{-# LANGUAGE OverloadedStrings #-}
module Main where

import Lib
import QuoteSource.DataImport
import Control.Concurrent hiding (readChan)
import Control.Monad
import Control.Monad.IO.Class
import Data.IORef
import Graphics.UI.Gtk hiding (Action, backspace)
import Control.Concurrent.BoundedChan
import Data.ATrade
import QuoteSource.TableParsers.AllParamsTableParser
import QuoteSource.TableParser
import QuoteSource.Server

import Broker
import Broker.PaperBroker

import System.Log.Logger
import System.Log.Handler.Simple
import System.Log.Handler (setFormatter)
import System.Log.Formatter
import System.ZMQ4

import Data.Aeson
import Data.Aeson.Types
import qualified Data.ByteString.Lazy as BL
import qualified Data.HashMap.Strict as HM
import qualified Data.Vector as V
import qualified Data.Text as T

data TableConfig = TableConfig {
  parserId :: String,
  tableName :: String,
  tableParams :: Value
} deriving (Show)

data Config = Config {
  quotesourceEndpoint :: String,
  brokerserverEndpoint :: String,
  tables :: [TableConfig]
} deriving (Show)

readConfig :: String -> IO Config
readConfig fname = do
  content <- BL.readFile fname
  case decode content >>= parseMaybe parseConfig of
    Just config -> return config
    Nothing -> error "Unable to load config"

parseConfig :: Value -> Parser Config
parseConfig = withObject "object" $ \obj -> do
  qse <- obj .: "quotesource-endpoint"
  bse <- obj .: "brokerserver-endpoint"
  rt <- case HM.lookup "tables" obj of
    Just v -> parseTables v
    Nothing -> fail "Expected tables array"
  return Config { quotesourceEndpoint = qse,
    brokerserverEndpoint = bse,
    tables = rt }
  where
    parseTables :: Value -> Parser [TableConfig]
    parseTables = withArray "array" $ \arr -> mapM parseTableConfig (V.toList arr)

    parseTableConfig :: Value -> Parser TableConfig
    parseTableConfig = withObject "object" $ \obj -> do
      pid <- obj .: "parser-id"
      tn <- obj .: "table-name"
      params <- case HM.lookup "params" obj of
        Just x -> return x
        Nothing -> return $ Object HM.empty
      return TableConfig {
        parserId = pid,
        tableName = tn,
        tableParams = params }

forkBoundedChan :: Int -> Int -> BoundedChan a -> IO (ThreadId, [BoundedChan a])
forkBoundedChan chans size source = do
  sinks <- replicateM chans (newBoundedChan size)
  tid <- forkIO $ forever $ do
    v <- readChan source
    mapM_ (`tryWriteChan` v) sinks

  return (tid, sinks)


main :: IO ()
main = do
  updateGlobalLogger rootLoggerName (setLevel DEBUG)
  infoM "main" "Loading config"
  config <- readConfig "quik-connector.config.json"
  infoM "main" "Config loaded"
  chan <- newBoundedChan 1000
  infoM "main" "Starting data import server"
  dis <- initDataImportServer [MkTableParser $ mkAllParamsTableParser "allparams"] chan "atrade"

  (forkId, [c1, c2]) <- forkBoundedChan 2 1000 chan

  broker <- mkPaperBroker c2 1000000 ["demo"]
  withContext (\ctx -> do
    qsServer <- startQuoteSourceServer c1 ctx (quotesourceEndpoint config)

    void initGUI
    window <- windowNew
    window `on` deleteEvent $ do
      liftIO mainQuit
      return False
    widgetShowAll window
    mainGUI
    stopQuoteSourceServer qsServer
    infoM "main" "Main thread done")
  killThread forkId