module Csound.Typed.GlobalState.Options (
    Options(..),
    defGain, defSampleRate, defBlockSize, defTabFi,
    -- * Table fidelity
    TabFi(..), fineFi, coarseFi,
    -- ** Gen identifiers
    -- | Low level Csound integer identifiers for tables. These names can be used in the function 'Csound.Base.fineFi'
    -- *** Integer identifiers
    idWavs, idMp3s, idDoubles, idSines, idSines3, idSines2,
    idPartials, idSines4, idBuzzes, idConsts, idLins, idCubes,
    idExps, idSplines, idStartEnds,  idPolys, idChebs1, idChebs2, idBessels, idWins,
    -- *** String identifiers
    idPadsynth, idTanh, idExp, idSone, idFarey, idWave
) where

import Control.Applicative
import Data.Default

import qualified Data.IntMap as IM
import qualified Data.Map    as M

import Csound.Dynamic hiding (csdFlags)

-- | Csound options. The default values are
--
-- > flags      = def     -- the only flag set by default is "no-displays" 
-- >                      -- to supress the display of the tables
-- > sampleRate = 44100
-- > blockSize  = 64
-- > gain       = 0.5
-- > tabFi      = fineFi 13 [(idLins, 11), (idExps, 11), (idConsts, 9), (idSplines, 11), (idStartEnds, 12)] }
data Options = Options 
    { csdFlags          :: Flags        -- ^ Csound command line flags
    , csdSampleRate     :: Maybe Int          -- ^ The sample rate
    , csdBlockSize      :: Maybe Int          -- ^ The number of audio samples in one control step
    , csdGain           :: Maybe Double       -- ^ A gain of the final output
    , csdTabFi          :: Maybe TabFi        -- ^ Default fidelity of the arrays   
    }
   
instance Default Options where
    def = Options def def def def def

instance Monoid Options where
    mempty = def
    mappend a b = Options
        { csdFlags          = mappend (csdFlags a) (csdFlags b)
        , csdSampleRate     = csdSampleRate a <|> csdSampleRate b
        , csdBlockSize      = csdBlockSize a <|> csdBlockSize b
        , csdGain           = csdGain a <|> csdGain b
        , csdTabFi          = csdTabFi a <|> csdTabFi b }

defGain :: Options -> Double
defGain = maybe 0.8 id . csdGain

defSampleRate :: Options -> Int
defSampleRate = maybe 44100 id . csdSampleRate

defBlockSize :: Options -> Int
defBlockSize = maybe 64 id . csdBlockSize

defTabFi :: Options -> TabFi
defTabFi = maybe def id . csdTabFi
    
-- | Table size fidelity (how many points in the table by default).
data TabFi = TabFi
    { tabFiBase   :: Int
    , tabFiGens   :: IM.IntMap Int
    , tabNamedFiGens :: M.Map String Int }

instance Default TabFi where
    def = fineFi 13 
                [(idLins, 11), (idExps, 11), (idConsts, 9), (idSplines, 11), (idStartEnds, 12)] 
                [(idPadsynth, 18), (idSone, 14), (idTanh, 13), (idExp, 13)]
        

-- | Sets different table size for different GEN-routines. 
--
-- > fineFi n ps 
--
-- where 
-- 
-- * @n@ is the default value for table size (size is a @n@ power of 2) for all gen routines that are not listed in the next argument @ps@.
--
-- * @ps@ is a list of pairs @(genRoutineId, tableSizeDegreeOf2)@ that sets the given table size for a 
--   given GEN-routine.
--
-- with this function we can set lower table sizes for tables that are usually used in the envelopes.
fineFi :: Int -> [(Int, Int)] -> [(String, Int)] -> TabFi
fineFi n xs ys = TabFi n (IM.fromList xs) (M.fromList ys)

-- | Sets the same table size for all tables. 
--
-- > coarseFi n
--
-- where @n@  is a degree of 2. For example, @n = 10@ sets size to 1024 points for all tables by default.
coarseFi :: Int -> TabFi
coarseFi n = TabFi n IM.empty M.empty

idWavs, idMp3s, idDoubles, idSines, idSines3, idSines2,
    idPartials, idSines4, idBuzzes, idConsts, idLins, idCubes,
    idExps, idSplines, idStartEnds,  idPolys, idChebs1, idChebs2, idBessels, idWins :: Int


-- Human readable Csound identifiers for GEN-routines

idWavs = 1
idDoubles = 2
idSines = 10
idSines3 = 9
idSines2 = 9
idPartials = 9
idSines4 = 19
idBuzzes = 11
idConsts = 17
idLins = 7
idCubes = 6
idExps = 5
idStartEnds = 16
idSplines = 8 
idPolys = 3
idChebs1 = 13
idChebs2 = 14
idBessels = 12
idWins = 20
idMp3s = 49

-- Identifiers for named GEN-routines

idPadsynth, idTanh, idExp, idSone, idFarey, idWave :: String

idPadsynth = "padsynth"
idTanh     = "tanh"
idExp      = "exp"
idSone     = "sone"
idFarey    = "farey"
idWave     = "wave"