -> Attr f
=:: Text
"")
            forall {u} (a :: u -> *) (r :: u) (rs :: [u]).
a r -> Rec a rs -> Rec a (r : rs)
:& (forall {a :: Field}. (a ~ 'ButtonStyle) => SField a
ButtonStyle forall (f :: Field).
(SingI f, Typeable (FieldType f)) =>
Sing f -> FieldType f -> Attr f
=:: ButtonStyleValue
DefaultButton)
            forall {u} (a :: u -> *) (r :: u) (rs :: [u]).
a r -> Rec a rs -> Rec a (r : rs)
:& (forall {a :: Field}. (a ~ 'ClickHandler) => SField a
ClickHandler forall (f :: Field).
(SingI f, Typeable (FieldType f)) =>
Sing f -> FieldType f -> Attr f
=:: forall (m :: * -> *) a. Monad m => a -> m a
return ())
            forall {u} (a :: u -> *) (r :: u) (rs :: [u]).
a r -> Rec a rs -> Rec a (r : rs)
:& forall {u} (a :: u -> *). Rec a '[]
RNil
      buttonState :: WidgetState 'ButtonType
buttonState = forall (w :: WidgetType).
Rec Attr (WidgetFields w) -> WidgetState w
WidgetState (Rec
  Attr
  '[ 'ViewModule, 'ViewModuleVersion, 'ModelModule,
     'ModelModuleVersion, 'ModelName, 'ViewName, 'DOMClasses, 'Tooltip,
     'Layout, 'DisplayHandler, 'Description, 'Style]
ddw forall {k} (f :: k -> *) (as :: [k]) (bs :: [k]).
Rec f as -> Rec f bs -> Rec f (as ++ bs)
<+> Rec Attr '[ 'Disabled, 'Icon, 'ButtonStyle, 'ClickHandler]
but)

  IORef (WidgetState 'ButtonType)
stateIO <- forall a. a -> IO (IORef a)
newIORef WidgetState 'ButtonType
buttonState

  let button :: Button
button = forall (w :: WidgetType).
UUID -> IORef (WidgetState w) -> IPythonWidget w
IPythonWidget UUID
wid IORef (WidgetState 'ButtonType)
stateIO

  -- Open a comm for this widget, and store it in the kernel state
  forall a. IHaskellWidget a => a -> Value -> IO ()
widgetSendOpen Button
button forall a b. (a -> b) -> a -> b
$ forall a. ToJSON a => a -> Value
toJSON WidgetState 'ButtonType
buttonState

  -- Return the button widget
  forall (m :: * -> *) a. Monad m => a -> m a
return Button
button

instance IHaskellWidget Button where
  getCommUUID :: Button -> UUID
getCommUUID = forall (w :: WidgetType). IPythonWidget w -> UUID
uuid
  comm :: Button -> Value -> (Value -> IO ()) -> IO ()
comm Button
widget Value
val Value -> IO ()
_ =
    case Value -> [Text] -> Maybe Value
nestedObjectLookup Value
val [Text
"content", Text
"event"] of
      Just (String Text
"click") -> forall (w :: WidgetType).
('ClickHandler ∈ WidgetFields w) =>
IPythonWidget w -> IO ()
triggerClick Button
widget
      Maybe Value
_ -> forall (f :: * -> *) a. Applicative f => a -> f a
pure ()