#[macro_use]
extern crate pretty_assertions;
#[macro_use]
extern crate indoc;

extern crate bumpalo;
extern crate inkwell;
extern crate libc;
extern crate roc_gen;

#[macro_use]
mod helpers;

#[cfg(test)]
mod gen_primitives {
    use roc_std::RocStr;

    #[test]
    fn basic_int() {
        assert_evals_to!("123", 123, i64);
    }

    #[test]
    fn basic_float() {
        assert_evals_to!("1234.0", 1234.0, f64);
    }

    #[test]
    fn branch_first_float() {
        assert_evals_to!(
            indoc!(
                r#"
                    when 1.23 is
                        1.23 -> 12
                        _ -> 34
                "#
            ),
            12,
            i64
        );
    }

    #[test]
    fn branch_second_float() {
        assert_evals_to!(
            indoc!(
                r#"
                    when 2.34 is
                        1.23 -> 63
                        _ -> 48
                "#
            ),
            48,
            i64
        );
    }

    #[test]
    fn branch_third_float() {
        assert_evals_to!(
            indoc!(
                r#"
                   when 10.0 is
                       1.0 -> 63
                       2.0 -> 48
                       _ -> 112
                "#
            ),
            112,
            i64
        );
    }

    #[test]
    fn branch_first_int() {
        assert_evals_to!(
            indoc!(
                r#"
                    when 1 is
                        1 -> 12
                        _ -> 34
                "#
            ),
            12,
            i64
        );
    }

    #[test]
    fn branch_second_int() {
        assert_evals_to!(
            indoc!(
                r#"
                    when 2 is
                        1 -> 63
                        _ -> 48
                "#
            ),
            48,
            i64
        );
    }

    #[test]
    fn branch_third_int() {
        assert_evals_to!(
            indoc!(
                r#"
                    when 10 is
                        1 -> 63
                        2 -> 48
                        _ -> 112
                "#
            ),
            112,
            i64
        );
    }

    #[test]
    fn branch_store_variable() {
        assert_evals_to!(
            indoc!(
                r#"
                    when 0 is
                        1 -> 12
                        a -> a
                "#
            ),
            0,
            i64
        );
    }

    #[test]
    fn when_one_element_tag() {
        assert_evals_to!(
            indoc!(
                r#"
                x : [ Pair (Int *) (Int *) ]
                x = Pair 0x2 0x3

                when x is
                    Pair l r -> l + r
                "#
            ),
            5,
            i64
        );
    }

    #[test]
    fn when_two_element_tag_first() {
        assert_evals_to!(
            indoc!(
                r#"
                x : [A (Int *), B (Int *)]
                x = A 0x2

                when x is
                    A v -> v
                    B v -> v
                "#
            ),
            2,
            i64
        );
    }

    #[test]
    fn when_two_element_tag_second() {
        assert_evals_to!(
            indoc!(
                r#"
                x : [A (Int *), B (Int *)]
                x = B 0x3

                when x is
                    A v -> v
                    B v -> v
                "#
            ),
            3,
            i64
        );
    }

    #[test]
    fn gen_when_one_branch() {
        assert_evals_to!(
            indoc!(
                r#"
                    when 3.14 is
                        _ -> 23
                "#
            ),
            23,
            i64
        );
    }

    #[test]
    fn gen_large_when_int() {
        assert_evals_to!(
            indoc!(
                r#"
                    foo = \num ->
                        when num is
                            0 -> 200
                            -3 -> 111 # TODO adding more negative numbers reproduces parsing bugs here
                            3 -> 789
                            1 -> 123
                            2 -> 456
                            _ -> 1000

                    foo -3
                "#
            ),
            111,
            i64
        );
    }

    // #[test]
    // fn gen_large_when_float() {
    //     assert_evals_to!(
    //         indoc!(
    //             r#"
    //                 foo = \num ->
    //                     when num is
    //                         0.5 -> 200.1
    //                         -3.6 -> 111.2 # TODO adding more negative numbers reproduces parsing bugs here
    //                         3.6 -> 789.5
    //                         1.7 -> 123.3
    //                         2.8 -> 456.4
    //                         _ -> 1000.6

    //                 foo -3.6
    //             "#
    //         ),
    //         111.2,
    //         f64
    //     );
    // }

    #[test]
    fn or_pattern() {
        assert_evals_to!(
            indoc!(
                r#"
                when 2 is
                    1 | 2 -> 42
                    _ -> 1
                "#
            ),
            42,
            i64
        );
    }

    #[test]
    fn apply_identity() {
        assert_evals_to!(
            indoc!(
                r#"
                    identity = \a -> a

                    identity 5
                "#
            ),
            5,
            i64
        );
    }

    #[test]
    fn apply_unnamed_identity() {
        assert_evals_to!(
            indoc!(
                r#"
                wrapper = \{} ->
                    (\a -> a) 5

                wrapper {}
                "#
            ),
            5,
            i64
        );
    }

