{-# OPTIONS_GHC -Wno-type-defaults #-}

module Cut.CutVideo
  ( extract
  , Interval(..)
  , Silent
  , Sound
  , combine
  , combineOutput
  , extractDir
  )
where

import           Control.Lens
import           Control.Monad
import           Control.Monad.Catch
import           Cut.Analyze
import           Cut.Ffmpeg
import           Cut.Options
import           Data.Foldable
import           Data.Text           (Text)
import qualified Data.Text           as Text
import           Data.Text.Lens
import           Shelly              hiding (FilePath)
import           Text.Printf         (printf)

toArgs :: ListenCutOptions -> FilePath -> Interval Sound -> (Interval Sound, [Text])
toArgs options tmp inter =
  ( inter
  , -- keep ter interval for debugging
    ["-y", "-ss", start, "-t", duration, "-i", options ^. lc_fileio . in_file . packed]
    <> specifyTracks options
    <> [ Text.pack tmp
         <> "/"
         <> Text.pack (getOutFileName options)
         <> "-"
         <> fname
         <> ".mkv"
       ]
  )
 where
  start    = floatToText $ interval_start inter
  duration = floatToText $ interval_duration inter
  fname    = Text.pack $ printf "%010d" (truncate $ interval_start inter * 100 :: Integer)

extractDir :: FilePath
extractDir = "/extract"

extract :: ListenCutOptions -> FilePath -> [Interval Sound] -> IO ()
extract options tempDir intervals = do
  shelly $ mkdir_p exdir
  traverse_
      (\(inter, args) -> void $ catch (shelly $ ffmpeg' args) $ \exec -> do
        liftIO
          (print ("expection during edit: ", exec :: SomeException, args, inter)
          )
        pure ["expection"]
      )
    $   toArgs options exdir <$> intervals
  liftIO $ putStrLn "finish extracting"

  where
    exdir = tempDir <> extractDir

combineOutput :: FilePath
combineOutput = "combined-output.mkv"

combine :: FilePath -> Sh ()
combine tempDir = do
  output' <- ffmpeg' args
  liftIO $ print ("output", output')
 where -- https://stackoverflow.com/questions/7333232/how-to-concatenate-two-mp4-files-using-ffmpeg
  args =
    [ "-y"
    , "-f"
    , "concat"
    , "-safe"
    , "0"
    , "-i"
    , Text.pack (tempDir <> "/input.txt")
    , "-c"
    , "copy"
    , Text.pack $ tempDir <> "/" <> combineOutput
    ]