// Copyright 2016 Dart Mockito authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import 'dart:async';

import 'package:mockito/mockito.dart';
import 'package:test/test.dart';

import 'utils.dart';

class _RealClass {
  _RealClass innerObj;
  String methodWithoutArgs() => 'Real';
  String methodWithNormalArgs(int x) => 'Real';
  String methodWithListArgs(List<int> x) => 'Real';
  String methodWithPositionalArgs(int x, [int y]) => 'Real';
  String methodWithNamedArgs(int x, {int y}) => 'Real';
  String methodWithTwoNamedArgs(int x, {int y, int z}) => 'Real';
  String methodWithObjArgs(_RealClass x) => 'Real';
  Future<String> methodReturningFuture() => Future.value('Real');
  Stream<String> methodReturningStream() => Stream.fromIterable(['Real']);
  String get getter => 'Real';
}

abstract class _Foo {
  String bar();
}

abstract class _AbstractFoo implements _Foo {
  @override
  String bar() => baz();

  String baz();

  String quux() => 'Real';
}

class _MockFoo extends _AbstractFoo with Mock {}

class _MockedClass extends Mock implements _RealClass {}

void expectFail(String expectedMessage, void Function() expectedToFail) {
  try {
    expectedToFail();
    fail('It was expected to fail!');
  } catch (e) {
    if (!(e is TestFailure)) {
      rethrow;
    } else {
      if (expectedMessage != e.message) {
        throw TestFailure('Failed, but with wrong message: ${e.message}');
      }
    }
  }
}

String noMatchingCallsFooter = '(If you called `verify(...).called(0);`, '
    'please instead use `verifyNever(...);`.)';

void main() {
  _MockedClass mock;

  var isNsmForwarding = assessNsmForwarding();

  setUp(() {
    mock = _MockedClass();
  });

  tearDown(() {
    // In some of the tests that expect an Error to be thrown, Mockito's
    // global state can become invalid. Reset it.
    resetMockitoState();
  });

  group('mixin support', () {
    test('should work', () {
      var foo = _MockFoo();
      when(foo.baz()).thenReturn('baz');
      expect(foo.bar(), 'baz');
    });
  });

  group('when()', () {
    test('should mock method without args', () {
      when(mock.methodWithoutArgs()).thenReturn('A');
      expect(mock.methodWithoutArgs(), equals('A'));
    });

    test('should mock method with normal args', () {
      when(mock.methodWithNormalArgs(42)).thenReturn('Ultimate Answer');
      expect(mock.methodWithNormalArgs(43), isNull);
      expect(mock.methodWithNormalArgs(42), equals('Ultimate Answer'));
    });

    test('should mock method with mock args', () {
      var m1 = _MockedClass();
      when(mock.methodWithObjArgs(m1)).thenReturn('Ultimate Answer');
      expect(mock.methodWithObjArgs(_MockedClass()), isNull);
      expect(mock.methodWithObjArgs(m1), equals('Ultimate Answer'));
    });

    test('should mock method with positional args', () {
      when(mock.methodWithPositionalArgs(42, 17)).thenReturn('Answer and...');
      expect(mock.methodWithPositionalArgs(42), isNull);
      expect(mock.methodWithPositionalArgs(42, 18), isNull);
      expect(mock.methodWithPositionalArgs(42, 17), equals('Answer and...'));
    });

    test('should mock method with named args', () {
      when(mock.methodWithNamedArgs(42, y: 17)).thenReturn('Why answer?');
      expect(mock.methodWithNamedArgs(42), isNull);
      expect(mock.methodWithNamedArgs(42, y: 18), isNull);
      expect(mock.methodWithNamedArgs(42, y: 17), equals('Why answer?'));
    });

    test('should mock method with List args', () {
      when(mock.methodWithListArgs([42])).thenReturn('Ultimate answer');
      expect(mock.methodWithListArgs([43]), isNull);
      expect(mock.methodWithListArgs([42]), equals('Ultimate answer'));
    });

    test('should mock method with argument matcher', () {
      when(mock.methodWithNormalArgs(argThat(greaterThan(100))))
          .thenReturn('A lot!');
      expect(mock.methodWithNormalArgs(100), isNull);
      expect(mock.methodWithNormalArgs(101), equals('A lot!'));
    });

    test('should mock method with any argument matcher', () {
      when(mock.methodWithNormalArgs(any)).thenReturn('A lot!');
      expect(mock.methodWithNormalArgs(100), equals('A lot!'));
      expect(mock.methodWithNormalArgs(101), equals('A lot!'));
    });

    test('should mock method with any list argument matcher', () {
      when(mock.methodWithListArgs(any)).thenReturn('A lot!');
      expect(mock.methodWithListArgs([42]), equals('A lot!'));
      expect(mock.methodWithListArgs([43]), equals('A lot!'));
    });

    test('should mock method with multiple named args and matchers', () {
      when(mock.methodWithTwoNamedArgs(any, y: anyNamed('y')))
          .thenReturn('x y');
      when(mock.methodWithTwoNamedArgs(any, z: anyNamed('z')))
          .thenReturn('x z');
      if (isNsmForwarding) {
        expect(mock.methodWithTwoNamedArgs(42), 'x z');
      } else {
        expect(mock.methodWithTwoNamedArgs(42), isNull);
      }
      expect(mock.methodWithTwoNamedArgs(42, y: 18), equals('x y'));
      expect(mock.methodWithTwoNamedArgs(42, z: 17), equals('x z'));
      expect(mock.methodWithTwoNamedArgs(42, y: 18, z: 17), isNull);
      when(mock.methodWithTwoNamedArgs(any, y: anyNamed('y'), z: anyNamed('z')))
          .thenReturn('x y z');
      expect(mock.methodWithTwoNamedArgs(42, y: 18, z: 17), equals('x y z'));
    });