    #[test]
    fn return_unnamed_fn() {
        assert_evals_to!(
            indoc!(
                r#"
                wrapper = \{} ->
                    alwaysFloatIdentity : Int * -> (Float * -> Float *)
                    alwaysFloatIdentity = \_ ->
                        (\a -> a)

                    (alwaysFloatIdentity 2) 3.14

                wrapper {}
                "#
            ),
            3.14,
            f64
        );
    }

    #[test]
    fn gen_when_fn() {
        assert_evals_to!(
            indoc!(
                r#"
                    limitedNegate = \num ->
                        when num is
                            1 -> -1
                            -1 -> 1
                            _ -> num

                    limitedNegate 1
                "#
            ),
            -1,
            i64
        );
    }

    #[test]
    fn gen_basic_def() {
        assert_evals_to!(
            indoc!(
                r#"
                    answer = 42

                    answer
                "#
            ),
            42,
            i64
        );

        assert_evals_to!(
            indoc!(
                r#"
                    pi = 3.14

                    pi
                "#
            ),
            3.14,
            f64
        );
    }

    #[test]
    fn gen_multiple_defs() {
        assert_evals_to!(
            indoc!(
                r#"
                    answer = 42

                    pi = 3.14

                    if pi > 3 then answer else answer
                "#
            ),
            42,
            i64
        );

        assert_evals_to!(
            indoc!(
                r#"
                    answer = 42

                    pi = 3.14

                    if answer > 3 then pi else pi
                "#
            ),
            3.14,
            f64
        );
    }

    // These tests caught a bug in how Defs are converted to the mono IR
    // but they have UnusedDef or UnusedArgument problems, and don't run any more
    //    #[test]
    //    fn gen_chained_defs() {
    //        assert_evals_to!(
    //            indoc!(
    //                r#"
    //                    x = i1
    //                    i3 = i2
    //                    i1 = 1337
    //                    i2 = i1
    //                    y = 12.4
    //
    //                    i3
    //                "#
    //            ),
    //            1337,
    //            i64
    //        );
    //    }
    //
    //    #[test]
    //    fn gen_nested_defs_old() {
    //        assert_evals_to!(
    //            indoc!(
    //                r#"
    //                    x = 5
    //
    //                    answer =
    //                        i3 = i2
    //
    //                        nested =
    //                            a = 1.0
    //                            b = 5
    //
    //                            i1
    //
    //                        i1 = 1337
    //                        i2 = i1
    //
    //
    //                        nested
    //
    //                    # None of this should affect anything, even though names
    //                    # overlap with the previous nested defs
    //                    unused =
    //                        nested = 17
    //
    //                        i1 = 84.2
    //
    //                        nested
    //
    //                    y = 12.4
    //
    //                    answer
    //                "#
    //            ),
    //            1337,
    //            i64
    //        );
    //    }
    //
    //    #[test]
    //    fn let_x_in_x() {
    //        assert_evals_to!(
    //            indoc!(
    //                r#"
    //                    x = 5
    //
    //                    answer =
    //                        1337
    //
    //                    unused =
    //                        nested = 17
    //                        nested
    //
    //                    answer
    //                "#
    //            ),
    //            1337,
    //            i64
    //        );
    //    }

    #[test]
    fn factorial() {
        assert_evals_to!(
            indoc!(
                r#"
                factorial = \n, accum ->
                    when n is
                        0 ->
                            accum

                        _ ->
                            factorial (n - 1) (n * accum)

                factorial 10 1
                "#
            ),
            3628800,
            i64
        );
    }

    #[test]
    fn peano1() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                    Peano : [ S Peano, Z ]

                    three : Peano
                    three = S (S (S Z))

                    when three is
                        Z -> 2
                        S _ -> 1
                    "#
            ),
            1,
            i64
        );
    }

    #[test]
    fn peano2() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                    Peano : [ S Peano, Z ]

                    three : Peano
                    three = S (S (S Z))

                    when three is
                        S (S _) -> 1
                        S (_) -> 0
                        Z -> 0
                    "#
            ),
            1,
            i64
        );
    }

    #[test]
    fn top_level_constant() {
        assert_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                pi = 3.1415

                main =
                    pi + pi
                    "#
            ),
            3.1415 + 3.1415,
            f64
        );
    }

    #[test]
    fn linked_list_len_0() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                LinkedList a : [ Nil, Cons a (LinkedList a) ]

                len : LinkedList a -> Int *
                len = \list ->
                    when list is
                        Nil -> 0
                        Cons _ rest -> 1 + len rest

                main =
                    nil : LinkedList F64
                    nil = Nil

                    len nil
                "#
            ),
            0,
            i64
        );
    }

