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module Gargantext.Components.Corpus.CodeSection where

import Gargantext.Prelude

import Data.Array as A
import Data.Either (Either(..))
import Data.Eq.Generic (genericEq)
import Data.FunctorWithIndex (mapWithIndex)
import Data.Generic.Rep (class Generic)
import Data.List (intercalate)
import Data.List as List
import Data.Maybe (Maybe(..), fromMaybe)
import Data.Show.Generic (genericShow)
import Effect (Effect)
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import Effect.Aff (Aff, throwError)
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import Effect.Exception (error)
import Gargantext.Components.Bootstrap as B
import Gargantext.Components.Bootstrap.Types (ComponentStatus(..), Variant(..))
import Gargantext.Components.CodeEditor as CE
import Gargantext.Components.InputWithEnter (inputWithEnter)
import Gargantext.Components.Node (HyperdataList, NodePoly(..))
import Gargantext.Components.Nodes.Corpus.Types (CorpusData, Hyperdata)
import Gargantext.Components.Nodes.Types (FTField, FTFieldWithIndex, FTFieldsWithIndex(..), Field(..), FieldType(..), Hash, Index, defaultHaskell', defaultJSON', defaultMarkdown', defaultPython')
import Gargantext.Config.REST (AffRESTError, RESTError(..))
import Gargantext.Data.Array as GDA
import Gargantext.Routes (SessionRoute(Children, NodeAPI))
import Gargantext.Sessions (Session, get, put)
import Gargantext.Types (AffETableResult, NodeType(..), ID)
import Gargantext.Utils ((?))
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-- import Gargantext.Utils.Crypto as Crypto
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import Gargantext.Utils.Reactix as R2
import Gargantext.Utils.Toestand as T2
import Reactix as R
import Reactix.DOM.HTML as H
import Simple.JSON as JSON
import Toestand as T

here :: R2.Here
here = R2.here "Gargantext.Components.Corpus.CodeSection"

type FieldsCodeEditorProps =
  (
    fields :: T.Box FTFieldsWithIndex
    | LoadProps
  )

fieldsCodeEditor :: R2.Component FieldsCodeEditorProps
fieldsCodeEditor = R.createElement fieldsCodeEditorCpt
fieldsCodeEditorCpt :: R.Component FieldsCodeEditorProps
fieldsCodeEditorCpt = here.component "fieldsCodeEditorCpt" cpt
  where
    cpt { fields, nodeId } _ = do
      (FTFieldsWithIndex fields') <- T.useLive T.unequal fields
      masterKey <- T.useBox T2.newReload
      masterKey' <- T.useLive T.unequal masterKey

      let
        editorsMap { idx, ftField } =
          fieldCodeEditorWrapper
          { canMoveDown: idx < (List.length fields' - 1)
          , canMoveUp: idx > 0
          , field: ftField
          , key: (show masterKey') <> "-" <> (show idx)
          , onChange: onChange idx
          , onMoveDown: onMoveDown masterKey idx
          , onMoveUp: onMoveUp masterKey idx
          , onRemove: onRemove idx
          , onRename: onRename idx
          , idx
          , nodeId
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          , initiallyOpened: idx == 0
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          }

      pure $

        H.div
        { className: intercalate " "
            [ "accordion"
            ]
        }
        $ List.toUnfoldable (editorsMap <$> fields')

      where
        onChange :: Index -> FieldType -> Effect Unit
        onChange idx typ = do
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          T.modify_ (
            (\(FTFieldsWithIndex fs) ->
              FTFieldsWithIndex $ fromMaybe fs $
                List.modifyAt idx (\{ ftField: Field f} -> { idx, ftField: Field $ f { typ = typ } }) fs))
            fields
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        onMoveDown :: T2.ReloadS -> Index -> Unit -> Effect Unit
        onMoveDown masterKey idx _ = do
          T2.reload masterKey
          T.modify_ (\(FTFieldsWithIndex fs) -> recomputeIndices $ FTFieldsWithIndex $ GDA.swapList idx (idx + 1) fs) fields

