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module Gargantext.Components.Table where

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import Prelude
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import Data.Array (filter)
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import Data.Generic.Rep (class Generic)
import Data.Generic.Rep.Show (genericShow)
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import Data.Maybe (Maybe(..))
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import Data.Tuple (fst, snd)
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import Data.Tuple.Nested ((/\))
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import DOM.Simple.Console (log2)
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import Effect (Effect)
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import Reactix as R
import Reactix.DOM.HTML as H
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import Gargantext.Utils.Reactix as R2
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import Gargantext.Utils.Reactix (effectLink)
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type TableContainerProps =
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  ( pageSizeControl     :: R.Element
  , pageSizeDescription :: R.Element
  , paginationLinks     :: R.Element
  , tableHead           :: R.Element
  , tableBody           :: Array R.Element
  )
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type Row = { row :: Array R.Element, delete :: Boolean }
type Rows = Array Row
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type OrderBy = Maybe (OrderByDirection ColumnName)

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type Params = { offset :: Int, limit :: Int, orderBy :: OrderBy }
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newtype ColumnName = ColumnName String

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derive instance genericColumnName :: Generic ColumnName _

instance showColumnName :: Show ColumnName where
  show = genericShow

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derive instance eqColumnName :: Eq ColumnName

columnName :: ColumnName -> String
columnName (ColumnName c) = c

data OrderByDirection a = ASC a | DESC a
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derive instance genericOrderByDirection :: Generic (OrderByDirection a) _

instance showOrderByDirection :: Show a => Show (OrderByDirection a) where
  show = genericShow

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derive instance eqOrderByDirection :: Eq a => Eq (OrderByDirection a)

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type Props =
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  ( colNames     :: Array ColumnName
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  , wrapColElts  :: ColumnName -> Array R.Element -> Array R.Element
                 -- ^ Use `const identity` as a default behavior.
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  , totalRecords :: Int
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  , params       :: R.State Params
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  , rows         :: Rows
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  , container    :: Record TableContainerProps -> R.Element
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  )

type State =
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  { page     :: Int
  , pageSize :: PageSizes
  , orderBy  :: OrderBy
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  }

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stateParams :: State -> Params
stateParams {pageSize, page, orderBy} = {offset, limit, orderBy}
  where
    limit = pageSizes2Int pageSize
    offset = limit * (page - 1)

type TableHeaderLayoutProps =
  ( title :: String
  , desc  :: String
  , query :: String
  , date  :: String
  , user  :: String
  )
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initialParams :: Params
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initialParams = stateParams {page: 1, pageSize: PS10, orderBy: Nothing}
-- TODO: Not sure this is the right place for this

tableHeaderLayout :: Record TableHeaderLayoutProps -> R.Element
tableHeaderLayout props = R.createElement tableHeaderLayoutCpt props []

tableHeaderLayoutCpt :: R.Component TableHeaderLayoutProps
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tableHeaderLayoutCpt = R.staticComponent "G.C.Table.tableHeaderLayout" cpt
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  where
    cpt {title, desc, query, date, user} _ =
      R.fragment
      [ H.div {className: "row"}
        [ H.div {className: "col-md-3"} [ H.h3 {} [H.text title] ]
        , H.div {className: "col-md-9"}
          [ H.hr {style: {height: "2px", backgroundColor: "black"}} ]
        ]
      , H.div {className: "row"}
        [ H.div {className: "jumbotron1", style: {padding: "12px 0px 20px 12px"}}
          [ H.div {className: "col-md-8 content"}
            [ H.p {}
              [ H.i {className: "glyphicon glyphicon-globe"} []
              , H.text $ " " <> desc
          ]
            , H.p {}
              [ H.i {className: "glyphicon glyphicon-zoom-in"} []
              , H.text $ " " <> query
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              ]
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            ]
          , H.div {className: "col-md-4 content"}
            [ H.p {}
              [ H.i {className: "glyphicon glyphicon-calendar"} []
              , H.text $ " " <> date
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              ]
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            , H.p {}
              [ H.i {className: "glyphicon glyphicon-user"} []
              , H.text $ " " <> user
              ]
            ]
          ]
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        ]
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      ]
  