    #[test]
    fn linked_list_len_twice_0() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                LinkedList a : [ Nil, Cons a (LinkedList a) ]

                nil : LinkedList I64
                nil = Nil

                length : LinkedList a -> Int *
                length = \list ->
                    when list is
                        Nil -> 0
                        Cons _ rest -> 1 + length rest

                main =
                    length nil + length nil
                "#
            ),
            0,
            i64
        );
    }

    #[test]
    fn linked_list_len_1() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                LinkedList a : [ Nil, Cons a (LinkedList a) ]

                one : LinkedList (Int *)
                one = Cons 1 Nil

                length : LinkedList a -> Int *
                length = \list ->
                    when list is
                        Nil -> 0
                        Cons _ rest -> 1 + length rest

                main =
                    length one
                "#
            ),
            1,
            i64
        );
    }

    #[test]
    fn linked_list_len_twice_1() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                LinkedList a : [ Nil, Cons a (LinkedList a) ]

                one : LinkedList (Int *)
                one = Cons 1 Nil

                length : LinkedList a -> Int *
                length = \list ->
                    when list is
                        Nil -> 0
                        Cons _ rest -> 1 + length rest

                main =
                    length one + length one
                    "#
            ),
            2,
            i64
        );
    }

    #[test]
    fn linked_list_len_3() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                LinkedList a : [ Nil, Cons a (LinkedList a) ]

                three : LinkedList (Int *)
                three = Cons 3 (Cons 2 (Cons 1 Nil))

                length : LinkedList a -> Int *
                length = \list ->
                    when list is
                        Nil -> 0
                        Cons _ rest -> 1 + length rest


                main =
                    length three
                "#
            ),
            3,
            i64
        );
    }

    #[test]
    fn linked_list_sum_num_a() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                LinkedList a : [ Nil, Cons a (LinkedList a) ]

                three : LinkedList (Int *)
                three = Cons 3 (Cons 2 (Cons 1 Nil))


                sum : LinkedList (Num a) -> Num a
                sum = \list ->
                    when list is
                        Nil -> 0
                        Cons x rest -> x + sum rest

                main =
                    sum three
                "#
            ),
            3 + 2 + 1,
            i64
        )
    }

    #[test]
    fn linked_list_sum_int() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                LinkedList a : [ Nil, Cons a (LinkedList a) ]

                zero : LinkedList (Int *)
                zero = Nil

                sum : LinkedList (Int *) -> Int *
                sum = \list ->
                    when list is
                        Nil -> 0
                        Cons x rest -> x + sum rest

                main =
                    sum zero
                "#
            ),
            0,
            i64
        )
    }

    #[test]
    fn linked_list_map() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                LinkedList a : [ Nil, Cons a (LinkedList a) ]

                three : LinkedList (Int *)
                three = Cons 3 (Cons 2 (Cons 1 Nil))

                sum : LinkedList (Num a) -> Num a
                sum = \list ->
                    when list is
                        Nil -> 0
                        Cons x rest -> x + sum rest

                map : (a -> b), LinkedList a -> LinkedList b
                map = \f, list ->
                    when list is
                        Nil -> Nil
                        Cons x rest -> Cons (f x) (map f rest)

                main =
                    sum (map (\_ -> 1) three)
                "#
            ),
            3,
            i64
        );
    }

    #[test]
    fn when_nested_maybe() {
        assert_evals_to!(
            indoc!(
                r#"
                Maybe a : [ Nothing, Just a ]

                x : Maybe (Maybe (Int *))
                x = Just (Just 41)

                when x is
                    Just (Just v) -> v + 0x1
                    _ -> 0x1
                    "#
            ),
            42,
            i64
        );

        assert_evals_to!(
            indoc!(
                r#"
                Maybe a : [ Nothing, Just a ]

                x : Maybe (Maybe (Int *))
                x = Just Nothing

                when x is
                    Just (Just v) -> v + 0x1
                    Just Nothing -> 0x2
                    Nothing -> 0x1
                    "#
            ),
            2,
            i64
        );

        assert_evals_to!(
            indoc!(
                r#"
                Maybe a : [ Nothing, Just a ]

                x : Maybe (Maybe (Int *))
                x = Nothing

                when x is
                    Just (Just v) -> v + 0x1
                    Just Nothing -> 0x2
                    Nothing -> 0x1
                    "#
            ),
            1,
            i64
        );
    }

    #[test]
    fn when_peano() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                    Peano : [ S Peano, Z ]

                    three : Peano
                    three = S (S (S Z))

                    when three is
                        S (S _) -> 1
                        S (_) -> 2
                        Z -> 3
                    "#
            ),
            1,
            i64
        );

        assert_non_opt_evals_to!(
            indoc!(
                r#"
                    Peano : [ S Peano, Z ]

                    three : Peano
                    three = S Z

                    when three is
                        S (S _) -> 1
                        S (_) -> 2
                        Z -> 3
                    "#
            ),
            2,
            i64
        );

        assert_non_opt_evals_to!(
            indoc!(
                r#"
                    Peano : [ S Peano, Z ]

                    three : Peano
                    three = Z

                    when three is
                        S (S _) -> 1
                        S (_) -> 2
                        Z -> 3
                    "#
            ),
            3,
            i64
        );
    }

