// Copyright 2014 The Flutter Authors. 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:async';
import 'dart:io';

import 'package:file/file.dart';
import 'package:file/memory.dart';
import 'package:flutter_tools/src/base/context.dart';
import 'package:flutter_tools/src/base/file_system.dart';
import 'package:flutter_tools/src/base/error_handling_file_system.dart';
import 'package:flutter_tools/src/base/process.dart';
import 'package:flutter_tools/src/globals.dart' as globals;

import '../src/common.dart';
import '../src/context.dart';
import '../src/testbed.dart';

void main() {
  group('Testbed', () {

    test('Can provide default interfaces', () async {
      final Testbed testbed = Testbed();

      FileSystem localFileSystem;
      await testbed.run(() {
        localFileSystem = globals.fs;
      });

      expect(localFileSystem, isA<ErrorHandlingFileSystem>());
      expect((localFileSystem as ErrorHandlingFileSystem).fileSystem,
             isA<MemoryFileSystem>());
    });

    test('Can provide setup interfaces', () async {
      final Testbed testbed = Testbed(overrides: <Type, Generator>{
        A: () => A(),
      });

      A instance;
      await testbed.run(() {
        instance = context.get<A>();
      });

      expect(instance, isA<A>());
    });

    test('Can provide local overrides', () async {
      final Testbed testbed = Testbed(overrides: <Type, Generator>{
        A: () => A(),
      });

      A instance;
      await testbed.run(() {
        instance = context.get<A>();
      }, overrides: <Type, Generator>{
        A: () => B(),
      });

      expect(instance, isA<B>());
    });

    test('provides a mocked http client', () async {
      final Testbed testbed = Testbed();
      await testbed.run(() async {
        final HttpClient client = HttpClient();
        final HttpClientRequest request = await client.getUrl(null);
        final HttpClientResponse response = await request.close();

        expect(response.statusCode, HttpStatus.badRequest);
        expect(response.contentLength, 0);
      });
    });

    test('Throws StateError if Timer is left pending', () async {
      final Testbed testbed = Testbed();

      expect(testbed.run(() async {
        Timer.periodic(const Duration(seconds: 1), (Timer timer) { });
      }), throwsStateError);
    });

    test('Doesnt throw a StateError if Timer is left cleaned up', () async {
      final Testbed testbed = Testbed();

      await testbed.run(() async {
        final Timer timer = Timer.periodic(const Duration(seconds: 1), (Timer timer) { });
        timer.cancel();
      });
    });

    test('Throws if ProcessUtils is injected',() {
      final Testbed testbed = Testbed(overrides: <Type, Generator>{
        ProcessUtils: () => null,
      });

      expect(() => testbed.run(() {}), throwsA(isInstanceOf<StateError>()));
    });
  });
}

class A {}

class B extends A {}