        onMoveUp :: T2.ReloadS -> Index -> Unit -> Effect Unit
        onMoveUp masterKey idx _ = do
          T2.reload masterKey
          T.modify_ (\(FTFieldsWithIndex fs) -> recomputeIndices $ FTFieldsWithIndex $ GDA.swapList idx (idx - 1) fs) fields

        onRemove :: Index -> Unit -> Effect Unit
        onRemove idx _ = do
          T.modify_ (\(FTFieldsWithIndex fs) -> FTFieldsWithIndex $ fromMaybe fs $ List.deleteAt idx fs) fields

        onRename :: Index -> String -> Effect Unit
        onRename idx newName = do
          T.modify_ (\(FTFieldsWithIndex fs) ->
            FTFieldsWithIndex $ fromMaybe fs $
              List.modifyAt idx (\{ ftField: Field f } -> { idx, ftField: Field $ f { name = newName } }) fs) fields

    recomputeIndices :: FTFieldsWithIndex -> FTFieldsWithIndex
    recomputeIndices (FTFieldsWithIndex lst) = FTFieldsWithIndex $ mapWithIndex (\idx -> \{ ftField } -> { idx, ftField }) lst

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-- hash :: FTFieldWithIndex -> Aff Hash
-- hash { idx, ftField } = Crypto.hash $ "--idx--" <> (show idx) <> "--field--" <> (show ftField)
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type FieldCodeEditorProps =
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  ( idx             :: Int
  , nodeId          :: ID
  , canMoveDown     :: Boolean
  , canMoveUp       :: Boolean
  , field           :: FTField
  , key             :: String
  , onChange        :: FieldType -> Effect Unit
  , onMoveDown      :: Unit -> Effect Unit
  , onMoveUp        :: Unit -> Effect Unit
  , onRemove        :: Unit -> Effect Unit
  , onRename        :: String -> Effect Unit
  , initiallyOpened :: Boolean
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  )

fieldCodeEditorWrapper :: Record FieldCodeEditorProps -> R.Element
fieldCodeEditorWrapper props = R.createElement fieldCodeEditorWrapperCpt props []
fieldCodeEditorWrapperCpt :: R.Component FieldCodeEditorProps
fieldCodeEditorWrapperCpt = here.component "fieldCodeEditorWrapperCpt" cpt where
  cpt props@{ canMoveDown
            , canMoveUp
            , field: Field { name }
            , onMoveDown
            , onMoveUp
            , onRemove
            , onRename
            , idx
            , nodeId
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            , initiallyOpened
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            } _ = do
    -- | Computed
    -- |
    let
      headerId = "collapse-header--" <> (show nodeId) <> "--" <> (show idx)
      bodyId = "collapse-body--" <> (show nodeId) <> "--" <> (show idx)

    -- | Render
    -- |
    pure $

      H.div
      { className: intercalate " "
          [ "card"
          , "code-section-item"
          ]
      }
      [
        H.div
        { className: intercalate " "
            [ "card-header"
            , "d-flex", "align-items-center", "justify-content-space-between"
            ]
        , id: headerId
        }
        [
          B.wad
          [ "d-flex", "gap-2", "align-items-center" ]
          [
            H.div
            { data:
                { toggle: "collapse"
                , target: "#" <> bodyId
                }
            }
            [
              B.iconButton
              { status: Muted
              , name: "caret-down"
              , callback: const $ pure unit
              , className: "font-size-120"
              }
            ]
          ,
            inputWithEnter
            { onBlur: onRename
            , onEnter: \_ -> pure unit
            , onValueChanged: onRename
            , autoFocus: false
            , className: "form-control"
            , defaultValue: name
            , placeholder: "Enter file name"
            , type: "text"
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            , required: false
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            }
          ]
        ,
          B.wad
          [ "d-flex", "gap-2", "align-items-center" ]
          [
            B.iconButton
            { variant: Secondary
            , callback: const $ onRemove unit
            , name: "trash-o"
            , focusRing: false
            }
          ,
            B.iconButton
            { callback: const $ onMoveUp unit
            , name: "arrow-up"
            , variant: Secondary
            , status: canMoveUp ?
                Enabled $
                Disabled
            }
          ,
            B.iconButton
            { callback: const $ onMoveDown unit
            , name: "arrow-down"
            , variant: Secondary
            , status: canMoveDown ?
                Enabled $
                Disabled
            }
          ]
        ]
      ,
        H.div
        { id: bodyId
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        , className: intercalate " "
            [ "collapse card-body"
            , initiallyOpened ? "show" $ ""
            ]
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        , aria:
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            { labelledby: headerId
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            }
        }
        [
          fieldCodeEditor props
        ]
      ]


