-- |
-- Module      :  Main
-- Copyright   :  (c) OleksandrZhabenko 2019
-- License     :  MIT
--
-- Maintainer  :  olexandr543@yahoo.com
--
-- A program that can be used as a musical instrument synthesizer or for Ukrainian speech synthesis 
-- especially for poets, translators and writers. 
--


module Main (
  main
) where

import Data.Maybe (isJust,fromJust)
import System.IO 
import System.Environment
import System.Process
import EndOfExe
import Paths_mmsyn6ukr
import Melodics.Ukrainian

{-
-- Inspired by: https://mail.haskell.org/pipermail/beginners/2011-October/008649.html
-}

-- | The function creates a raw PCM sound file with bitrate 22050 Hz 1 mono channel 16-bit signed-integer encoding 
-- and tries to automatically convert it to the .wav file with the same parameters using the system binary SoX.
-- If it is not installed properly, the program makes ending informational message for the user.
main :: IO ()
main = do
         args <- getArgs
         putStrLn "Please, specify the name of the resulting sound file! Please, do NOT use '}' character and space characters!"
         nameOfSoundFile <- getLine
         xs <- getContents
         let ys = take (nSymbols (let zs = take 1 args in if null zs then [] else head zs)) xs in 
             withBinaryFile (nameOfSoundFile ++ ".raw") AppendMode (appendS16LEFile (convertToProperUkrainian ys))
         let ts = showE "sox" in if isJust ts
                      then callCommand $ fromJust ts ++ " -r22050 -c1 -L -e signed-integer -b16 " ++ nameOfSoundFile ++ ".raw " ++ nameOfSoundFile ++ ".wav"
                      else do 
                         putStr "You have a resulting file in a raw PCM format with bitrate 22050 Hz and 1 channel (mono) in the .raw format. "
                         putStr "You can further process it by yourself manually, otherwise, please, install FFMpeg or LibAV executables in the directory mentioned in the variable PATH"
                         putStrLn " and then run: "
                         putStrLn "\"name_of_FFMpeg_or_LibAV_executable\" -f s16le -acodec pcm_s16le -ac 1 -ar 22050 -i \"name_Of_the_sound_file\" \"the_same_name_without_.raw_ending_and_with_.wav_ending\""
                         putStrLn ""
                         putStrLn "OR you can install SoX executable in the directory mentioned in the variable PATH and then run: "
                         putStrLn "\"Path_to_the_SoX_executable\" -b16 -r22050 -c1 -e signed-integer -L \"name_of_the_file_in_raw_format_with_new._prefix\" \"name_of_the_file_in_raw_format_with_new._prefix\" in the terminal."