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module Gargantext.Utils.Reactix where

import Prelude
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import ConvertableOptions as CO
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import DOM.Simple as DOM
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import DOM.Simple.Console (log2)
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import DOM.Simple.Document (document)
import DOM.Simple.Element as Element
import DOM.Simple.Event as DE
import DOM.Simple.Types (class IsNode, class IsElement, DOMRect)
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import Data.Array as A
import Data.Either (hush)
import Data.Function.Uncurried (Fn1, runFn1, Fn2, runFn2)
import Data.Maybe (Maybe(..), fromJust, fromMaybe)
import Data.Nullable (Nullable, null, toMaybe)
import Data.Tuple (Tuple)
import Data.Tuple.Nested ((/\))
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import Effect (Effect)
import Effect.Aff (Aff, launchAff, launchAff_, killFiber)
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import Effect.Class (liftEffect)
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import Effect.Exception (error)
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import Effect.Uncurried (EffectFn1, EffectFn3, mkEffectFn1, mkEffectFn2, runEffectFn1, runEffectFn3)
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import FFI.Simple ((..), (...), (.=), defineProperty, delay, args2, args3)
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import Partial.Unsafe (unsafePartial)
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import React (class ReactPropFields, Children, ReactClass, ReactElement)
import React as React
import Reactix as R
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import Reactix.DOM.HTML (ElemFactory, createDOM, text)
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import Reactix.DOM.HTML as H
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import Reactix.React (react)
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import Reactix.SyntheticEvent as RE
import Reactix.Utils (currySecond, hook, tuple)
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import Simple.JSON as JSON
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import Toestand as T
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import Unsafe.Coerce (unsafeCoerce)
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import Web.File.Blob (Blob)
import Web.File.File as WF
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import Web.File.FileList (FileList, item)
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import Web.HTML (window)
import Web.HTML.Window (localStorage)
import Web.Storage.Storage (Storage, getItem, setItem)
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-- | UI Component type with only required props and children
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type Component p = Record p -> Array R.Element -> R.Element

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-- | UI Component type with only required props and no child
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type Leaf p = Record p -> R.Element

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leafComponent :: forall cpt p. (R.Component p) -> Record p -> R.Element
leafComponent cpt p = R.createElement cpt p []

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-- | UI Component type containing optional props and children
type OptComponent options props provided = CO.Defaults (Record options) (Record provided) (Record props)
  => Record provided -> Array R.Element -> R.Element

-- | UI Component type containing optional props and no child
type OptLeaf options props provided = CO.Defaults (Record options) (Record provided) (Record props)
  => Record provided -> R.Element

component :: forall cpt p. R.IsComponent cpt p (Array R.Element)
  => cpt -> Record p -> Array R.Element -> R.Element
component cpt props children = R.createElement cpt props children

leaf :: forall cpt p. R.IsComponent cpt p (Array R.Element)
  => cpt -> Record p -> R.Element
leaf cpt props = R.createElement cpt props []

optComponent :: forall r r' cpt p.
     CO.Defaults r r' (Record p)
  => R.IsComponent cpt p (Array R.Element)
  => cpt -> r -> r' -> Array R.Element -> R.Element
optComponent cpt options props children = R.createElement cpt props' children where
  props' = CO.defaults options props

optLeaf :: forall r r' cpt p.
     CO.Defaults r r' (Record p)
  => R.IsComponent cpt p (Array R.Element)
  => cpt -> r -> r' -> R.Element
optLeaf cpt options props = R.createElement cpt props' [] where
  props' = CO.defaults options props

