{-# LANGUAGE DoAndIfThenElse #-}

module TestCoreFn (spec) where

import Prelude ()
import Prelude.Compat

import Data.Aeson
import Data.Aeson.Types as Aeson
import Data.Map as M
import Data.Version

import Language.PureScript.AST.Literals
import Language.PureScript.AST.SourcePos
import Language.PureScript.Comments
import Language.PureScript.CoreFn
import Language.PureScript.CoreFn.FromJSON
import Language.PureScript.CoreFn.ToJSON
import Language.PureScript.Names
import Language.PureScript.PSString

import Test.Hspec

parseModule :: Value -> Result (Version, Module Ann)
parseModule = parse moduleFromJSON

-- convert a module to its json CoreFn representation and back
parseMod :: Module Ann -> Result (Module Ann)
parseMod m =
  let v = Version [0] []
  in snd <$> parseModule (moduleToJSON v m)

isSuccess :: Result a -> Bool
isSuccess (Aeson.Success _) = True
isSuccess _           = False

spec :: Spec
spec = context "CoreFnFromJson" $ do
  let mn = ModuleName "Example.Main"
      mp = "src/Example/Main.purs"
      ss = SourceSpan mp (SourcePos 0 0) (SourcePos 0 0)
      ann = ssAnn ss

  specify "should parse version" $ do
    let v = Version [0, 13, 6] []
        m = Module ss [] mn mp [] [] M.empty [] []
        r = fst <$> parseModule (moduleToJSON v m)
    r `shouldSatisfy` isSuccess
    case r of
      Error _   -> return ()
      Aeson.Success v' -> v' `shouldBe` v

  specify "should parse an empty module" $ do
    let r = parseMod $ Module ss [] mn mp [] [] M.empty [] []
    r `shouldSatisfy` isSuccess
    case r of
      Error _   -> return ()
      Aeson.Success m -> moduleName m `shouldBe` mn

  specify "should parse source span" $ do
    let r = parseMod $ Module ss [] mn mp [] [] M.empty [] []
    r `shouldSatisfy` isSuccess
    case r of
      Error _   -> return ()
      Aeson.Success m -> moduleSourceSpan m `shouldBe` ss

  specify "should parse module path" $ do
    let r = parseMod $ Module ss [] mn mp [] [] M.empty [] []
    r `shouldSatisfy` isSuccess
    case r of
      Error _   -> return ()
      Aeson.Success m -> modulePath m `shouldBe` mp

  specify "should parse imports" $ do
    let r = parseMod $ Module ss [] mn mp [(ann, mn)] [] M.empty [] []
    r `shouldSatisfy` isSuccess
    case r of
      Error _   -> return ()
      Aeson.Success m -> moduleImports m `shouldBe` [(ann, mn)]

  specify "should parse exports" $ do
    let r = parseMod $ Module ss [] mn mp [] [Ident "exp"] M.empty [] []
    r `shouldSatisfy` isSuccess
    case r of
      Error _   -> return ()
      Aeson.Success m -> moduleExports m `shouldBe` [Ident "exp"]

  specify "should parse re-exports" $ do
    let r = parseMod $ Module ss [] mn mp [] [] (M.singleton (ModuleName "Example.A") [Ident "exp"]) [] []
    r `shouldSatisfy` isSuccess
    case r of
      Error _   -> return ()
      Aeson.Success m -> moduleReExports m `shouldBe` M.singleton (ModuleName "Example.A") [Ident "exp"]


  specify "should parse foreign" $ do
    let r = parseMod $ Module ss [] mn mp [] [] M.empty [Ident "exp"] []
    r `shouldSatisfy` isSuccess
    case r of
      Error _   -> return ()
      Aeson.Success m -> moduleForeign m `shouldBe` [Ident "exp"]

