{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}

module MusicScroll.UIContext where

import Control.Monad (forever, unless)
import Data.GI.Gtk.Threading (postGUISync)
import Data.Maybe (isNothing)
import Data.Text as T
import qualified GI.Gtk as Gtk
import MusicScroll.LyricsPipeline
import MusicScroll.Providers.Utils (Lyrics (..))
import MusicScroll.TrackInfo (TrackByPath (..), TrackInfo (..))
import Pipes

data UIContext = UIContext
  { mainWindow :: Gtk.Window,
    titleLabel :: Gtk.Label,
    artistLabel :: Gtk.Label,
    lyricsTextView :: Gtk.TextView,
    errorLabel :: Gtk.Label,
    titleSuplementEntry :: Gtk.Entry,
    artistSuplementEntry :: Gtk.Entry,
    suplementAcceptButton :: Gtk.Button,
    suplementUpdateButton :: Gtk.Button,
    keepArtistNameCheck :: Gtk.CheckButton
  }

errorMsg :: ErrorCause -> Text
errorMsg (NotOnDB trackPath)
  | isNothing (tpArtist trackPath) =
    "No lyrics found by hash on the song file, try to suplement the song's\
    \ artist metadata to try to get it from the web."
  | isNothing (tpTitle trackPath) =
    "No lyrics found by hash on the song file, try to suplement the song's\
    \ title metadata to try to get it from the web."
  | otherwise = "This case should not happen"
errorMsg ENoSong = "No song found, this is usually an intermediary state."
errorMsg (NoLyricsOnWeb _) = "Lyrics provider didn't have that song."

extractGuess :: ErrorCause -> Maybe (Text, Text)
extractGuess (NoLyricsOnWeb (TrackInfo {..})) = pure (tTitle, tArtist)
extractGuess (NotOnDB (TrackByPath {..})) =
  let def = maybe mempty id in pure (def tpTitle, def tpArtist)
extractGuess _ = Nothing

-- | Only usable inside a gtk context
updateNewLyrics :: UIContext -> (TrackInfo, Lyrics) -> IO ()
updateNewLyrics ctx@(UIContext {..}) (track, Lyrics singleLyrics) =
  let !bytesToUpdate = fromIntegral $ T.length singleLyrics
   in postGUISync $ do
        Gtk.labelSetText errorLabel mempty
        Gtk.labelSetText titleLabel (tTitle track)
        Gtk.labelSetText artistLabel (tArtist track)
        lyricsBuffer <- Gtk.textViewGetBuffer lyricsTextView
        Gtk.textBufferSetText lyricsBuffer singleLyrics bytesToUpdate
        updateSuplementalGuess ctx (mempty, mempty)

dischargeOnUI :: UIContext -> Consumer SearchResult IO a
dischargeOnUI ctx = forever (dischargeOnUISingle ctx)

dischargeOnUISingle :: UIContext -> Consumer SearchResult IO ()
dischargeOnUISingle ctx = do
  res <- await
  liftIO $ case res of
    GotLyric _ info lyr -> updateNewLyrics ctx (info, lyr)
    ErrorOn cause -> updateErrorCause ctx cause

updateErrorCause :: UIContext -> ErrorCause -> IO ()
updateErrorCause ctx@(UIContext {..}) cause = postGUISync $
  do
    Gtk.labelSetText titleLabel "No Song available"
    Gtk.labelSetText artistLabel mempty
    lyricsBuffer <- Gtk.textViewGetBuffer lyricsTextView
    Gtk.textBufferSetText lyricsBuffer mempty 0
    Gtk.labelSetText errorLabel (errorMsg cause)
    maybe (return ()) (updateSuplementalGuess ctx) (extractGuess cause)

updateSuplementalGuess :: UIContext -> (Text, Text) -> IO ()
updateSuplementalGuess (UIContext {..}) (guessTitle, guessArtist) =
  do
    Gtk.entrySetText titleSuplementEntry guessTitle
    shouldMaintainArtistSupl <- Gtk.getToggleButtonActive keepArtistNameCheck
    unless shouldMaintainArtistSupl $
      Gtk.entrySetText artistSuplementEntry guessArtist