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profit calculation works, but is O(n²)

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Nicole Dresselhaus 2015-08-07 02:10:42 +02:00
parent 49adc39c2d
commit 617e225624
1 changed files with 40 additions and 0 deletions
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40
Handler/Update.hs
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@ -8,6 +8,7 @@ import qualified Eve.Api.Types as T
import qualified Eve.Api.Char.Standings as ST
import qualified Eve.Api.Char.Skills as SK
import Database.Persist.Sql
import qualified Debug.Trace as Debug
accountingId :: Int64
accountingId = 16622
@ -57,6 +58,7 @@ getUpdateR = loginOrDo (\(uid,user) -> do
update uid [UserWalletTimeout =. time']
insertMany_ (migrateTransaction uid <$> trans')
_ -> return ()
-- update taxes
let sql = "update transaction t \
set \
fee = 100*(quantity*(price_cents/100)*(0.0100-0.0005*ch.br)/exp(0.1000*COALESCE((select faction_standing from faction_standings where faction_id=c.\"factionID\" and \"user\"=t.\"user\"),0)+0.0400*COALESCE((select corp_standing from corp_standings where corp_id=c.\"corporationID\" and \"user\"=t.\"user\"),0))), \
@ -72,9 +74,47 @@ getUpdateR = loginOrDo (\(uid,user) -> do
t.no_tax = false and \
t.user=?"
runDB $ rawExecute sql [toPersistValue uid]
-- calculate profits
runDB $ do
trans <- updateProfits <$> selectList [TransactionUser ==. uid, TransactionInStock !=. 0] [Asc TransactionDateTime]
mapM_ (\(Entity eid t) -> replace eid t) trans
redirect WalletR
)
updateProfits :: [Entity Transaction] -> [Entity Transaction]
updateProfits [] = []
updateProfits dat = updateProfits' [] dat
where
updateProfits' seen (x@(Entity _ tx):xs) = if transactionTransIsSell tx then
let (x',xs') = updateProfits'' x seen
updateProfits'' :: Entity Transaction -> [Entity Transaction] -> (Entity Transaction, [Entity Transaction])
updateProfits'' o [] = (o,[])
updateProfits'' o@(Entity et t) ((Entity cet ct):ts) =
if transactionTypeId t == transactionTypeId ct
&& transactionInStock ct > 0
&& transactionInStock t < 0 then
let m = min (transactionInStock t * (-1)) (transactionInStock ct)
t' = t {transactionInStock = transactionInStock t + m}
ct' = ct {transactionInStock = transactionInStock ct - m}
prof' = (transactionPriceCents t - transactionPriceCents ct) * m
(t'',ct'') = if prof' > 0 then
Debug.trace ("Item "++show (transactionTypeId t)++" has profit "++show prof'++" ("++show (transactionPriceCents t)++" - "++show (transactionPriceCents ct)++")*"++show m)
$ updateProfits'' (Entity et (t' { transactionProfit = maybe (Just prof') (\a -> Just (a + prof')) (transactionProfit t')})) ts
else
updateProfits'' (Entity et (t' { transactionProfit = maybe (Just prof') (\a -> Just (a + prof')) (transactionProfit t')})) ts
in
(t'' ,(Entity cet ct'):ct'')
else
let
(t'',ct'') = updateProfits'' o ts
in
(t'',(Entity cet ct):ct'')
in
updateProfits' (xs'++[x']) xs
else
updateProfits' (seen++[x]) xs
updateProfits' seen [] = seen
findLvl :: Int64 -> [SK.Skill] -> Int
findLvl sid skills = case find (\(SK.Skill sid' _ _ _) -> sid' == sid) skills of
Just (SK.Skill _ _ lvl _) -> lvl