{-# LANGUAGE DeriveDataTypeable, PatternGuards #-}

module DefaultPlayer ( DefaultPlayer(..)
                     ) where


import qualified Data.Set as S
import Data.Fixed
import Data.Ratio ((%))
import Data.Typeable
import Graphics.Rendering.OpenGL.GL (GLfloat, Vector3(..), Vertex2(..))
import Graphics.Rendering.OpenGL.GL.BeginEnd (unsafeRenderPrimitive, PrimitiveMode(..))
import Graphics.Rendering.OpenGL.GL.CoordTrans (unsafePreservingMatrix, translate, rotate)
import Graphics.Rendering.OpenGL.GL.VertexSpec

import Tank
import GLDriver
import Player



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

instance Player DefaultPlayer where
    playerUpdate (DefaultPlayer keys aimx aimy shoot) tank =
        let 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)
            ax = aimx - (fromRational . toRational . tankX $ tank)
            ay = aimy - (fromRational . toRational . tankY $ tank)
            move = (x /= 0 || y /= 0)
            angle = if move then Just $ fromRational $ round ((atan2 y x)*1000000*180/pi)%1000000 else Nothing
            aangle = if (ax /= 0 || ay /= 0) then Just $ fromRational $ round ((atan2 ay ax)*1000000*180/pi)%1000000 else Nothing
        in return (DefaultPlayer keys aimx aimy False, angle, move, aangle, shoot)
    
    handleEvent (DefaultPlayer keys aimx aimy shoot) ev
        | Just (KeyPressEvent key)    <- fromEvent ev = DefaultPlayer (S.insert key keys) aimx aimy shoot
        | Just (KeyReleaseEvent key)  <- fromEvent ev = DefaultPlayer (S.delete key keys) aimx aimy shoot
        | Just (MouseMotionEvent x y) <- fromEvent ev = DefaultPlayer keys x y shoot
        | Just (MousePressEvent x y) <- fromEvent ev = DefaultPlayer keys x y True
        | otherwise = DefaultPlayer keys aimx aimy shoot
    
    renderPlayer (DefaultPlayer _ aimx aimy _) = unsafePreservingMatrix $ do
                                                   translate $ Vector3 (realToFrac aimx) (realToFrac aimy) (0.2 :: GLfloat)
                                                   rotate 30 $ Vector3 1 0 (0 :: GLfloat)
                                                   
                                                   unsafeRenderPrimitive Quads $ do
                                                                            texCoord $ TexCoord2 (0 :: GLfloat) (0 :: GLfloat)
                                                                            vertex $ Vertex2 (-0.2 :: GLfloat) (-0.2 :: GLfloat)
                                                                            
                                                                            texCoord $ TexCoord2 (0 :: GLfloat) (1 :: GLfloat)
                                                                            vertex $ Vertex2 (-0.2 :: GLfloat) (0.2 :: GLfloat)
                                                                            
                                                                            texCoord $ TexCoord2 (1 :: GLfloat) (1 :: GLfloat)
                                                                            vertex $ Vertex2 (0.2 :: GLfloat) (0.2 :: GLfloat)
                                                                            
                                                                            texCoord $ TexCoord2 (1 :: GLfloat) (0 :: GLfloat)
                                                                            vertex $ Vertex2 (0.2 :: GLfloat) (-0.2 :: GLfloat)