{-# OPTIONS_GHC -threaded -rtsopts #-}
{-# OPTIONS_HADDOCK show-extensions #-}
{-# LANGUAGE BangPatterns #-}

-- |
-- Module      :  Main
-- Copyright   :  (c) OleksandrZhabenko 2020
-- License     :  MIT
-- Stability   :  Experimental
-- Maintainer  :  olexandr543@yahoo.com
--
-- Inspired by: https://functional-art.org/2020/papers/Poetry-OleksandrZhabenko.pdf from the https://functional-art.org/2020/performances ;
-- Allows to rewrite the given text (usually a poetical one).

module Main where

import Phonetic.Languages.Array.Ukrainian.PropertiesSyllablesG2
import Text.Read (readMaybe)
import Data.Maybe (fromMaybe)
import System.Environment (getArgs)
import Data.Char (isDigit)
import Phonetic.Languages.Common
import Phonetic.Languages.Lines

-- | The function allows to rewrite the Ukrainian text in the file given as the first command line argument to a new file. In between, it is rewritten
-- so that every last word on the lines is preserved at its position, and the rest of the line is rearranged using the specified other command line
-- arguments. They are general for the whole program. The first command line argument is a FilePath to the file with a Ukrainian text to be rewritten.
-- The second one is a variant of the \"properties\" used to evaluate the variants.
-- The further command line arguments are: the number of the intervals and the numbers of the intervals
-- that are swapped with the maximum one so that they are available for further usage by the program. See documentation for @uniqueness-periods-vector-filters@
-- package
-- 'https://hackage.haskell.org/package/uniqueness-periods-vector-filters'
--
-- @since 0.2.0.0
-- You can also run program in a \'comparative\' mode by specifying \"+C\" as one of the command line arguments and then
-- three files -- the first two -- the existing ones with probably rewritten text by the program for different arguments
-- and the third one is the resulting file. While running in such a mode the program outputs line-by-line the contents of
-- the two first files and writes one of them (or an empty line if neither one) to the third file.
main :: IO ()
main = do
 args0 <- getArgs
 let coeffs = readCF . concat . take 1 $ args0 -- The first command line argument. If not sure, pass just \"1_\".
     compare2 = (\xs -> if null xs then False else True) . filter (== "+C") $ args0
 if compare2 then do
   let args1 = filter (/= "+C") args0
       file1 = concat . take 1 $ args1
       file2 = concat . drop 1 . take 2 $ args1
       file3 = concat . drop 2 . take 3 $ args1
   if file3 /= file1 && file3 /= file2 then compareFilesToOneCommon file1 file2 file3
   else do
    putStrLn "You specified some files twice being in the comparative mode, the program has no well-defined behaviour in such a mode. "
    putStrLn "Please, run it again and specify the three different arguments with the first two being the existing files. "
 else do
  if isPair coeffs then do
   let !numericArgs = filter (all isDigit) . drop 3 $ args0
       !choice = concat . drop 2 . take 3 $ args0
       !numberI = fromMaybe 1 (readMaybe (concat . take 1 $ numericArgs)::Maybe Int)
       !file = concat . drop 1 . take 2 $ args0
   generalProcessment coeffs numericArgs choice numberI file
  else do
   let !numericArgs = filter (all isDigit) . drop 2 $ args0
       !choice = concat . drop 1 . take 2 $ args0
       !numberI = fromMaybe 1 (readMaybe (concat . take 1 $ numericArgs)::Maybe Int)
       !file = concat . take 1 $ args0
   generalProcessment coeffs numericArgs choice numberI file