From f3e509381908a4a1444a205734b00ab13e3316f7 Mon Sep 17 00:00:00 2001
From: Igor Pashev <pashev.igor@gmail.com>
Date: Tue, 27 Jun 2017 06:50:32 +0300
Subject: Implement manyToMany with manyToOne

---
 lib/Malodivo/Budget.hs | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/lib/Malodivo/Budget.hs b/lib/Malodivo/Budget.hs
index 935f86c..3a68fdf 100644
--- a/lib/Malodivo/Budget.hs
+++ b/lib/Malodivo/Budget.hs
@@ -172,7 +172,9 @@ manyToOne ::
      D.DistrictFunds -- ^ Amounts of available funds per district.
   -> B.Bill -- ^ A bill requiring funding.
   -> D.DistrictFunds -- ^ Contribution of each district.
-manyToOne df b = fundRaising (B.amount b) df
+manyToOne df b = HM.fromList $ zip ds (normalizeDown (B.amount b) fs)
+  where
+    (ds, fs) = unzip $ HM.toList df
 
 {-|
 Districts funding multiple bills. No constraints.
@@ -183,9 +185,8 @@ manyToMany ::
   -> [(B.Bill, D.DistrictFunds)] -- ^ Contribution of each district to each bill.
 manyToMany funds bills = zipWith (\b df -> (b, df)) bills allocated
   where
-    billAmounts = B.amount <$> bills
     fundsTotal = sum $ HM.elems funds
-    allocated = flip fundRaising funds <$> normalizeDown fundsTotal billAmounts
+    allocated = manyToOne funds <$> normalizeBills fundsTotal bills
 
 {-|
 Districts funding multiple bills. But each ministry may have been limited
@@ -241,12 +242,3 @@ manyToManyLimited df ml bills = manyToMany df . concat $ HM.elems byMinistry'
       case HM.lookup m ml of
         Nothing -> bs
         Just l -> normalizeBills l bs
-
--- | Helper function to maintain DRY and backward compatibility.
-fundRaising ::
-     Integer -- ^ Amount to be raised.
-  -> D.DistrictFunds -- ^ Amounts of available funds per district.
-  -> D.DistrictFunds -- ^ Contribution of each district.
-fundRaising needed df = HM.fromList $ zip ds (normalizeDown needed fs)
-  where
-    (ds, fs) = unzip $ HM.toList df
-- 
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