-----------------------------------------

type Module = String

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type Here =
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  { component   :: forall p. String -> R.HooksComponent p -> R.Component p
  , log         :: forall l. l -> Effect Unit
  , log2        :: forall l. String -> l -> Effect Unit
  , ntComponent :: forall p. String -> NTHooksComponent p -> NTComponent p }
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here :: Module -> Here
here mod =
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  { component:   R.hooksComponentWithModule mod
  , log:         log2 ("[" <> mod <> "]")
  , log2:        \msg -> log2 ("[" <> mod <> "] " <> msg)
  , ntComponent: ntHooksComponentWithModule mod }
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-- newtypes
type NTHooksComponent props = props -> Array R.Element -> R.Hooks R.Element
newtype NTComponent p = NTComponent (EffectFn1 p R.Element)

class NTIsComponent component (props :: Type) children
  | component -> props, component -> children where
  ntCreateElement :: component -> props -> children -> R.Element

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instance componentIsNTComponent
  :: NTIsComponent (NTComponent props) props (Array R.Element) where
    ntCreateElement = R.rawCreateElement
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-- | Turns a `HooksComponent` function into a Component
ntHooksComponent :: forall props. String -> NTHooksComponent props -> NTComponent props
ntHooksComponent name c = NTComponent $ named name $ mkEffectFn1 c'
  where
    c' :: props -> Effect R.Element
    c' props = R.runHooks $ c props (children props)

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ntHooksComponentWithModule
 :: forall props. Module -> String -> NTHooksComponent props -> NTComponent props
ntHooksComponentWithModule module' name c =
  ntHooksComponent (module' <> "." <> name) c
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---------------------------
-- TODO Copied from reactix, export these:
children :: forall a. a -> Array R.Element
children a = react .. "Children" ... "toArray" $ [ (a .. "children") ]

---------------------------

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newtype Point = Point { x :: Number, y :: Number }

-- a reducer function living in effector, for useReductor
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type Actor s a = (a -> s -> Effect s)
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-- | Turns a ReactElement into aReactix Element
-- | buff (v.) to polish
buff :: ReactElement -> R.Element
buff = unsafeCoerce

-- | Turns a Reactix Element into a ReactElement.
-- | scuff (v.) to spoil the gloss or finish of.
scuff :: R.Element -> ReactElement
scuff = unsafeCoerce

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-- class ToElement a where
--   toElement :: a -> R.Element
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-- instance ToElement R.Element where
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--   toElement = identity
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-- instance ToElement ReactElement where
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--   toElement = buff
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-- instance ToElement a => ToElement (Array a) where
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--   toElement = R.fragment <<< map toElement
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createElement' :: forall required given
                . ReactPropFields required given
               => ReactClass { children :: Children | required }
               -> Record given -> Array R.Element -> R.Element
createElement' reactClass props children =
  buff $ React.createElement reactClass props $ scuff <$> children

{-
instance isComponentReactClass
      :: R.IsComponent (ReactClass { children :: Children
                                   | props
                                   }) props (Array R.Element) where
  createElement reactClass props children =
    React.createElement reactClass props children
-}

-- | Turns an aff into a useEffect-compatible Effect (Effect Unit)
affEffect :: forall a. String -> Aff a -> Effect (Effect Unit)
affEffect errmsg aff = do
    fiber <- launchAff aff
    pure $ launchAff_ $ killFiber (error errmsg) fiber

mousePosition :: RE.SyntheticEvent DE.MouseEvent -> Point
mousePosition e = Point { x: RE.clientX e, y: RE.clientY e }

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mouseClickInElement :: DE.MouseEvent -> DOM.Element -> Boolean
mouseClickInElement e el = x <= cx && cx <= x + width && y <= cy && cy <= y + height
  where
    { x, y, width, height } = Element.boundingRect el
    cx = DE.clientX e
    cy = DE.clientY e

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domMousePosition :: DE.MouseEvent -> Point
domMousePosition = mousePosition <<< unsafeCoerce
-- | This is naughty, it quietly mutates the input and returns it
named :: forall o. String -> o -> o
named = flip $ defineProperty "name"

overState :: forall t. (t -> t) -> R.State t -> Effect Unit
overState f (_state /\ setState) = setState f

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small :: ElemFactory
small = createDOM "small"

