112 lines
2.6 KiB
Haskell
112 lines
2.6 KiB
Haskell
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE Arrows #-}
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module Model.Journal where
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import Data.Time (UTCTime)
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import Data.Time.Clock
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import qualified Data.Text as T
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import Data.Profunctor.Product (p5)
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import qualified Database.PostgreSQL.Simple as PGS
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import Control.Arrow
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import Opaleye as O hiding (null, not)
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import Opaleye.Constant as C
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import Control.Monad.IO.Class (liftIO)
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-- internal imports
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import Types
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initJournal :: PGS.Query
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initJournal = mconcat
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[ "CREATE TABLE IF NOT EXISTS \"journal\" ("
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, "journal_id SERIAL NOT NULL ON DELETE CASCADE,"
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, "journal_timestamp TIMESTAMPTZ NOT NULL,"
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, "journal_description TEXT NOT NULL,"
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, "journal_total_amount INTEGER NOT NULL,"
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, "journal_entry_is_check BOOLEAN NOT NULL,"
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, "PRIMARY KEY (journal_id)"
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, ")"
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]
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journalTable :: Table
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( Maybe (Field SqlInt4)
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, Field SqlTimestamptz
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, Field SqlText
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, Field SqlInt4
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, Field SqlBool
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)
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( Field SqlInt4
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, Field SqlTimestamptz
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, Field SqlText
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, Field SqlInt4
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, Field SqlBool
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)
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journalTable = table "journal" (
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p5
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( tableField "journal_id"
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, tableField "journal_timestamp"
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, tableField "journal_description"
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, tableField "journal_total_amout"
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, tableField "journal_entry_is_check"
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)
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)
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selectLatestJournalEntry
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:: PGS.Connection
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-> MateHandler (Maybe JournalEntry)
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selectLatestJournalEntry conn = liftIO $ do
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lastTwoEntries <- runSelect conn
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( proc () -> do
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ret <- limit 2 (orderBy (desc (\(id_, _, _, _, _) -> id_))
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(queryTable journalTable)) -< ()
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returnA -< ret
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) :: IO
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[ ( Int
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, UTCTime
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, T.Text
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, Int
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, Bool
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)
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]
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if not (null lastTwoEntries)
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then do
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let diff = foldl (\acc (_, _, _, tot, _) -> tot - acc) 0 lastTwoEntries
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(id, ts, desc, total, check) = head lastTwoEntries
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return $ Just $ JournalEntry id desc ts diff total check
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else
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return Nothing
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insertNewJournalEntry
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:: JournalSubmit
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-> PGS.Connection
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-> MateHandler Int
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insertNewJournalEntry (JournalSubmit desc amount) conn = do
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lastTotal <- (\x -> case x of
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Just j -> journalEntryTotalAmount j
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Nothing -> 0
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) <$> selectLatestJournalEntry conn
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liftIO $ do
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now <- getCurrentTime
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fmap head $ runInsert_ conn $ Insert
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{ iTable = journalTable
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, iRows =
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[
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( C.constant (Nothing :: Maybe Int)
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, C.constant now
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, C.constant desc
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, C.constant (lastTotal + amount)
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, C.constant False
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)
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]
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, iReturning = rReturning (\(id_, _, _, _, _) -> id_)
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, iOnConflict = Nothing
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}
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