mateamt/src/Model/Journal.hs

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{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE Arrows #-}
module Model.Journal where
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import Data.Maybe (isJust)
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import Data.Time (UTCTime)
import Data.Time.Clock
import qualified Data.Text as T
import Data.Profunctor.Product (p5)
import qualified Database.PostgreSQL.Simple as PGS
import Control.Arrow
import Opaleye as O hiding (null, not)
import Opaleye.Constant as C
import Control.Monad.IO.Class (liftIO)
-- internal imports
import Types
initJournal :: PGS.Query
initJournal = mconcat
[ "CREATE TABLE IF NOT EXISTS \"journal\" ("
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, "journal_id SERIAL NOT NULL,"
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, "journal_timestamp TIMESTAMPTZ NOT NULL,"
, "journal_description TEXT NOT NULL,"
, "journal_total_amount INTEGER NOT NULL,"
, "journal_entry_is_check BOOLEAN NOT NULL,"
, "PRIMARY KEY (journal_id)"
, ")"
]
journalTable :: Table
( Maybe (Field SqlInt4)
, Field SqlTimestamptz
, Field SqlText
, Field SqlInt4
, Field SqlBool
)
( Field SqlInt4
, Field SqlTimestamptz
, Field SqlText
, Field SqlInt4
, Field SqlBool
)
journalTable = table "journal" (
p5
( tableField "journal_id"
, tableField "journal_timestamp"
, tableField "journal_description"
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, tableField "journal_total_amount"
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, tableField "journal_entry_is_check"
)
)
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selectJournalEntries
:: Maybe Int -- limit
-> Maybe Int -- offset
-> PGS.Connection
-> MateHandler [JournalEntry]
selectJournalEntries mlimit moffset conn = liftIO $ do
let lim = case mlimit of
Just l -> limit (l + 1)
Nothing -> id
off = case moffset of
Just o -> offset o
Nothing -> id
entries <- runSelect conn
( proc () -> do
ret <- lim $ off $ orderBy (desc (\(id_, _, _, _, _) -> id_))
(queryTable journalTable) -< ()
returnA -< ret
) :: IO
[ ( Int
, UTCTime
, T.Text
, Int
, Bool
)
]
return $ fst $ foldr
(\(id_, ts, desc, tot, check) (fin, last)->
(JournalEntry id_ desc ts (tot - last) tot check : fin, tot)
)
( []
, if isJust mlimit && not (null entries)
then (\(_, _, _, x, _) -> x) (last entries)
else 0
)
( if isJust mlimit && length entries > 1
then init entries
else entries
)
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selectLatestJournalEntry
:: PGS.Connection
-> MateHandler (Maybe JournalEntry)
selectLatestJournalEntry conn = liftIO $ do
lastTwoEntries <- runSelect conn
( proc () -> do
ret <- limit 2 (orderBy (desc (\(id_, _, _, _, _) -> id_))
(queryTable journalTable)) -< ()
returnA -< ret
) :: IO
[ ( Int
, UTCTime
, T.Text
, Int
, Bool
)
]
if not (null lastTwoEntries)
then do
let diff = foldl (\acc (_, _, _, tot, _) -> tot - acc) 0 lastTwoEntries
(id, ts, desc, total, check) = head lastTwoEntries
return $ Just $ JournalEntry id desc ts diff total check
else
return Nothing
insertNewJournalEntry
:: JournalSubmit
-> PGS.Connection
-> MateHandler Int
insertNewJournalEntry (JournalSubmit desc amount) conn = do
lastTotal <- (\x -> case x of
Just j -> journalEntryTotalAmount j
Nothing -> 0
) <$> selectLatestJournalEntry conn
liftIO $ do
now <- getCurrentTime
fmap head $ runInsert_ conn $ Insert
{ iTable = journalTable
, iRows =
[
( C.constant (Nothing :: Maybe Int)
, C.constant now
, C.constant desc
, C.constant (lastTotal + amount)
, C.constant False
)
]
, iReturning = rReturning (\(id_, _, _, _, _) -> id_)
, iOnConflict = Nothing
}