// 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:convert';

import 'package:file/file.dart';
import 'package:file/memory.dart';
import 'package:flutter_tools/src/base/io.dart';
import 'package:flutter_tools/src/base/logger.dart';
import 'package:flutter_tools/src/base/os.dart';
import 'package:flutter_tools/src/base/platform.dart';
import 'package:flutter_tools/src/doctor.dart';
import 'package:flutter_tools/src/project.dart';
import 'package:flutter_tools/src/reporting/crash_reporting.dart';
import 'package:http/http.dart';
import 'package:http/testing.dart';
import 'package:test/fake.dart';
import 'package:unified_analytics/unified_analytics.dart';

import '../src/common.dart';
import '../src/fake_process_manager.dart';
import '../src/fakes.dart';

void main() {
  late BufferLogger logger;
  late MemoryFileSystem fs;
  late Platform platform;
  late OperatingSystemUtils operatingSystemUtils;
  late StackTrace stackTrace;
  late FakeAnalytics fakeAnalytics;

  setUp(() async {
    logger = BufferLogger.test();
    fs = MemoryFileSystem.test();
    fakeAnalytics = getInitializedFakeAnalyticsInstance(
      fs: fs,
      fakeFlutterVersion: FakeFlutterVersion(),
    );

    platform = FakePlatform(environment: <String, String>{});
    operatingSystemUtils = OperatingSystemUtils(
      fileSystem: fs,
      logger: logger,
      platform: platform,
      processManager: FakeProcessManager.any(),
    );

    MockCrashReportSender.sendCalls = 0;
    stackTrace = StackTrace.fromString('''
#0      _File.open.<anonymous closure> (dart:io/file_impl.dart:366:9)
#1      _rootRunUnary (dart:async/zone.dart:1141:38)''');
  });

  Future<void> verifyCrashReportSent(RequestInfo crashInfo, {
    int crashes = 1,
  }) async {
    // Verify that we sent the crash report.
    expect(crashInfo.method, 'POST');
    expect(crashInfo.uri, Uri(
      scheme: 'https',
      host: 'clients2.google.com',
      port: 443,
      path: '/cr/report',
      queryParameters: <String, String>{
        'product': 'Flutter_Tools',
        'version': 'test-version',
      },
    ));
    expect(crashInfo.fields?['uuid'], fakeAnalytics.clientId);
    expect(crashInfo.fields?['product'], 'Flutter_Tools');
    expect(crashInfo.fields?['version'], 'test-version');
    expect(crashInfo.fields?['osName'], 'linux');
    expect(crashInfo.fields?['osVersion'], 'Linux');
    expect(crashInfo.fields?['type'], 'DartError');
    expect(crashInfo.fields?['error_runtime_type'], 'StateError');
    expect(crashInfo.fields?['error_message'], 'Bad state: Test bad state error');
    expect(crashInfo.fields?['comments'], 'crash');

    expect(logger.traceText, contains('Sending crash report to Google.'));
    expect(logger.traceText, contains('Crash report sent (report ID: test-report-id)'));
  }

  testWithoutContext('CrashReporter.informUser provides basic instructions without PII', () async {
    final CrashReporter crashReporter = CrashReporter(
      fileSystem: fs,
      logger: logger,
      flutterProjectFactory: FlutterProjectFactory(fileSystem: fs, logger: logger),
    );

    final File file = fs.file('flutter_00.log');

    await crashReporter.informUser(
      CrashDetails(
        command: 'arg1 arg2 arg3',
        error: Exception('Dummy exception'),
        stackTrace: StackTrace.current,
        // Spaces are URL query encoded in the output, make it one word to make this test simpler.
        doctorText: FakeDoctorText('Ignored', 'NoPIIFakeDoctorText'),
      ),
      file,
    );

    expect(logger.statusText, contains('NoPIIFakeDoctorText'));
    expect(logger.statusText, isNot(contains('Ignored')));
    expect(logger.statusText, contains('https://github.com/flutter/flutter/issues/new'));
    expect(logger.errorText.trim(), 'A crash report has been written to ${file.path}');
  });

  testWithoutContext('suppress analytics', () async {
    fakeAnalytics.suppressTelemetry();

