{-# LANGUAGE CPP #-}
{-# LANGUAGE MagicHash #-}

module System.Tracy
  ( withProfiler
  , connected
  , waitConnected
  , waitConnected_

  , setThreadName
  , appInfo

  , Zone.withSrcLoc_

  , frameMark
  , frameMark_
  , frameMarkStart
  , frameMarkEnd

  , message
  , messageC
  , messageL
  , messageLC

  , plot
  , plotFloat
  , plotInt
  , plotIntegral
  , plotConfig
  , PlotFormat(..)

#ifdef TRACY_FIBERS
  , fiberEnter
  , fiberLeave
#endif

  , Color
  ) where

import Control.Concurrent (threadDelay)
import Control.Monad (void)
import Control.Monad.IO.Class (MonadIO(..))
import Data.Maybe (fromMaybe)
import Data.Text (Text)
import Data.Text.Foreign qualified as Text
import Foreign (nullPtr)
import Foreign.C.ConstPtr (ConstPtr(..))
import GHC.Exts (Ptr(..), Addr#)
import System.Timeout (timeout)

import System.Tracy.FFI qualified as FFI
import System.Tracy.FFI.Types (Color, PlotFormat(..))
import System.Tracy.Zone qualified as Zone

#if defined(TRACY_ENABLE) && defined(TRACY_MANUAL_LIFETIME)
import Control.Exception (bracket_)
#endif

{- | Start/stop profiler when TRACY_MANUAL_LIFETIME is enabled.
Otherwise does nothing.
-}
withProfiler :: IO a -> IO a
withProfiler action =
#if defined(TRACY_ENABLE) && defined(TRACY_MANUAL_LIFETIME)
  bracket_ FFI.startupProfiler FFI.shutdownProfiler action
#else
  action
#endif

{- | Check whether the profiler is connected.
-}
connected :: IO Bool
#if defined(TRACY_ENABLE)
connected = (/= 0) <$> FFI.connected
#else
connected = pure False
#endif

{- | Poll connection status repeatedly until the profiler is connected or the time is up.

Immediately returns False when Tracy is not enabled.
-}
waitConnected
  :: MonadIO m
  => Int       -- ^ Poll interval
  -> Maybe Int -- ^ Maximum waiting time
  -> m Bool
#if defined(TRACY_ENABLE)
waitConnected interval mtimeout =
  liftIO $
    case mtimeout of
      Nothing -> go
      Just t -> fromMaybe False <$> timeout t go
  where
    go = do
      conn <- connected
      if conn then
        pure True
      else
        threadDelay interval >> go
#else
waitConnected _interval _timeout = pure False -- XXX: ignore indefinite waiting
#endif

{- | Wait indefinitely until the profiler connects.

Useful for tests, benches, and other short-lifetime scripts.
-}
waitConnected_ :: IO ()
waitConnected_ = void $ waitConnected 100000 Nothing

setThreadName :: Addr# -> IO ()
#if defined(TRACY_ENABLE)
setThreadName name = FFI.setThreadName (ConstPtr (Ptr name))
#else
setThreadName _name = pure ()
#endif

{-# INLINE frameMark_ #-}
frameMark_ :: MonadIO m => m ()
#if defined(TRACY_ENABLE)
frameMark_ = liftIO $ FFI.emitFrameMark (ConstPtr nullPtr)
#else
frameMark_ = pure ()
#endif

{-# INLINE frameMark #-}
frameMark :: MonadIO m => Addr# -> m ()
#if defined(TRACY_ENABLE)
frameMark name = liftIO $ FFI.emitFrameMark (ConstPtr $ Ptr name)
#else
frameMark _name = pure ()
#endif

{-# INLINE frameMarkStart #-}
frameMarkStart :: MonadIO m => Addr# -> m ()
#if defined(TRACY_ENABLE)
frameMarkStart name = liftIO $ FFI.emitFrameMarkStart (ConstPtr $ Ptr name)
#else
frameMarkStart = pure ()
#endif

{-# INLINE frameMarkEnd #-}
frameMarkEnd :: MonadIO m => Addr# -> m ()
#if defined(TRACY_ENABLE)
frameMarkEnd name = liftIO $ FFI.emitFrameMarkEnd (ConstPtr $ Ptr name)
#else
frameMarkEnd = pure ()
#endif

