module Grin.Show(
    prettyFun,
    prettyVal,
    prettyExp,
    printGrin,
    hPrintGrin,
    graphGrin,
    graphGrinRegions,
    render
    ) where

import Char
import Control.Monad.Writer
import Data.Maybe
import IO
import Monad
import qualified Data.Map as Map
import qualified Data.Set as Set

import StringTable.Atom
import C.Prims
import Data.Graph.Inductive.Graph(mkGraph)
import Data.Graph.Inductive.Tree
import Doc.Attr
import Doc.DocLike
import Doc.PPrint
import Doc.Pretty
import Grin.Grin
import Grin.Noodle
import Grin.Val
import Options
import Support.CanType
import Support.FreeVars
import Util.Graphviz
import qualified Cmm.Op as Op
import qualified FlagDump as FD



instance DocLike d => PPrint d Val   where
    pprint v = prettyVal v


instance PPrint Doc Exp   where
    pprint v = prettyExp empty v

pVar [] = empty
pVar v  = prettyVals v <+> operator "<- "

pVar' v  = prettyVals v <+> operator "<- "

prettyVals [] = prettyVal Unit
prettyVals [x] = prettyVal x
prettyVals xs = tupled (map prettyVal xs)

attr = if dump FD.Html then html else ansi

bold :: Doc -> Doc
bold = attrBold attr
color n x = attrColor attr n x

--color :: Int -> Doc -> Doc
--color 1 doc = oob (attr [1]) <> doc <> oob (attr [0])
--color c doc = oob (attr [c]) <> doc <> oob (attr [39])

operator = bold . text
keyword = bold . text
tag x = text x
func = color "lightgreen" . text
prim = color "red" . text
--func = text
--tag = color 92 . text


isComplex (_ :>>= _) = True
isComplex _ = False

isOneLine (_ :>>= _) = False
isOneLine Case {} = False
isOneLine Let {} = False
isOneLine MkCont {} = False
isOneLine _ = True

