{-# LANGUAGE DeriveDataTypeable, PatternGuards #-}

module DefaultPlayer ( DefaultPlayer(..)
                     ) where


import qualified Data.Set as S
import Data.Fixed
import Data.Ratio ((%))
import Data.Typeable

import GLDriver
import Player
import Tank


data DefaultPlayer = DefaultPlayer (S.Set Key)
                     deriving (Typeable, Show)

instance Player DefaultPlayer where
    playerMovement (DefaultPlayer keys) _ = playerMovement' keys
    
    handleEvent (DefaultPlayer keys) ev
        | Just (KeyPressEvent key)   <- fromEvent ev = DefaultPlayer $ S.insert key keys
        | Just (KeyReleaseEvent key) <- fromEvent ev = DefaultPlayer $ S.delete key keys
        | otherwise = DefaultPlayer keys


playerMovement' :: S.Set Key -> (DefaultPlayer, Maybe Micro, Bool)
playerMovement' keys = (DefaultPlayer keys, angle, move)
    where
      x = (if (S.member KeyLeft keys) then (-1) else 0) + (if (S.member KeyRight keys) then 1 else 0)
      y = (if (S.member KeyDown keys) then (-1) else 0) + (if (S.member KeyUp keys) then 1 else 0)
      move = (x /= 0 || y /= 0)
      angle = if move then Just $ fromRational $ round ((atan2 y x)*1000000*180/pi)%1000000 else Nothing