{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE LambdaCase #-}
{-# OPTIONS_GHC -fno-warn-unused-do-bind #-}

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.Exit
import System.Environment

import Graphics.Vty
import Graphics.Vty.Widgets.All

main :: IO ()
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
    if null args || head args /= "-f" 
    then schedule $ do
        forkIO $ do
            rd <- prsVid <$> fetchHtml
            let vdlst = search rd args
            when (length vdlst < 1) $ error "no video found!"
            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 ()

            vLstAction lst chgdl statBar

            (null <$> getArgs) >>= \case                
                True -> void . forkIO $ writeVid vdlst
                _    -> return ()
            return ()
        return ()
    else schedule $ do
        forkIO $ do
            rd <- prsFld <$> fetchHtml
            let fdlst = search rd (tail args)
            when (length fdlst < 1) $ error "no folder found!"
            clearList lst
            forM_ fdlst $ \v -> addToList lst v =<< plainText (beaut v)
            setFocusAttribute lst (black `on` cyan)
            return ()
        return ()

    let openFld lnk = do
            ctnt <- (map (attcLink lnk) . prsVid) <$> fetchFld lnk 
            when (null ctnt) $ error "no video in the folder!" 
            clearList lst 
            forM_ ctnt $ \v -> addToList lst v =<< plainText (beaut v) 
            vLstAction lst chgdl statBar 
            return () 

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

    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

vLstAction lst chgdl statBar = do
    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 ()

    where fex itm = downloaded $ vidName itm