{-# LANGUAGE DeriveAnyClass    #-}
{-# LANGUAGE DeriveGeneric     #-}
{-# LANGUAGE NamedFieldPuns    #-}
{-# LANGUAGE OverloadedStrings #-}

module Main where

import           Data.Maybe                    (fromMaybe)
import           WithCli

import           CheckMap                      (runLinter)
import           Data.Aeson                    (encode)
import           Data.Aeson.Encode.Pretty      (encodePretty)
import qualified Data.ByteString.Lazy          as LB
import qualified Data.ByteString.Lazy.Encoding as LB
import           Data.Text.Lazy                as T
import           System.IO                     (utf8)
import           Tiled2

-- | the options this cli tool can take
data Options = Options
  { inpath       :: Maybe String
  -- ^ path to input map files
  , outpath      :: Maybe String
  -- ^ path to out directory (should be empty)
  , allowScripts :: Bool
  -- ^ pass --allowScripts to allow javascript in map
  , scriptInject :: Maybe String
  -- ^ optional filepath to javascript that should be injected
  , json         :: Bool
  -- ^ emit json if --json was given
  , pretty       :: Bool
  -- ^ pretty-print the json to make it human-readable
  } deriving (Show, Generic, HasArguments)


main :: IO ()
main = withCli run

run :: Options -> IO ()
run options = do
  -- TODO: what if parsing fails and we get Left err?
  Right waMap <- loadTiledmap $ fromMaybe "example.json" (inpath options)

  let lints = runLinter waMap

  if json options
    then printLB
    $ if pretty options then encodePretty lints else encode lints
    else print lints

-- | haskell's many string types are FUN …
printLB :: LB.ByteString -> IO ()
printLB = putStrLn . T.unpack . LB.decode utf8