{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE FlexibleContexts   #-}

module Gargantext.Database.Private where

import qualified Database.PostgreSQL.Simple as PGS

import Data.Monoid ((<>))
import Data.Either.Extra (Either(Left, Right))
import Gargantext.Prelude
import Data.Text (unpack, pack)
import Text.Read (read)
import Data.Ini (readIniFile, lookupValue)
import Data.Word (Word16)
import System.IO (FilePath)
import Database.PostgreSQL.Simple (Connection, connect)

-- TODO add a reader Monad here
-- read this in the init file

databaseParameters :: FilePath -> IO PGS.ConnectInfo
databaseParameters fp = do
  ini         <- readIniFile fp
  let ini'' = case ini of
        Left e     -> panic (pack $ "No ini file error" <> show e)
        Right ini' -> ini'

  let val x = case (lookupValue (pack "django") (pack x) ini'') of
        Left _ -> panic (pack $ "no" <> x)
        Right p' -> unpack p'

  pure $ PGS.ConnectInfo { PGS.connectHost = val "DB_HOST"
                               , PGS.connectPort = read (val "DB_PORT") :: Word16
                               , PGS.connectUser = val "DB_USER"
                               , PGS.connectPassword = val "DB_PASS"
                               , PGS.connectDatabase = val "DB_NAME" }

connectGargandb :: FilePath -> IO Connection
connectGargandb fp = do
    parameters <- databaseParameters fp
    connect parameters