--{-# LANGUAGE TupleSections #-}
module Dodge.Creature.Perception (
    perceptionUpdate,
    chaseCritPerceptionUpdate,
    visionCheck,
) where

import Control.Lens
import Control.Monad
import qualified Data.Map.Strict as M
import Data.Maybe
import Dodge.Base.Collide
import Dodge.Creature.Radius
import Dodge.Creature.Vocalization
import Dodge.Data.World
import Dodge.FloatFunction
import Geometry.Data
import Geometry.Vector
import qualified IntMapHelp as IM
import Linear
import RandomHelp
import Sound.Data

perceptionUpdate ::
    -- | List of creature ids that may direct attention and awareness
    [Int] ->
    World ->
    Creature ->
    Creature
perceptionUpdate is w = rememberSounds w . basicAwarenessUpdate . basicAttentionUpdate is w

chaseCritPerceptionUpdate :: [Int] -> World -> Creature -> Creature
chaseCritPerceptionUpdate is w =
    rememberSounds w . chaseCritAwarenessUpdate w . basicAttentionUpdate is w

{- | Update a creatures awareness based upon the creatures' current direction
 of attention
-} -- TODO delete?
basicAwarenessUpdate :: Creature -> Creature
basicAwarenessUpdate cr = case _cpAttention $ _crPerception cr of
    Fixated i ->
        cr & crPerception . cpAwareness
            %~ (IM.insert i (Cognizant 10000) . IM.mapMaybe decreaseAwareness)
    AttentiveTo is ->
        cr
            & crPerception . cpAwareness
                %~ (IM.mapMaybe decreaseAwareness . IM.unionWith combineAwareness is)
            & maybeBark
      where
        oldAwareness = _cpAwareness $ _crPerception cr
        newAwareness =
            (IM.mapMaybe decreaseAwareness . IM.unionWith combineAwareness is)
                oldAwareness
        becomesCognizant =
            any isCognizant $ IM.unionWith cogRaised oldAwareness newAwareness
        thejitter = [RandomImpulse $ RandImpulseCircMove 1]
        maybeBark = fromMaybe id $ do
            guard becomesCognizant
            sid <- vocalizationTest cr
            return $
                crActionPlan . apAction
                    .~ [ImpulsesList ([Bark sid] : replicate 5 thejitter)]

-- TODO fold in randgen update, requires that this is a world to world function
chaseCritAwarenessUpdate :: World -> Creature -> Creature
chaseCritAwarenessUpdate w cr = case _cpAttention $ _crPerception cr of
    Fixated i ->
        cr & crPerception . cpAwareness
            %~ (IM.insert i (Cognizant 10000) . IM.mapMaybe decreaseAwareness)
    AttentiveTo is ->
        cr
            & crPerception . cpAwareness
                %~ (IM.mapMaybe decreaseAwareness . IM.unionWith combineAwareness is)
            & maybeBark
      where
        oldAwareness = _cpAwareness $ _crPerception cr
        newAwareness =
            (IM.mapMaybe decreaseAwareness . IM.unionWith combineAwareness is)
                oldAwareness
        becomesCognizant =
            any isCognizant $
                IM.unionWith cogRaised oldAwareness newAwareness
        thejitter = [RandomImpulse $ RandImpulseCircMove 3]
        maybeBark = fromMaybe id $ do
            guard becomesCognizant
            guard $ cr ^? crVocalization . vcCoolDown == Just 0
            let soundid = evalState (takeOne (crWarningSounds cr)) (_randGen w)
                numjits = fst $ randomR (15, 25) (_randGen w)
            return $
                (crActionPlan . apStrategy .~ WarningCry)
                    . ( crActionPlan . apAction
                            .~ [ ImpulsesList
                                    ( [Bark soundid] :
                                      replicate numjits thejitter
                                        ++ [[ChangeStrategy $ CloseToMelee 0]]
                                    )
                               , AimAt 0 (w ^?! cWorld . lWorld . creatures . ix 0 . crPos . _xy)
                               ]
                      )

