module PMInstance where
import Data.Array.IArray
import Data.Array.Unboxed
import ArrayStuff
import Formatter

type Wt = Double -- Can be any RealFrac.
widenInteger x = fromInteger (toInteger x)

data PMInstance = PMInstance {
	-- I feel like I am in C, having to namespace these!  I guess one
	-- solution would be to have a typeclass for every field name.  A
	-- specialized solution might desugar to that.
	pmiNumReviewers :: Int,
	pmiNumProposals :: Int,
	pmiRLoad :: UArray Int Wt,
	pmiRPPref :: UArray (Int, Int) Wt, -- preference: -100 (COI), -99 to 100
	pmiRPExp :: UArray (Int, Int) Wt, -- expertise: 0 to 3
	-- New 2011-07-19
	-- Should we "jam" all three values that are functions of (i, j)/
	pmiRPFix :: UArray (Int, Int) Bool,
	pmiPNumReviews :: UArray Int Int
}

-- Let us shoehorn in the new pref scale.
prefOldToNew p' = 100 - 5 * p'
prefNewToOld p = 20 - 0.2 * p

instance Show PMInstance where
	show pmi =
		let theRvrs = [0..pmiNumReviewers pmi - 1]; theProps = [0..pmiNumProposals pmi - 1] in
		"Instance with " ++ show (pmiNumReviewers pmi) ++ " reviewers and " ++ show (pmiNumProposals pmi) ++ " proposals:\n" ++ formatTable (
			    (       ""              : map (\i -> "R#" ++ show i       ) theRvrs) :
			    (       "RLoad"         : map (\i -> show (pmiRLoad pmi ! i)     ) theRvrs) :
			map (\j -> ("P#" ++ show j) : map (\i -> show (pmiRPPref pmi ! (i, j)) ++ ":" ++ show (pmiRPExp pmi ! (i, j))) theRvrs) theProps
		)

newtype PMatching = PMatching [(Int, Int)]
	deriving Show