{-# LANGUAGE DataKinds           #-}
{-# LANGUAGE QuasiQuotes         #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell     #-}
{-# LANGUAGE RecordWildCards  #-}

module Handler.Version where

import           Startlude hiding (Handler)

import           Control.Monad.Trans.Maybe
import           Yesod.Core

import           Foundation
import           Handler.Types.Status
import           Lib.Registry
import           Lib.Types.Emver
import           Settings
import           System.FilePath                ( (</>) )
import           Util.Shared
import           System.Directory               ( doesFileExist )

getVersionR :: Handler AppVersionRes
getVersionR = do
    rv <- AppVersionRes . registryVersion . appSettings <$> getYesod
    pure $ rv Nothing Nothing

getVersionAppR :: Text -> Handler (Maybe AppVersionRes)
getVersionAppR appId = do
    appsDir <- (</> "apps") . resourcesDir . appSettings <$> getYesod
    getVersionWSpec appsDir appExt
    where appExt = Extension (toS appId) :: Extension "s9pk"

getVersionSysR :: Text -> Handler (Maybe AppVersionRes)
getVersionSysR sysAppId = runMaybeT $ do
    sysDir <- (</> "sys") . resourcesDir . appSettings <$> getYesod
    avr    <- MaybeT $ getVersionWSpec sysDir sysExt
    let notesPath = sysDir </> "agent" </> show (appVersionVersion avr) </> "release-notes.md"
    notes <- liftIO $ ifM (doesFileExist notesPath) (Just <$> readFile notesPath) (pure Nothing)
    pure $ avr { appVersionMinCompanion = Just $ Version (1, 1, 0, 0), appVersionReleaseNotes = notes }
    where sysExt = Extension (toS sysAppId) :: Extension ""

getVersionWSpec :: KnownSymbol a => FilePath -> Extension a -> Handler (Maybe AppVersionRes)
getVersionWSpec rootDir ext = do
    av <- getVersionFromQuery rootDir ext
    pure $ liftA3 AppVersionRes av (pure Nothing) (pure Nothing)

getSystemStatusR :: Handler OSVersionRes
getSystemStatusR = do
    -- hardcoded to the next major version release so the UI can by dynamic. this might change depending on the version number we decide to release.
    pure $ OSVersionRes NOTHING $ Version (0,3,0,0)