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{-# LANGUAGE BlockArguments     #-}
{-# LANGUAGE DeriveAnyClass     #-}
{-# LANGUAGE DerivingStrategies #-}
{-# LANGUAGE DerivingVia        #-}
{-# LANGUAGE LambdaCase         #-}


module OwnTracks.Command
-- | https://owntracks.org/booklet/tech/json/
  (Command(..)) where

import           Data.Aeson
import           Data.Aeson.Types        (Parser)
import           Data.ByteString         (ByteString)
import           Data.ByteString.Base64
import           Data.Functor            ((<&>))
import           Data.Text               (Text)
import qualified Data.Text               as T
import           Data.Text.Encoding      (encodeUtf8)
import           Data.Time               (UTCTime, defaultTimeLocale,
                                          parseTimeM)
import           Database.Persist
import           GHC.Generics            (Generic)

import           OwnTracks.Configuration
import           OwnTracks.Waypoint

data Command =
    Dump
  -- ^ Triggers the publish of a configuration message (iOS)
  | GetStatus
  -- ^ Triggers the publish of a status message to ../status (iOS)
  | ReportSteps { reportStepsFrom :: Maybe Int, reportStepsTo :: Maybe Int }
  -- ^ Triggers the report of a steps messages_(iOS)_
  | ReportLocation
  -- ^ Triggers the publish of a location messages (iOS,Android) Don‘t expect device to be online. Send with QoS>0. Device will receive and repond when activated next time
  | ClearWaypoints
  -- ^ deletes all waypoints/regions (iOS)
  | SetWaypoints [Waypoint]
  -- ^ Imports (merge) and activates new waypoints (iOS,Android)
  | SetConfiguration Configuration
  -- ^ Imports and activates new configuration values (iOS,Android)
  | GetWaypoints
  -- ^ Triggers publish of a waypoints message (iOS,Android)

instance ToJSON Command where
  toJSON c = object ( "_type" .= String "cmd"
                    : "action" .= String action
                    : others )
    where action = case c of
            Dump               -> "dump"
            GetStatus          -> "status"
            ReportSteps _ _    -> "reportSteps"
            ReportLocation     -> "reportLocation"
            ClearWaypoints     -> "clearWaypoints"
            SetWaypoints _     -> "setWaypoints"
            SetConfiguration _ -> "setConfiguration"
            GetWaypoints       -> "waypoints"
          others = case c of
            ReportSteps f t    -> [ "from" .= f, "to" .= t ]
            SetWaypoints ws    -> [ "waypoints" .= ws ]
            SetConfiguration c -> [ "configuration" .= c ]
            _                  -> []