type RenameableProps =
  (
    onRename :: String -> Effect Unit
  , text :: String
  )

renameable :: Record RenameableProps -> R.Element
renameable props = R.createElement renameableCpt props []
renameableCpt :: R.Component RenameableProps
renameableCpt = here.component "renameableCpt" cpt
  where
    cpt {onRename, text} _ = do
      isEditing <- T.useBox false
      state <- T.useBox text
      textRef <- R.useRef text

      -- handle props change of text
      R.useEffect1' text $ do
        if R.readRef textRef == text then
          pure unit
        else do
          R.setRef textRef text
          T.write_ text state

      pure $ H.div { className: "renameable" } [
        renameableText { isEditing, onRename, state }
      ]

type RenameableTextProps =
  (
    isEditing :: T.Box Boolean
  , onRename  :: String -> Effect Unit
  , state     :: T.Box String
  )

renameableText :: Record RenameableTextProps -> R.Element
renameableText props = R.createElement renameableTextCpt props []
renameableTextCpt :: R.Component RenameableTextProps
renameableTextCpt = here.component "renameableTextCpt" cpt
  where
    cpt { isEditing, onRename, state } _ = do
      isEditing' <- T.useLive T.unequal isEditing
      state' <- T.useLive T.unequal state

      pure $ if isEditing' then
              H.div { className: "input-group" }
                [ inputWithEnter {
                    autoFocus: false
                  , className: "form-control text"
                  , defaultValue: state'
                  , onBlur: \st -> T.write_ st state
                  , onEnter: submit state'
                  , onValueChanged: \st -> T.write_ st state
                  , placeholder: ""
                  , type: "text"
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                  , required: false
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                  }
                , H.div { className: "btn input-group-append"
                        , on: { click: submit state' } }
                  [ H.span { className: "fa fa-floppy-o" } []
                  ]
                ]
             else
               H.div { className: "input-group" }
               [ H.input { className: "form-control"
                         , defaultValue: state'
                         , disabled: 1
                         , type: "text" }
               , H.div { className: "btn input-group-append"
                       , on: { click: \_ -> T.write_ true isEditing } }
                 [ H.span { className: "fa fa-pencil" } []
                 ]
               ]
      where
        submit text _ = do
          T.write_ false isEditing
          onRename text

fieldCodeEditor :: Record FieldCodeEditorProps -> R.Element
fieldCodeEditor props = R.createElement fieldCodeEditorCpt props []
fieldCodeEditorCpt :: R.Component FieldCodeEditorProps
fieldCodeEditorCpt = here.component "fieldCodeEditorCpt" cpt
  where
    cpt {field: Field {typ: typ@(Haskell {haskell})}, onChange} _ = do
      pure $ CE.codeEditor {code: haskell, defaultCodeType: CE.Haskell, onChange: changeCode onChange typ}

    cpt {field: Field {typ: typ@(Python {python})}, onChange} _ = do
      pure $ CE.codeEditor {code: python, defaultCodeType: CE.Python, onChange: changeCode onChange typ}

    cpt {field: Field {typ: typ@(JSON j)}, onChange} _ = do
      pure $ CE.codeEditor {code, defaultCodeType: CE.JSON, onChange: changeCode onChange typ}
      where
        code = R2.stringify (JSON.writeImpl j) 2

    cpt {field: Field {typ: typ@(Markdown {text})}, onChange} _ = do
      pure $ CE.codeEditor {code: text, defaultCodeType: CE.Markdown, onChange: changeCode onChange typ}

