// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:ffi';

import 'dylib_utils.dart';

import "package:expect/expect.dart";

final ffiTestFunctions = dlopenPlatformSpecific("ffi_test_functions");

typedef NativeCallbackTest = Int32 Function(Pointer);
typedef NativeCallbackTestFn = int Function(Pointer);

class CallbackTest {
  final String name;
  final void Function() afterCallbackChecks;
  final bool isLeaf;

  // Either a NativeCallable or a Pointer.fromFunction.
  final Object callback;

  CallbackTest(this.name, this.callback, {this.isLeaf = false})
    : afterCallbackChecks = noChecks {}
  CallbackTest.withCheck(
    this.name,
    this.callback,
    this.afterCallbackChecks, {
    this.isLeaf = false,
  }) {}

  void run() {
    final NativeCallbackTestFn tester = isLeaf
        ? ffiTestFunctions
              .lookupFunction<NativeCallbackTest, NativeCallbackTestFn>(
                "Test$name",
                isLeaf: true,
              )
        : ffiTestFunctions
              .lookupFunction<NativeCallbackTest, NativeCallbackTestFn>(
                "Test$name",
                isLeaf: false,
              );

    final cb = callback;
    final int testCode = tester(
      cb is NativeCallable ? cb.nativeFunction : cb as Pointer,
    );

    if (testCode != 0) {
      Expect.fail("Test $name failed.");
    }

    afterCallbackChecks();
    if (cb is NativeCallable) {
      cb.close();
    }
  }
}

void noChecks() {}