{-# NOINLINE prettyExp #-}
prettyExp vl (e1 :>>= v :-> e2) | isComplex e1 = align $ ((pVar' v) <> (prettyExp empty e1)) <$> prettyExp vl e2
prettyExp vl (e1 :>>= v :-> e2) = align (prettyExp (pVar v) e1 <$> prettyExp vl e2)
prettyExp vl (Return []) = vl <> keyword "return" <+> text "()"
prettyExp vl (Return [v]) = vl <> keyword "return" <+> prettyVal v
prettyExp vl (Return vs) = vl <> keyword "return" <+> tupled (map prettyVal vs)
prettyExp vl (Store v@Var {}) | getType v == tyDNode = vl <> keyword "demote" <+> prettyVal v
prettyExp vl (Store v) = vl <> keyword "store" <+> prettyVal v
prettyExp vl (Fetch v@Var {}) | getType v == tyINode = vl <> keyword "promote" <+> prettyVal v
prettyExp vl (Fetch v) = vl <> keyword "fetch" <+> prettyVal v
prettyExp vl (Error "" _) = vl <> prim "exitFailure"
prettyExp vl (Error s _) = vl <> keyword "error" <+> tshow s
prettyExp vl (App t [v] _) | t == funcEval = vl <> keyword "eval" <+> prettyVal v
prettyExp vl (App t [a] _) | t == funcApply = vl <> keyword "apply" <+> prettyVal a
prettyExp vl (App t [a,b] _) | t == funcApply = vl <> keyword "apply" <+> prettyVal a <+> prettyVal b
prettyExp vl (App a vs _)  = vl <> func (fromAtom a) <+> hsep (map prettyVal vs)
prettyExp vl Prim { expPrimitive = APrim (Op (Op.BinOp bo _ _) _) _, expArgs = [x,y] } | Just (op,_) <- Op.binopInfix bo = vl <> prettyVal x <+> operator op <+> prettyVal y
prettyExp vl Prim { expPrimitive = APrim (Op (Op.BinOp bo _ _) _) _, expArgs = [x,y] } = vl <> prettyVal x <+> char '`' <> tshow bo <> char '`' <+> prettyVal y
prettyExp vl Prim { expPrimitive = APrim (Peek t) _, expArgs = [v] }  = vl <> prim (show t) <> char '[' <> prettyVal v <> char ']'
prettyExp vl Prim { expPrimitive = ap, expArgs = vs } = vl <> prim (pprint ap) <+> hsep (map prettyVal vs)
prettyExp vl (Update x y) = vl <> keyword "update" <+> prettyVal x <+> prettyVal y
prettyExp vl (Case v vs) = vl <> keyword "case" <+> prettyVal v <+> keyword "of" <$> indent 2 (vsep (map f vs)) where
    f (~[v] :-> e) | isOneLine e = prettyVal v <+> operator "->" <+> prettyExp empty e
    f (~[v] :-> e) = prettyVal v <+> operator "->" <+> keyword "do" <$> indent 2 (prettyExp empty e)
prettyExp vl NewRegion { expLam = (r :-> body)} = vl <> keyword "region" <+> text "\\" <> prettyVals r <+> text "-> do" <$> indent 2 (prettyExp empty body)
--prettyExp vl MkCont { expCont = (r :-> body) } = vl <> keyword "continuation" <+> text "\\" <> prettyVal r <+> text "-> do" <$> indent 2 (prettyExp empty body)
prettyExp vl Let { expDefs = defs, expBody = body } = vl <> keyword "let" <$> indent 4 (vsep $ map f defs) <$> text " in" <$> indent 2 (prettyExp empty body) where
    f FuncDef { funcDefName = name, funcDefBody = as :-> body } = func (show name) <+> hsep (map prettyVal as) <+> operator "=" <+> keyword "do" <$> indent 2 (prettyExp empty body)
prettyExp vl Alloc { expValue = val, expCount = Lit n _, expRegion = r }| n == 1 = vl <> keyword "alloc" <+> prettyVal val <+> text "at" <+> prettyVal r
prettyExp vl Alloc { expValue = val, expCount = count, expRegion = r } = vl <> keyword "alloc" <+> prettyVal val <> text "[" <> prettyVal count <> text "]" <+> text "at" <+> prettyVal r
prettyExp vl Call { expValue = Item t (TyCall fun _ _), expArgs = vs, expJump = jump } | fun `elem` [Function,LocalFunction] =  vl <> f jump  <+> func (fromAtom t) <+> hsep (map prettyVal vs) where
    f True = text "jump to"
    f False = text "call"
prettyExp vl Call { expValue = Var v (TyCall fun _ _), expArgs = vs, expJump = jump}  =  vl <> f jump fun  <+> color "lightgreen" (pprint v) <+> hsep (map prettyVal vs) where
    f False Continuation = text "cut to"
    f False Function = text "call"
    f True Function = text "jump to"
    f False Closure = text "enter"
    f True Closure = text "jump into"
prettyExp vl Call { expValue = ValPrim ap [] (TyCall Primitive' _ _), expArgs = vs } = vl <> prim (tshow ap) <+> hsep (map prettyVal vs)

{-# NOINLINE prettyVal #-}
prettyVal :: DocLike d => Val -> d
prettyVal s | Just [] <- valToList s = text "[]"
prettyVal s | Just st <- fromVal s = text $ show (st::String)
prettyVal s | Just vs <- valToList s = list $ map prettyVal vs
prettyVal (NodeC t []) = parens $ tag (fromAtom t)
prettyVal (NodeC t vs) = parens $ tag (fromAtom t) <+> hsep (map prettyVal vs)
prettyVal (Index p off) = prettyVal p <> char '[' <> prettyVal off <> char ']'
prettyVal v@Var {} = tshow v
prettyVal (Lit i _)  = tshow i
prettyVal (Const v) = char '&' <> prettyVal v
prettyVal (ValUnknown ty) = text "?::" <> tshow ty
prettyVal Unit = text "()"
prettyVal (Item a  ty) = tshow a <> text "::" <> tshow ty
prettyVal (ValPrim aprim args ty) = f aprim args where
    f aprim [] = pprint aprim <> text "::" <> tshow ty
    f (APrim (Op (Op.BinOp bo _ _) _) _) [x,y] | Just (op,prec) <- Op.binopInfix bo = parens (pprintPrec prec x <+> text op <+> pprintPrec prec y)
    f (APrim (Op (Op.BinOp bo _ _) _) _) [x,y] =  parens $ pprintPrec 1 x <+> char '`' <> tshow bo <> char '`' <+> pprintPrec 1 y
    f aprim xs = pprint aprim <> tupled (map tshow xs) <> text "::" <> tshow ty