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select :: ElemFactory
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select = createDOM "select"
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menu :: ElemFactory
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menu = createDOM "menu"
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frame :: ElemFactory
frame = createDOM "frame"

frameset :: ElemFactory
frameset = createDOM "frameset"

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keyCode :: forall event. event -> Effect Int
keyCode = runEffectFn1 _keyCode

foreign import _keyCode
  :: forall e. EffectFn1 e Int

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nullRef :: forall t. R.Hooks (R.Ref (Nullable t))
nullRef = R.useRef null

nothingRef :: forall t. R.Hooks (R.Ref (Maybe t))
nothingRef = R.useRef Nothing

useLayoutEffect1' :: forall a. a -> (Unit -> Effect Unit) -> R.Hooks Unit
useLayoutEffect1' a f = R.useLayoutEffect1 a $ do
  liftEffect $ f unit
  pure $ pure unit

useLayoutRef :: forall a b. (a -> b) -> b -> R.Ref a -> R.Hooks (R.Ref b)
useLayoutRef fn init ref = do
  new <- R.useRef init
  let old = R.readRef ref
  useLayoutEffect1' old $ \_ -> R.setRef new (fn old)
  pure new

usePositionRef :: R.Ref (Nullable DOM.Element) -> R.Hooks (R.Ref (Maybe DOM.DOMRect))
usePositionRef = useLayoutRef (map Element.boundingRect <<< toMaybe) Nothing

readPositionRef :: R.Ref (Nullable DOM.Element) -> Maybe DOM.DOMRect
readPositionRef el = do
  let posRef = R.readRef el
  Element.boundingRect <$> toMaybe posRef

getElementById :: String -> Effect (Maybe DOM.Element)
getElementById = (flip delay) h
  where
    h id = pure $ toMaybe $ document ... "getElementById" $ [id]
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-- We just assume it works, so make sure it's in the html
getPortalHost :: R.Hooks DOM.Element
getPortalHost = R.unsafeHooksEffect $ delay unit $ \_ -> pure $ document ... "getElementById" $ ["portal"]

useLayoutEffectOnce :: Effect (Effect Unit) -> R.Hooks Unit
useLayoutEffectOnce e = R.unsafeUseLayoutEffect e []

singleParent :: forall props. R.Component props -> Record props -> R.Element -> R.Element
singleParent cpt props child = R.createElement cpt props [ child ]

childless :: forall props. R.Component props -> Record props -> R.Element
childless cpt props = R.createElement cpt props []

showText :: forall s. Show s => s -> R.Element
showText = text <<< show

----- Reactix's new effectful reducer: sneak-peek because anoe wants to demo on tuesday

-- | Like a reducer, but lives in Effect
type Reductor state action = Tuple state (action -> Effect Unit)

-- | Like useReductor, but lives in Effect
useReductor :: forall s a i. Actor s a -> (i -> Effect s) -> i -> R.Hooks (Reductor s a)
useReductor f i j =
  hook $ \_ ->
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    pure $ currySecond $ tuple $ react ... "useReducer" $ args3 (mkEffectFn2 (flip f)) j (mkEffectFn1 i)
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-- | Like `useReductor`, but takes an initial state instead of an
-- | initialiser function and argument
useReductor' :: forall s a. Actor s a -> s -> R.Hooks (Reductor s a)
useReductor' r = useReductor r pure

render :: R.Element -> DOM.Element -> Effect Unit
render e d = delay unit $ \_ -> pure $ R.reactDOM ... "render" $ args2 e d
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addRootElement :: DOM.Element -> Effect Unit
addRootElement = runEffectFn1 _addRootElement

