-- |
-- Copyright : (C) 2013 Parallel Scientific Labs, LLC.
-- License   : GPLv2
--
-- Testing GraphHammer analyses.

{-# LANGUAGE PatternGuards #-}

module Main(main) where

import Control.Monad
import Control.Monad.State
import Data.Array
import Data.Array.IO
import Data.Array.Unboxed
import Data.Bits
import Data.IORef
import Data.List
import Data.Word
import System.Environment
import System.Exit
import System.IO

import qualified G500 as G500
import qualified G500.Read as GR

import GraphHammer
import GraphHammer.TriangleCount

import RectangleGraphGenerator
import OneToOneGraphGenerator

-------------------------------------------------------------------------------
-- Configuration parameters.

-------------------------------------------------------------------------------
-- Generating test data.

testDataReading :: String -> Int -> IO (Integer, (IO (Maybe (UArray Int Index))))
testDataReading fname batchSize = do
	h <- openBinaryFile fname ReadMode
	nEdges <- computeEdgesCount h
	gen <- GR.mkGraph500Reader h batchSize
	return (computeBatchThreshold nEdges, gen)
	where
		-- !!!HACKHACK!!!
		-- it thinks we always will use Int64 for vertex index.
		computeEdgesCount handle = do
			sz <- hFileSize handle
			return $ sz `div` (8*2)
		computeBatchThreshold nEdges = threshold - threshold `mod` fromIntegral batchSize
			where
				threshold = nEdges - 80000

-------------------------------------------------------------------------------
-- Reading the arguments.

data GHammerArgs = GArgs {
	  saBatchSize		:: Int
	, saNodes		:: Int
	, saProcesses		:: Int
	}

readArguments :: IO (String, GHammerArgs)
readArguments = do
	args <- getArgs
	putStrLn $ "Arguments: "++show args
	case runStateT parseArgs args of
		Nothing -> do
			putStrLn $ unlines [
				  "usage: TriangleCountTest -fname=<filename> [gHammer arguments]"
				, "gHammer arguments are:"
				, "    -batch=<batch size>, default 1000"
				, "    -nodes=<nodes count>, default 1"
				, "    -processes=<processes per node>, default 1"
				, "As gHammer arguments all have defaults, they can be omitted."
				, "Default values will make GraphHammer work sequentially."
				]
			exitFailure
		Just (result,_) -> return result
	where

matchOpt :: String -> StateT [String] Maybe (Maybe String)
matchOpt opt = do
	(('-':a):as) <- get
	put as
	mplus (do
			"" <- lift $ stripPrefix opt a
			return Nothing)
		(liftM Just (lift $ stripPrefix (opt++"=") a))
intOpt opt = do
	Just v <- matchOpt opt
	case reads v of
		[(i,"")] -> return i
		_ -> mzero
intDefOpt def opt = intOpt opt `mplus` return def

speedMeasurementArgs = do
	sa <- gHammerArgs
	[] <- get
	return sa

filenameOpt = do
	Just fn <- matchOpt "fname"
	return fn

parseArgs = do
	liftM2 (,) filenameOpt speedMeasurementArgs

gHammerArgs = do
	parseOpts $ GArgs 1000 1 1
	where
		parseOpts sa = do
				sa' <- batch sa `mplus` nodes sa `mplus` processes sa
				parseOpts sa'
			`mplus` return sa
		batch sa = do
			b <- intOpt "batch"
			return $ sa { saBatchSize = b }
		nodes sa = do
			n <- intOpt "nodes"
			return $ sa { saNodes = n }
		processes sa = do
			p <- intOpt "processes"
			return $ sa { saProcesses = p }

-------------------------------------------------------------------------------
-- Running the test.

main = do
	(fn, gHammerArgs) <- readArguments
	(threshold, gen) <- testDataReading fn (saBatchSize gHammerArgs)
	let maxNodes = saNodes gHammerArgs
	runAnalysesStack threshold maxNodes gen triangleCount