    #[test]
    #[should_panic(expected = "Roc failed with message: ")]
    fn undefined_variable() {
        assert_evals_to!(
            indoc!(
                r#"
                     if True then
                         x + z
                     else
                         y + z
                     "#
            ),
            3,
            i64
        );
    }

    #[test]
    #[should_panic(expected = "Roc failed with message: ")]
    fn annotation_without_body() {
        assert_evals_to!(
            indoc!(
                r#"
                foo : Int *


                foo
                "#
            ),
            3,
            i64
        );
    }

    #[test]
    fn closure() {
        assert_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                x = 42

                f = \{} -> x


                main =
                    f {}
                "#
            ),
            42,
            i64
        );
    }

    #[test]
    fn nested_closure() {
        assert_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                foo = \{} ->
                    x = 41
                    y = 1
                    f = \{} -> x + y
                    f

                main =
                    g = foo {}
                    g {}
                "#
            ),
            42,
            i64
        );
    }

    #[test]
    fn closure_in_list() {
        assert_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                foo = \{} ->
                    x = 41

                    f = \{} -> x

                    [ f ]

                main =
                    items = foo {}

                    List.len items
                "#
            ),
            1,
            i64
        );
    }

    #[test]
    fn specialize_closure() {
        use roc_std::RocList;

        assert_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                foo = \{} ->
                    x = 41
                    y = 1

                    f = \{} -> x
                    g = \{} -> x + y

                    [ f, g ]

                main =
                    items = foo {}

                    # List.len items
                    List.map items (\f -> f {})
                "#
            ),
            RocList::from_slice(&[41, 42]),
            RocList<i64>
        );
    }

    #[test]
    fn io_poc_effect() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                Effect a : [ @Effect ({} -> a) ]

                succeed : a -> Effect a
                succeed = \x -> @Effect \{} -> x

                runEffect : Effect a -> a
                runEffect = \@Effect thunk -> thunk {}

                foo : Effect (Float *)
                foo =
                    succeed 3.14

                main : Float *
                main =
                    runEffect foo

                "#
            ),
            3.14,
            f64
        );
    }

    #[test]
    fn io_poc_desugared() {
        assert_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                # succeed : a -> ({} -> a)
                succeed = \x -> \{} -> x

                foo : {} -> Float *
                foo =
                    succeed 3.14

                # runEffect : ({} ->  a) -> a
                runEffect = \thunk -> thunk {}

                main : Float *
                main =
                    runEffect foo
                "#
            ),
            3.14,
            f64
        );
    }

    #[test]
    fn return_wrapped_function_pointer() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                Effect a : [ @Effect ({} -> a) ]

                foo : Effect {}
                foo = @Effect \{} -> {}

                main : Effect {}
                main = foo
                "#
            ),
            1,
            i64,
            |_| 1
        );
    }

    #[test]
    fn return_wrapped_closure() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                Effect a : [ @Effect ({} -> a) ]

                foo : Effect {}
                foo =
                    x = 5

                    @Effect (\{} -> if x > 3 then {} else {})

                main : Effect {}
                main = foo
                "#
            ),
            1,
            i64,
            |_| 1
        );
    }

    #[test]
    fn linked_list_is_singleton() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                ConsList a : [ Cons a (ConsList a), Nil ]

                empty : ConsList a
                empty = Nil

                isSingleton : ConsList a -> Bool
                isSingleton = \list ->
                    when list is
                        Cons _ Nil ->
                            True

                        _ ->
                            False

                main : Bool
                main =
                    myList : ConsList I64
                    myList = empty

                    isSingleton myList
                "#
            ),
            false,
            bool
        );
    }

    #[test]
    fn linked_list_is_empty_1() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                ConsList a : [ Cons a (ConsList a), Nil ]

                empty : ConsList a
                empty = Nil

                isEmpty : ConsList a -> Bool
                isEmpty = \list ->
                    when list is
                        Cons _ _ ->
                            False

                        Nil ->
                            True

                main : Bool
                main =
                    myList : ConsList (Int *)
                    myList = empty

                    isEmpty myList
                "#
            ),
            true,
            bool
        );
    }

    #[test]
    fn linked_list_is_empty_2() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                ConsList a : [ Cons a (ConsList a), Nil ]

                isEmpty : ConsList a -> Bool
                isEmpty = \list ->
                    when list is
                        Cons _ _ ->
                            False

                        Nil ->
                            True

                main : Bool
                main =
                    myList : ConsList I64
                    myList = Cons 0x1 Nil

                    isEmpty myList
                "#
            ),
            false,
            bool
        );
    }

    #[test]
    fn linked_list_singleton() {
        // verifies only that valid llvm is produced
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                ConsList a : [ Cons a (ConsList a), Nil ]

                main : ConsList I64
                main = Cons 0x1 Nil
                "#
            ),
            0,
            i64,
            |_| 0
        );
    }

