// RUN: %empty-directory(%t)

// RUN: %target-swift-frontend %s -enable-library-evolution -module-name Enums -clang-header-expose-decls=all-public -typecheck -verify -emit-clang-header-path %t/enums.h
// RUN: %FileCheck --check-prefixes=CHECK,OLD_CASE %s < %t/enums.h

// RUN: %target-swift-frontend %s -enable-library-evolution -D NEW_CASE -module-name Enums -clang-header-expose-decls=all-public -typecheck -verify -emit-clang-header-path %t/enums_new_case.h
// RUN: %FileCheck --check-prefixes=CHECK,NEW_CASE %s < %t/enums_new_case.h

// RUN: %check-interop-cxx-header-in-clang(%t/enums.h -Wno-unused-private-field -Wno-unused-function -DSWIFT_CXX_INTEROP_HIDE_STL_OVERLAY)
// RUN: %check-interop-cxx-header-in-clang(%t/enums_new_case.h -Wno-unused-private-field -Wno-unused-function -DSWIFT_CXX_INTEROP_HIDE_STL_OVERLAY)

public enum Foo {
    case a(Double)
#if NEW_CASE
    case b(Int)
#endif
}

public func makeFoo(_ x: Int) -> Foo {
#if NEW_CASE
    if x >= 0 {
        return .b(x)
    } else {
        return .a(Double(x))
    }
#else
    return .a(Double(x))
#endif
}

public func printFoo(_ x: Foo) {
    print(x)
}

public enum Empty {

}

// CHECK:         // Tags for resilient enum Empty
// CHECK-NEXT:    extern "C" {
// CHECK-NEXT:    }
// CHECK-EMPTY:
// CHECK-NEXT:    } // namespace _impl
// CHECK-EMPTY:
// CHECK-NEXT:    class SWIFT_SYMBOL("s:5Enums5EmptyO") Empty final {
// CHECK:         enum class cases {
// CHECK-NEXT:      unknownDefault
// CHECK-NEXT:    };
// CHECK:         inline const static struct _impl_unknownDefault {  // impl struct for case unknownDefault
// CHECK-NEXT:      SWIFT_INLINE_THUNK constexpr operator cases() const {
// CHECK-NEXT:        return cases::unknownDefault;
// CHECK-NEXT:      }
// CHECK-NEXT:    } unknownDefault;
// CHECK-NEXT:    SWIFT_INLINE_THUNK bool isUnknownDefault() const;
// CHECK:         SWIFT_INLINE_THUNK operator cases() const {
// CHECK-NEXT:      return cases::unknownDefault;
// CHECK-NEXT:    }
// CHECK:         // Tags for resilient enum Foo
// CHECK-NEXT:    extern "C" {
// CHECK-NEXT:    extern unsigned $s5Enums3FooO1ayACSdcACmFWC;
// NEW_CASE-NEXT: extern unsigned $s5Enums3FooO1byACSicACmFWC;
// CHECK-NEXT:    }
// CHECK-EMPTY:
// CHECK-NEXT:    } // namespace _impl
// CHECK-EMPTY:
// CHECK-NEXT:    class SWIFT_SYMBOL("s:5Enums3FooO") Foo final {
// CHECK-NEXT:    public:
// CHECK:         enum class cases {
// CHECK-NEXT:      a SWIFT_SYMBOL("s:5Enums3FooO1ayACSdcACmF"),
// NEW_CASE-NEXT:   b SWIFT_SYMBOL("s:5Enums3FooO1byACSicACmF"),
// CHECK-NEXT:      unknownDefault
// CHECK-NEXT:    }
// CHECK:         inline const static struct _impl_unknownDefault {  // impl struct for case unknownDefault
// CHECK-NEXT:      SWIFT_INLINE_THUNK constexpr operator cases() const {
// CHECK-NEXT:        return cases::unknownDefault;
// CHECK-NEXT:      }
// CHECK-NEXT:    } unknownDefault;
// CHECK-NEXT:    SWIFT_INLINE_THUNK bool isUnknownDefault() const;
// CHECK-EMPTY:
// CHECK:         SWIFT_INLINE_THUNK operator cases() const {
// CHECK-NEXT:      auto tag = _getEnumTag();
// CHECK-NEXT:      if (tag == _impl::$s5Enums3FooO1ayACSdcACmFWC) return cases::a;
// NEW_CASE-NEXT:   if (tag == _impl::$s5Enums3FooO1byACSicACmFWC) return cases::b;
// CHECK-NEXT:      return cases::unknownDefault;
// CHECK-NEXT:    }
// CHECK:         SWIFT_INLINE_THUNK Foo Foo::_impl_a::operator()(double val) const {
// CHECK-NEXT:      auto result = Foo::_make();
// CHECK-NEXT:      memcpy(result._getOpaquePointer(), &val, sizeof(val));
// CHECK-NEXT:      result._destructiveInjectEnumTag(_impl::$s5Enums3FooO1ayACSdcACmFWC);
// CHECK-NEXT:      return result;
// CHECK-NEXT:    }
// NEW_CASE:      SWIFT_INLINE_THUNK Foo Foo::_impl_b::operator()(swift::Int val) const {
// NEW_CASE-NEXT:   auto result = Foo::_make();
// NEW_CASE-NEXT:   memcpy(result._getOpaquePointer(), &val, sizeof(val));
// NEW_CASE-NEXT:   result._destructiveInjectEnumTag(_impl::$s5Enums3FooO1byACSicACmFWC);
// NEW_CASE-NEXT:   return result;
// NEW_CASE-NEXT: }