module Network.API.Telegram.Bot.Object.Update (Update (..), module Exports) where

import Network.API.Telegram.Bot.Object.Update.Callback as Exports
import Network.API.Telegram.Bot.Object.Update.Message as Exports
import Network.API.Telegram.Bot.Object.Update.Moving as Exports

import "aeson" Data.Aeson (FromJSON (parseJSON), withObject, (.:))
import "aeson" Data.Aeson.Types (Object, Parser)
import "base" Control.Applicative (Applicative ((<*>)), Alternative ((<|>)))
import "base" Data.Function (($))
import "base" Data.Functor ((<$>))
import "base" Data.Int (Int)
import "base" Text.Show (Show)

import Network.API.Telegram.Bot.Object.Update.Callback (Callback)
import Network.API.Telegram.Bot.Object.Update.Message (Message)
import Network.API.Telegram.Bot.Object.Update.Moving (Moving)
import Network.API.Telegram.Bot.Property.Identifiable (Identifiable (Identificator, ident))

data Update
        = Query Int Callback
        | Membership Int Moving
        | Incoming Int Message
        deriving Show

instance Identifiable Update where
        type Identificator Update = Int
        ident (Query i _) = i
        ident (Membership i _) = i
        ident (Incoming i _) = i

instance FromJSON Update where
        parseJSON = withObject "Update" $ \v ->
                query v <|> membership v <|> incoming v where

                query :: Object -> Parser Update
                query v = Query <$> v .: "update_id" <*> v .: "callback_query"

                membership :: Object -> Parser Update
                membership v = Membership <$> v .: "update_id" <*> v .: "message"

                incoming :: Object -> Parser Update
                incoming v = Incoming <$> v .: "update_id" <*> v .: "message"