module Main (main) where

import Control.Monad

import Data.Maybe
import qualified Data.Text as T

import Text.Read (readMaybe)

import System.Console.GetOpt
import System.Directory
import System.Environment
import System.Exit
import System.FilePath
import System.FilePath.Glob

import Config
import Output
import Parser
import Process
import Run
import Util
import Version

data CmdlineOptions = CmdlineOptions
    { optTest :: TestOptions
    , optShowVersion :: Bool
    , optVerbose :: Bool
    }

defaultCmdlineOptions :: CmdlineOptions
defaultCmdlineOptions = CmdlineOptions
    { optTest = defaultTestOptions
    , optShowVersion = False
    , optVerbose = False
    }

options :: [OptDescr (CmdlineOptions -> CmdlineOptions)]
options =
    [ Option ['T'] ["tool"]
        (ReqArg (\str -> to $ \opts -> case break (==':') str of
                                            (path, []) -> opts { optDefaultTool = path }
                                            (pname, (_:path)) -> opts { optProcTools = (ProcName (T.pack pname), path) : optProcTools opts }
                ) "PATH")
        "test tool to be used"
    , Option ['v'] ["verbose"]
        (NoArg (\opts -> opts { optVerbose = True }))
        "show output of processes and successful tests"
    , Option ['t'] ["timeout"]
        (ReqArg (\str -> to $ \opts -> case readMaybe str of
                                            Just timeout -> opts { optTimeout = timeout }
                                            Nothing -> error "timeout must be a number") "SECONDS")
        "default timeout in seconds with microsecond precision"
    , Option ['g'] ["gdb"]
        (NoArg $ to $ \opts -> opts { optGDB = True })
        "run GDB and attach spawned processes"
    , Option ['f'] ["force"]
        (NoArg $ to $ \opts -> opts { optForce = True })
        "remove test directory if it already exists instead of stopping"
    , Option ['k'] ["keep"]
        (NoArg $ to $ \opts -> opts { optKeep = True })
        "keep test directory even if all tests succeed"
    , Option ['V'] ["version"]
        (NoArg $ \opts -> opts { optShowVersion = True })
        "show version and exit"
    ]
  where
    to f opts = opts { optTest = f (optTest opts) }

main :: IO ()
main = do
    configPath <- findConfig
    config <- mapM parseConfig configPath
    let baseDir = maybe "." dropFileName configPath

    envtool <- lookupEnv "EREBOS_TEST_TOOL" >>= \mbtool ->
        return $ fromMaybe (error "No test tool defined") $ mbtool `mplus` (return . (baseDir </>) =<< configTool =<< config)

    let initOpts = defaultCmdlineOptions
            { optTest = defaultTestOptions
                { optDefaultTool = envtool
                , optTestDir = normalise $ baseDir </> optTestDir defaultTestOptions
                }
            }

    args <- getArgs
    (opts, ofiles) <- case getOpt Permute options args of
        (o, files, []) -> return (foldl (flip id) initOpts o, files)
        (_, _, errs) -> ioError (userError (concat errs ++ usageInfo header options))
            where header = "Usage: erebos-tester [OPTION...]"

    when (optShowVersion opts) $ do
        putStrLn versionLine
        exitSuccess

    getPermissions (head $ words $ optDefaultTool $ optTest opts) >>= \perms -> do
        when (not $ executable perms) $ do
            fail $ optDefaultTool (optTest opts) <> " is not executable"

    files <- if not (null ofiles)
        then return ofiles
        else concat <$> mapM (flip globDir1 baseDir) (maybe [] configTests config)
    when (null files) $ fail $ "No test files"

    out <- startOutput $ optVerbose opts
    ok <- allM (runTest out $ optTest opts) . concat =<< mapM parseTestFile files
    when (not ok) exitFailure