content: {-
  SPDX-License-Identifier: AGPL-3.0-only
  
  This file is part of `statebox/cql`, the categorical query language.
  
  Copyright (C) 2019 Stichting Statebox <https://statebox.nl>
  
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU Affero General Public License for more details.
  
  You should have received a copy of the GNU Affero General Public License
  along with this program.  If not, see <https://www.gnu.org/licenses/>.
  -}
  module Api.App where
  
  import           Api.Config.Config      (Config (Config))
  import           Api.Config.Environment (Environment (Development))
  import           Api.Lib                (startApp)
  
  -- base
  import           Data.Maybe             (fromMaybe)
  import           System.Environment     (lookupEnv)
  import           Text.Read              (readMaybe)
  
  app :: IO ()
  app = do
    environment <- lookupEnvVar "CQL_ENV" Development
    apiPort <- lookupEnvVar "PORT" 8080
    startApp $ Config environment apiPort
  
  lookupEnvVar :: (Read a, Show a) => String -> a -> IO a
  lookupEnvVar variable default' = do
      maybeValue <- lookupEnv variable
      return $ fromMaybe default' $ readMaybe =<< maybeValue
  