module Main where

import Control.Monad
import Data.Char
import System.Environment
import System.Exit
import qualified System.Info as System (os)
import System.Process

-- import AST
import Compiler
import Interpreter
import Parser
import Optimiser


data ExecutionMode = EMInterpret | EMCompile

executionMode :: ExecutionMode
executionMode = EMCompile


main :: IO ()
main = do
    args <- getArgs
    when (length args == 0 || length args > 2)
        $ die "Usage: bfcomphs <source.bf>"
    let fname = head args

    prog <- readFile fname >>= either die return . parseProgram

    -- putStrLn $ astSuccinct prog
    -- print prog
    let opt = optimise prog
    -- writeFile (fname ++ ".succinct") $ astSuccinct opt
    -- writeFile (fname ++ ".ast") $ show opt

    case executionMode of
        EMInterpret -> do
            input <- getContents
            output <- interpret opt $ map (fromIntegral . ord) input
            putStr $ map (chr . fromIntegral) output
        EMCompile -> do
            writeFile (fname ++ ".asm") $ compile opt

            let format = case System.os of
                            "darwin" -> "macho64"
                            "linux" -> "elf64"
                            _ -> undefined

            callProcess "yasm" ["-f", format, fname ++ ".asm", "-o", fname ++ ".o"]
            callProcess "gcc" [fname ++ ".o", "-o", fname ++ ".exe"]