module Idris.Output where

import Idris.Core.TT
import Idris.Core.Evaluate (isDConName, isTConName, isFnName)

import Idris.AbsSyntax
import Idris.Delaborate
import Idris.Docstrings
import Idris.IdeSlave

import Util.Pretty
import Util.ScreenSize (getScreenWidth)

import Debug.Trace

import System.IO (stdout, Handle, hPutStrLn)

import Data.List (nub)
import Data.Maybe (fromMaybe)

pshow :: IState -> Err -> String
pshow ist err = displayDecorated (consoleDecorate ist) .
                renderPretty 1.0 80 .
                fmap (fancifyAnnots ist) $ pprintErr ist err

ihWarn :: Handle -> FC -> Doc OutputAnnotation -> Idris ()
ihWarn h fc err = do i <- getIState
                     case idris_outputmode i of
                       RawOutput ->
                         do err' <- iRender . fmap (fancifyAnnots i) $
                                    if fc_fname fc /= ""
                                      then text (show fc) <> colon <//> err
                                      else err
                            runIO . hPutStrLn h $ displayDecorated (consoleDecorate i) err'
                       IdeSlave n ->
                         do err' <- iRender . fmap (fancifyAnnots i) $ err
                            let (str, spans) = displaySpans err'
                            runIO . hPutStrLn h $
                              convSExp "warning" (fc_fname fc, fc_start fc, fc_end fc, str, spans) n

iRender :: Doc a -> Idris (SimpleDoc a)
iRender d = do w <- getWidth
               ist <- getIState
               let ideSlave = case idris_outputmode ist of
                                IdeSlave _ -> True
                                _          -> False
               case w of
                 InfinitelyWide -> return $ renderPretty 1.0 1000000000 d
                 ColsWide n -> return $
                               if n < 1
                                 then renderPretty 1.0 1000000000 d
                                 else renderPretty 0.8 n d
                 AutomaticWidth | ideSlave  -> return $ renderPretty 1.0 1000000000 d
                                | otherwise -> do width <- runIO getScreenWidth
                                                  return $ renderPretty 0.8 width d

-- | Write a pretty-printed term to the console with semantic coloring
consoleDisplayAnnotated :: Handle -> Doc OutputAnnotation -> Idris ()
consoleDisplayAnnotated h output = do ist <- getIState
                                      rendered <- iRender $ output
                                      runIO . hPutStrLn h .
                                        displayDecorated (consoleDecorate ist) $
                                        rendered

ihPrintTermWithType :: Handle -> Doc OutputAnnotation -> Doc OutputAnnotation -> Idris ()
ihPrintTermWithType h tm ty = ihRenderResult h (tm <+> colon <+> align ty)

-- | Pretty-print a collection of overloadings to REPL or IDESlave - corresponds to :t name
ihPrintFunTypes :: Handle -> [(Name, Bool)] -> Name -> [(Name, PTerm)] -> Idris ()
ihPrintFunTypes h bnd n []        = ihPrintError h $ "No such variable " ++ show n
ihPrintFunTypes h bnd n overloads = do ist <- getIState
                                       let ppo = ppOptionIst ist
                                       let infixes = idris_infixes ist
                                       let output = vsep (map (uncurry (ppOverload ppo infixes)) overloads)
                                       ihRenderResult h output
  where fullName n = prettyName True bnd n
        ppOverload ppo infixes n tm =
          fullName n <+> colon <+> align (pprintPTerm ppo bnd [] infixes tm)

ihRenderResult :: Handle -> Doc OutputAnnotation -> Idris ()
ihRenderResult h d = do ist <- getIState
                        case idris_outputmode ist of
                          RawOutput -> consoleDisplayAnnotated h d
                          IdeSlave n -> ideSlaveReturnAnnotated n h d

makeAnnName :: IState -> Name -> Maybe OutputAnnotation
makeAnnName ist n
  | isDConName    n ctxt = annName DataOutput
  | isFnName      n ctxt = annName FunOutput
  | isTConName    n ctxt = annName TypeOutput
  | isMetavarName n ist  = annName MetavarOutput
  | otherwise            = Nothing
  where ctxt = tt_ctxt ist
        docs = docOverview ist n
        ty   = Just (getTy ist n)
        