-- Performs the matrix of code type changes
-- (FieldType -> Effect Unit) is the callback function for fields array
-- FieldType is the current element that we will modify
-- CE.CodeType is the editor code type (might have been the cause of the trigger)
-- CE.Code is the editor code (might have been the cause of the trigger)
changeCode :: (FieldType -> Effect Unit) -> FieldType -> CE.CodeType -> CE.Code -> Effect Unit
changeCode onc (Haskell hs)        CE.Haskell  c = onc $ Haskell $ hs { haskell = c }
changeCode onc (Haskell _)         CE.Python   c = onc $ Python   $ defaultPython'   { python  = c }
changeCode onc (Haskell {haskell}) CE.JSON     _ = onc $ JSON     $ defaultJSON'     { desc = haskell }
changeCode onc (Haskell {haskell}) CE.Markdown _ = onc $ Markdown $ defaultMarkdown' { text = haskell }

changeCode onc (Python hs)       CE.Python   c = onc $ Python  $ hs { python  = c }
changeCode onc (Python _)        CE.Haskell  c = onc $ Haskell $ defaultHaskell' { haskell = c }
changeCode onc (Python {python}) CE.JSON     _ = onc $ JSON     $ defaultJSON' { desc = python }
changeCode onc (Python {python}) CE.Markdown _ = onc $ Markdown $ defaultMarkdown' { text = python }

changeCode onc (Markdown _)  CE.Haskell  c = onc $ Haskell  $ defaultHaskell'  { haskell = c }
changeCode onc (Markdown _)  CE.Python   c = onc $ Python   $ defaultPython'   { python  = c }
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changeCode onc (Markdown _)  CE.JSON     c = onc $ JSON     $ defaultJSON'     { desc    = c }
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changeCode onc (Markdown md) CE.Markdown c = onc $ Markdown $ md               { text    = c }

changeCode onc (JSON j) CE.Haskell _ = onc $ Haskell $ defaultHaskell' { haskell = haskell }
  where
    haskell = R2.stringify (JSON.writeImpl j) 2
changeCode onc (JSON j) CE.Python _ = onc $ Python $ defaultPython' { python = toCode }
  where
    toCode = R2.stringify (JSON.writeImpl j) 2
changeCode onc _ CE.JSON c = do
  case JSON.readJSON c of
    Left _ -> here.warn2 "[fieldCodeEditor'] cannot parse json" c  -- TODO Refactor?
    Right j' -> onc $ JSON j'
  -- case jsonParser c of
  --   Left err -> here.warn2 "[fieldCodeEditor'] cannot parse json" c
  --   Right j' -> case decodeJson j' of
  --     Left err -> here.warn2 "[fieldCodeEditor'] cannot decode json" j'
  --     Right j'' -> onc $ JSON j''
changeCode onc (JSON j) CE.Markdown _ = onc $ Markdown $ defaultMarkdown' { text = text }
  where
    text = R2.stringify (JSON.writeImpl j) 2


type LoadProps =
  ( nodeId  :: ID
  , session :: Session
  )

loadCorpus' :: Record LoadProps -> AffRESTError (NodePoly Hyperdata)
loadCorpus' {nodeId, session} = get session $ NodeAPI Corpus (Just nodeId) ""

-- Just to make reloading effective
loadCorpusWithReload :: { reload :: T2.Reload  | LoadProps } -> AffRESTError (NodePoly Hyperdata)
loadCorpusWithReload {nodeId, session} = loadCorpus' {nodeId, session}

type SaveProps = (
  hyperdata :: Hyperdata
  | LoadProps
  )

saveCorpus :: Record SaveProps -> AffRESTError Int
saveCorpus {hyperdata, nodeId, session} = do
  put session (NodeAPI Corpus (Just nodeId) "") hyperdata

loadCorpus :: Record LoadProps -> AffRESTError CorpusData
loadCorpus {nodeId, session} = do
  -- fetch corpus via lists parentId
  res <- get session nodePolyRoute
  case res of
    Left err -> pure $ Left err
    Right (NodePoly {parentId: corpusId} :: NodePoly {}) -> do
      eCorpusNode     <-  get session $ corpusNodeRoute     (fromMaybe 0 corpusId) ""
      eDefaultListIds <- (get session $ defaultListIdsRoute (fromMaybe 0 corpusId))
                      :: forall a. JSON.ReadForeign a => AffETableResult (NodePoly a)
      case eCorpusNode of
        Left err -> pure $ Left err
        Right corpusNode -> do
          case eDefaultListIds of
            Left err -> pure $ Left err
            Right defaultListIds -> do
              case (A.head defaultListIds.docs :: Maybe (NodePoly HyperdataList)) of
                Just (NodePoly { id: defaultListId }) ->
                  pure $ Right { corpusId: (fromMaybe 0 corpusId), corpusNode, defaultListId }
                Nothing ->
                  pure $ Left $ CustomError "Missing default list"

