-- Copyright (c) 2013-2014 PivotCloud, Inc.
--
-- Main
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-- Licensed under the Apache License, Version 2.0 (the "License"); you may
-- not use this file except in compliance with the License. You may obtain a
-- copy of the License at http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
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{-# LANGUAGE ConstraintKinds #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE UnicodeSyntax #-}

module Main where

import Aws.Kinesis.Reshard.Analysis
import Aws.Kinesis.Reshard.Monad
import Aws.Kinesis.Reshard.Shards

import Control.Concurrent.Lifted
import Control.Lens
import Control.Monad.Trans.Either
import Control.Monad.Trans.Reader (runReaderT)
import Control.Monad.Trans.Resource
import Control.Monad.Unicode
import Data.Traversable
import qualified Options.Applicative as OA
import Prelude.Unicode

loop
  ∷ MonadReshard m
  ⇒ m ()
loop = do
  recommendation ← analyzeStream
  liftIO ∘ putStrLn $
    case recommendation of
      Nothing → "No resharding action recommended at this time"
      Just rsa → "Will perform resharding action: " ++ show rsa
  _ ← for recommendation performReshardingAction
  threadDelay =≪ view oReshardingInterval
  loop

main ∷ IO ()
main =
  eitherT (fail ∘ show) return ∘ runResourceT $
    liftIO (OA.execParser parserInfo)
      ≫= runReaderT loop