// Copyright 2020 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:io';

import 'package:file/file.dart';
import 'package:file/memory.dart';
import 'package:process_runner/process_runner.dart';
import 'package:process_runner/test/fake_process_manager.dart';
import 'package:test/test.dart';

void main() {
  late FileSystem fs;
  late FakeProcessManager fakeProcessManager;
  late ProcessRunner processRunner;
  late ProcessPool processPool;
  final testPath = Platform.isWindows ? r'C:\tmp\foo' : '/tmp/foo';

  setUp(() {
    fakeProcessManager = FakeProcessManager((String value) {});
    fs = MemoryFileSystem(
        style: Platform.isWindows
            ? FileSystemStyle.windows
            : FileSystemStyle.posix);
    processRunner = ProcessRunner(
      processManager: fakeProcessManager,
      defaultWorkingDirectory: fs.directory(testPath),
    );
    processPool = ProcessPool(processRunner: processRunner, printReport: null);
  });

  test('startWorkers works', () async {
    final calls = <FakeInvocationRecord, List<ProcessResult>>{
      FakeInvocationRecord(<String>['command', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'output1', ''),
      ],
    };
    fakeProcessManager.fakeResults = calls;
    final jobs = <WorkerJob>[
      WorkerJob(<String>['command', 'arg1', 'arg2'], name: 'job 1'),
    ];
    await for (final WorkerJob _ in processPool.startWorkers(jobs)) {}
    fakeProcessManager.verifyCalls(calls.keys);
  });
  test('runToCompletion works', () async {
    final calls = <FakeInvocationRecord, List<ProcessResult>>{
      FakeInvocationRecord(<String>['command', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'output1', ''),
      ],
    };
    fakeProcessManager.fakeResults = calls;
    final jobs = <WorkerJob>[
      WorkerJob(<String>['command', 'arg1', 'arg2'], name: 'job 1'),
    ];
    await processPool.runToCompletion(jobs);
    fakeProcessManager.verifyCalls(calls.keys);
  });
  test('failed tests report results', () async {
    final calls = <FakeInvocationRecord, List<ProcessResult>>{
      FakeInvocationRecord(<String>['command', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, -1, 'output1', 'stderr1'),
      ],
    };
    fakeProcessManager.fakeResults = calls;
    final jobs = <WorkerJob>[
      WorkerJob(<String>['command', 'arg1', 'arg2'], name: 'job 1'),
    ];
    final completed = await processPool.runToCompletion(jobs);
    expect(completed.first.result.exitCode, equals(-1));
    expect(completed.first.result.stdout, equals('output1'));
    expect(completed.first.result.stderr, equals('stderr1'));
    expect(completed.first.result.output, equals('output1stderr1'));
  });
  test('failed tests throw when failOk is false', () async {
    final calls = <FakeInvocationRecord, List<ProcessResult>>{
      FakeInvocationRecord(<String>['command', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, -1, 'output1', 'stderr1'),
      ],
    };
    fakeProcessManager.fakeResults = calls;
    final jobs = <WorkerJob>[
      WorkerJob(<String>['command', 'arg1', 'arg2'],
          name: 'job 1', failOk: false),
    ];
    expect(() async {
      await processPool.runToCompletion(jobs);
    }, throwsException);
  });
  test('Commands that throw exceptions report results', () async {
    fakeProcessManager =
        FakeProcessManager((String value) {}, commandsThrow: true);
    processRunner = ProcessRunner(processManager: fakeProcessManager);
    processPool = ProcessPool(processRunner: processRunner, printReport: null);
    final calls = <FakeInvocationRecord, List<ProcessResult>>{
      FakeInvocationRecord(<String>['command', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, -1, 'output1', 'stderr1'),
      ],
    };
    fakeProcessManager.fakeResults = calls;
    final jobs = <WorkerJob>[
      WorkerJob(<String>['command', 'arg1', 'arg2'], name: 'job 1'),
    ];
    final completed = await processPool.runToCompletion(jobs);
    expect(completed.first.result, equals(ProcessRunnerResult.failed));
    expect(completed.first.exception, isNotNull);
  });