-- TODO: nicer wrapper for emitFrameImage

{-# INLINE message #-}
message :: MonadIO m => Text -> m ()
#if defined(TRACY_ENABLE)
message txt = liftIO $
  Text.withCStringLen txt \(txtPtr, txtSz) ->
    FFI.emitMessage (ConstPtr txtPtr) (fromIntegral txtSz) 0
#else
message _txt = pure ()
#endif

{-# INLINE messageC #-}
messageC :: MonadIO m => Color -> Text -> m ()
#if defined(TRACY_ENABLE)
messageC color txt = liftIO $
  Text.withCStringLen txt \(txtPtr, txtSz) ->
    FFI.emitMessageC (ConstPtr txtPtr) (fromIntegral txtSz) color 0
#else
messageC _txt = pure ()
#endif


{-# INLINE messageL #-}
messageL :: MonadIO m => Addr# -> m ()
#if defined(TRACY_ENABLE)
messageL txt = liftIO $
  FFI.emitMessageL (ConstPtr (Ptr txt)) 0
#else
messageL _txt = pure ()
#endif

{-# INLINE messageLC #-}
messageLC :: MonadIO m => Color -> Addr# -> m ()
#if defined(TRACY_ENABLE)
messageLC color txt = liftIO $
  FFI.emitMessageLC (ConstPtr (Ptr txt)) color 0
#else
messageLC _color _txt = pure ()
#endif

{-# INLINE plot #-}
plot :: MonadIO m => Addr# -> Double -> m ()
#if defined(TRACY_ENABLE)
plot name val = liftIO $
  FFI.emitPlot (ConstPtr (Ptr name)) val
#else
plot _name = pure ()
#endif

{-# INLINE plotFloat #-}
plotFloat :: MonadIO m => Addr# -> Float -> m ()
#if defined(TRACY_ENABLE)
plotFloat name val = liftIO $
  FFI.emitPlotFloat (ConstPtr (Ptr name)) val
#else
plotFloat _name = pure ()
#endif

{-# INLINE plotInt #-}
plotInt :: MonadIO m => Addr# -> Int -> m ()
plotInt = plotIntegral

{-# INLINE plotIntegral #-}
plotIntegral :: (Integral a, MonadIO m) => Addr# -> a -> m ()
#if defined(TRACY_ENABLE)
plotIntegral name val = liftIO $
  FFI.emitPlotInt (ConstPtr (Ptr name)) (fromIntegral val)
#else
plotIntegral _name = pure ()
#endif

{-# INLINE plotConfig #-}
plotConfig
  :: MonadIO m
  => Addr#
  -> PlotFormat
  -> Bool -- ^ Step
  -> Bool -- ^ Fill
  -> Color
  -> m ()
#if defined(TRACY_ENABLE)
plotConfig name pf step fill col = liftIO $
  FFI.emitPlotConfig
    (ConstPtr (Ptr name))
    (fromIntegral $ fromEnum pf)
    (fromIntegral $ fromEnum step)
    (fromIntegral $ fromEnum fill)
    col
#else
plotConfig _name _typ _step _fill _col = pure ()
#endif

{- | Record additional information about the profiled application,
  which will be available in the trace description.

  This can include data such as the source repository revision, the
  application's environment (dev/prod), etc.
-}
{-# INLINE appInfo #-}
appInfo :: MonadIO m => Text -> m ()
#if defined(TRACY_ENABLE)
appInfo txt = liftIO $
  Text.withCStringLen txt \(txtPtr, txtSz) ->
    FFI.emitMessageAppinfo (ConstPtr txtPtr) (fromIntegral txtSz)
#else
appInfo _txt = pure ()
#endif

#ifdef TRACY_FIBERS
{-# INLINE fiberEnter #-}
fiberEnter :: MonadIO m => Addr# -> m ()
#if defined(TRACY_ENABLE)
fiberEnter name = liftIO $
  FFI.fiberEnter (ConstPtr (Ptr name))
#else
fiberEnter _name = pure ()
#endif

{-# INLINE fiberLeave #-}
fiberLeave :: MonadIO m => m ()
#if defined(TRACY_ENABLE)
fiberLeave name val = liftIO $
  FFI.fiberLeave
#else
fiberLeave = pure ()
#endif
#endif