------------------------------------------------------------------------------
-- |
-- Module: Xmobar.App.Main
-- Copyright: (c) 2018, 2019, 2020, 2022 Jose Antonio Ortega Ruiz
-- License: BSD3-style (see LICENSE)
--
-- Maintainer: jao@gnu.org
-- Stability: unstable
-- Portability: portable
-- Created: Sun Nov 25, 2018 21:53
--
--
-- Support for creating executable main functions
--
------------------------------------------------------------------------------


module Xmobar.App.Main (xmobar, xmobarMain, configFromArgs) where

import qualified Data.Map as Map
import Data.List (intercalate)
import System.Posix.Process (executeFile)
import System.Environment (getArgs)
import System.FilePath ((</>), takeBaseName, takeDirectory, takeExtension)
import Text.Parsec.Error (ParseError)
import Data.List.NonEmpty (NonEmpty(..))
import Control.Monad (unless)

import Graphics.X11.Xlib

import Xmobar.Config.Types
import Xmobar.Config.Parse
import Xmobar.System.Signal (withDeferSignals)

import Xmobar.X11.Types
import Xmobar.X11.Text
import Xmobar.X11.Window
import Xmobar.App.Opts (recompileFlag, verboseFlag, getOpts, doOpts)
import Xmobar.App.CommandThreads (loop)
import Xmobar.App.EventLoop (startLoop)
import Xmobar.App.TextEventLoop (startTextLoop)
import Xmobar.App.Compile (recompile, trace)
import Xmobar.App.Config

xXmobar :: Config -> IO ()
xXmobar conf = withDeferSignals $ do
  initThreads
  d <- openDisplay ""
  fs <- initFont d (font conf)
  fl <- mapM (initFont d) (additionalFonts conf)
  let ic = Map.empty
      to = textOffset conf
      ts = textOffsets conf ++ replicate (length fl) (-1)
  loop conf $ \sig lock vars -> do
    (r,w) <- createWin d fs conf
    startLoop (XConf d r w (fs :| fl) (to :| ts) ic conf) sig lock vars

textXmobar :: Config -> IO ()
textXmobar conf = loop conf (startTextLoop conf)

xmobar :: Config -> IO ()
xmobar cfg = if textOutput cfg then textXmobar cfg else xXmobar cfg

configFromArgs :: Config -> IO Config
configFromArgs cfg = getArgs >>= getOpts >>= doOpts cfg . fst

buildLaunch :: [String] -> Bool -> Bool -> String -> ParseError -> IO ()
buildLaunch args verb force p e = do
  let exec = takeBaseName p
      confDir = takeDirectory p
      ext = takeExtension p
  if ext `elem` [".hs", ".hsc", ".lhs"]
    then xmobarDataDir >>= \dd -> recompile confDir dd exec force verb >>
         executeFile (confDir </> exec) False args Nothing
    else trace True ("Invalid configuration file: " ++ show e) >>
         trace True "\n(No compilation attempted: \
                    \only .hs, .hsc or .lhs files are compiled)"

xmobar' :: [String] -> Config -> IO ()
xmobar' defs cfg = do
  unless (null defs || not (verbose cfg)) $ putStrLn $
    "Fields missing from config defaulted: " ++ intercalate "," defs
  xmobar cfg

xmobarMain :: IO ()
xmobarMain = do
  args <- getArgs
  (flags, rest) <- getOpts args
  cf <- case rest of
          [c] -> return (Just c)
          [] -> xmobarConfigFile
          _ -> error $ "Too many arguments: " ++ show rest
  case cf of
    Nothing -> case rest of
                (c:_) -> error $ c ++ ": file not found"
                _ -> doOpts defaultConfig flags >>= xmobar
    Just p -> do r <- readConfig defaultConfig p
                 case r of
                   Left e ->
                     buildLaunch (filter (/= p) args) (verboseFlag flags)
                                 (recompileFlag flags) p e
                   Right (c, defs) -> doOpts c flags >>= xmobar' defs