-- SPDX-FileCopyrightText: 2020 Tocqueville Group
--
-- SPDX-License-Identifier: LicenseRef-MIT-TQ

-- | Parsing of Michelson instructions.

module Michelson.Parser.Instr
  ( primInstr
  , ops'
  -- * These are handled separately to have better error messages
  , mapOp
  , pairOp
  , cmpOp
  , dupOp
  ) where

import Prelude hiding (EQ, GT, LT, many, note, some, try)

import Text.Megaparsec (choice, notFollowedBy, sepEndBy, try)
import qualified Text.Megaparsec.Char.Lexer as L

import Michelson.Let (LetValue(..))
import Michelson.Macro (ParsedInstr, ParsedOp(..))
import Michelson.Parser.Annotations
import Michelson.Parser.Lexer
import Michelson.Parser.Type
import Michelson.Parser.Types (Parser, letValues)
import Michelson.Parser.Value
import Michelson.Untyped

-- | Parser for primitive Michelson instruction (no macros and extensions).
primInstr :: Parser (Contract' ParsedOp) -> Parser ParsedOp -> Parser ParsedInstr
primInstr contractParser opParser = choice
  [ dropOp, swapOp, digOp, dugOp, pushOp opParser, someOp, noneOp, unitOp
  , ifNoneOp opParser, carOp, cdrOp, leftOp, rightOp, ifLeftOp opParser, nilOp
  , consOp, ifConsOp opParser, sizeOp, emptySetOp, emptyMapOp, emptyBigMapOp, iterOp opParser
  , memOp, getOp, updateOp, loopLOp opParser, loopOp opParser
  , lambdaOp opParser, execOp, applyOp, dipOp opParser, failWithOp, castOp, renameOp, levelOp
  , concatOp, packOp, unpackOp, sliceOp, isNatOp, addressOp, addOp, subOp
  , mulOp, edivOp, absOp, negOp, lslOp, lsrOp, orOp, andOp, xorOp, notOp
  , compareOp, eqOp, neqOp, ltOp, leOp, gtOp, geOp, intOp, selfOp, contractOp
  , transferTokensOp, setDelegateOp
  , createContractOp contractParser, implicitAccountOp, nowOp, amountOp
  , balanceOp, checkSigOp, sha256Op, sha512Op, blake2BOp, hashKeyOp
  , sourceOp, senderOp, chainIdOp, sha3Op, keccakOp
  ]

-- | Parse a sequence of instructions.
ops' :: Parser ParsedOp -> Parser [ParsedOp]
ops' opParser = (braces $ sepEndBy opParser (optional semicolon)) <|> (pure <$> opParser)

-- Control Structures

failWithOp :: Parser ParsedInstr
failWithOp = word' "FAILWITH" FAILWITH

loopOp :: Parser ParsedOp -> Parser ParsedInstr
loopOp opParser = word' "LOOP" LOOP <*> ops' opParser

loopLOp :: Parser ParsedOp -> Parser ParsedInstr
loopLOp opParser = word' "LOOP_LEFT" LOOP_LEFT <*> ops' opParser

execOp :: Parser ParsedInstr
execOp = word' "EXEC" EXEC <*> noteDef

applyOp :: Parser ParsedInstr
applyOp = word' "APPLY" APPLY <*> noteDef

-- Parses both `DIP` and `DIP n`.
dipOp :: Parser ParsedOp -> Parser ParsedInstr
dipOp opParser = parseWithOptionalParameter "DIP" DIPN DIP <*> ops' opParser

-- Helper for instructions which have optional numeric non-negative parameter.
parseWithOptionalParameter :: Text -> (Word -> instr) -> instr -> Parser instr
parseWithOptionalParameter instrName constructorWithParam constructorNoParam =
  symbol' instrName *>
  (try (constructorWithParam <$> lexeme L.decimal) <|> pure constructorNoParam)

-- Stack Operations

-- Parses both `DROP` and `DROP n`.
dropOp :: Parser ParsedInstr
dropOp = parseWithOptionalParameter "DROP" DROPN DROP

dupOp :: Parser ParsedInstr
dupOp = word' "DUP" DUP <*> noteDef

swapOp :: Parser ParsedInstr
swapOp = word' "SWAP" SWAP;

digOp :: Parser ParsedInstr
digOp = word' "DIG" DIG <*> lexeme L.decimal

dugOp :: Parser ParsedInstr
dugOp = word' "DUG" DUG <*> lexeme L.decimal

pushOp :: Parser ParsedOp -> Parser ParsedInstr
pushOp opParser = do
  symbol' "PUSH"
  v <- noteDef
  (try $ pushLet v) <|> (push' v)
  where
    pushLet v = do
      lvs <- asks letValues
      lv <- mkLetVal lvs
      return $ PUSH v (lvSig lv) (lvVal lv)
    push' v = PUSH v <$> type_ <*> value' opParser

unitOp :: Parser ParsedInstr
unitOp = do symbol' "UNIT"; (t, v) <- notesTV; return $ UNIT t v

lambdaOp :: Parser ParsedOp -> Parser ParsedInstr
lambdaOp opParser =
  word' "LAMBDA" LAMBDA <*> noteDef <*> type_ <*> type_ <*> ops' opParser

