yammat/Handler/Journal.hs

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module Handler.Journal where
import Import as I
import Data.List as L
import Handler.Common
getJournalR :: Handler Html
getJournalR = do
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master <- getYesod
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rawEntries <- runDB $ selectList [] [Desc TransactionId]
entries <- return $ L.reverse $ L.take 30 rawEntries
total <- return $ L.sum $ I.map (transactionAmount . entityVal) rawEntries
timeLimit <- case L.null entries of
False -> return $ transactionTime $ entityVal $ L.head $ entries
True -> liftIO getCurrentTime
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cashChecks <- runDB $ selectList [CashCheckTime >=. timeLimit] [Asc CashCheckId]
list <- return $ merge entries cashChecks
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cashBalance <- getCashierBalance
defaultLayout $ do
$(widgetFile "journal")
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merge :: [Entity Transaction] -> [Entity CashCheck] -> [Either Transaction CashCheck]
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merge [] [] = []
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merge [] (c:cs) = (Right $ entityVal c) : merge [] cs
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merge (t:ts) [] = (Left $ entityVal t) : merge ts []
merge (t:ts) (c:cs)
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| transactionTime (entityVal t) < cashCheckTime (entityVal c) = (Left $ entityVal t) : merge ts (c:cs)
| transactionTime (entityVal t) > cashCheckTime (entityVal c) = (Right $ entityVal c) : merge (t:ts) cs