table :: Record Props -> R.Element
table props = R.createElement tableCpt props []
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tableCpt :: R.Component Props
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tableCpt = R.hooksComponent "G.C.Table.table" cpt
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  where
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    cpt {container, colNames, wrapColElts, totalRecords, rows, params} _ = do
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      pageSize@(pageSize' /\ setPageSize) <- R.useState' PS10
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      (page /\ setPage) <- R.useState' 1
      (orderBy /\ setOrderBy) <- R.useState' Nothing
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      let
        state = {pageSize: pageSize', orderBy, page}
        ps = pageSizes2Int pageSize'
        totalPages = (totalRecords / ps) + min 1 (totalRecords `mod` ps)
        colHeader :: ColumnName -> R.Element
        colHeader c = H.th {scope: "col"} [ H.b {} cs ]
          where
            lnk mc = effectLink (setOrderBy (const mc))
            cs :: Array R.Element
            cs =
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              wrapColElts c $
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              case orderBy of
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                Just (ASC d)  | c == d -> [lnk (Just (DESC c)) "DESC ", lnk Nothing (columnName c)]
                Just (DESC d) | c == d -> [lnk (Just (ASC  c)) "ASC ",  lnk Nothing (columnName c)]
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                _ -> [lnk (Just (ASC c)) (columnName c)]
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      R.useEffect1' state $ when (fst params /= stateParams state) $ (snd params) (const $ stateParams state)
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      pure $ container
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        { pageSizeControl: sizeDD pageSize
        , pageSizeDescription: textDescription page pageSize' totalRecords
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        , paginationLinks: pagination setPage totalPages page
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        , tableHead: H.tr {} (colHeader <$> colNames)
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        , tableBody: map (H.tr {} <<< map (\c -> H.td {} [c]) <<< _.row) rows
        }
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defaultContainer :: {title :: String} -> Record TableContainerProps -> R.Element
defaultContainer {title} props = R.fragment
  [ H.div {className: "row"}
    [ H.div {className: "col-md-4"} [ props.pageSizeDescription ]
    , H.div {className: "col-md-4"} [ props.paginationLinks ]
    , H.div {className: "col-md-4"} [ props.pageSizeControl ]
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    ]
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  , H.table {className: "table"}
    [ H.thead {className: "thead-dark"} [ props.tableHead ]
    , H.tbody {} props.tableBody
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    ]
  ]
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-- TODO: this needs to be in Gargantext.Pages.Corpus.Graph.Tabs
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graphContainer :: {title :: String} -> Record TableContainerProps -> R.Element
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graphContainer {title} props =
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  -- TODO title in tabs name (above)
  H.table {className: "table"}
  [ H.thead {className: "thead-dark"} [ props.tableHead ]
  , H.tbody {} props.tableBody
  ]
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   -- TODO better rendering of the paginationLinks
   -- , props.pageSizeControl
   -- , props.pageSizeDescription
   -- , props.paginationLinks
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sizeDD :: R.State PageSizes -> R.Element
sizeDD (ps /\ setPageSize) =
  H.span {} [ R2.select { className, defaultValue: ps, on: {change} } sizes ]
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  where
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    className = "form-control"
    change e = setPageSize $ const (string2PageSize $ R2.unsafeEventValue e)
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    sizes = map option pageSizes
    option size = H.option {value} [H.text value]
      where value = show size
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textDescription :: Int -> PageSizes -> Int -> R.Element
textDescription currPage pageSize totalRecords =
  H.div {className: "row1"} [ H.div {className: ""} [ H.text msg ] ] -- TODO or col-md-6 ?
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  where
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    start = (currPage - 1) * pageSizes2Int pageSize + 1
    end' = currPage * pageSizes2Int pageSize
    end  = if end' > totalRecords then totalRecords else end'
    msg = "Showing " <> show start <> " to " <> show end <> " of " <> show totalRecords

pagination :: (R2.Setter Int) -> Int -> Int -> R.Element
pagination changePage tp cp =
  H.span {} $
    [ H.text " ", prev, first, ldots]
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    <>
    lnums
    <>
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    [H.b {} [H.text $ " " <> show cp <> " "]]
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    <>
    rnums
    <>
    [ rdots, last, next ]
    where
      prev = if cp == 1 then
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               H.text " Prev. "
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             else
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               changePageLink (cp - 1) "Prev."
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      next = if cp == tp then
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               H.text " Next "
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             else
               changePageLink (cp + 1) "Next"
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      first = if cp == 1 then
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                H.text ""
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              else
                changePageLink' 1
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      last = if cp == tp then
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               H.text ""
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             else
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               changePageLink' tp
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      ldots = if cp >= 5 then
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                H.text " ... "
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                else
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                H.text ""
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      rdots = if cp + 3 < tp then
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                H.text " ... "
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                else
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                H.text ""
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      lnums = map changePageLink' $ filter (1  < _) [cp - 2, cp - 1]
      rnums = map changePageLink' $ filter (tp > _) [cp + 1, cp + 2]
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      changePageLink :: Int -> String -> R.Element
      changePageLink i s =
        H.span {}
          [ H.text " "
          , effectLink (changePage (const i)) s
          , H.text " "
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          ]

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      changePageLink' :: Int -> R.Element
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      changePageLink' i = changePageLink i (show i)
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data PageSizes = PS10 | PS20 | PS50 | PS100 | PS200
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derive instance eqPageSizes :: Eq PageSizes

instance showPageSize :: Show PageSizes where
  show PS10  = "10"
  show PS20  = "20"
  show PS50  = "50"
  show PS100 = "100"
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  show PS200 = "200"
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pageSizes2Int :: PageSizes -> Int
pageSizes2Int PS10  = 10
pageSizes2Int PS20  = 20
pageSizes2Int PS50  = 50
pageSizes2Int PS100 = 100
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pageSizes2Int PS200 = 200
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pageSizes :: Array PageSizes
pageSizes = [PS10, PS20, PS50, PS100, PS200]
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string2PageSize :: String -> PageSizes
string2PageSize "10" = PS10
string2PageSize "20" = PS20
string2PageSize "50" = PS50
string2PageSize "100" = PS100
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string2PageSize "200" = PS200
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string2PageSize _    = PS10