    final CrashReportSender crashReportSender = CrashReportSender(
      client: CrashingCrashReportSender(const SocketException('no internets')),
      platform: platform,
      logger: logger,
      operatingSystemUtils: operatingSystemUtils,
      analytics: fakeAnalytics,
    );

    await crashReportSender.sendReport(
      error: StateError('Test bad state error'),
      stackTrace: stackTrace,
      getFlutterVersion: () => 'test-version',
      command: 'crash',
    );

    expect(logger.traceText, isEmpty);
  });

  group('allow analytics', () {
    setUp(() async {
      await fakeAnalytics.setTelemetry(true);
    });

    testWithoutContext('should send crash reports', () async {
      final RequestInfo requestInfo = RequestInfo();

      final CrashReportSender crashReportSender = CrashReportSender(
        client: MockCrashReportSender(requestInfo),
        platform: platform,
        logger: logger,
        operatingSystemUtils: operatingSystemUtils,
        analytics: fakeAnalytics,
      );

      await crashReportSender.sendReport(
        error: StateError('Test bad state error'),
        stackTrace: stackTrace,
        getFlutterVersion: () => 'test-version',
        command: 'crash',
      );

      await verifyCrashReportSent(requestInfo);
    });

    testWithoutContext('should print an explanatory message when there is a SocketException', () async {
      final CrashReportSender crashReportSender = CrashReportSender(
        client: CrashingCrashReportSender(const SocketException('no internets')),
        platform: platform,
        logger: logger,
        operatingSystemUtils: operatingSystemUtils,
        analytics: fakeAnalytics,
      );

      await crashReportSender.sendReport(
        error: StateError('Test bad state error'),
        stackTrace: stackTrace,
        getFlutterVersion: () => 'test-version',
        command: 'crash',
      );

      expect(logger.errorText, contains('Failed to send crash report due to a network error'));
    });

    testWithoutContext('should print an explanatory message when there is an HttpException', () async {
      final CrashReportSender crashReportSender = CrashReportSender(
        client: CrashingCrashReportSender(const HttpException('no internets')),
        platform: platform,
        logger: logger,
        operatingSystemUtils: operatingSystemUtils,
        analytics: fakeAnalytics,
      );

      await crashReportSender.sendReport(
        error: StateError('Test bad state error'),
        stackTrace: stackTrace,
        getFlutterVersion: () => 'test-version',
        command: 'crash',
      );

      expect(logger.errorText, contains('Failed to send crash report due to a network error'));
    });

    testWithoutContext('should print an explanatory message when there is a ClientException', () async {
      final CrashReportSender crashReportSender = CrashReportSender(
        client: CrashingCrashReportSender(const HttpException('no internets')),
        platform: platform,
        logger: logger,
        operatingSystemUtils: operatingSystemUtils,
        analytics: fakeAnalytics,
      );

      await crashReportSender.sendReport(
        error: ClientException('Test bad state error'),
        stackTrace: stackTrace,
        getFlutterVersion: () => 'test-version',
        command: 'crash',
      );

      expect(logger.errorText, contains('Failed to send crash report due to a network error'));
    });

    testWithoutContext('should send only one crash report when sent many times', () async {
      final RequestInfo requestInfo = RequestInfo();

      final CrashReportSender crashReportSender = CrashReportSender(
        client: MockCrashReportSender(requestInfo),
        platform: platform,
        logger: logger,
        operatingSystemUtils: operatingSystemUtils,
        analytics: fakeAnalytics,
      );

      await crashReportSender.sendReport(
        error: StateError('Test bad state error'),
        stackTrace: stackTrace,
        getFlutterVersion: () => 'test-version',
        command: 'crash',
      );

      await crashReportSender.sendReport(
        error: StateError('Test bad state error'),
        stackTrace: stackTrace,
        getFlutterVersion: () => 'test-version',
        command: 'crash',
      );

      await crashReportSender.sendReport(
        error: StateError('Test bad state error'),
        stackTrace: stackTrace,
        getFlutterVersion: () => 'test-version',
        command: 'crash',
      );

      await crashReportSender.sendReport(
        error: StateError('Test bad state error'),
        stackTrace: stackTrace,
        getFlutterVersion: () => 'test-version',
        command: 'crash',
      );

