{-# LANGUAGE CPP               #-}
{-# LANGUAGE OverloadedStrings #-}
module Main
  ( main
  ) where

import qualified Ide.Plugin.CabalFmt as CabalFmt
import           System.Directory    (findExecutable)
import           System.FilePath
import           Test.Hls

data CabalFmtFound = Found | NotFound

isTestIsolated :: Bool
#if isolateTests
isTestIsolated = True
#else
isTestIsolated = False
#endif

isCabalFmtFound :: IO CabalFmtFound
isCabalFmtFound = case isTestIsolated of
  True -> pure Found
  False-> do
    cabalFmt <- findExecutable "cabal-fmt"
    pure $ maybe NotFound (const Found) cabalFmt

main :: IO ()
main = do
  foundCabalFmt <- isCabalFmtFound
  defaultTestRunner (tests foundCabalFmt)

cabalFmtPlugin :: PluginTestDescriptor CabalFmt.Log
cabalFmtPlugin = mkPluginTestDescriptor CabalFmt.descriptor "cabal-fmt"

tests :: CabalFmtFound -> TestTree
tests found = testGroup "cabal-fmt"
  [ knownBrokenOnWindows "Eats newlines between comments" $
    cabalFmtGolden found "formats a simple document" "simple_testdata" "formatted_document" $ \doc -> do
      formatDoc doc (FormattingOptions 2 True Nothing Nothing Nothing)

  , expectFailBecause "cabal-fmt can't expand modules if .cabal file is read from stdin. Tracking issue: https://github.com/phadej/cabal-fmt/pull/82" $
    cabalFmtGolden found "formats a document with expand:src comment" "commented_testdata" "formatted_document" $ \doc -> do
      formatDoc doc (FormattingOptions 2 True Nothing Nothing Nothing)

  , cabalFmtGolden found "formats a document with lib information" "lib_testdata" "formatted_document" $ \doc -> do
      formatDoc doc (FormattingOptions 10 True Nothing Nothing Nothing)
  ]

cabalFmtGolden :: CabalFmtFound -> TestName -> FilePath -> FilePath -> (TextDocumentIdentifier -> Session ()) -> TestTree
cabalFmtGolden NotFound title _ _ _ =
  testCase title $
    assertFailure $  "Couldn't find cabal-fmt on PATH or this is not an isolated run. "
                  <> "Use cabal flag 'isolateTests' to make it isolated or install cabal-fmt locally."
cabalFmtGolden Found title path desc act = goldenWithCabalDocFormatter def cabalFmtPlugin "cabal-fmt" conf title testDataDir path desc "cabal" act
  where
    conf = def

testDataDir :: FilePath
testDataDir = "plugins" </> "hls-cabal-fmt-plugin" </> "test" </> "testdata"