{-# LANGUAGE ApplicativeDo #-}

module Main (main) where

--------------------------------------------------------------------------------

import Commands.Extra
import Commands.MicroJuvix
import Commands.MiniHaskell
import Commands.Termination as T
import Control.Monad.Extra
import MiniJuvix.Prelude hiding (Doc)
import qualified MiniJuvix.Syntax.Abstract.Pretty.Ansi as A
import qualified MiniJuvix.Syntax.Concrete.Language as M
import qualified MiniJuvix.Syntax.Concrete.Parser as M
import qualified MiniJuvix.Syntax.Concrete.Scoped.Pretty.Ansi as M
import MiniJuvix.Syntax.Concrete.Scoped.Pretty.Base (defaultOptions)
import qualified MiniJuvix.Syntax.Concrete.Scoped.Pretty.Base as M
import MiniJuvix.Syntax.Concrete.Scoped.Pretty.Html
import qualified MiniJuvix.Syntax.Concrete.Scoped.Pretty.Text as T
import qualified MiniJuvix.Syntax.Concrete.Scoped.Scoper as M
import qualified MiniJuvix.Syntax.MicroJuvix.Pretty.Ansi as Micro
import qualified MiniJuvix.Termination as T
import qualified MiniJuvix.Termination.CallGraph as A
import qualified MiniJuvix.Translation.AbstractToMicroJuvix as Micro
import qualified MiniJuvix.Translation.ScopedToAbstract as A
import MiniJuvix.Utils.Version (runDisplayVersion)
import Options.Applicative
import Options.Applicative.Help.Pretty
import Text.Show.Pretty hiding (Html)

--------------------------------------------------------------------------------

data Command
  = Scope ScopeOptions
  | Parse ParseOptions
  | Html HtmlOptions
  | Termination TerminationCommand
  | MiniHaskell MiniHaskellOptions
  | MicroJuvix MicroJuvixOptions
  | DisplayVersion

data ScopeOptions = ScopeOptions
  { _scopeRootDir :: FilePath,
    _scopeInputFiles :: [FilePath],
    _scopeShowIds :: Bool,
    _scopeInlineImports :: Bool,
    _scopeNoColors :: Bool
  }

data ParseOptions = ParseOptions
  { _parseInputFile :: FilePath,
    _parseNoPrettyShow :: Bool
  }

data HtmlOptions = HtmlOptions
  { _htmlInputFile :: FilePath,
    _htmlRecursive :: Bool,
    _htmlTheme :: Theme
  }

parseHtml :: Parser HtmlOptions
parseHtml = do
  _htmlInputFile <- parseInputFile
  _htmlRecursive <-
    switch
      ( long "recursive"
          <> help "export imported modules recursively"
      )
  _htmlTheme <-
    option
      (eitherReader parseTheme)
      ( long "theme"
          <> metavar "THEME"
          <> value Ayu
          <> showDefault
          <> help "selects a theme: ayu (light); nord (dark)"
      )
  pure HtmlOptions {..}
  where
    parseTheme :: String -> Either String Theme
    parseTheme s = case s of
      "nord" -> Right Nord
      "ayu" -> Right Ayu
      _ -> Left $ "unrecognised theme: " <> s

parseParse :: Parser ParseOptions
parseParse = do
  _parseInputFile <- parseInputFile
  _parseNoPrettyShow <-
    switch
      ( long "no-pretty-show"
          <> help "Disable formatting of the Haskell AST"
      )
  pure ParseOptions {..}

parseScope :: Parser ScopeOptions
parseScope = do
  _scopeRootDir <-
    strOption
      ( long "rootDir"
          <> short 'd'
          <> metavar "DIR"
          <> value "."
          <> showDefault
          <> help "Root directory"
      )
  _scopeInputFiles <-
    some $
      argument
        str
        ( metavar "MINIJUVIX_FILE(s)"
            <> help "Path to one ore more MiniJuvix files"
        )
  _scopeShowIds <-
    switch
      ( long "show-name-ids"
          <> help "Show the unique number of each identifier"
      )
  _scopeInlineImports <-
    switch
      ( long "inline-imports"
          <> help "Show the code of imported modules next to the import statement"
      )
  _scopeNoColors <-
    switch
      ( long "no-colors"
          <> help "Disable ANSI formatting"
      )
  pure ScopeOptions {..}

parseDisplayVersion :: Parser Command
parseDisplayVersion =
  flag'
    DisplayVersion
    (long "version" <> short 'v' <> help "Print the version and exit")

descr :: ParserInfo Command
descr =
  info
    (parseCommand <**> helper)
    ( fullDesc
        <> progDesc "The MiniJuvix compiler."
        <> headerDoc (Just headDoc)
        <> footerDoc (Just foot)
    )
  where
    headDoc :: Doc
    headDoc = dullblue $ bold $ underline "MiniJuvix help"

    foot :: Doc
    foot = bold "maintainers: " <> "The MiniJuvix Team"

parseCommand :: Parser Command
parseCommand =
  parseDisplayVersion
    <|> ( hsubparser $
            mconcat
              [ commandParse,
                commandScope,
                commandHtml,
                commandTermination,
                commandMicroJuvix,
                commandMiniHaskell
              ]
        )
  where
    commandMicroJuvix :: Mod CommandFields Command
    commandMicroJuvix = command "microjuvix" minfo
      where
        minfo :: ParserInfo Command
        minfo =
          info
            (MicroJuvix <$> parseMicroJuvix)
            (progDesc "Translate a MiniJuvix file to MicroJuvix")

