{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE LambdaCase #-}

import FetchHtml
import PrsVid
import Beaut
import PlayVid
import Search
import Chkcfg
import Video
import Log
import TestExist
import GenStat
import CrtInf
import AskScene

import Control.Applicative
import Control.Concurrent
import Control.Monad
import System.Directory
import System.Exit
import System.Environment
import System.FilePath
import System.IO

import Graphics.Vty
import Graphics.Vty.Widgets.All
import qualified Data.Text as T

main = do
    chkcfg

    c <- newCollection

    lst <- newList 3 
    diskrd <- readVid
    args <- getArgs
    let diskV = if null args then diskrd else dlnVid
    forM_ diskV $ \v -> addToList lst v =<< plainText (beaut v)
    lfg <- newFocusGroup
    addToFocusGroup lfg lst

    statBar <- plainText waitingBar
    setNormalAttribute statBar (black `on` green)

    ui <- centered =<< hFixed 80 =<< vBox lst statBar
    chgls <- addToCollection c ui lfg


    (dlg, dfcg) <- newAskScene
    dui <- centered =<< hFixed 50 (sceneWidget dlg)
    chgdl <- addToCollection c dui dfcg

    dfcg  `onKeyPressed` tryExit

    lfg   `onKeyPressed` tryExit
                                            
    onScePlay dlg $ \_ -> do
        Just (_, (itm, _)) <- getSelected lst
        justPlay itm
    onSceDown dlg $ \_ -> do
        Just (_, (itm, _)) <- getSelected lst
        playVid itm
    onSceQuit dlg $ const exitSuccess
    onSceRemv dlg $ \_ -> do
        Just (_, (itm, _)) <- getSelected lst
        removeVid itm
    ifsfg <- newFocusGroup
    onKeyPressed ifsfg $ \_ key _ -> case key of
        KLeft -> chgls >> return True   
        _     -> return False
    ifsfg `onKeyPressed` tryExit
    onKeyPressed lst $ \_ key _ -> case key of
        KRight -> do
            Just (_, (itm, _)) <- getSelected lst
            inf <- centered =<< plainText (crtInfPg itm)
            addToFocusGroup ifsfg inf
            join $ addToCollection c inf ifsfg
            return True
        _ -> return False

    schedule $ do
        forkIO $ do
            rd    <- prsVid <$> fetchHtml
            vdlst <- search rd <$> getArgs
            when (length vdlst < 1) $ error "empty list!"
            Just (_, (oldItm, _)) <- getSelected lst
            clearList lst
            forM_ vdlst $ \v -> addToList lst v =<< plainText (beaut v)
            listFindFirst lst oldItm >>= \case
                Just ind -> setSelected lst ind
                Nothing  -> return ()

            onSelectionChange lst $ \sle -> case sle of
                SelectionOn _ itm _ -> fex itm >>= \case 
                    True  -> setFocusAttribute lst (black `on` red) 
                    False -> setFocusAttribute lst (black `on` cyan)
                _                   -> return ()

            onSelectionChange lst $ \sle -> case sle of
                SelectionOn _ itm _ -> setText statBar =<< genStat itm
                _ -> return ()
        

            onKeyPressed lst $ \_ key _ -> case key of
                KEnter -> do
                    Just (_, (itm, _)) <- getSelected lst
                    fex itm >>= \case 
                        True  -> chgdl
                        False -> playVid itm
                    return True
                _      -> return False

            (null <$> getArgs) >>= \case
                True -> void . forkIO $ writeVid vdlst
                _    -> return ()
            return ()
        return ()

    runUi c $ defaultContext {normalAttr = white `on` black, 
                              focusAttr  = black `on` blue
                             }
    where fex itm = downloaded $ vidName itm
          tryExit _ key _ = case key of
            KChar 'q' -> exitSuccess
            _         -> return False