module Component.Add where

import Prelude hiding (div)

import Affjax (printError)
import Affjax.StatusCode (StatusCode(..))
import App (destroy, editBookmark, lookupTitle)
import Data.Either (Either(..))
import Data.Lens (Lens', lens, use, (%=), (.=))
import Data.Maybe (Maybe(..), fromMaybe, isJust, maybe)
import Data.Monoid (guard)
import Data.String (Pattern(..), null, stripPrefix)
import Data.Tuple (fst, snd)
import Effect.Aff (Aff)
import Effect.Class (liftEffect)
import Effect.Console (log)
import Globals (closeWindow, mmoment8601)
import Halogen as H
import Halogen.HTML (button, div, form, input, label, p, span, table, tbody_, td, td_, text, textarea, tr_)
import Halogen.HTML.Events (onSubmit, onValueChange, onChecked, onClick)
import Halogen.HTML.Properties (ButtonType(..), InputType(..), autocomplete, autofocus, checked, disabled, for, id, name, required, rows, title, type_, value)
import Model (Bookmark)
import Util (_curQuerystring, _loc, _doc, _lookupQueryStringValue, attr, class_, ifElseH, whenH)
import Web.Event.Event (Event, preventDefault)
import Web.HTML (window)
import Web.HTML.HTMLDocument (referrer)
import Web.HTML.Location (setHref, origin)

data BAction
  = BEditField EditField
  | BEditSubmit Event
  | BDeleteAsk Boolean
  | BLookupTitle
  | BDestroy

data EditField
  = Eurl String
  | Etitle String
  | Edescription String
  | Etags String
  | Eprivate Boolean
  | Etoread Boolean

type BState =
  { bm :: Bookmark
  , edit_bm :: Bookmark
  , deleteAsk :: Boolean
  , loading :: Boolean
  , destroyed :: Boolean
  , apiError :: Maybe String
  }

_bm :: Lens' BState Bookmark
_bm = lens _.bm (_ { bm = _ })

_edit_bm :: Lens' BState Bookmark
_edit_bm = lens _.edit_bm (_ { edit_bm = _ })

_apiError :: Lens' BState (Maybe String)
_apiError = lens _.apiError (_ { apiError = _ })

addbmark :: forall q i o. Bookmark -> H.Component q i o Aff
addbmark b' =
  H.mkComponent
    { initialState: const (mkState b')
    , render
    , eval: H.mkEval $ H.defaultEval { handleAction = handleAction }
    }
  where

  mkState b =
    { bm: b
    , edit_bm: b
    , deleteAsk: false
    , destroyed: false
    , loading: false
    , apiError: Nothing
    }

  render :: forall m. BState -> H.ComponentHTML BAction () m
  render s@{ bm, edit_bm, apiError } =
    ifElseH (not s.destroyed)
      display_edit
      display_destroyed
   where
     display_edit _ =
       form [ onSubmit BEditSubmit ]
       [ table [ class_ "w-100" ]
         [ tbody_
           [ tr_
             [ td [ class_ "w1" ] [ ]
             , td_ [ whenH (bm.bid > 0)
                       display_exists,
                     whenH (isJust apiError)
                       (alert_notification (fromMaybe "" apiError))
                   ]
             ]
           , tr_
             [ td_ [ label [ for "url" ] [ text "URL" ] ]
             , td_ [ input [ type_ InputUrl , id "url", class_ "w-100 mv1" , required true, name "url", autofocus (null bm.url)
                          , value (edit_bm.url) , onValueChange (editField Eurl)] ]
             ]
           , tr_
             [ td_ [ label [ for "title" ] [ text "title" ] ]
             , td [class_ "flex"]
                  [ input [ type_ InputText , id "title", class_ "w-100 mv1 flex-auto" , name "title" , value (edit_bm.title) , onValueChange (editField Etitle)]
                  , button [ disabled s.loading, type_ ButtonButton, onClick \_ -> BLookupTitle, class_ ("ml2 input-reset ba b--navy pointer f6 di dim pa1 ma1 mr0 " <> guard s.loading "bg-light-silver") ] [ text "fetch" ]
                  ]
             ]
           , tr_
             [ td_ [ label [ for "description" ] [ text "description" ] ]
             , td_ [ textarea [ class_ "w-100 mt1 mid-gray" , id "description", name "description", rows 4
                              , value (edit_bm.description) , onValueChange (editField Edescription)] ]
             ]
           , tr_
             [ td_ [ label [ for "tags" ] [ text "tags" ] ]
             , td_ [ input [ type_ InputText , id "tags", class_ "w-100 mv1" , name "tags", autocomplete false, attr "autocapitalize" "off", autofocus (not $ null bm.url)
                           , value (edit_bm.tags) , onValueChange (editField Etags)] ]
             ]
           , tr_
             [ td_ [ label [ for "private" ] [ text "private" ] ]
             , td_ [ input [ type_ InputCheckbox , id "private", class_ "private pointer" , name "private"
                           , checked (edit_bm.private) , onChecked (editField Eprivate)] ]
             ]
           , tr_
             [ td_ [ label [ for "toread" ] [ text "read later" ] ]
             , td_ [ input [ type_ InputCheckbox , id "toread", class_ "toread pointer" , name "toread"
                           , checked (edit_bm.toread) , onChecked (editField Etoread)] ]
             ]
           , tr_
             [ td_ [ ]
             , td_ [ input [ type_ InputSubmit , class_ "ph3 pv2 input-reset ba b--navy bg-transparent pointer f6 dib mt1 dim"
                           , value (if bm.bid > 0 then "update bookmark" else "add bookmark") ] ]
             ]
           ]
         ]
       ]