cogRaised :: Awareness -> Awareness -> Awareness
cogRaised Suspicious{} Cognizant{} = Cognizant 100
cogRaised _ _ = Suspicious 0

isCognizant :: Awareness -> Bool
isCognizant Cognizant{} = True
isCognizant _ = False

combineAwareness :: Awareness -> Awareness -> Awareness
combineAwareness (Suspicious x) (Suspicious y)
    | x + y < 5000 = Suspicious $ x + y
    | otherwise = Cognizant 1000
combineAwareness (Suspicious x) (Cognizant y) = Cognizant $ min 10000 $ x + y
combineAwareness (Cognizant x) (Suspicious y) = Cognizant $ min 10000 $ x + y
combineAwareness (Cognizant x) (Cognizant y) = Cognizant $ min 10000 $ x + y

-- | Decrease awareness level. Returns 'Maybe' value for use with 'IM.mapMaybe'
decreaseAwareness :: Awareness -> Maybe Awareness
decreaseAwareness (Suspicious 0) = Nothing
decreaseAwareness (Suspicious x) = Just $ Suspicious (x - 50)
decreaseAwareness (Cognizant 0) = Just $ Suspicious 1000
decreaseAwareness (Cognizant x) = Just $ Cognizant $ x - 50

{- | Given a fixed group of creatures, direct attention to those of them that
 - are in view.
-}
basicAttentionUpdate ::
    -- | Creatures that may attract this creature's attention
    [Int] ->
    World ->
    Creature ->
    Creature
basicAttentionUpdate cids w cr =
    cr & crPerception . cpAttention
        .~ AttentiveTo (IM.mapMaybe (newExtraAwareness cr w) $ IM.fromList $ zip cids cids)

newExtraAwareness ::
    -- | source creature
    Creature ->
    World ->
    -- | target creature id
    Int ->
    Maybe Awareness
newExtraAwareness cr w cid
    | dist cpos tpos > 600 = Nothing
    | not $ canSeeIndirect (_crID cr) cid w = Nothing
    | otherwise = Just . Suspicious $ visionCheck cr tpos * awakeLevelPerception cr
  where
    tpos = w ^?! cWorld . lWorld . creatures . ix cid . crPos . _xy -- _crPos $ _creatures (_cWorld w) IM.! cid
    cpos = cr ^. crPos . _xy

visionCheck :: Creature -> Point2 -> Float
visionCheck cr tpos = doFloatFloat (_viFOV vi) ang * doFloatFloat (_viDist vi) d
  where
    vi = _cpVision $ _crPerception cr
    cpos = cr ^. crPos . _xy
    dirvec = unitVectorAtAngle (_crDir cr)
    ang = angleVV dirvec (tpos - (cpos - crRad (cr ^. crType) *^ dirvec))
    d = dist tpos cpos

awakeLevelPerception :: Creature -> Float
awakeLevelPerception cr = case _cpVigilance $ _crPerception cr of
    Comatose -> 0
    Asleep -> 10
    Lethargic -> 100
    Vigilant -> 1000
    Overstrung -> 10000

newSounds :: World -> [(Point2, Float)]
newSounds = mapMaybe f . M.elems . _playingSounds
  where
    f s = case _playStatus $ _soundStatus s of
        JustStartedPlaying -> Just (_soundPos s, _soundVolume s)
        _ -> Nothing

rememberSounds :: World -> Creature -> Creature
rememberSounds w cr =
    cr & crMemory . soundsToInvestigate
        .~ map fst (filter (soundIsClose w cr) (newSounds w))

-- TODO work out correct form for sounds passing through walls
soundIsClose :: World -> Creature -> (Point2, Float) -> Bool
soundIsClose w cr (pos, vol) =
    dist cpos pos < 2000
        && vol > doFloatFloat (_auDist . _cpAudition $ _crPerception cr) (dist pos cpos)
        && hasLOS cpos pos w
  where
    cpos = cr ^. crPos . _xy