    test('should mock method with mix of argument matchers and real things',
        () {
      when(mock.methodWithPositionalArgs(argThat(greaterThan(100)), 17))
          .thenReturn('A lot with 17');
      expect(mock.methodWithPositionalArgs(100, 17), isNull);
      expect(mock.methodWithPositionalArgs(101, 18), isNull);
      expect(mock.methodWithPositionalArgs(101, 17), equals('A lot with 17'));
    });

    test('should mock getter', () {
      when(mock.getter).thenReturn('A');
      expect(mock.getter, equals('A'));
    });

    test('should have hashCode when it is not mocked', () {
      expect(mock.hashCode, isNotNull);
    });

    test('should have default toString when it is not mocked', () {
      expect(mock.toString(), equals('_MockedClass'));
    });

    test('should use identical equality between it is not mocked', () {
      var anotherMock = _MockedClass();
      expect(mock == anotherMock, isFalse);
      expect(mock == mock, isTrue);
    });

    test('should mock method with thrown result', () {
      when(mock.methodWithNormalArgs(any)).thenThrow(StateError('Boo'));
      expect(() => mock.methodWithNormalArgs(42), throwsStateError);
    });

    test('should mock method with calculated result', () {
      when(mock.methodWithNormalArgs(any)).thenAnswer(
          (Invocation inv) => inv.positionalArguments[0].toString());
      expect(mock.methodWithNormalArgs(43), equals('43'));
      expect(mock.methodWithNormalArgs(42), equals('42'));
    });

    test('should return mock to make simple oneline mocks', () {
      _RealClass mockWithSetup = _MockedClass();
      when(mockWithSetup.methodWithoutArgs()).thenReturn('oneline');
      expect(mockWithSetup.methodWithoutArgs(), equals('oneline'));
    });

    test('should use latest matching when definition', () {
      when(mock.methodWithoutArgs()).thenReturn('A');
      when(mock.methodWithoutArgs()).thenReturn('B');
      expect(mock.methodWithoutArgs(), equals('B'));
    });

    test('should mock method with calculated result', () {
      when(mock.methodWithNormalArgs(argThat(equals(43)))).thenReturn('43');
      when(mock.methodWithNormalArgs(argThat(equals(42)))).thenReturn('42');
      expect(mock.methodWithNormalArgs(43), equals('43'));
    });

    // Error path tests.
    test('should throw if `when` is called while stubbing', () {
      expect(() {
        var responseHelper = () {
          var mock2 = _MockedClass();
          when(mock2.getter).thenReturn('A');
          return mock2;
        };
        when(mock.innerObj).thenReturn(responseHelper());
      }, throwsStateError);
    });

    test('thenReturn throws if provided Future', () {
      expect(
          () => when(mock.methodReturningFuture())
              .thenReturn(Future.value('stub')),
          throwsArgumentError);
    });

    test('thenReturn throws if provided Stream', () {
      expect(
          () => when(mock.methodReturningStream())
              .thenReturn(Stream.fromIterable(['stub'])),
          throwsArgumentError);
    });

    test('thenAnswer supports stubbing method returning a Future', () async {
      when(mock.methodReturningFuture())
          .thenAnswer((_) => Future.value('stub'));

      expect(await mock.methodReturningFuture(), 'stub');
    });

    test('thenAnswer supports stubbing method returning a Stream', () async {
      when(mock.methodReturningStream())
          .thenAnswer((_) => Stream.fromIterable(['stub']));

      expect(await mock.methodReturningStream().toList(), ['stub']);
    });

    test('should throw if named matcher is passed as the wrong name', () {
      expect(() {
        when(mock.methodWithNamedArgs(argThat(equals(42)), y: anyNamed('z')))
            .thenReturn('99');
      }, throwsArgumentError);
    });

    test('should throw if attempting to stub a real method', () {
      var foo = _MockFoo();
      expect(() {
        when(foo.quux()).thenReturn('Stub');
      }, throwsStateError);
    });
  });

  group('throwOnMissingStub', () {
    test('should throw when a mock was called without a matching stub', () {
      throwOnMissingStub(mock);
      when(mock.methodWithNormalArgs(42)).thenReturn('Ultimate Answer');
      expect(
        () => (mock).methodWithoutArgs(),
        throwsNoSuchMethodError,
      );
    });

    test('should not throw when a mock was called with a matching stub', () {
      throwOnMissingStub(mock);
      when(mock.methodWithoutArgs()).thenReturn('A');
      expect(() => mock.methodWithoutArgs(), returnsNormally);
    });
  });

  test(
      'reports an error when using an argument matcher outside of stubbing or '
      'verification', () {
    expect(() => mock.methodWithNormalArgs(any), throwsArgumentError);
  });

  test(
      'reports an error when using an argument matcher in a position other '
      'than an argument for the stubbed method', () {
    expect(() => when(mock.methodWithListArgs(List.filled(7, any))),
        throwsArgumentError);
  });
}