    commandMiniHaskell :: Mod CommandFields Command
    commandMiniHaskell = command "minihaskell" minfo
      where
        minfo :: ParserInfo Command
        minfo =
          info
            (MiniHaskell <$> parseMiniHaskell)
            (progDesc "Translate a MiniJuvix file to MiniHaskell")

    commandParse :: Mod CommandFields Command
    commandParse = command "parse" minfo
      where
        minfo :: ParserInfo Command
        minfo =
          info
            (Parse <$> parseParse)
            (progDesc "Parse a MiniJuvix file")

    commandHtml :: Mod CommandFields Command
    commandHtml = command "html" minfo
      where
        minfo :: ParserInfo Command
        minfo =
          info
            (Html <$> parseHtml)
            (progDesc "Generate HTML for a MiniJuvix file")

    commandScope :: Mod CommandFields Command
    commandScope = command "scope" minfo
      where
        minfo :: ParserInfo Command
        minfo =
          info
            (Scope <$> parseScope)
            (progDesc "Parse and scope a MiniJuvix file")

    commandTermination :: Mod CommandFields Command
    commandTermination = command "termination" minfo
      where
        minfo :: ParserInfo Command
        minfo =
          info
            (Termination <$> parseTerminationCommand)
            (progDesc "Subcommands related to termination checking")

mkScopePrettyOptions :: ScopeOptions -> M.Options
mkScopePrettyOptions ScopeOptions {..} =
  M.defaultOptions
    { M._optShowNameId = _scopeShowIds,
      M._optInlineImports = _scopeInlineImports
    }

parseModuleIO :: FilePath -> IO (M.Module 'M.Parsed 'M.ModuleTop)
parseModuleIO = fromRightIO id . M.runModuleParserIO

go :: Command -> IO ()
go c = do
  root <- getCurrentDirectory
  case c of
    DisplayVersion -> runDisplayVersion
    Scope opts@ScopeOptions {..} -> do
      forM_ _scopeInputFiles $ \scopeInputFile -> do
        m <- parseModuleIO scopeInputFile
        (_ , s) <- fromRightIO' printErrorAnsi $ M.scopeCheck1IO root m
        printer (mkScopePrettyOptions opts) s
      where
        printer :: M.Options -> M.Module 'M.Scoped 'M.ModuleTop -> IO ()
        printer
          | not _scopeNoColors = M.printPrettyCode
          | otherwise = T.printPrettyCode
    Parse ParseOptions {..} -> do
      m <- parseModuleIO _parseInputFile
      if _parseNoPrettyShow then print m else pPrint m
    Html HtmlOptions {..} -> do
      m <- parseModuleIO _htmlInputFile
      (_ , s) <- fromRightIO' printErrorAnsi $ M.scopeCheck1IO root m
      genHtml defaultOptions _htmlRecursive _htmlTheme s
    MicroJuvix MicroJuvixOptions {..} -> do
      m <- parseModuleIO _mjuvixInputFile
      (_, s) <- fromRightIO' printErrorAnsi $ M.scopeCheck1IO root m
      a <- fromRightIO' putStrLn (return $ A.translateModule s)
      let mini = Micro.translateModule a
      Micro.printPrettyCodeDefault mini
    MiniHaskell MiniHaskellOptions {..} -> do
      m <- parseModuleIO _mhaskellInputFile
      (_ , s) <- fromRightIO' printErrorAnsi $ M.scopeCheck1IO root m
      -- a <- fromRightIO' putStrLn (return $ A.translateModule s)
      _ <- fromRightIO' putStrLn (return $ A.translateModule s)
      -- let mini = Micro.translateModule a
      -- Micro.printPrettyCodeDefault mini
      -- TODO
      error "todo"
    Termination (Calls opts@CallsOptions {..}) -> do
      m <- parseModuleIO _callsInputFile
      (_ , s) <- fromRightIO' printErrorAnsi $ M.scopeCheck1IO root m
      a <- fromRightIO' putStrLn (return $ A.translateModule s)
      let callMap0 = T.buildCallMap a
          callMap = case _callsFunctionNameFilter of
            Nothing -> callMap0
            Just f -> T.filterCallMap f callMap0
          opts' = T.callsPrettyOptions opts
      A.printPrettyCode opts' callMap
      putStrLn ""
    Termination (CallGraph CallGraphOptions {..}) -> do
      m <- parseModuleIO _graphInputFile
      (_ , s) <- fromRightIO' printErrorAnsi $ M.scopeCheck1IO root m
      a <- fromRightIO' putStrLn (return $ A.translateModule s)
      let callMap = T.buildCallMap a
          opts' = A.defaultOptions
          completeGraph = T.completeCallGraph callMap
          filteredGraph = maybe completeGraph (`T.unsafeFilterGraph` completeGraph) _graphFunctionNameFilter
          recBehav = map T.recursiveBehaviour (T.reflexiveEdges filteredGraph)
      A.printPrettyCode opts' filteredGraph
      putStrLn ""
      forM_ recBehav $ \r -> do
        let n = M.renderPrettyCode M.defaultOptions $ A._recBehaviourFunction r
        A.printPrettyCode A.defaultOptions r
        putStrLn ""
        case T.findOrder r of
          Nothing -> putStrLn (n <> " Fails the termination checking")
          Just (T.LexOrder k) -> putStrLn (n <> " Terminates with order " <> show (toList k))
        putStrLn ""

main :: IO ()
main = execParser descr >>= go