// Copyright (c) 2015, 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.

@TestOn('vm')
library;

import 'dart:async';

import 'package:path/path.dart' as p;
import 'package:test/test.dart';
import 'package:test_api/src/backend/compiler.dart';
import 'package:test_api/src/backend/runtime.dart';
import 'package:test_api/src/backend/state.dart';
import 'package:test_api/src/backend/test.dart';
import 'package:test_core/src/runner/compiler_selection.dart';
import 'package:test_core/src/runner/load_suite.dart';
import 'package:test_core/src/runner/loader.dart';
import 'package:test_core/src/runner/runner_suite.dart';
import 'package:test_core/src/runner/runner_test.dart';
import 'package:test_core/src/runner/suite.dart';
import 'package:test_descriptor/test_descriptor.dart' as d;

import '../utils.dart';

late Loader _loader;

final _tests = '''
import 'dart:async';

import 'package:test/test.dart';

void main() {
  test("success", () {});
  test("failure", () => throw TestFailure('oh no'));
  test("error", () => throw 'oh no');
}
''';

void main() {
  setUp(() async {
    _loader = Loader();
  });

  tearDown(() => _loader.close());

  group('.loadFile()', () {
    late RunnerSuite suite;
    group('with empty configuration', () {
      setUp(() async {
        await d.file('a_test.dart', _tests).create();
        var suites =
            await _loader
                .loadFile(
                  p.join(d.sandbox, 'a_test.dart'),
                  SuiteConfiguration.empty,
                )
                .toList();
        expect(suites, hasLength(1));
        var loadSuite = suites.first;
        suite = (await loadSuite.getSuite())!;
      });

      test('returns a suite with the file path and platform', () {
        expect(suite.path, equals(p.join(d.sandbox, 'a_test.dart')));
        expect(suite.platform.runtime, equals(Runtime.vm));
        expect(suite.platform.compiler, equals(Runtime.vm.defaultCompiler));
      });

      test('returns entries with the correct names and platforms', () {
        expect(suite.group.entries, hasLength(3));
        expect(suite.group.entries[0].name, equals('success'));
        expect(suite.group.entries[1].name, equals('failure'));
        expect(suite.group.entries[2].name, equals('error'));
      });

      test('can load and run a successful test', () {
        var liveTest = (suite.group.entries[0] as RunnerTest).load(suite);

        expectStates(liveTest, [
          const State(Status.running, Result.success),
          const State(Status.complete, Result.success),
        ]);
        expectErrors(liveTest, []);

        return liveTest.run().whenComplete(() => liveTest.close());
      });

      test('can load and run a failing test', () {
        var liveTest = (suite.group.entries[1] as RunnerTest).load(suite);
        expectSingleFailure(liveTest);
        return liveTest.run().whenComplete(() => liveTest.close());
      });
    });

    group('with compiler selection', () {
      Future<List<LoadSuite>> loadSuitesWithConfig(
        SuiteConfiguration suiteConfiguration,
      ) async {
        await d.file('a_test.dart', _tests).create();
        return _loader
            .loadFile(p.join(d.sandbox, 'a_test.dart'), suiteConfiguration)
            .toList();
      }

      test(
        'with a single compiler selection, uses the selected compiler',
        () async {
          var suites = await loadSuitesWithConfig(
            suiteConfiguration(
              compilerSelections: [CompilerSelection.parse('source')],
            ),
          );
          expect(suites, hasLength(1));
          var loadSuite = suites.first;
          suite = (await loadSuite.getSuite())!;
          expect(suite.path, equals(p.join(d.sandbox, 'a_test.dart')));
          expect(suite.platform.runtime, equals(Runtime.vm));
          expect(suite.platform.compiler, equals(Compiler.source));
        },
      );

      test(
        'with multiple compiler selections, returns a suite for each',
        () async {
          var suites = await loadSuitesWithConfig(
            suiteConfiguration(
              compilerSelections: [
                CompilerSelection.parse('source'),
                CompilerSelection.parse('kernel'),
              ],
            ),
          );

          expect(suites, hasLength(2));
          var runnerSuites = await Future.wait([
            for (var suite in suites) suite.getSuite(),
          ]);
          expect(
            runnerSuites,
            unorderedEquals([
              isA<RunnerSuite>()
                  .having(
                    (s) => s.platform.runtime,
                    'The vm runtime',
                    Runtime.vm,
                  )
                  .having(
                    (s) => s.platform.compiler,
                    'The source compiler',
                    Compiler.source,
                  ),
              isA<RunnerSuite>()
                  .having(
                    (s) => s.platform.runtime,
                    'The vm runtime',
                    Runtime.vm,
                  )
                  .having(
                    (s) => s.platform.compiler,
                    'The kernel compiler',
                    Compiler.kernel,
                  ),
            ]),
          );
        },
      );

      test(
        'with unsupported compiler selections, uses the default compiler',
        () async {
          var suites = await loadSuitesWithConfig(
            suiteConfiguration(
              compilerSelections: [CompilerSelection.parse('dart2js')],
            ),
          );
          expect(suites, hasLength(1));
          var loadSuite = suites.first;
          suite = (await loadSuite.getSuite())!;
          expect(suite.path, equals(p.join(d.sandbox, 'a_test.dart')));
          expect(suite.platform.runtime, equals(Runtime.vm));
          expect(suite.platform.compiler, equals(Runtime.vm.defaultCompiler));
        },
      );