foreign import _addRootElement
  :: EffectFn1 DOM.Element Unit

appendChild :: forall n m. IsNode n => IsNode m => n -> m -> Effect Unit
appendChild n c = delay unit $ \_ -> pure $ n ... "appendChild" $ [c]
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appendChildToParentId :: forall c. IsNode c => String -> c -> Effect Unit
appendChildToParentId ps c = delay unit $ \_ -> do
  parentEl <- getElementById ps
  case parentEl of
    Nothing -> pure unit
    Just el -> appendChild el c
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effectLink :: Effect Unit -> String -> R.Element
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effectLink eff msg = H.a { on: {click: const eff} } [H.text msg]
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useCache :: forall i o. Eq i => i -> (i -> R.Hooks o) -> R.Hooks o
useCache i f = do
  iRef <- R.useRef Nothing
  oRef <- R.useRef Nothing
  let currI = R.readRef iRef
  let currO = R.readRef oRef
  if currI == Just i then
    case currO of
      Nothing -> f i -- this one shouldn't happen, but purescript
      Just v -> pure v
  else do
    new <- f i
    R.unsafeHooksEffect (R.setRef iRef $ Just i)
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    R.unsafeHooksEffect (R.setRef oRef $ Just new)
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    pure new
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inputFile :: forall e. Int -> e -> Maybe WF.File
inputFile n e = item n $ ((el .. "files") :: FileList)
  where
    el = e .. "target"

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-- | Get blob from an 'onchange' e.target event
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inputFileBlob n e = unsafePartial $ do
  let ff = fromJust $ inputFile n e
  pure $ WF.toBlob ff

inputFileNameWithBlob :: forall e. Int -> e -> Maybe {blob :: Blob, name :: String}
inputFileNameWithBlob n e = case ff of
    Nothing -> Nothing
    Just f  -> Just {blob: WF.toBlob f, name: WF.name f}
  where
    ff = inputFile n e
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foreign import _preventDefault :: forall e. EffectFn1 e Unit
preventDefault :: forall e. DE.IsEvent e => e -> Effect Unit
preventDefault = runEffectFn1 _preventDefault

foreign import _stopPropagation :: forall e. EffectFn1 e Unit
stopPropagation :: forall e. DE.IsEvent e => e -> Effect Unit
stopPropagation = runEffectFn1 _stopPropagation

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-- | Get blob from a drop event
--dataTransferFileBlob :: forall e. DE.IsEvent e => RE.SyntheticEvent e -> Effect Blob
dataTransferFileBlob e = unsafePartial $ do
    let ff = fromJust $ item 0 $ ((e .. "dataTransfer" .. "files") :: FileList)
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    pure $ WF.toBlob ff
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foreign import _blur :: EffectFn1 DOM.Element Unit
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blur :: DOM.Element -> Effect Unit
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blur = runEffectFn1 _blur
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row :: Array R.Element -> R.Element
row children = H.div { className: "row" } children

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col :: Int -> Array R.Element -> R.Element
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col n children = H.div { className : "col-md-" <> show n } children
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innerText :: DOM.Element -> String
innerText e = e .. "innerText"

foreign import data Selection :: Type

getSelection :: Unit -> Effect Selection
getSelection = runEffectFn1 _getSelection

foreign import _getSelection :: EffectFn1 Unit Selection
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stringify :: forall a. a -> Int -> String
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stringify j indent = runFn2 _stringify j indent

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foreign import _stringify :: forall a. Fn2 a Int String
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getls :: Effect Storage
getls = window >>= localStorage

openNodesKey :: LocalStorageKey
openNodesKey = "garg-open-nodes"

type LocalStorageKey = String

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loadLocalStorageState :: forall s. JSON.ReadForeign s => LocalStorageKey -> T.Box s -> Effect Unit
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loadLocalStorageState key cell = do
  storage <- getls
  item :: Maybe String <- getItem key storage
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  -- let json = hush <<< Argonaut.jsonParser =<< item
  -- let parsed = hush <<< Argonaut.decodeJson =<< json
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  let parsed = hush <<< JSON.readJSON $ fromMaybe "" item
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  case parsed of
    Nothing -> pure unit
    Just p  -> void $ T.write p cell