  test('Commands in task groups run in order, but parallel with other groups',
      () async {
    final calls = <FakeInvocationRecord, List<ProcessResult>>{
      FakeInvocationRecord(<String>['commandA1', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'outputA1', 'stderrA1'),
      ],
      FakeInvocationRecord(<String>['commandB1', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'outputB1', 'stderrB1'),
      ],
      FakeInvocationRecord(<String>['commandA2', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'outputA2', 'stderrA2'),
      ],
      FakeInvocationRecord(<String>['commandB2', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, -1, 'outputB2', 'stderrB2'),
      ],
      FakeInvocationRecord(<String>['commandA3', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'outputA3', 'stderrA3'),
      ],
      FakeInvocationRecord(<String>['commandB3', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'outputB3', 'stderrB3'),
      ],
    };
    fakeProcessManager.fakeResults = calls;
    final jobs = <WorkerJobGroup>[
      WorkerJobGroup(
        <WorkerJob>[
          WorkerJob(<String>['commandA1', 'arg1', 'arg2'], name: 'job A1'),
          WorkerJob(<String>['commandA2', 'arg1', 'arg2'], name: 'job A2'),
          WorkerJob(<String>['commandA3', 'arg1', 'arg2'], name: 'job A3'),
        ],
        name: 'Group A',
      ),
      WorkerJobGroup(
        <WorkerJob>[
          WorkerJob(<String>['commandB1', 'arg1', 'arg2'], name: 'job B1'),
          WorkerJob(<String>['commandB2', 'arg1', 'arg2'], name: 'job B2'),
          WorkerJob(<String>['commandB3', 'arg1', 'arg2'], name: 'job B3'),
        ],
        name: 'Group B',
      ),
    ];
    final completed = await processPool.runToCompletion(jobs);
    expect(completed.length, equals(6));
    // Command B2 failed with -1, so B3 should also fail.
    expect(
      completed
          .where((WorkerJob job) => job.result.exitCode != 0)
          .map((WorkerJob job) => job.name),
      unorderedEquals(<String>['job B2', 'job B3']),
    );
    expect(
      completed
          .where((WorkerJob job) => job.exception == null)
          .map((WorkerJob job) => job.name),
      unorderedEquals(<String>['job A1', 'job B1', 'job A2', 'job A3']),
    );
    expect(
      completed
          .where((WorkerJob job) => job.result.exitCode == 0)
          .map((WorkerJob job) => job.name),
      unorderedEquals(<String>['job B1', 'job A1', 'job A2', 'job A3']),
    );
    // Either group A or B can come first, but the individual group tasks should
    // be in order.
    expect(
      <String>[completed[0].name, completed[1].name],
      unorderedEquals(<String>['job A1', 'job B1']),
    );
    expect(
      <String>[completed[2].name, completed[3].name],
      unorderedEquals(<String>['job A2', 'job B2']),
    );
    expect(
      <String>[completed[4].name, completed[5].name],
      unorderedEquals(<String>['job A3', 'job B3']),
    );
  });
  test('Commands in task groups can depend on other groups', () async {
    final calls = <FakeInvocationRecord, List<ProcessResult>>{
      FakeInvocationRecord(<String>['commandA1', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'outputA1', 'stderrA1'),
      ],
      FakeInvocationRecord(<String>['commandB1', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'outputB1', 'stderrB1'),
      ],
      FakeInvocationRecord(<String>['commandA2', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'outputA2', 'stderrA2'),
      ],
      FakeInvocationRecord(<String>['commandB2', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, -1, 'outputB2', 'stderrB2'),
      ],
      FakeInvocationRecord(<String>['commandA3', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'outputA3', 'stderrA3'),
      ],
      FakeInvocationRecord(<String>['commandB3', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'outputB3', 'stderrB3'),
      ],
    };
    fakeProcessManager.fakeResults = calls;
    final groupA = WorkerJobGroup(
      <DependentJob>[
        WorkerJob(<String>['commandA1', 'arg1', 'arg2'], name: 'job A1'),
        WorkerJob(<String>['commandA2', 'arg1', 'arg2'], name: 'job A2'),
        WorkerJob(<String>['commandA3', 'arg1', 'arg2'], name: 'job A3'),
      ],
      name: 'Group A',
    );
    final groupB = WorkerJobGroup(
      <DependentJob>[
        WorkerJob(<String>['commandB1', 'arg1', 'arg2'], name: 'job B1'),
        WorkerJob(<String>['commandB2', 'arg1', 'arg2'], name: 'job B2'),
        WorkerJob(<String>['commandB3', 'arg1', 'arg2'], name: 'job B3'),
      ],
      name: 'Group B',
    );
    groupB.addDependency(groupA);
    final jobs = <DependentJob>[groupA, groupB];
    final completed = await processPool.runToCompletion(jobs);
    expect(completed.length, equals(6));
    // Make sure they executed in the correct order.
    expect(
        completed.map<String>((WorkerJob job) => job.name),
        equals(<String>[
          'job A1',
          'job A2',
          'job A3',
          'job B1',
          'job B2',
          'job B3'
        ]));
    // Command B2 failed with -1, so B3 should also fail.
    expect(
      completed
          .where((WorkerJob job) => job.result.exitCode != 0)
          .map((WorkerJob job) => job.name),
      unorderedEquals(<String>['job B2', 'job B3']),
    );
    expect(
      completed
          .where((WorkerJob job) => job.exception == null)
          .map((WorkerJob job) => job.name),
      unorderedEquals(<String>['job A1', 'job B1', 'job A2', 'job A3']),
    );
    expect(
      completed
          .where((WorkerJob job) => job.result.exitCode == 0)
          .map((WorkerJob job) => job.name),
      unorderedEquals(<String>['job B1', 'job A1', 'job A2', 'job A3']),
    );
  });
  test("Jobs can't depend on themselves", () async {
    final job =
        WorkerJob(<String>['commandA1', 'arg1', 'arg2'], name: 'job A1');

