/**  The MIT License (MIT)

Copyright (c) 2016 Camil Staps

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE. */

implementation module CleanC

import StdEnv
from GenEq import generic gEq

:: State :== Int

derive gEq CType
derive gEq CParam
instance == CType where (==) x y = gEq{|*|} x y
instance == CParam where (==) x y = gEq{|*|} x y

cNewState :: *State
cNewState = 42

instance toInt CParam where toInt (CI i) = i
instance toString CParam where toString (CS s) = s
instance toReal CParam where toReal (CR r) = r

instance fromCParam Int where fromCParam (CI i) = i
instance fromCParam String where fromCParam (CS s) = s
instance fromCParam Real where fromCParam (CR r) = r

instance fromInt CParam where fromInt i = CI i
instance fromString CParam where fromString s = CS s
instance fromReal CParam where fromReal r = CR r

instance toCParam Int where toCParam i = CI i
instance toCParam String where toCParam s = CS s
instance toCParam Real where toCParam r = CR r

instance toCParamList [CParam] where toCParamList ps = ps
instance toCParamList Int where toCParamList i = [CI i]
instance toCParamList String where toCParamList s = [CS s]
instance toCParamList Real where toCParamList r = [CR r]
instance toCParamList (a,b) | toCParam a & toCParam b
where toCParamList (x,y) = [toCParam x, toCParam y]
instance toCParamList (a,b,c) | toCParam a & toCParam b & toCParam c
where toCParamList (a,b,c) = [toCParam a, toCParam b, toCParam c]
instance toCParamList (a,b,c,d) | toCParam a & toCParam b & toCParam c & toCParam d
where toCParamList (a,b,c,d) = [toCParam a, toCParam b, toCParam c, toCParam d]
instance toCParamList (a,b,c,d,e) | toCParam a & toCParam b & toCParam c & toCParam d & toCParam e
where toCParamList (a,b,c,d,e) = [toCParam a, toCParam b, toCParam c, toCParam d, toCParam e]
instance toCParamList (a,b,c,d,e,f) | toCParam a & toCParam b & toCParam c & toCParam d & toCParam e & toCParam f
where toCParamList (a,b,c,d,e,f) = [toCParam a, toCParam b, toCParam c, toCParam d, toCParam e, toCParam f]
instance toCParamList (a,b,c,d,e,f,g) | toCParam a & toCParam b & toCParam c & toCParam d & toCParam e & toCParam f & toCParam g
where toCParamList (a,b,c,d,e,f,g) = [toCParam a, toCParam b, toCParam c, toCParam d, toCParam e, toCParam f, toCParam g]

cInit :: !*State -> *State
cInit s = code inline {
    ccall cleanInit ":V:I"
}

cPuti :: !Int !*State -> *State
cPuti i s = code inline {
    ccall cleanPuti "I:V:I"
}

cPuts :: !String !*State -> *State
cPuts s st = code inline {
    ccall cleanPuts "S:V:I"
}

cPutr :: !Real !*State -> *State
cPutr r st = code inline {
    ccall cleanPutr "R:V:I"
}

cPutParam :: !CParam -> *State -> *State
cPutParam (CI i) = cPuti i
cPutParam (CS s) = cPuts s
cPutParam (CR r) = cPutr r

cSetReturnType_ :: !Int !*State -> *State
cSetReturnType_ i s = code inline {
    ccall cleanSetReturnType "I:V:I"
}

cSetReturnType :: !CType -> *State -> *State
cSetReturnType Int = cSetReturnType_ 0
cSetReturnType String = cSetReturnType_ 1
cSetReturnType Real = cSetReturnType_ 2
cSetReturnType Void = cSetReturnType_ 3

cCall_ :: !String !*State -> *State
cCall_ f s = code inline {
    ccall cleanCall "S:V:I"
}

cGeti :: !*State -> (!Int, !*State)
cGeti s = code inline {
    ccall cleanGeti ":I:I"
}

cGets :: !*State -> (!String, !*State)
cGets s = code inline {
    ccall cleanGets ":S:I"
}

cGetr :: !*State -> (!Real, !*State)
cGetr s = code inline {
    ccall cleanGetr ":R:I"
}

cGetParam :: !CType !*State -> (!CParam, !*State)
cGetParam Int s
# (i,s)=cGeti s
= (CI i, s)
cGetParam String st
# (s,st) = cGets st
= (CS s, st)
cGetParam Real s
# (r,s)=cGetr s
= (CR r, s)

cCall :: !CType !String !a !*State -> (!CParam, !*State) | toCParamList a
cCall t f ps s = cCall` t f (toCParamList ps) s
where
    cCall` :: !CType !String ![CParam] !*State -> (!CParam, !*State)
    cCall` t f [] s
    # s = cSetReturnType t s
    # s = cCall_ f s
    | t == Void = (CV, s)
    | otherwise = cGetParam t s
    cCall` t f [p:ps] s
    # s = cPutParam p s
    = cCall` t f ps s