{-# LANGUAGE OverloadedStrings #-}

module FFICXX.Generate.Util where

import Data.Char (toLower, toUpper)
import Data.List (intercalate)
import Data.List.Split (splitOn)
import Data.Maybe (fromMaybe)
import Data.Text (Text)
import qualified Data.Text as T
import qualified Data.Text.Lazy as TL
import Data.Text.Template
  ( Context,
    substitute,
  )

moduleDirFile :: String -> (String, String)
moduleDirFile mname =
  let splitted = splitOn "." mname
      moddir = intercalate "/" (init splitted)
      modfile = (last splitted) <> ".hs"
   in (moddir, modfile)

hline :: IO ()
hline = putStrLn "--------------------------------------------------------"

toUppers :: String -> String
toUppers = map toUpper

toLowers :: String -> String
toLowers = map toLower

firstLower :: String -> String
firstLower [] = []
firstLower (x : xs) = (toLower x) : xs

firstUpper :: String -> String
firstUpper [] = []
firstUpper (x : xs) = (toUpper x) : xs

conn :: String -> String -> String -> String
conn st x y = x <> st <> y

connspace :: String -> String -> String
connspace = conn " "

conncomma :: String -> String -> String
conncomma = conn ", "

connBSlash :: String -> String -> String
connBSlash = conn "\\\n"

connSemicolonBSlash :: String -> String -> String
connSemicolonBSlash = conn "; \\\n"

connRet :: String -> String -> String
connRet = conn "\n"

connRet2 :: String -> String -> String
connRet2 = conn "\n\n"

connArrow :: String -> String -> String
connArrow = conn " -> "

intercalateWith :: (String -> String -> String) -> (a -> String) -> [a] -> String
intercalateWith f mapper x
  | not (null x) = foldl1 f (map mapper x)
  | otherwise = ""

intercalateWithM :: (Monad m) => (String -> String -> String) -> (a -> m String) -> [a] -> m String
intercalateWithM f mapper x
  | not (null x) = do
    ms <- mapM mapper x
    return (foldl1 f ms)
  | otherwise = return ""

-- TODO: deprecate this and use contextT
context :: [(Text, String)] -> Context
context assocs x = maybe err (T.pack) . lookup x $ assocs
  where
    err = error $ "Could not find key: " <> (T.unpack x)

-- TODO: Rename this to context.
-- TODO: Proper error handling.
contextT :: [(Text, Text)] -> Context
contextT assocs x = fromMaybe err . lookup x $ assocs
  where
    err = error $ T.unpack ("Could not find key: " <> x)

subst :: Text -> Context -> String
subst t c = TL.unpack (substitute t c)