module Material where

-- import Data.Vect
-- import Data.String (String)
-- import qualified Data.String.Char8 as SB

identityLight :: Float
identityLight = 1

data Entity
    = Entity
    { eAmbientLight     :: Vec 4 Float
    , eDirectedLight    :: Vec 4 Float
    , eLightDir         :: Vec 3 Float
    , eShaderRGBA       :: Vec 4 Float
    }

data WaveType
    = WT_Sin
    | WT_Triangle
    | WT_Square
    | WT_Sawtooth
    | WT_InverseSawtooth
    | WT_Noise
    --deriving Show

data Wave = Wave WaveType Float Float Float Float -- deriving Show

data Deform
    = D_AutoSprite
    | D_AutoSprite2
    | D_Bulge Float Float Float
    | D_Move (Vec 3 Float) Wave
    | D_Normal Float Float
    | D_ProjectionShadow
    | D_Text0
    | D_Text1
    | D_Text2
    | D_Text3
    | D_Text4
    | D_Text5
    | D_Text6
    | D_Text7
    | D_Wave Float Wave
    -- deriving Show

data CullType
    = CT_FrontSided
    | CT_BackSided
    | CT_TwoSided
    -- deriving Show

data Blending'
    = B_DstAlpha
    | B_DstColor
    | B_One
    | B_OneMinusDstAlpha
    | B_OneMinusDstColor
    | B_OneMinusSrcAlpha
    | B_OneMinusSrcColor
    | B_SrcAlpha
    | B_SrcAlphaSaturate
    | B_SrcColor
    | B_Zero
    -- deriving (Show, Eq)

data RGBGen
    = RGB_Wave Wave
    | RGB_Const Float Float Float
    | RGB_Identity
    | RGB_IdentityLighting
    | RGB_Entity
    | RGB_OneMinusEntity
    | RGB_ExactVertex
    | RGB_Vertex
    | RGB_LightingDiffuse
    | RGB_OneMinusVertex
    | RGB_Undefined
    -- deriving Show

data AlphaGen
    = A_Wave Wave
    | A_Const Float
    | A_Portal
    | A_Identity
    | A_Entity
    | A_OneMinusEntity
    | A_Vertex
    | A_LightingSpecular
    | A_OneMinusVertex
    -- deriving Show

data TCGen
    = TG_Base
    | TG_Lightmap
    | TG_Environment -- TODO, check: RB_CalcEnvironmentTexCoords
    | TG_Vector (Vec 3 Float) (Vec 3 Float)
    | TG_Undefined  -- FIXME: HACK!!
    -- deriving Show

data TCMod
    = TM_EntityTranslate
    | TM_Rotate Float
    | TM_Scroll Float Float
    | TM_Scale Float Float
    | TM_Stretch Wave
    | TM_Transform Float Float Float Float Float Float
    | TM_Turb Float Float Float Float
    -- deriving Show

data StageTexture
    = ST_Map        String
    | ST_ClampMap   String
    | ST_AnimMap    Float [String]
    | ST_Lightmap
    | ST_WhiteImage
    -- deriving (Show, Eq, Ord)

data AlphaFunction
    = A_Gt0
    | A_Lt128
    | A_Ge128
    -- deriving (Show, Eq, Ord)

data DepthFunction
    = D_Equal
    | D_Lequal
    -- deriving Show

data StageAttrs
    = StageAttrs
    { saBlend       :: (Maybe (Blending', Blending'))
    , saRGBGen      :: RGBGen
    , saAlphaGen    :: AlphaGen
    , saTCGen       :: TCGen
    , saTCMod       :: [TCMod]
    , saTexture     :: StageTexture
    , saDepthWrite  :: Bool
    , saDepthFunc   :: DepthFunction
    , saAlphaFunc   :: (Maybe AlphaFunction)

    -- parser internals
    , saDepthMaskExplicit   :: Bool
    , saTextureUniform  :: String
    }
    -- deriving Show

defaultStageAttrs :: StageAttrs
defaultStageAttrs = StageAttrs
    { saBlend       = Nothing
    , saRGBGen      = RGB_Undefined
    , saAlphaGen    = A_Identity
    , saTCGen       = TG_Undefined
    , saTCMod       = []
    , saTexture     = ST_WhiteImage
    , saDepthWrite  = True
    , saDepthFunc   = D_Lequal
    , saAlphaFunc   = Nothing
    , saDepthMaskExplicit   = False
    , saTextureUniform  = ""
    }

data CommonAttrs
    = CommonAttrs
    { caSkyParms        :: () -- TODO
    , caFogParms        :: () -- TODO
    , caPortal          :: Bool
    , caSort            :: Float -- default: 3 or 6 depends on blend function
    , caEntityMergable  :: Bool
    , caFogOnly         :: Bool
    , caCull            :: CullType -- default: front
    , caDeformVertexes  :: [Deform]
    , caNoMipMaps       :: Bool
    , caPolygonOffset   :: Bool
    , caStages          :: [StageAttrs]

    -- parser internals
    , caIsSky           :: Bool
    }
    -- deriving Show

defaultCommonAttrs :: CommonAttrs
defaultCommonAttrs = CommonAttrs
    { caSkyParms        = ()
    , caFogParms        = ()
    , caPortal          = False
    , caSort            = 0
    , caEntityMergable  = False
    , caFogOnly         = False
    , caCull            = CT_FrontSided
    , caDeformVertexes  = []
    , caNoMipMaps       = False
    , caPolygonOffset   = False
    , caStages          = []
    , caIsSky           = False
    }