    #[test]
    fn recursive_functon_with_rigid() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                State a : { count : Int *, x : a }

                foo : State a -> Int *
                foo = \state ->
                    if state.count == 0 then
                        0
                    else
                        1 + foo { count: state.count - 1, x: state.x }

                main : Int *
                main =
                    foo { count: 3, x: {} }
                "#
            ),
            3,
            i64
        );
    }

    #[test]
    fn rbtree_insert() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                NodeColor : [ Red, Black ]

                RedBlackTree k v : [ Node NodeColor k v (RedBlackTree k v) (RedBlackTree k v), Empty ]

                Key k : Num k

                insert : Key k, v, RedBlackTree (Key k) v -> RedBlackTree (Key k) v
                insert = \key, value, dict ->
                    when insertHelp key value dict is
                        Node Red k v l r ->
                            Node Black k v l r

                        x ->
                            x

                insertHelp : (Key k), v, RedBlackTree (Key k) v -> RedBlackTree (Key k) v
                insertHelp = \key, value, dict ->
                  when dict is
                    Empty ->
                      # New nodes are always red. If it violates the rules, it will be fixed
                      # when balancing.
                      Node Red key value Empty Empty

                    Node nColor nKey nValue nLeft nRight ->
                      when Num.compare key nKey is
                        LT ->
                          balance nColor nKey nValue (insertHelp key value nLeft) nRight

                        EQ ->
                          Node nColor nKey value nLeft nRight

                        GT ->
                          balance nColor nKey nValue nLeft (insertHelp key value nRight)

                balance : NodeColor, k, v, RedBlackTree k v, RedBlackTree k v -> RedBlackTree k v
                balance = \color, key, value, left, right ->
                  when right is
                    Node Red rK rV rLeft rRight ->
                      when left is
                        Node Red lK lV lLeft lRight ->
                          Node
                            Red
                            key
                            value
                            (Node Black lK lV lLeft lRight)
                            (Node Black rK rV rLeft rRight)

                        _ ->
                          Node color rK rV (Node Red key value left rLeft) rRight

                    _ ->
                      when left is
                        Node Red lK lV (Node Red llK llV llLeft llRight) lRight ->
                          Node
                            Red
                            lK
                            lV
                            (Node Black llK llV llLeft llRight)
                            (Node Black key value lRight right)

                        _ ->
                          Node color key value left right

                show : RedBlackTree I64 {} -> Str
                show = \tree ->
                    when tree is
                        Empty -> "Empty"
                        Node _ _ _ _ _ -> "Node"


                main : Str
                main =
                    show (insert 0 {} Empty)
                "#
            ),
            RocStr::from_slice("Node".as_bytes()),
            RocStr
        );
    }

    #[test]
    fn rbtree_balance_3() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                RedBlackTree k : [ Node k (RedBlackTree k) (RedBlackTree k), Empty ]

                balance : k, RedBlackTree k -> RedBlackTree k
                balance = \key, left ->
                    Node key left Empty

                main : RedBlackTree (Int *)
                main =
                    balance 0 Empty
                "#
            ),
            false,
            *const i64,
            |x: *const i64| x.is_null()
        );
    }

    #[test]
    #[ignore]
    fn rbtree_layout_issue() {
        // there is a flex var in here somewhere that blows up layout creation
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                NodeColor : [ Red, Black ]

                RedBlackTree k v : [ Node NodeColor k v (RedBlackTree k v) (RedBlackTree k v), Empty ]

                # balance : NodeColor, k, v, RedBlackTree k v -> RedBlackTree k v
                balance = \color, key, value, right ->
                  when right is
                    Node Red _ _ rLeft rRight ->
                        Node color key value rLeft rRight


                    _ ->
                        Empty

                show : RedBlackTree * * -> Str
                show = \tree ->
                    when tree is
                        Empty -> "Empty"
                        Node _ _ _ _ _ -> "Node"

                zero : I64
                zero = 0

                main : Str
                main = show (balance Red zero zero Empty)
                "#
            ),
            RocStr::from_slice("Empty".as_bytes()),
            RocStr
        );
    }

    #[test]
    #[ignore]
    fn rbtree_balance_mono_problem() {
        // because of how the function is written, only `Red` is used and so in the function's
        // type, the first argument is a unit and dropped. Apparently something is weird with
        // constraint generation where the specialization required by `main` does not fix the
        // problem. As a result, the first argument is dropped and we run into issues down the line
        //
        // concretely, the `rRight` symbol will not be defined
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                NodeColor : [ Red, Black ]

                RedBlackTree k v : [ Node NodeColor k v (RedBlackTree k v) (RedBlackTree k v), Empty ]