instance DocLike d => PPrint d Var where
    pprint (V i) = text $ 'v':show i
--pv (V 0) = char '_'
--pv (V i) = char 'v' <> tshow i


prettyFun :: (Atom,Lam) -> Doc
prettyFun (n,(as :-> e)) = func (fromAtom n) <+> hsep (map prettyVal as) <+> operator "=" <+> keyword "do" <$> indent 2 (prettyExp empty e)

render :: Doc -> String
render doc =  displayS (renderPretty 0.95 (optColumns options)  doc) ""

printGrin :: Grin -> IO ()
printGrin grin = hPrintGrin stderr grin

hPrintGrin :: Handle -> Grin -> IO ()
hPrintGrin handle grin@Grin { grinCafs = cafs } = do
    when (not $ null cafs) $ do
        hPutStrLn handle "-- Cafs"
        mapM_ (hPutStrLn handle) $ map (\(x,y) -> show x ++ " := " ++  render (prettyVal y))  cafs
    hPutStrLn handle "-- Functions"
    forM_ (grinFuncs grin) $ \ f@(n,l :-> e) -> do
        hPutStrLn handle . render $ func (fromAtom n) <+> operator "::" <+> hsep (map (tshow . getType) l)  <+> operator "->" <+> tshow (getType e)
        hPutStrLn handle (render $ prettyFun f)
        hPutStrLn handle ""


{-# NOINLINE graphGrin #-}

graphGrin :: Grin -> String
graphGrin grin = graphviz' gr [] fnode fedge  where
    nodes = zip [0..] (grinFuncs grin)
    nodeMap = Map.fromList [ (y,x) | (x,(y,_)) <- nodes]
    gr :: Gr (Atom,Lam) CallType
    gr =   mkGraph nodes [ (n,n2,tc) | (n,(_,_ :-> l)) <- nodes, (tc,fv) <- Set.toList (freeVars l), n2 <- maybeToList $ Map.lookup fv nodeMap ]
    fnode :: (Atom,Lam) -> [(String,String)]
    fnode (x,_ :-> e) = [("label",show x)]
        ++ (if hasError e then [("color","red")] else [])
        ++ (if x `elem` grinEntryPointNames grin then [("shape","box")] else [])
    fedge :: CallType -> [(String,String)]
    fedge TailCall = [("style","dotted")]
    fedge StandardCall = []

graphGrinRegions :: Grin -> String
graphGrinRegions grin
  = case filter isMainEntry (grinFunctions grin) of
      []      -> "No main entry"
      (fun:_) -> ""--undefined
  where isMainEntry fun = funcDefName fun `Map.member` grinEntryPoints grin
        funToGraph nRegion regionMap graph fun
          = undefined

hasError x = isNothing (hasError' x)
hasError' Error {} = Nothing
hasError' e = mapExpExp hasError' e


data CallType = TailCall | StandardCall
    deriving(Ord,Show,Eq)

instance FreeVars Exp (Set.Set (CallType,Atom)) where
    freeVars (a :>>= _ :-> b) = freeVars b `Set.union` Set.map (\ (_ :: CallType,y) -> (StandardCall, y)) (freeVars a)
    freeVars (App a _ _) = Set.singleton (TailCall,a)
    freeVars e = execWriter $ mapExpExp (\e -> tell (freeVars e) >> return e) e