    ProcessRunnerException? exception;
    try {
      job.addDependency(job);
    } on ProcessRunnerException catch (e) {
      exception = e;
    }
    expect(exception, isNotNull);
    expect(exception!.message, equals('A job cannot depend on itself'));
  });
  test("Jobs can't depend on each other directly", () async {
    final jobA =
        WorkerJob(<String>['commandA1', 'arg1', 'arg2'], name: 'job A1');
    final jobB =
        WorkerJob(<String>['commandB1', 'arg1', 'arg2'], name: 'job B1');

    ProcessRunnerException? exception;
    try {
      jobA.addDependency(jobB);
      jobB.addDependency(jobA);
    } on ProcessRunnerException catch (e) {
      exception = e;
    }
    expect(exception, isNotNull);
    expect(
      exception!.message,
      equals('job B1 is already a dependency of job A1, no cycle allowed'),
    );
  });
  test("Jobs can't depend on each other indirectly", () async {
    fakeProcessManager = FakeProcessManager((String value) {});
    processRunner = ProcessRunner(processManager: fakeProcessManager);
    processPool = ProcessPool(processRunner: processRunner, printReport: null);
    final calls = <FakeInvocationRecord, List<ProcessResult>>{
      FakeInvocationRecord(<String>['commandA1', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'outputA1', 'stderrA1'),
      ],
      FakeInvocationRecord(<String>['commandB1', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'outputB1', 'stderrB1'),
      ],
      FakeInvocationRecord(<String>['commandC1', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'outputC1', 'stderrC1'),
      ],
    };
    fakeProcessManager.fakeResults = calls;
    final jobA =
        WorkerJob(<String>['commandA1', 'arg1', 'arg2'], name: 'job A1');
    final jobB =
        WorkerJob(<String>['commandB1', 'arg1', 'arg2'], name: 'job B1');
    final jobC =
        WorkerJob(<String>['commandC1', 'arg1', 'arg2'], name: 'job C1');

    ProcessRunnerException? exception;
    try {
      jobA.addDependency(jobB);
      jobB.addDependency(jobC);
      jobC.addDependency(jobA);
      await processPool.runToCompletion(<DependentJob>[jobA, jobB, jobC]);
    } on ProcessRunnerException catch (e) {
      exception = e;
    }
    expect(exception, isNotNull, reason: 'Should have thrown an exception');
    expect(
      exception!.message,
      equals(
        'Illegal dependency loop detected:\n'
        '  job A1\n'
        '  job B1\n'
        '  job C1\n'
        '  job A1',
      ),
    );
  });

  test('throws when a job depends on a job not in the pool', () async {
    final jobA = WorkerJob(<String>['commandA'], name: 'job A');
    final jobB = WorkerJob(<String>['commandB'], name: 'job B');
    jobA.addDependency(jobB);
    final jobs = <DependentJob>[jobA];
    expect(
      () => processPool.runToCompletion(jobs),
      throwsA(isA<ProcessRunnerException>().having(
        (e) => e.message,
        'message',
        contains("job A has dependent jobs that aren't scheduled to be run"),
      )),
    );
  });

  test('WorkerJob with stdin works', () async {
    final stdinCaptured = <String>[];
    fakeProcessManager = FakeProcessManager(stdinCaptured.add);
    processRunner = ProcessRunner(
      processManager: fakeProcessManager,
      defaultWorkingDirectory: fs.directory(testPath),
    );
    processPool = ProcessPool(processRunner: processRunner, printReport: null);

    final calls = <FakeInvocationRecord, List<ProcessResult>>{
      FakeInvocationRecord(<String>['command', 'arg1', 'arg2'],
          workingDirectory: testPath): <ProcessResult>[
        ProcessResult(0, 0, 'output1', ''),
      ],
    };
    fakeProcessManager.fakeResults = calls;
    final jobs = <WorkerJob>[
      WorkerJob(
        <String>['command', 'arg1', 'arg2'],
        name: 'job 1',
        stdin: Stream<String>.fromIterable(<String>['input']),
      ),
    ];
    await processPool.runToCompletion(jobs);
    fakeProcessManager.verifyCalls(calls.keys);
    expect(stdinCaptured, equals(<String>['input']));
  });

  test('defaultReportToString formats correctly', () {
    expect(
      ProcessPool.defaultReportToString(100, 20, 10, 60, 10),
      'Jobs:  30% done,  20/100 completed, 10 in progress,  60 pending,  10 failed.    \r',
    );
    expect(
      ProcessPool.defaultReportToString(0, 0, 0, 0, 0),
      'Jobs: 100% done,   0/0   completed,  0 in progress,   0 pending,   0 failed.    \r',
    );
  });
}