{-# OPTIONS -XBangPatterns #-}

module Main where

import Prelude hiding (concat, filter)

import Data.Alpino.Model.Enumerator
import Data.Enumerator hiding (isEOF, length)
import Data.List (genericLength)
import Text.Printf (printf)

sumCount :: (Monad m, Fractional a, Integral b) => Iteratee a m (a, b)
sumCount = continue $ step (0.0, 0)
    where step acc (Chunks []) = continue $ step acc
          step (!sumAcc, !lenAcc) (Chunks xs) =
              continue $ step (sumAcc + sum xs, lenAcc + genericLength xs)
          step acc EOF = yield acc EOF

main :: IO ()
main = do
  (scoreSum, scoreLen) <- run_ $ lineEnum $$ joinI $ instanceParser $$
                          joinI $ groupByKey $$
                          joinI $ bestScore $$ sumCount
  putStrLn $ "Contexts: " ++ (show scoreLen)
  putStrLn $ "Oracle: " ++ (printf("%.4f") $ scoreSum / fromIntegral scoreLen)