-- Generic comparison

cmpOp :: Parser ParsedInstr
cmpOp = eqOp <|> neqOp <|> ltOp <|> gtOp <|> leOp <|> gtOp <|> geOp

eqOp :: Parser ParsedInstr
eqOp = word' "EQ" EQ <*> noteDef

neqOp :: Parser ParsedInstr
neqOp = word' "NEQ" NEQ <*> noteDef

ltOp :: Parser ParsedInstr
ltOp = word' "LT" LT <*> noteDef

gtOp :: Parser ParsedInstr
gtOp = word' "GT" GT <*> noteDef

leOp :: Parser ParsedInstr
leOp = word' "LE" LE <*> noteDef

geOp :: Parser ParsedInstr
geOp = word' "GE" GE <*> noteDef

-- ad-hoc comparison

compareOp :: Parser ParsedInstr
compareOp = word' "COMPARE" COMPARE <*> noteDef

-- Operations on booleans

orOp :: Parser ParsedInstr
orOp = word' "OR"  OR <*> noteDef

andOp :: Parser ParsedInstr
andOp = word' "AND" AND <*> noteDef

xorOp :: Parser ParsedInstr
xorOp = word' "XOR" XOR <*> noteDef

notOp :: Parser ParsedInstr
notOp = word' "NOT" NOT <*> noteDef

-- Operations on integers and natural numbers

addOp :: Parser ParsedInstr
addOp = word' "ADD" ADD <*> noteDef

subOp :: Parser ParsedInstr
subOp = word' "SUB" SUB <*> noteDef

mulOp :: Parser ParsedInstr
mulOp = word' "MUL" MUL <*> noteDef

edivOp :: Parser ParsedInstr
edivOp = word' "EDIV"EDIV <*> noteDef

absOp :: Parser ParsedInstr
absOp = word' "ABS" ABS <*> noteDef

negOp :: Parser ParsedInstr
negOp = word' "NEG" NEG <*> noteDef

-- Bitwise logical operators

lslOp :: Parser ParsedInstr
lslOp = word' "LSL" LSL <*> noteDef

lsrOp :: Parser ParsedInstr
lsrOp = word' "LSR" LSR <*> noteDef

-- Operations on string's

concatOp :: Parser ParsedInstr
concatOp = word' "CONCAT" CONCAT <*> noteDef

sliceOp :: Parser ParsedInstr
sliceOp = word' "SLICE" SLICE <*> noteDef

-- Operations on pairs
pairOp :: Parser ParsedInstr
pairOp = do symbol' "PAIR"; (t, v, (p, q)) <- notesTVF2; return $ PAIR t v p q

carOp :: Parser ParsedInstr
carOp = do symbol' "CAR"; (v, f) <- notesVF; return $ CAR v f

cdrOp :: Parser ParsedInstr
cdrOp = do symbol' "CDR"; (v, f) <- notesVF; return $ CDR v f

-- Operations on collections (sets, maps, lists)

emptySetOp :: Parser ParsedInstr
emptySetOp = do symbol' "EMPTY_SET"; (t, v) <- notesTV;
                EMPTY_SET t v <$> typeWithParen

emptyMapOp :: Parser ParsedInstr
emptyMapOp = do symbol' "EMPTY_MAP"; (t, v) <- notesTV; a <- typeWithParen;
                EMPTY_MAP t v a <$> type_

emptyBigMapOp :: Parser ParsedInstr
emptyBigMapOp = do symbol' "EMPTY_BIG_MAP"; (t, v) <- notesTV; a <- typeWithParen;
                   EMPTY_BIG_MAP t v a <$> type_

memOp :: Parser ParsedInstr
memOp = word' "MEM" MEM <*> noteDef

updateOp :: Parser ParsedInstr
updateOp = word' "UPDATE" UPDATE <*> noteDef

iterOp :: Parser ParsedOp -> Parser ParsedInstr
iterOp opParser = word' "ITER" ITER <*> ops' opParser

sizeOp :: Parser ParsedInstr
sizeOp = word' "SIZE" SIZE <*> noteDef

mapOp :: Parser ParsedOp -> Parser ParsedInstr
mapOp opParser = word' "MAP" MAP <*>  noteDef <*> ops' opParser

getOp :: Parser ParsedInstr
getOp = word' "GET" GET <*> noteDef

nilOp :: Parser ParsedInstr
nilOp = do symbol' "NIL"; (t, v) <- notesTV; NIL t v <$> type_

consOp :: Parser ParsedInstr
consOp = do
  try . lexeme $ do
    void $ string' "CONS"
    notFollowedBy (string' "T")
  CONS <$> noteDef

ifConsOp :: Parser ParsedOp -> Parser ParsedInstr
ifConsOp opParser = word' "IF_CONS" IF_CONS <*> ops' opParser <*> ops' opParser

