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

-- |
-- Module      :  Phonetic.Languages.General.Common
-- Copyright   :  (c) OleksandrZhabenko 2020-2021
-- License     :  MIT
-- Stability   :  Experimental
-- Maintainer  :  olexandr543@yahoo.com
--
-- Is rewritten from the module Phonetic.Languages.Common from the package @phonetic-languages-simplified-examples-common@.
--

module Phonetic.Languages.General.Common (
  fLines
  , fLinesIO
) where

import Data.Phonetic.Languages.PrepareText
import Data.Char (isAlpha)
import Data.Monoid (mappend)

fLines
 :: Concatenations -- ^ Data used to concatenate the basic grammar preserving words and word sequences to the next word to
 -- leave the most of the meaning (semantics) of the text available to easy understanding while reading and listening to.
 -> String
 -> String
 -> String
 -> Int
 -> String
 -> [String]
fLines ysss xs us vs !toOneLine ys = filter (any (\x -> isPLL xs x && isAlpha x)) . prepareText ysss xs .
         (\z -> if toOneLine == 1 then unls z else z) $ ys
           -- the 'unls' is taken from the 'Data.List.words' and rewritten to be equal to 'unwords' . 'words'
           where unls s  =  case dropWhile (`elem` (' ':us `mappend` vs)) s of
                             "" -> []
                             s' -> w `mappend` (' ' : unls s'')
                                where (w, s'') = break (`elem` (' ':us `mappend` vs)) s'

fLinesIO
 :: Concatenations -- ^ Data used to concatenate the basic grammar preserving words and word sequences to the next word to
 -- leave the most of the meaning (semantics) of the text available to easy understanding while reading and listening to.
 -> String
 -> String
 -> String
 -> String
 -> IO ()
fLinesIO ysss xs us vs ys = mapM_ putStrLn . map (\(i,x) -> show (i + 1) ++ "\t" ++ x) . helpG3 . indexedL "" .
  filter (any (\x -> isPLL xs x && isAlpha x)) . prepareText ysss xs $ ys

-- | Indexes the 'Foldable' structure using consequential 'Int' values.
indexedL :: Foldable t => b -> t b -> [(Int, b)]
indexedL y zs = foldr f v zs
  where !v = [(length zs,y)]
        f x ((j,z):ys) = (j-1,x):(j,z):ys
{-# INLINE indexedL #-}

helpG3 :: [a] -> [a]
helpG3 xs
 | null xs = []
 | otherwise = init xs