        annName :: NameOutput -> Maybe OutputAnnotation
        annName nameType = Just (AnnName n (Just nameType) docs ty)
        docOverview :: IState -> Name -> Maybe String -- pretty-print first paragraph of docs
        docOverview ist n = do docs <- lookupCtxtExact n (idris_docstrings ist)
                               let o   = overview (fst docs)
                                   -- TODO make width configurable
                                   out = displayS . renderPretty 1.0 50 $ renderDocstring o
                               return (out "")
        getTy :: IState -> Name -> String -- fails if name not already extant!
        getTy ist n = let theTy = pprintPTerm (ppOptionIst ist) [] [] (idris_infixes ist) $
                                  delabTy ist n
                      in (displayS . renderPretty 1.0 50 $ theTy) ""


fancifyAnnots :: IState -> OutputAnnotation -> OutputAnnotation
fancifyAnnots ist annot@(AnnName n _ _ _) = case makeAnnName ist n of
  Just fancyAnnot -> fancyAnnot
  Nothing         -> annot 
fancifyAnnots _ annot = annot


ideSlaveReturnWithStatus :: String -> Integer -> Handle -> Doc OutputAnnotation -> Idris ()
ideSlaveReturnWithStatus status n h out = do 
  ist <- getIState
  (str, spans) <- fmap displaySpans .
                  iRender .
                  fmap (fancifyAnnots ist) $
                  out
  let good = [SymbolAtom status, toSExp str, toSExp spans]
  runIO . hPutStrLn h $ convSExp "return" good n


-- | Write pretty-printed output to IDESlave with semantic annotations
ideSlaveReturnAnnotated :: Integer -> Handle -> Doc OutputAnnotation -> Idris ()
ideSlaveReturnAnnotated = ideSlaveReturnWithStatus "ok"

-- | Show an error with semantic highlighting
ihRenderError :: Handle -> Doc OutputAnnotation -> Idris ()
ihRenderError h e = do ist <- getIState
                       case idris_outputmode ist of
                         RawOutput -> consoleDisplayAnnotated h e
                         IdeSlave n -> ideSlaveReturnWithStatus "error" n h e

ihPrintWithStatus :: String -> Handle -> String -> Idris ()
ihPrintWithStatus status h s = do 
  i <- getIState
  case idris_outputmode i of
    RawOutput -> case s of
      "" -> return ()
      s  -> runIO $ hPutStrLn h s
    IdeSlave n ->
      let good = SexpList [SymbolAtom status, toSExp s] in
      runIO $ hPutStrLn h $ convSExp "return" good n


ihPrintResult :: Handle -> String -> Idris ()
ihPrintResult = ihPrintWithStatus "ok"

ihPrintError :: Handle -> String -> Idris ()
ihPrintError = ihPrintWithStatus "error"

ihputStrLn :: Handle -> String -> Idris ()
ihputStrLn h s = do i <- getIState
                    case idris_outputmode i of
                      RawOutput -> runIO $ hPutStrLn h s
                      IdeSlave n -> runIO . hPutStrLn h $ convSExp "write-string" s n

iputStrLn = ihputStrLn stdout
iPrintError = ihPrintError stdout
iPrintResult = ihPrintResult stdout
iWarn = ihWarn stdout

ideslavePutSExp :: SExpable a => String -> a -> Idris ()
ideslavePutSExp cmd info = do i <- getIState
                              case idris_outputmode i of
                                   IdeSlave n -> runIO . putStrLn $ convSExp cmd info n
                                   _ -> return ()

-- this needs some typing magic and more structured output towards emacs
iputGoal :: SimpleDoc OutputAnnotation -> Idris ()
iputGoal g = do i <- getIState
                case idris_outputmode i of
                  RawOutput -> runIO $ putStrLn (displayDecorated (consoleDecorate i) g)
                  IdeSlave n -> runIO . putStrLn $
                                convSExp "write-goal" (displayS (fmap (fancifyAnnots i) g) "") n

-- | Warn about totality problems without failing to compile
warnTotality :: Idris ()
warnTotality = do ist <- getIState
                  mapM_ (warn ist) (nub (idris_totcheckfail ist))
  where warn ist (fc, e) = iWarn fc (pprintErr ist (Msg e))