Refactored the neighborhood relationship

Startups/Game.hs

@@ -46,7 +46,7 @@ initGame = do
         playermap . ix pid %=   (pCompany .~ profile)
                               . (pCards .~ [getResourceCard profile Project])
                               . (pFunds .~ 3)
-                              . (pNeighborhood .~ M.fromList [(NLeft, ln), (NRight, rn)])
+                              . (pNeighborhood .~ (ln, rn))
                               . (pCompanyStage .~ Project)
 
 -- | A simple wrapper for getting random numbers.
@@ -104,7 +104,7 @@ resolveExchange pid exch = mconcat  . M.elems <$> itraverse resolveExchange' exc
             stt <- use playermap
             let cost = getSum $ reslist ^. folded . to (Sum . getExchangeCost pid neigh stt)
                 playermoney = fromMaybe 0 (stt ^? ix pid . pFunds)
-                neighname = stt ^. ix pid . pNeighborhood . ix neigh
+                neighname = stt ^. ix pid . neighbor neigh
                 neigresources = stt ^. ix neighname . to (availableResources Exchange)
             when (cost > playermoney) (throwError "A player tried to perform an exchange without enough funding")
             unless (any (reslist `MS.isSubsetOf`) neigresources) (throwError "The neighbor doesn't have enough resources")
@@ -218,7 +218,7 @@ rotateHands age cardmap = itraverse rotatePlayer cardmap
     where
         rotatePlayer pid _ = do
             -- get the identifier of the correct neighbor
-            neighid <- use (playermap . ix pid . pNeighborhood . ix direction)
+            neighid <- use (playermap . ix pid . neighbor direction)
             -- get his hand
             return (cardmap ^. ix neighid)
         direction = if age == Age2

Startups/GameTypes.hs

@@ -23,11 +23,13 @@ data GameState = GameState { _playermap   :: M.Map PlayerId PlayerState
                            , _rnd         :: StdGen
                            }
 
+type Neighborhood = (PlayerId, PlayerId)
+
 data PlayerState = PlayerState { _pCompany         :: CompanyProfile
                                , _pCompanyStage    :: CompanyStage
                                , _pCards           :: [Card]
                                , _pFunds           :: Funding
-                               , _pNeighborhood    :: M.Map Neighbor PlayerId
+                               , _pNeighborhood    :: Neighborhood
                                , _pPoachingResults :: [PoachingOutcome]
                                }
 
@@ -40,6 +42,10 @@ cardEffects = pCards . traverse . cEffect . traverse
 playerEffects :: PlayerId -> Traversal' GameState Effect
 playerEffects pid = playermap . ix pid . cardEffects
 
+neighbor :: Neighbor -> Lens' PlayerState PlayerId
+neighbor NLeft  = pNeighborhood . _1
+neighbor NRight = pNeighborhood . _2
+
 type Message = String
 
 data PlayerAction = PlayerAction ActionType Card

Startups/Utils.hs

@@ -106,7 +106,7 @@ getTargets pid targets stt = targets ^.. folded . to getTargets' . traverse
     where
         getPlayer p = stt ^. at p
         getTargets' Own = getPlayer pid
-        getTargets' (Neighboring n) = getPlayer pid >>= view (pNeighborhood . at n) >>= getPlayer
+        getTargets' (Neighboring n) = getPlayer pid >>= Just . view (neighbor n) >>= getPlayer
 
 -- | Given a condition, counts how often it hits. It can return an
 -- arbitrary Num because we will multiply this results with Funding or

tests/tests.hs

@@ -32,10 +32,10 @@ testState = GameState (M.fromList players) discard (mkStdGen 5)
         ppam = CompanyProfile Apple B
         ppoum = CompanyProfile Google A
         pbob = CompanyProfile Twitter A
-        pim  = PlayerState ppim Project pimcards 1 (M.fromList [(NLeft, "pam"), (NRight, "bob")]) []
-        pam  = PlayerState ppam Project pamcards 3 (M.fromList [(NLeft, "poum"), (NRight, "pim")]) []
-        poum = PlayerState ppoum Project poumcards 6 (M.fromList [(NLeft, "bob"), (NRight, "pam")]) []
-        bob  = PlayerState pbob Project bobcards 5 (M.fromList [(NLeft, "pim"), (NRight, "poum")]) []
+        pim  = PlayerState ppim Project pimcards 1 ("pam", "bob") []
+        pam  = PlayerState ppam Project pamcards 3 ("poum", "pim") []
+        poum = PlayerState ppoum Project poumcards 6 ("bob", "pam") []
+        bob  = PlayerState pbob Project bobcards 5 ("pim", "poum") []
         pimcards = map (getResourceCard ppim) [Project .. Stage1] <> map getCard [ "Cloud Servers"
                                                                                  , "Marketroid"
                                                                                  , "Company Nerf Battles"