     display_exists _ = 
       div [ class_ "alert" ]
       [ text "previously saved "
       , span [ class_ "link f7 dib gray pr3" , title (maybe bm.time snd mmoment) ]
         [ text (maybe " " fst mmoment) ]
       , div [ class_ "edit_links dib ml1" ]
         [ div [ class_ "delete_link di" ]
           [ button ([ type_ ButtonButton, onClick \_ -> BDeleteAsk true, class_ "delete" ] <> guard s.deleteAsk [ attr "hidden" "hidden" ]) [ text "delete" ]
           , span ([ class_ "confirm red" ] <> guard (not s.deleteAsk) [ attr "hidden" "hidden" ])
             [ button [ type_ ButtonButton, onClick \_ -> BDeleteAsk false] [ text "cancel / " ]
             , button [ type_ ButtonButton, onClick \_ -> BDestroy, class_ "red" ] [ text "destroy" ]
             ] 
           ]
         ]
       ]

     alert_notification alert_text _ = 
       div [ class_ "alert alert-err" ] [ text alert_text ]

     display_destroyed _ = p [ class_ "red"] [text "you killed this bookmark"]

     editField :: forall a. (a -> EditField) -> a -> BAction
     editField f = BEditField <<< f
     mmoment = mmoment8601 bm.time
     -- toTextarea =
     --   drop 1
     --     <<< foldMap (\x -> [br_, text x])
     --     <<< S.split (Pattern "\n")

  handleAction :: BAction -> H.HalogenM BState BAction () o Aff Unit
  handleAction (BDeleteAsk e) = do
    H.modify_ (_ { deleteAsk = e })

  handleAction BLookupTitle = do
    H.modify_ (_ { loading = true })
    edit_bm <- H.gets _.edit_bm
    mtitle <- H.liftAff $ lookupTitle edit_bm
    case mtitle of
      Just title' -> _edit_bm %= (_ { title = title' })
      Nothing -> pure $ unit
    H.modify_ (_ { loading = false })

  handleAction (BDestroy) = do
    bid <- H.gets _.bm.bid
    void $ H.liftAff (destroy bid)
    H.modify_ (_ { destroyed = true })

  handleAction (BEditField f) = do
    _edit_bm %= case f of
      Eurl e -> _ { url = e }
      Etitle e -> _ { title = e }
      Edescription e -> _ { description = e }
      Etags e -> _ { tags = e }
      Eprivate e -> _ { private = e }
      Etoread e -> _ { toread = e }

  handleAction (BEditSubmit e) = do
    liftEffect (preventDefault e)
    edit_bm <- use _edit_bm 
    _apiError .= Nothing
    H.liftAff (editBookmark edit_bm) >>= case _ of
      Left affErr -> do
        _apiError .= Just (printError affErr)
        liftEffect $ log (printError affErr)
      Right { status: StatusCode s } | s >= 200 && s < 300 -> do
        _bm .= edit_bm
        qs <- liftEffect $ _curQuerystring
        doc <- liftEffect $ _doc
        ref <- liftEffect $ referrer doc
        loc <- liftEffect $ _loc
        org <- liftEffect $ origin loc
        case _lookupQueryStringValue qs "next" of
          Just "closeWindow" -> liftEffect $ closeWindow =<< window
          Just "back" -> liftEffect $
            case stripPrefix (Pattern org) ref of
              Just _ -> setHref ref loc
              Nothing -> setHref org loc
          _ -> liftEffect $ closeWindow =<< window
      Right res -> do
        _apiError .= Just (res.body)
        liftEffect $ log (res.body)