module XNobar.Internal.Notification (
  CapId,
  uncap,
  Id,
  makeId,
  Notification(..),
  urgency,
  NotificationsById,
  append,
  parseNotif,
  notifyInSig,
  notifyOutSig
) where

import DBus (Variant, fromVariant, Type(..))
import Data.Int (Int32)
import Data.Map.Strict hiding (filter)
import Data.Maybe (fromJust, fromMaybe)
import Data.Semigroup (Max)
import Data.Word (Word8, Word32)
import Flow ((.>))
import Prelude hiding (String, lookup)
import qualified Prelude as P (String)

import XNobar.Internal.Positive32

type String = P.String -- in case I want to change type
type Id = Positive32
makeId = positive32

newtype CapId = CapId { uncap :: Max Id } deriving (Eq, Ord, Bounded, Semigroup, Monoid)

instance Enum CapId where
  toEnum = error "Not meant to be used"
  fromEnum = error "Not meant to be used"
  pred = error "Not meant to be used"
  succ c@(CapId i)
    | i == maxBound = c
    | otherwise = CapId $ succ i

notifyInSig = [
    TypeString,
    TypeWord32,
    TypeString,
    TypeString,
    TypeString,
    TypeArray TypeString,
    TypeDictionary TypeString TypeString,
    TypeInt32
  ]

notifyOutSig = [TypeWord32]

data Notification = Notification {
  appName    :: !String,
  appIcon    :: !String,
  summary    :: !String,
  body       :: !String,
  actions    :: ![String],
  hints      :: !(Map String Variant),
  expireTout :: !Int32
}

urgency :: Notification -> Word8
urgency n = let u = lookup "urgency" (hints n)
            in case u of
              Nothing -> 0
              (Just x) -> fromMaybe 0 (fromVariant x)

parseNotif :: [Variant] -> (Word32, Notification)
parseNotif [name, rid, icon, summary, body, actions, hints, expire]
  = (fromJust $ fromVariant rid,
     Notification (fromJust $ fromVariant name)
                  (fromJust $ fromVariant icon)
                  (fromJust $ fromVariant summary)
                  (fromJust $ fromVariant body)
                  (fromJust $ fromVariant actions)
                  (fromJust $ fromVariant hints)
                  (fromJust $ fromVariant expire))
parseNotif _ = error "WTF, something went wrong with DBus?"

type NotificationsById = [(Id, Notification)]

append :: Eq i => [(i, n)] -> (i, n) -> [(i, n)]
ns `append` n = let ns' = filter (theId .> (/= theId n)) ns
                in ns' <> [n]
                where
                  theId = fst