From 86c8896ee69b068368b4ef9a4c3923285907c328 Mon Sep 17 00:00:00 2001
From: Rutger Broekhoff
Date: Tue, 18 Mar 2025 15:29:27 +0100
Subject: Parsing ING statements (POC)

---
 app/Import/Ing/Shared.hs | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 app/Import/Ing/Shared.hs

(limited to 'app/Import/Ing/Shared.hs')

diff --git a/app/Import/Ing/Shared.hs b/app/Import/Ing/Shared.hs
new file mode 100644
index 0000000..c70f225
--- /dev/null
+++ b/app/Import/Ing/Shared.hs
@@ -0,0 +1,47 @@
+module Import.Ing.Shared where
+
+import Data.Attoparsec.Text qualified as AP
+import Data.Char (digitToInt, ord)
+import Data.Csv qualified as C
+import Data.Decimal (Decimal, DecimalRaw (Decimal), normalizeDecimal)
+import Data.Iban (Iban, mkIban)
+import Data.Text qualified as T
+import Data.Time.Calendar (Day)
+import Data.Time.Clock (UTCTime)
+import Data.Time.Format (defaultTimeLocale, parseTimeM)
+import Data.Time.Zones (TZ, localTimeToUTCTZ)
+
+data DebitCredit = Debit | Credit deriving (Show)
+
+readDecimal :: T.Text -> Either String Decimal
+readDecimal = AP.parseOnly $ do
+  decPart <- AP.decimal
+  _ <- AP.char ','
+  f1 <- AP.digit
+  f2 <- AP.digit
+  AP.endOfInput
+  let fracPart = fromIntegral $ digitToInt f1 * 10 + digitToInt f2
+  return $ normalizeDecimal (Decimal 2 (decPart * 100 + fracPart))
+
+scsvOptions :: C.DecodeOptions
+scsvOptions = C.defaultDecodeOptions {C.decDelimiter = fromIntegral (ord ';')}
+
+eitherToCP :: Either String a -> C.Parser a
+eitherToCP = either fail return
+
+decimalCP :: T.Text -> C.Parser Decimal
+decimalCP = eitherToCP . readDecimal
+
+dateCP :: String -> T.Text -> C.Parser Day
+dateCP fmt = parseTimeM False defaultTimeLocale fmt . T.unpack
+
+maybeCP :: (T.Text -> C.Parser a) -> T.Text -> C.Parser (Maybe a)
+maybeCP p t = if T.null t then return Nothing else Just <$> p t
+
+ibanCP :: T.Text -> C.Parser Iban
+ibanCP = eitherToCP . mkIban
+
+timestampCP :: String -> TZ -> T.Text -> C.Parser UTCTime
+timestampCP fmt amsTz t = do
+  localTime <- parseTimeM False defaultTimeLocale fmt (T.unpack t)
+  return $ localTimeToUTCTZ amsTz localTime
-- 
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