  context "Expr" $ do
    specify "should parse literals" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec ann (Ident "x1") $ Literal ann (NumericLiteral (Left 1))
                , NonRec ann (Ident "x2") $ Literal ann (NumericLiteral (Right 1.0))
                , NonRec ann (Ident "x3") $ Literal ann (StringLiteral (mkString "abc"))
                , NonRec ann (Ident "x4") $ Literal ann (CharLiteral 'c')
                , NonRec ann (Ident "x5") $ Literal ann (BooleanLiteral True)
                , NonRec ann (Ident "x6") $ Literal ann (ArrayLiteral [Literal ann (CharLiteral 'a')])
                , NonRec ann (Ident "x7") $ Literal ann (ObjectLiteral [(mkString "a", Literal ann (CharLiteral 'a'))])
                ]
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse Constructor" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec ann (Ident "constructor") $ Constructor ann (ProperName "Either") (ProperName "Left") [Ident "value0"] ]
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse Accessor" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec ann (Ident "x") $
                    Accessor ann (mkString "field") (Literal ann $ ObjectLiteral [(mkString "field", Literal ann (NumericLiteral (Left 1)))]) ]
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse ObjectUpdate" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec ann (Ident "objectUpdate") $
                    ObjectUpdate ann
                      (Literal ann $ ObjectLiteral [(mkString "field", Literal ann (StringLiteral (mkString "abc")))])
                      [(mkString "field", Literal ann (StringLiteral (mkString "xyz")))]
                ]
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse Abs" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec ann (Ident "abs")
                    $ Abs ann (Ident "x") (Var ann (Qualified (Just mn) (Ident "x")))
                ]
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse App" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec ann (Ident "app")
                    $ App ann
                        (Abs ann (Ident "x") (Var ann (Qualified Nothing (Ident "x"))))
                        (Literal ann (CharLiteral 'c'))
                ]
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse Case" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec ann (Ident "case") $
                    Case ann [Var ann (Qualified Nothing (Ident "x"))]
                      [ CaseAlternative
                        [ NullBinder ann ]
                        (Right (Literal ann (CharLiteral 'a')))
                      ]
                ]
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse Case with guards" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec ann (Ident "case") $
                    Case ann [Var ann (Qualified Nothing (Ident "x"))]
                      [ CaseAlternative
                        [ NullBinder ann ]
                        (Left [(Literal ann (BooleanLiteral True), Literal ann (CharLiteral 'a'))])
                      ]
                ]
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse Let" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec ann (Ident "case") $
                    Let ann
                      [ Rec [((ann, Ident "a"), Var ann (Qualified Nothing (Ident "x")))] ]
                      (Literal ann (BooleanLiteral True))
                ]
      parseMod m `shouldSatisfy` isSuccess

  context "Meta" $ do
    specify "should parse IsConstructor" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec (ss, [], Nothing, Just (IsConstructor ProductType [Ident "x"])) (Ident "x") $
                  Literal (ss, [], Nothing, Just (IsConstructor SumType [])) (CharLiteral 'a')
                ]
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse IsNewtype" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec (ss, [], Nothing, Just IsNewtype) (Ident "x") $
                  Literal ann (CharLiteral 'a')
                ]
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse IsTypeClassConstructor" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec (ss, [], Nothing, Just IsTypeClassConstructor) (Ident "x") $
                  Literal ann (CharLiteral 'a')
                ]
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse IsForeign" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec (ss, [], Nothing, Just IsForeign) (Ident "x") $
                  Literal ann (CharLiteral 'a')
                ]
      parseMod m `shouldSatisfy` isSuccess

  context "Binders" $ do
    specify "should parse LiteralBinder" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec ann (Ident "case") $
                    Case ann [Var ann (Qualified Nothing (Ident "x"))]
                      [ CaseAlternative
                        [ LiteralBinder ann (BooleanLiteral True) ]
                        (Right (Literal ann (CharLiteral 'a')))
                      ]
                ]
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse VarBinder" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec ann (Ident "case") $
                    Case ann [Var ann (Qualified Nothing (Ident "x"))]
                      [ CaseAlternative
                        [ ConstructorBinder
                            ann
                            (Qualified (Just (ModuleName "Data.Either")) (ProperName "Either"))
                            (Qualified Nothing (ProperName "Left"))
                            [VarBinder ann (Ident "z")]
                        ]
                        (Right (Literal ann (CharLiteral 'a')))
                      ]
                ]
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse NamedBinder" $ do
      let m = Module ss [] mn mp [] [] M.empty []
                [ NonRec ann (Ident "case") $
                    Case ann [Var ann (Qualified Nothing (Ident "x"))]
                      [ CaseAlternative
                        [ NamedBinder ann (Ident "w") (NamedBinder ann (Ident "w'") (VarBinder ann (Ident "w''"))) ]
                        (Right (Literal ann (CharLiteral 'a')))
                      ]
                ]
      parseMod m `shouldSatisfy` isSuccess

  context "Comments" $ do
    specify "should parse LineComment" $ do
      let m = Module ss [ LineComment "line" ] mn mp [] [] M.empty [] []
      parseMod m `shouldSatisfy` isSuccess

    specify "should parse BlockComment" $ do
      let m = Module ss [ BlockComment "block" ] mn mp [] [] M.empty [] []
      parseMod m `shouldSatisfy` isSuccess