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listenLocalStorageState :: forall s. JSON.WriteForeign s => LocalStorageKey -> T.Change s -> Effect Unit
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listenLocalStorageState key { old, new } = do
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  --let json = Json.stringify $ Argonaut.encodeJson new
  let json = JSON.writeJSON new
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  storage <- getls
  setItem key json storage
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getMessageDataStr :: DE.MessageEvent -> String
getMessageDataStr = getMessageData

getMessageOrigin :: DE.MessageEvent -> String
getMessageOrigin me = me .. "origin"

getMessageData :: forall o. DE.MessageEvent -> o
getMessageData me = me .. "data"

foreign import _postMessage
  :: forall r. EffectFn3 r String String Unit

postMessage :: forall r. R.Ref (Nullable r) -> String -> Effect Unit
postMessage ref msg = do
  case (R.readNullableRef ref) of
    (Just ifr) -> do
      runEffectFn3 _postMessage ifr msg (ifr .. "src")
    (Nothing) -> pure unit
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foreign import _setCookie :: EffectFn1 String Unit

setCookie :: String -> Effect Unit
setCookie = runEffectFn1 _setCookie
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focus :: Nullable R.Element -> Effect Unit
focus nEl = case toMaybe nEl of
  Nothing -> pure unit
  Just el -> el ... "focus" $ []
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setIndeterminateCheckbox :: R.Element -> Boolean -> Effect R.Element
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setIndeterminateCheckbox el val = pure $ (el .= "indeterminate") val
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-- A "trigger" is a ref to a function which is used to make changes without
-- modifying too much DOM.
-- This is to escape passing explicit state to nested child components.
type Trigger a = R.Ref (Maybe (a -> Effect Unit))

callTrigger :: forall a. Trigger a -> a -> Effect Unit
callTrigger tRef arg = case R.readRef tRef of
  Nothing -> do
    log2 "[callTrigger] trigger is empty" tRef
    pure unit
  Just t  -> t arg

setTrigger :: forall a. Trigger a -> (a -> Effect Unit) -> Effect Unit
setTrigger tRef fun = R.setRef tRef $ Just fun

clearTrigger :: forall a. Trigger a -> Effect Unit
clearTrigger tRef = R.setRef tRef Nothing
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type Rect =
  ( x :: Number
  , y :: Number
  , width :: Number
  , height :: Number )

foreign import _domRectFromRect :: Fn1 (Record Rect) DOMRect

domRectFromRect :: Record Rect -> DOMRect
domRectFromRect = runFn1 _domRectFromRect

boundingRect :: forall e. IsElement e => Array e -> DOMRect
boundingRect els =
  case A.uncons els of
    Nothing -> domRectFromRect { x: 0.0, y: 0.0, width: 0.0, height: 0.0 }
    Just { head, tail } ->
      let br = Element.boundingRect head
      in
      case tail of
        [] -> br
        _  ->
          let brs = boundingRect tail
              minx = min br.left brs.left
              maxx = max br.right brs.right
              miny = min br.top brs.top
              maxy = max br.bottom brs.bottom
          in
           domRectFromRect { x: minx
                           , y: miny
                           , width: maxx - minx
                           , height: maxy - miny }
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-- | One-liner `if` simplifying render writing
-- | (best for one child)
if' :: Boolean -> R.Element -> R.Element
if' = if _ then _ else mempty

-- | One-liner `if` simplifying render writing
-- | (best for multiple children)
if_ :: Boolean -> Array (R.Element) -> R.Element
if_ pred arr = if pred then (R.fragment arr) else mempty

-- | Toestand `useLive` automatically sets to "unchanged" behavior
useLive' :: forall box b. T.Read box b => Eq b => box -> R.Hooks b
useLive' = T.useLive T.unequal

-- | Toestand `useBox` + `useLive'` shorthand following same patterns as
-- | React StateHooks API
useBox' :: forall b. Eq b => b -> R.Hooks (Tuple b (T.Box b))
useBox' default = do
  box <- T.useBox default
  b <- useLive' box
  pure $ b /\ box