                # balance : NodeColor, k, v, RedBlackTree k v, RedBlackTree k v -> RedBlackTree k v
                balance = \color, key, value, left, right ->
                  when right is
                    Node Red rK rV rLeft rRight ->
                      when left is
                        Node Red lK lV lLeft lRight ->
                          Node
                            Red
                            key
                            value
                            (Node Black lK lV lLeft lRight)
                            (Node Black rK rV rLeft rRight)

                        _ ->
                          Node color rK rV (Node Red key value left rLeft) rRight

                    _ ->
                        Empty

                show : RedBlackTree * * -> Str
                show = \tree ->
                    when tree is
                        Empty -> "Empty"
                        Node _ _ _ _ _ -> "Node"


                main : Str
                main = show (balance Red 0 0 Empty Empty)
                "#
            ),
            RocStr::from_slice("Empty".as_bytes()),
            RocStr
        );
    }

    #[test]
    fn rbtree_balance_full() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                NodeColor : [ Red, Black ]

                RedBlackTree k v : [ Node NodeColor k v (RedBlackTree k v) (RedBlackTree k v), Empty ]

                balance : NodeColor, k, v, RedBlackTree k v, RedBlackTree k v -> RedBlackTree k v
                balance = \color, key, value, left, right ->
                  when right is
                    Node Red rK rV rLeft rRight ->
                      when left is
                        Node Red lK lV lLeft lRight ->
                          Node
                            Red
                            key
                            value
                            (Node Black lK lV lLeft lRight)
                            (Node Black rK rV rLeft rRight)

                        _ ->
                          Node color rK rV (Node Red key value left rLeft) rRight

                    _ ->
                      when left is
                        Node Red lK lV (Node Red llK llV llLeft llRight) lRight ->
                          Node
                            Red
                            lK
                            lV
                            (Node Black llK llV llLeft llRight)
                            (Node Black key value lRight right)

                        _ ->
                          Node color key value left right

                main : RedBlackTree F64 F64
                main =
                    balance Red 0 0 Empty Empty
                "#
            ),
            false,
            *const i64,
            |x: *const i64| x.is_null()
        );
    }

    #[test]
    fn nested_pattern_match_two_ways() {
        // exposed an issue in the ordering of pattern match checks when ran with `--release` mode
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                ConsList a : [ Cons a (ConsList a), Nil ]

                balance : ConsList (Int *) -> Int *
                balance = \right ->
                  when right is
                    Cons 1 foo ->
                        when foo is
                            Cons 1 _ -> 3
                            _ -> 3
                    _ -> 3

                main : Int *
                main =
                    when balance Nil is
                        _ -> 3
                "#
            ),
            3,
            i64
        );

        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                ConsList a : [ Cons a (ConsList a), Nil ]

                balance : ConsList (Int *) -> Int *
                balance = \right ->
                  when right is
                    Cons 1 (Cons 1 _) -> 3
                    _ -> 3

                main : Int *
                main =
                    when balance Nil is
                        _ -> 3
                "#
            ),
            3,
            i64
        );
    }

    #[test]
    fn linked_list_guarded_double_pattern_match() {
        // the important part here is that the first case (with the nested Cons) does not match
        // TODO this also has undefined behavior
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                ConsList a : [ Cons a (ConsList a), Nil ]

                balance : ConsList (Int *) -> Int *
                balance = \right ->
                  when right is
                    Cons 1 foo ->
                        when foo is
                            Cons 1 _ -> 3
                            _ -> 3
                    _ -> 3

                main : Int *
                main =
                    when balance Nil is
                        _ -> 3
                "#
            ),
            3,
            i64
        );
    }

    #[test]
    fn linked_list_double_pattern_match() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                ConsList a : [ Cons a (ConsList a), Nil ]

                foo : ConsList (Int *) -> Int *
                foo = \list ->
                    when list is
                        Cons _ (Cons x _) -> x
                        _ -> 0

                main : Int *
                main =
                    foo (Cons 1 (Cons 32 Nil))
                "#
            ),
            32,
            i64
        );
    }

    #[test]
    fn binary_tree_double_pattern_match() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                BTree : [ Node BTree BTree, Leaf (Int *) ]

                foo : BTree -> Int *
                foo = \btree ->
                    when btree is
                        Node (Node (Leaf x) _) _ -> x
                        _ -> 0

                main : Int *
                main =
                    foo (Node (Node (Leaf 32) (Leaf 0)) (Leaf 0))
                "#
            ),
            32,
            i64
        );
    }

    #[test]
    fn unified_empty_closure() {
        // none of the Closure tags will have a payload
        // this was not handled correctly in the past
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                foo = \{} ->
                    when A is
                        A -> (\_ -> 3.14)
                        B -> (\_ -> 3.14)

                main : Float *
                main =
                    (foo {}) 0
                "#
            ),
            3.14,
            f64
        );
    }

    #[test]
    fn task_always_twice() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                Effect a : [ @Effect ({} -> a) ]

                effectAlways : a -> Effect a
                effectAlways = \x ->
                    inner = \{} -> x