      expect(MockCrashReportSender.sendCalls, 1);
      await verifyCrashReportSent(requestInfo, crashes: 4);
    });

    testWithoutContext('should not send a crash report if on a user-branch', () async {
      String? method;
      Uri? uri;

      final MockClient mockClient = MockClient((Request request) async {
        method = request.method;
        uri = request.url;

        return Response(
          'test-report-id',
          200,
        );
      });

      final CrashReportSender crashReportSender = CrashReportSender(
        client: mockClient,
        platform: platform,
        logger: logger,
        operatingSystemUtils: operatingSystemUtils,
        analytics: fakeAnalytics,
      );

      await crashReportSender.sendReport(
        error: StateError('Test bad state error'),
        stackTrace: stackTrace,
        getFlutterVersion: () => '[user-branch]/v1.2.3',
        command: 'crash',
      );

      // Verify that the report wasn't sent
      expect(method, null);
      expect(uri, null);

      expect(logger.traceText, isNot(contains('Crash report sent')));
    });

    testWithoutContext('can override base URL', () async {
      Uri? uri;
      final MockClient mockClient = MockClient((Request request) async {
        uri = request.url;
        return Response('test-report-id', 200);
      });

      final Platform environmentPlatform = FakePlatform(
        environment: <String, String>{
          'HOME': '/',
          'FLUTTER_CRASH_SERVER_BASE_URL': 'https://localhost:12345/fake_server',
        },
        script: Uri(scheme: 'data'),
      );

      final CrashReportSender crashReportSender = CrashReportSender(
        client: mockClient,
        platform: environmentPlatform,
        logger: logger,
        operatingSystemUtils: operatingSystemUtils,
        analytics: fakeAnalytics,
      );

      await crashReportSender.sendReport(
        error: StateError('Test bad state error'),
        stackTrace: stackTrace,
        getFlutterVersion: () => 'test-version',
        command: 'crash',
      );

      // Verify that we sent the crash report.
      expect(uri, isNotNull);
      expect(uri, Uri(
        scheme: 'https',
        host: 'localhost',
        port: 12345,
        path: '/fake_server',
        queryParameters: <String, String>{
          'product': 'Flutter_Tools',
          'version': 'test-version',
        },
      ));
    });
  });
}

class RequestInfo {
  String? method;
  Uri? uri;
  Map<String, String>? fields;
}

class MockCrashReportSender extends MockClient {
  MockCrashReportSender(RequestInfo crashInfo) : super((Request request) async {
    MockCrashReportSender.sendCalls++;
    crashInfo.method = request.method;
    crashInfo.uri = request.url;

    // A very ad-hoc multipart request parser. Good enough for this test.
    String? boundary = request.headers['Content-Type'];
    boundary = boundary?.substring(boundary.indexOf('boundary=') + 9);
    crashInfo.fields = Map<String, String>.fromIterable(
      utf8.decode(request.bodyBytes)
        .split('--$boundary')
        .map<List<String>?>((String part) {
        final Match? nameMatch = RegExp(r'name="(.*)"').firstMatch(part);
        if (nameMatch == null) {
          return null;
        }
        final String name = nameMatch[1]!;
        final String value = part.split('\n').skip(2).join('\n').trim();
        return <String>[name, value];
      }).whereType<List<String>>(),
      key: (dynamic key) {
        final List<String> pair = key as List<String>;
        return pair[0];
      },
      value: (dynamic value) {
        final List<String> pair = value as List<String>;
        return pair[1];
      },
    );

    return Response(
      'test-report-id',
      200,
    );
  });

  static int sendCalls = 0;
}

class CrashingCrashReportSender extends MockClient {
  CrashingCrashReportSender(Exception exception) : super((Request request) async {
    throw exception;
  });
}

class FakeDoctorText extends Fake implements DoctorText {
  FakeDoctorText(String text, String piiStrippedText)
      : _text = text, _piiStrippedText = piiStrippedText;

  @override
  Future<String> get text async => _text;
  final String _text;

  @override
  Future<String> get piiStrippedText async => _piiStrippedText;
  final String _piiStrippedText;
}