import Data.List.Split
import Data.Char as Char
import Data.List as List
import Data.Either as Either

main = do
    software <-  getList <$> getContents
    let combs = getComb [5,6,7,8,9]
    --mapM putStrLn(map show combs)
    putStrLn(show $ List.maximum ( map (\x-> part2 ( prepareAmps x software) 0 ) combs ))
    -- let output = calcthruster software [4,3,2,1,0] 

data Amplifier = Amplifier{ state :: [Int]
                            ,index :: Int
                            ,input :: [Int]
                            ,output :: [Int] } deriving Show
getList :: String -> [Int]
getList = map read . splitOn ","

getComb :: [Int] -> [[Int]]
getComb array = filter ((5==).length.(List.nub)) $ mapM (const array) [1..5] 

prepareAmps :: [Int] -> [Int] -> [Amplifier]
prepareAmps (p1:p2:p3:p4:p5:_) software = do
      let a = step (Amplifier software 0 [] []) [p1]
      let b = step (Amplifier software 0 [] []) [p2]
      let c = step (Amplifier software 0 [] []) [p3]
      let d = step (Amplifier software 0 [] []) [p4]
      let e = step (Amplifier software 0 [] [0]) [p5]
      let e2 = Amplifier (state e) (index e) (input e) [0]
      [a,b,c,d,e2]

part2 :: [Amplifier] -> Int -> Int
part2 amps lastOuput = do
        let ampA = link (amps!!4) (amps!!0) 
        let ampB = link (ampA) (amps!!1)  
        let ampC = link (ampB) (amps!!2) 
        let ampD = link (ampC) (amps!!3) 
        let ampE = link (ampD) (amps!!4)  
        if index ampE == -1 
               then lastOuput
        else part2 ([ampA,ampB,ampC,ampD,ampE]) (head(output ampE))
link :: Amplifier -> Amplifier -> Amplifier
link left calc 
  | null (output left) = Amplifier (state calc) (-1) (input calc) (output calc)
  | index left == -1 = Amplifier (state calc) (-1) (input calc) (output calc)
  | otherwise = step calc ([last $ output left])

step :: Amplifier -> [Int] -> Amplifier
step amp input = operation (drop (index amp) (state amp)) (state amp) (index amp) input []


calcthrusters :: [Int] -> [Int] -> Int -> Int
calcthrusters software (p1:p2:p3:p4:p5:_) start = do
        let outputA = operation software software 0 [p1, start] []
        let outputB = operation software software 0 [p2, last $ output outputA] []
        let outputC = operation software software 0 [p3, last $ output outputB] []
        let outputD = operation software software 0 [p4, last $ output outputC] []
        let outputE = operation software software 0 [p5, last $ output outputD] []
        last $ output outputE 


operation :: [Int] -> [Int] -> Int -> [Int] -> [Int] -> Amplifier
operation (99:_) state i input output = 
          Amplifier state i input output
operation (op:xs) state i input output 
  | last (digits op) == 1 = do
           let newindex = i + 4
           let newstate = add (fillup (revertdigs op) 5) (xs!!0) (xs!!1) (xs!!2) state
           operation ((drop newindex newstate))  (newstate) newindex input output
  | last (digits op) == 2 = do 
           let newindex = i + 4
           let newstate = mult (fillup (revertdigs op) 5) (xs!!0) (xs!!1) (xs!!2) state
           operation ((drop newindex newstate))  (newstate) newindex input output
  | last (digits op) == 3 = do
           if (length input) == 0
              then (Amplifier state i input output)  
              else do
                let newindex = i + 2
                let newstate = put (fillup (revertdigs op) 3) (xs!!0) (head input) state
                let newinput = drop 1 input  
                operation  (drop newindex newstate) (newstate) newindex newinput output 
  | last (digits op) == 4 = do
           let newindex = i + 2 
           let newoutput = out (fillup (revertdigs op) 3) output (xs!!0) state
           let newinput = drop 1 input
           operation ((drop newindex state))  (state) newindex input (newoutput)
  | (last (digits op) == 5 )  = do
           let newindex = jumpif (fillup (revertdigs op) 4) (xs!!0) (xs!!1) i state
           operation  ((drop newindex state))  (state) newindex input output
  | (last (digits op) == 6 )  = do
           let newindex = jumpifnot (fillup (revertdigs op) 4) (xs!!0) (xs!!1) i state
           operation  ((drop newindex state)) (state) newindex input output
  | (last (digits op) == 7 ) = do
           let newindex = i + 4
           let newstate = lessthan (fillup (revertdigs op) 5) (xs!!0) (xs!!1) (xs!!2) state
           operation  ((drop newindex newstate))  (newstate) newindex input output  
  | (last (digits op) == 8 ) = do
           let newindex = i + 4
           let newstate = equal (fillup (revertdigs op) 5) (xs!!0) (xs!!1) (xs!!2) state
           operation  ((drop newindex newstate))  (newstate) newindex input output

add :: [Int] -> Int -> Int -> Int -> [Int] -> [Int]
add (op1:op2:m1:m2:m3:_) p1 p2 p3 state = 
         Main.insert state sum p3 
         where
            sum = (getValue m1 p1 state)  + (getValue m2 p2 state)

mult :: [Int] -> Int -> Int -> Int -> [Int] -> [Int]
mult (op1:op2:m1:m2:m3:_) p1 p2 p3 state = 
         Main.insert state sum p3 
         where
            sum = (getValue m1 p1 state) * (getValue m2 p2 state)

put :: [Int] -> Int -> Int -> [Int] -> [Int]
put(op1:op2:m1:_) p1 input state =
         Main.insert state input p1

out :: [Int] -> [Int] -> Int -> [Int] -> [Int]
out (op1:op2:m1:_) output p1 state =
        output ++ [(getValue m1 p1 state)]

jumpif :: [Int] -> Int -> Int -> Int -> [Int] -> Int
jumpif (op1:op2:m1:m2:_) p1 p2 index state
        | (getValue m1 p1 state) /= 0 = getValue m2 p2 state
        | otherwise =  index + 3

jumpifnot :: [Int] -> Int -> Int -> Int -> [Int] -> Int
jumpifnot (op1:op2:m1:m2:_) p1 p2 index state
        | (getValue m1 p1 state) == 0 = getValue m2 p2 state
        | otherwise = index + 3

lessthan :: [Int] -> Int -> Int -> Int -> [Int] -> [Int]
lessthan (op1:op2:m1:m2:m3:_) p1 p2 p3 state 
        | (getValue m1 p1 state) < (getValue m2 p2 state) = Main.insert state 1 p3
        | otherwise = Main.insert state 0 p3

equal :: [Int] -> Int -> Int -> Int -> [Int] -> [Int]
equal (op1:op2:m1:m2:m3:_) p1 p2 p3 state 
        | (getValue m1 p1 state) == (getValue m2 p2 state) = Main.insert state 1 p3
        | otherwise = Main.insert state 0 p3


insert ::  [Int] -> Int -> Int -> [Int]
insert xs value index = do
                let split = splitAt index xs
                (fst split)++ [value] ++ (drop 1 (snd split))

digits :: Int -> [Int]
digits = map Char.digitToInt . show

revertdigs :: Int -> [Int]
revertdigs 0 = []
revertdigs x = x `mod` 10 : revertdigs (x `div` 10)

fillup :: [Int] -> Int -> [Int]
fillup array x = array ++ (replicate (x - (length array)) 0)

getValue :: Int -> Int -> [Int] -> Int
getValue 0 index array = array !! index
getValue 1 index array = index