module Main where

import Data.ByteString.Lazy (toStrict)
import Data.ByteString.Builder (toLazyByteString)
import Data.ByteString (ByteString)
import Data.Vector as V(fromList, empty)
import Data.IORef
import Control.Concurrent
import Control.Applicative
import Control.Monad
import Data.Monoid

import Database.PostgreSQL.Protocol.Types
import Database.PostgreSQL.Protocol.Encoders
import Database.PostgreSQL.Driver
import Criterion.Main

main = benchMultiPw

benchRequests :: IO c -> (c -> IO a) -> IO ()
benchRequests connectAction queryAction = do
    rs <- replicateM 8 newThread
    threadDelay 10000000
    traverse (killThread . snd) rs
    s <- sum <$> traverse (readIORef . fst) rs
    print $ "Requests: " ++ show s
  where
    newThread  = do
        ref <- newIORef 0 :: IO (IORef Word)
        c <- connectAction
        tid <- forkIO $ forever $ do
            queryAction c
            modifyIORef' ref (+1)
        pure (ref, tid)

benchMultiPw :: IO ()
benchMultiPw = benchRequests createConnection $ \c -> do
            sendBatchAndSync c [q, q, q, q, q, q, q, q, q, q]
            readNextData c
            readNextData c
            readNextData c
            readNextData c
            readNextData c
            readNextData c
            readNextData c
            readNextData c
            readNextData c
            readNextData c
            waitReadyForQuery c
  where
    q = Query largeStmt V.empty Binary Binary AlwaysCache
    largeStmt = "select typname, typnamespace, typowner, typlen, typbyval,"
                <> "typcategory, typispreferred, typisdefined, typdelim,"
                <> "typrelid, typelem, typarray from pg_type "

-- Connection
-- | Creates connection with default filter.
createConnection :: IO Connection
createConnection = getConnection <$> connect defaultSettings

getConnection :: Either Error Connection -> Connection
getConnection (Left e) = error $ "Connection error " ++ show e
getConnection (Right c) = c

defaultSettings = defaultConnectionSettings
    { settingsHost     = "localhost"
    , settingsDatabase = "travis_test"
    , settingsUser     = "postgres"
    , settingsPassword = ""
    }