                    @Effect inner

                effectAfter : Effect a, (a -> Effect b) -> Effect b
                effectAfter = \(@Effect thunk), transform -> transform (thunk {})

                Task a err : Effect (Result a err)

                always : a -> Task a *
                always = \x -> effectAlways (Ok x)

                fail : err -> Task * err
                fail = \x -> effectAlways (Err x)

                after : Task a err, (a -> Task b err) -> Task b err
                after = \task, transform ->
                    effectAfter task \res ->
                        when res is
                            Ok x -> transform x
                            Err e -> fail e

                main : Task {} (Float *)
                main = after (always "foo") (\_ -> always {})

                "#
            ),
            0,
            i64,
            |_| 0
        );
    }

    #[test]
    fn wildcard_rigid() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                Effect a : [ @Effect ({} -> a) ]

                Task a err : Effect (Result a err)

                # this failed because of the `*`, but worked with `err`
                always : a -> Task a *
                always = \x ->
                    inner = \{} -> (Ok x)

                    @Effect inner


                main : Task {} (Float *)
                main = always {}
                "#
            ),
            0,
            i64,
            |_| 0
        );
    }

    #[test]
    #[ignore]
    fn todo_bad_error_message() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                Effect a : [ @Effect ({} -> a) ]

                effectAlways : a -> Effect a
                effectAlways = \x ->
                    inner = \{} -> x

                    @Effect inner

                effectAfter : Effect a, (a -> Effect b) -> Effect b
                effectAfter = \(@Effect thunk), transform -> transform (thunk {})

                Task a err : Effect (Result a err)

                always : a -> Task a (Float *)
                always = \x -> effectAlways (Ok x)

                # the problem is that this restricts to `Task {} *`
                fail : err -> Task {} err
                fail = \x -> effectAlways (Err x)

                after : Task a err, (a -> Task b err) -> Task b err
                after = \task, transform ->
                    effectAfter task \res ->
                        when res is
                            Ok x -> transform x
                            # but here it must be `forall b. Task b {}`
                            Err e -> fail e

                main : Task {} (Float *)
                main =
                    after (always "foo") (\_ -> always {})
                "#
            ),
            0,
            i64,
            |_| 0
        );
    }

    #[test]
    fn hof_conditional() {
        // exposed issue with the if condition being just a symbol
        assert_evals_to!(
            indoc!(
                r#"
                    passTrue = \f -> f True

                    passTrue (\trueVal -> if trueVal then False else True)
                "#
            ),
            0,
            u8
        );
    }

    #[test]
    #[should_panic(
        expected = "Roc failed with message: \"Shadowing { original_region: |L 3-3, C 4-5|, shadow: |L 6-6, C 8-9| Ident(\\\"x\\\") }\""
    )]
    fn pattern_shadowing() {
        assert_evals_to!(
            indoc!(
                r#"
                x = 4

                when 4 is
                    x -> x
                "#
            ),
            0,
            i64
        );
    }

    #[test]
    #[should_panic(expected = "TODO non-exhaustive pattern")]
    fn non_exhaustive_pattern_let() {
        assert_evals_to!(
            indoc!(
                r#"
                x : Result (Int *) (Float *)
                x = Ok 4

                (Ok y) = x

                y
                "#
            ),
            0,
            i64
        );
    }

    #[test]
    #[ignore]
    #[should_panic(expected = "")]
    fn unsupported_pattern_str_interp() {
        assert_evals_to!(
            indoc!(
                r#"
                { x: 4 } = { x : 4 }

                x
                "#
            ),
            0,
            i64
        );
    }

    #[test]
    #[ignore]
    fn fingertree_basic() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                Some a : [ One a, Two a a, Three a a a ]

                Tuple a : [ Pair a a, Triple a a a ]

                # a FingerTree implementation
                Seq a : [ Nil, Unit a, More (Some a) (Seq (Tuple a)) (Some a) ]

                # cons : a, Seq a -> Seq a
                cons = \x, s ->
                    when s is
                        Nil -> Unit x
                        Unit y -> More (One x) Nil (One y)
                        More some q u ->
                            when some is
                                One y -> More (Two x y) q u
                                Two y z -> More (Three x y z) q u
                                Three y z w -> More (Two x y) (consTuple (Pair z w) q) u

                consTuple : Tuple a, Seq (Tuple a) -> Seq (Tuple a)
                consTuple = \a, b -> cons a b

                main : Bool
                main =
                    when cons 0x1 Nil is
                        Unit 1 -> True
                        _ -> False
                "#
            ),
            true,
            bool
        );
    }

    #[test]
    fn case_or_pattern() {
        // the `0` branch body should only be generated once in the future
        // it is currently duplicated
        assert_evals_to!(
            indoc!(
                r#"
                x : [ Red, Green, Blue ]
                x = Red

                when x is
                    Red | Green -> 0
                    Blue -> 1
                "#
            ),
            0,
            i64
        );
    }

