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

import Network.API.Telegram.Bot.Object.Update.Message.Content.File.Audio as Exports
import Network.API.Telegram.Bot.Object.Update.Message.Content.File.Document as Exports
import Network.API.Telegram.Bot.Object.Update.Message.Content.File.Size as Exports
import Network.API.Telegram.Bot.Object.Update.Message.Content.File.Video as Exports
import Network.API.Telegram.Bot.Object.Update.Message.Content.File.Voice as Exports

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

data File
        = Audiofile Audio
        | Videofile Video
        | General Document
        | Voicerecord Voice
        | Photo [Size]
        deriving Show

instance FromJSON File where
        parseJSON = withObject "Message" $ \v -> photo v <|> document v
                <|> audio v <|> video v <|> voice v where

                audio :: Object -> Parser File
                audio v = Audiofile <$> v .: "audio"

                document :: Object -> Parser File
                document v = General <$> v .: "document"

                photo :: Object -> Parser File
                photo v = Photo <$> v .: "photo"

                video :: Object -> Parser File
                video v = Videofile <$> v .: "video"

                voice :: Object -> Parser File
                voice v = Voicerecord <$> v .: "voice"