      test('compiler selections support matching boolean selectors', () async {
        var suites = await loadSuitesWithConfig(
          suiteConfiguration(
            compilerSelections: [CompilerSelection.parse('vm:source')],
          ),
        );
        expect(suites, hasLength(1));
        var loadSuite = suites.first;
        suite = (await loadSuite.getSuite())!;
        expect(suite.path, equals(p.join(d.sandbox, 'a_test.dart')));
        expect(suite.platform.runtime, equals(Runtime.vm));
        expect(suite.platform.compiler, equals(Compiler.source));
      });

      test('compiler selections support unmatched boolean selectors', () async {
        var suites = await loadSuitesWithConfig(
          suiteConfiguration(
            compilerSelections: [CompilerSelection.parse('browser:source')],
          ),
        );
        expect(suites, hasLength(1));
        var loadSuite = suites.first;
        suite = (await loadSuite.getSuite())!;
        expect(suite.path, equals(p.join(d.sandbox, 'a_test.dart')));
        expect(suite.platform.runtime, equals(Runtime.vm));
        expect(
          suite.platform.compiler,
          allOf(Runtime.vm.defaultCompiler, isNot(Compiler.source)),
        );
      });
    });
  });

  group('.loadDir()', () {
    test('ignores non-Dart files', () async {
      await d.file('a_test.txt', _tests).create();
      expect(
        _loader.loadDir(d.sandbox, SuiteConfiguration.empty).toList(),
        completion(isEmpty),
      );
    });

    test("ignores files that don't end in _test.dart", () async {
      await d.file('test.dart', _tests).create();
      expect(
        _loader.loadDir(d.sandbox, SuiteConfiguration.empty).toList(),
        completion(isEmpty),
      );
    });

    group('with suites loaded from a directory', () {
      late List<RunnerSuite> suites;
      setUp(() async {
        await d.file('a_test.dart', _tests).create();
        await d.file('another_test.dart', _tests).create();
        await d.dir('dir', [d.file('sub_test.dart', _tests)]).create();

        suites =
            await _loader
                .loadDir(d.sandbox, SuiteConfiguration.empty)
                .asyncMap((loadSuite) async => (await loadSuite.getSuite())!)
                .toList();
      });

      test('gives those suites the correct paths', () {
        expect(
          suites.map((suite) => suite.path),
          unorderedEquals([
            p.join(d.sandbox, 'a_test.dart'),
            p.join(d.sandbox, 'another_test.dart'),
            p.join(d.sandbox, 'dir', 'sub_test.dart'),
          ]),
        );
      });

      test('can run tests in those suites', () {
        var suite = suites.firstWhere(
          (suite) => suite.path!.contains('a_test'),
        );
        var liveTest = (suite.group.entries[1] as RunnerTest).load(suite);
        expectSingleFailure(liveTest);
        return liveTest.run().whenComplete(() => liveTest.close());
      });
    });
  });

  test('a print in a loaded file is piped through the LoadSuite', () async {
    await d.file('a_test.dart', '''
      void main() {
        print('print within test');
      }
    ''').create();
    var suites =
        await _loader
            .loadFile(
              p.join(d.sandbox, 'a_test.dart'),
              SuiteConfiguration.empty,
            )
            .toList();
    expect(suites, hasLength(1));
    var loadSuite = suites.first;

    var liveTest = (loadSuite.group.entries.single as Test).load(loadSuite);
    expect(
      liveTest.onMessage.first.then((message) => message.text),
      completion(equals('print within test')),
    );
    await liveTest.run();
    expectTestPassed(liveTest);
  });

  group('LoadException', () {
    test('suites can be retried', () async {
      var numRetries = 5;

      await d.file('a_test.dart', '''
      import 'hello.dart';

      void main() {}
    ''').create();

      var firstFailureCompleter = Completer<void>();

      // After the first load failure we create the missing dependency.
      unawaited(
        firstFailureCompleter.future.then((_) async {
          await d.file('hello.dart', '''
      String get message => 'hello';
    ''').create();
        }),
      );

      await runZoned(
        () async {
          var suites =
              await _loader
                  .loadFile(
                    p.join(d.sandbox, 'a_test.dart'),
                    suiteConfiguration(retry: numRetries),
                  )
                  .toList();
          expect(suites, hasLength(1));
          var loadSuite = suites.first;
          var suite = (await loadSuite.getSuite())!;
          expect(suite.path, equals(p.join(d.sandbox, 'a_test.dart')));
          expect(suite.platform.runtime, equals(Runtime.vm));
        },
        zoneSpecification: ZoneSpecification(
          print: (_, parent, zone, message) {
            if (message.contains('Retrying load of') &&
                !firstFailureCompleter.isCompleted) {
              firstFailureCompleter.complete(null);
            }
            parent.print(zone, message);
          },
        ),
      );

      expect(firstFailureCompleter.isCompleted, true);
    });
  });

  // TODO: Test load suites. Don't forget to test that prints in loaded files
  // are piped through the suite. Also for browser tests!
}