-- Operations on options

someOp :: Parser ParsedInstr
someOp = do symbol' "SOME"; (t, v) <- notesTV; return $ SOME t v

noneOp :: Parser ParsedInstr
noneOp = do symbol' "NONE"; (t, v) <- notesTV; NONE t v <$> type_

ifNoneOp :: Parser ParsedOp -> Parser ParsedInstr
ifNoneOp opParser = word' "IF_NONE" IF_NONE <*> ops' opParser <*> ops' opParser

-- Operations on unions

-- Using `notesTVF2Def` instead of `notesTVF2` allows for the second annotation
-- to be unspecified.
leftOp :: Parser ParsedInstr
leftOp = do symbol' "LEFT"; (t, v, (f, f')) <- notesTVF2Def;
               LEFT t v f f' <$> type_

rightOp :: Parser ParsedInstr
rightOp = do symbol' "RIGHT"; (t, v, (f, f')) <- notesTVF2Def;
               RIGHT t v f f' <$> type_

ifLeftOp :: Parser ParsedOp -> Parser ParsedInstr
ifLeftOp opParser = word' "IF_LEFT" IF_LEFT <*> ops' opParser <*> ops' opParser

-- Operations on contracts

createContractOp :: Parser (Contract' ParsedOp) -> Parser ParsedInstr
createContractOp contractParser =
  word' "CREATE_CONTRACT" CREATE_CONTRACT
    <*> noteDef <*> noteDef <*> braces contractParser

transferTokensOp :: Parser ParsedInstr
transferTokensOp = word' "TRANSFER_TOKENS" TRANSFER_TOKENS <*> noteDef

setDelegateOp :: Parser ParsedInstr
setDelegateOp = word' "SET_DELEGATE" SET_DELEGATE <*> noteDef

balanceOp :: Parser ParsedInstr
balanceOp = word' "BALANCE" BALANCE <*> noteDef

contractOp :: Parser ParsedInstr
contractOp = word' "CONTRACT" CONTRACT <*> noteDef <*> noteDef <*> type_

sourceOp :: Parser ParsedInstr
sourceOp = word' "SOURCE" SOURCE <*> noteDef

senderOp :: Parser ParsedInstr
senderOp = word' "SENDER" SENDER <*> noteDef

amountOp :: Parser ParsedInstr
amountOp = word' "AMOUNT" AMOUNT <*> noteDef

implicitAccountOp :: Parser ParsedInstr
implicitAccountOp = word' "IMPLICIT_ACCOUNT" IMPLICIT_ACCOUNT <*> noteDef

selfOp :: Parser ParsedInstr
selfOp = word' "SELF" SELF <*> noteDef <*> noteDef

addressOp :: Parser ParsedInstr
addressOp = word' "ADDRESS" ADDRESS <*> noteDef

-- Special Operations

nowOp :: Parser ParsedInstr
nowOp = word' "NOW" NOW <*> noteDef

levelOp :: Parser ParsedInstr
levelOp = word' "LEVEL" LEVEL <*> noteDef

chainIdOp :: Parser ParsedInstr
chainIdOp = word' "CHAIN_ID" CHAIN_ID <*> noteDef

-- Operations on bytes

packOp :: Parser ParsedInstr
packOp = word' "PACK" PACK <*> noteDef

unpackOp :: Parser ParsedInstr
unpackOp = do symbol' "UNPACK"; (t, v) <- notesTV; UNPACK t v <$> type_

-- Cryptographic Primitives

checkSigOp :: Parser ParsedInstr
checkSigOp = word' "CHECK_SIGNATURE" CHECK_SIGNATURE <*> noteDef

blake2BOp :: Parser ParsedInstr
blake2BOp = word' "BLAKE2B" BLAKE2B <*> noteDef

sha256Op :: Parser ParsedInstr
sha256Op = word' "SHA256" SHA256 <*> noteDef

sha512Op :: Parser ParsedInstr
sha512Op = word' "SHA512" SHA512 <*> noteDef

sha3Op :: Parser ParsedInstr
sha3Op = word' "SHA3" SHA3 <*> noteDef

keccakOp :: Parser ParsedInstr
keccakOp = word' "KECCAK" KECCAK <*> noteDef

hashKeyOp :: Parser ParsedInstr
hashKeyOp = word' "HASH_KEY" HASH_KEY <*> noteDef

-- Type operations

castOp :: Parser ParsedInstr
castOp = word' "CAST" CAST <*> noteDef <*> type_

renameOp :: Parser ParsedInstr
renameOp = word' "RENAME" RENAME <*> noteDef

isNatOp :: Parser ParsedInstr
isNatOp = word' "ISNAT" ISNAT <*> noteDef

intOp :: Parser ParsedInstr
intOp = word' "INT" INT <*> noteDef