    #[test]
    #[ignore]
    fn rosetree_basic() {
        assert_non_opt_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                Tree a : [ Tree a (List (Tree a)) ]

                singleton : a -> Tree a
                singleton = \x -> Tree x []

                main : Bool
                main =
                    x : Tree F64
                    x = singleton 3
                    when x is 
                        Tree 3.0 _ -> True
                        _ -> False
                "#
            ),
            true,
            bool
        );
    }

    #[test]
    fn case_jump() {
        // the decision tree will generate a jump to the `1` branch here
        assert_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                ConsList a : [ Cons a (ConsList a), Nil ]

                x : ConsList I64
                x = Nil

                main =
                    when Pair x x is
                        Pair Nil _ -> 1
                        Pair _ Nil -> 2
                        Pair (Cons a _) (Cons b _) -> a + b + 3
                "#
            ),
            1,
            i64
        );
    }

    #[test]
    fn nullable_eval_cfold() {
        // the decision tree will generate a jump to the `1` branch here
        assert_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                Expr : [ Var, Val I64, Add Expr Expr, Mul Expr Expr ]

                mkExpr : I64, I64 -> Expr
                mkExpr = \n , v ->
                    when n is
                        0 -> if v == 0 then Var else Val v
                        _ -> Add (mkExpr (n-1) (v+1)) (mkExpr (n-1) (max (v-1) 0))

                max : I64, I64 -> I64
                max = \a, b -> if a > b then a else b

                eval : Expr -> I64
                eval = \e ->
                    when e is
                        Var   -> 0
                        Val v -> v
                        Add l r -> eval l + eval r
                        Mul l r -> eval l * eval r

                main : I64
                main = eval (mkExpr 3 1)
                "#
            ),
            11,
            i64
        );
    }

    #[test]
    fn nested_switch() {
        // exposed bug with passing the right symbol/layout down into switch branch generation
        assert_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                Expr : [ ZAdd Expr Expr, Val I64, Var I64 ]

                eval : Expr -> I64
                eval = \e ->
                    when e is
                        Var _ -> 0
                        Val v -> v
                        ZAdd l r -> eval l + eval r

                constFolding : Expr -> Expr
                constFolding = \e ->
                    when e is
                        ZAdd e1 e2 ->
                            when Pair e1 e2 is
                                Pair (Val a) (Val b) -> Val (a+b)
                                Pair (Val a) (ZAdd x (Val b)) -> ZAdd (Val (a+b)) x
                                Pair _ _                     -> ZAdd e1 e2


                        _ -> e


                expr : Expr
                expr = ZAdd (Val 3) (ZAdd (Val 4) (Val 5))

                main : I64
                main = eval (constFolding expr)
                "#
            ),
            12,
            i64
        );
    }

    #[test]
    fn count_deriv_x() {
        // exposed bug with basing the block_of_memory on a specific (smaller) tag layout
        assert_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                Expr : [ Ln Expr, Pow Expr Expr, Var Str ]

                count : Expr -> I64
                count = \expr ->
                    when expr is
                        (Var _) -> 1
                        (Pow f g) -> count f + count g
                        (Ln f)    -> count f

                main : I64
                main = count (Var "x")
                "#
            ),
            1,
            i64
        );
    }

    #[test]
    fn deriv_pow() {
        // exposed bug with ordering of variable declarations before switch
        assert_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                Expr : [ Ln Expr, Pow Expr Expr, Var Str, Val I64 ]

                count : Expr -> I64
                count = \expr ->
                    when expr is
                        (Var _) -> 1
                        (Val n) -> n
                        (Pow f g) -> count f + count g
                        (Ln f)    -> count f

                pow : Expr, Expr -> Expr
                pow = \a,b ->
                    when Pair a b is
                        Pair (Val _) (Val _) -> Val -1
                        Pair _       (Val 0) -> Val 1
                        Pair f       (Val 1) -> f
                        Pair (Val 0) _       -> Val 0
                        Pair f       g       -> Pow f g

                main : I64
                main = count (pow (Var "x") (Var "x"))
                "#
            ),
            2,
            i64
        );
    }

    #[test]
    fn multiple_increment() {
        // the `leaf` value will be incremented multiple times at once
        assert_evals_to!(
            indoc!(
                r#"
                app "test" provides [ main ] to "./platform"

                Color : [ Red, Black ]

                Tree a b : [ Leaf, Node Color (Tree a b) a b (Tree a b) ]

                Map : Tree I64 Bool

                main : I64
                main =
                    leaf : Map
                    leaf = Leaf

                    m : Map
                    m = Node Black (Node Black leaf 10 False leaf) 11 False (Node Black leaf 12 False (Node Red leaf 13 False leaf))

                    when m is
                        Leaf -> 0
                        Node _ _ _ _ _ -> 1
                "#
            ),
            1,
            i64
        );
    }
}