--  (NodePoly {parentId: corpusId} :: NodePoly {}) <- get session nodePolyRoute
--  corpusNode     <-  get session $ corpusNodeRoute     corpusId ""
--  defaultListIds <- (get session $ defaultListIdsRoute corpusId)
--                    :: forall a. JSON.ReadForeign a => AffTableResult (NodePoly a)
--  case (A.head defaultListIds.docs :: Maybe (NodePoly HyperdataList)) of
--    Just (NodePoly { id: defaultListId }) ->
--      pure {corpusId, corpusNode, defaultListId}
--    Nothing ->
--      throwError $ error "Missing default list"
  where
    nodePolyRoute       = NodeAPI Corpus (Just nodeId) ""
    corpusNodeRoute     = NodeAPI Corpus <<< Just
    defaultListIdsRoute = Children NodeList 0 1 Nothing <<< Just


loadCorpusWithChild :: Record LoadProps -> AffRESTError CorpusData
loadCorpusWithChild { nodeId: childId, session } = do
  -- fetch corpus via lists parentId
  eListNode <- get session $ listNodeRoute childId ""
  case eListNode of
    Left err -> pure $ Left err
    Right listNode -> do
      let (NodePoly {parentId: corpusId} :: NodePoly {}) = listNode
      eCorpusNode     <-  get session $ corpusNodeRoute     (fromMaybe 0 corpusId) ""
      case eCorpusNode of
        Left err -> pure $ Left err
        Right corpusNode -> do
          eDefaultListIds <- (get session $ defaultListIdsRoute (fromMaybe 0 corpusId))
                             :: forall a. JSON.ReadForeign a => AffETableResult (NodePoly a)
          case eDefaultListIds of
            Left err -> pure $ Left err
            Right defaultListIds -> do
              case (A.head defaultListIds.docs :: Maybe (NodePoly HyperdataList)) of
                Just (NodePoly { id: defaultListId }) ->
                  pure $ Right { corpusId: fromMaybe 0 corpusId, corpusNode, defaultListId }
                Nothing ->
                  throwError $ error "Missing default list"
  where
    corpusNodeRoute     = NodeAPI Corpus <<< Just
    listNodeRoute       = NodeAPI Node <<< Just
    defaultListIdsRoute = Children NodeList 0 1 Nothing <<< Just


type LoadWithReloadProps =
  (
    reload :: T2.Reload
  | LoadProps
  )


-- Just to make reloading effective
loadCorpusWithChildAndReload :: Record LoadWithReloadProps -> AffRESTError CorpusData
loadCorpusWithChildAndReload {nodeId, session} = loadCorpusWithChild {nodeId, session}

data ViewType = Code | Folders
derive instance Generic ViewType _
instance Eq ViewType where
  eq = genericEq
instance Show ViewType where
  show = genericShow

type ViewTypeSelectorProps =
  (
    state :: T.Box ViewType
  )

viewTypeSelector :: Record ViewTypeSelectorProps -> R.Element
viewTypeSelector p = R.createElement viewTypeSelectorCpt p []
viewTypeSelectorCpt :: R.Component ViewTypeSelectorProps
viewTypeSelectorCpt = here.component "viewTypeSelector" cpt
  where
    cpt {state} _ = do
      state' <- T.useLive T.unequal state

      pure $ H.div { className: "btn-group"
                   , role: "group" } [
          viewTypeButton Folders state' state
        , viewTypeButton Code state' state
        ]

    viewTypeButton viewType state' state =
      H.button { className: "btn btn-primary" <> active
               , on: { click: \_ -> T.write viewType state }
               , type: "button"
               } [
        H.i { className: "fa " <> (icon viewType) } []
      ]
      where
        active = if viewType == state' then " active" else ""

    icon Folders = "fa-folder"
    icon Code = "fa-code"