{- FOURMOLU_DISABLE -}
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-- SOFTWARE.
{- FOURMOLU_ENABLE -}
{-# LANGUAGE BlockArguments #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DerivingStrategies #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE OverloadedRecordDot #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}

module Language.EO.Phi.RewriteSpec where

import Control.Monad (forM_)
import Data.Yaml qualified as Yaml
import GHC.Generics (Generic)
import Language.EO.Phi (Program (..))
import Language.EO.Phi.Dataize.Context (defaultContext)
import Language.EO.Phi.Rules.Common (applyRules)
import Language.EO.Phi.Rules.Yaml (convertRuleNamed, parseRuleSetFromFile, rules)
import Language.EO.Phi.Syntax (printTree)
import Language.EO.Phi.TH
import Test.EO.Phi (progToObj)
import Test.Hspec

data Test = Test
  { name :: String
  , input :: Program
  , output :: Program
  }
  deriving stock (Generic, Show)

$(deriveFromJSON ''Test)

data RewriteTests = RewriteTests
  { title :: String
  , tests :: [Test]
  }
  deriving stock (Generic, Show)

$(deriveFromJSON ''RewriteTests)

spec :: Spec
spec = do
  rewriteTests <- runIO (Yaml.decodeFileThrow @_ @RewriteTests "test/eo/phi/rewriting.yaml")
  describe rewriteTests.title do
    forM_
      [ ("New Yegor's rules", "test/eo/phi/rules/new.yaml")
      ]
      $ \(rulesTitle, rulesFile) -> do
        ruleset <- runIO $ parseRuleSetFromFile rulesFile
        let rules' = convertRuleNamed <$> ruleset.rules
        describe rulesTitle do
          forM_ rewriteTests.tests $
            \test -> it test.name do
              let
                inputObj = progToObj test.input
                expectedOutputObj = progToObj test.output
                ctx = defaultContext rules' inputObj
                outputObj = head $ applyRules ctx inputObj
              printTree outputObj `shouldBe` printTree expectedOutputObj