// Copyright (c) 2013, 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.

import "dart:async";
import "dart:io";

import "package:status_file/expectation.dart";
import "package:test_runner/src/command.dart";
import "package:test_runner/src/configuration.dart";
import "package:test_runner/src/options.dart";
import "package:test_runner/src/process_queue.dart";
import "package:test_runner/src/repository.dart";
import "package:test_runner/src/test_case.dart";
import "package:test_runner/src/test_file.dart";
import "package:test_runner/src/test_progress.dart" as progress;
import "package:test_runner/src/test_suite.dart";

final defaultTimeout = 30;

class TestController {
  static int numTests = 0;
  static int numCompletedTests = 0;

  // Used as TestCase.completedCallback.
  static processCompletedTest(TestCase testCase) {
    final passed = testCase.result.canBeOutcomeOf(testCase.realExpected);
    numCompletedTests++;

    // This test is expected to pass but actually fails
    if (testCase.displayName == "fail-unexpected") {
      if (passed) _fail(testCase, 'passed unexpectedly');
      return;
    }

    // This test is expected to pass but actually times out
    if (testCase.displayName == "timeout") {
      if (passed || testCase.result != Expectation.timeout) {
        _fail(testCase, 'did not timeout');
      }
      return;
    }

    // Other tests are either
    // * expected to pass and actually pass
    // * expected to fail and actually fail
    // * expected to <X> and actually <X>
    if (!passed) _fail(testCase, 'did not pass');
  }

  static Never _fail(TestCase testCase, String message) {
    var stdout = String.fromCharCodes(testCase.lastCommandOutput.stdout);
    var stderr = String.fromCharCodes(testCase.lastCommandOutput.stderr);
    print("stdout = [$stdout]");
    print("stderr = [$stderr]");
    throw "Test case '${testCase.displayName}' $message\n"
        "  Actual: ${testCase.result}\n"
        "  Expected: ${testCase.realExpected} "
        "(${testCase.expectedOutcomes.join(', ')}))";
  }

  static void finished() {
    if (numTests != numCompletedTests) {
      throw "bad completion count. "
          "expected: $numTests, actual: $numCompletedTests";
    }
  }
}

class CustomTestSuite extends TestSuite {
  CustomTestSuite(TestConfiguration configuration)
      : super(configuration, "CustomTestSuite", []);

  @override
  void findTestCases(TestCaseEvent onTest, Map testCache) {
    void enqueueTestCase(TestCase testCase) {
      TestController.numTests++;
      onTest(testCase);
    }

    var testCaseCrash =
        _makeTestCase("crash", defaultTimeout, [Expectation.crash]);
    var testCasePass =
        _makeTestCase("pass", defaultTimeout, [Expectation.pass]);
    var testCaseFail =
        _makeTestCase("fail", defaultTimeout, [Expectation.runtimeError]);
    var testCaseTimeout = _makeTestCase("timeout", 5, [Expectation.timeout]);
    var testCaseFailUnexpected =
        _makeTestCase("fail-unexpected", defaultTimeout, [Expectation.pass]);

    enqueueTestCase(testCaseCrash);
    enqueueTestCase(testCasePass);
    enqueueTestCase(testCaseFail);
    enqueueTestCase(testCaseTimeout);
    enqueueTestCase(testCaseFailUnexpected);
  }

  TestCase _makeTestCase(
      String name, timeout, Iterable<Expectation> expectations) {
    var configuration = OptionsParser().parse(['--timeout', '$timeout'])[0];
    final args = [
      if (Platform.packageConfig != null)
        '--packages=${Platform.packageConfig}',
      Platform.script.toFilePath(),
      name,
    ];
    final command = VMCommand(Platform.executable, args, {});
    final testFile = TestFile.vmUnitTest('suite/dummy_test',
        hasCompileError: expectations
            .any((e) => e.canBeOutcomeOf(Expectation.compileTimeError)),
        hasRuntimeError:
            expectations.any((e) => e.canBeOutcomeOf(Expectation.runtimeError)),
        hasCrash: expectations.any((e) => e.canBeOutcomeOf(Expectation.crash)));
    return TestCase(name, [command], configuration,
        Set<Expectation>.from(expectations), testFile);
  }
}

void testProcessQueue() {
  var maxProcesses = 2;
  var maxBrowserProcesses = maxProcesses;
  var config = OptionsParser().parse(['--no-batch'])[0];
  ProcessQueue(config, maxProcesses, maxBrowserProcesses,
      [CustomTestSuite(config)], [EventListener()], TestController.finished);
}

class EventListener extends progress.EventListener {
  @override
  void done(TestCase test) {
    TestController.processCompletedTest(test);
  }
}

void main(List<String> arguments) {
  // This script is in [sdk]/tests/standalone/io.
  Repository.uri = Platform.script.resolve('../../..');
  // Run the test_runner_test if there are no command-line options.
  // Otherwise, run one of the component tests that always pass,
  // fail, or timeout.
  if (arguments.isEmpty) {
    testProcessQueue();
  } else {
    switch (arguments[0]) {
      case 'crash':
        exit(253);
      case 'fail-unexpected':
      case 'fail':
        throw "This test always fails, to test the test scripts.";
      case 'pass':
        return;
      case 'timeout':
        // This process should be killed by the test after DEFAULT_TIMEOUT
        Timer(const Duration(hours: 42), () {});
        break;
      default:
        throw "Unknown option ${arguments[0]} passed to test_runner_test";
    }
  }
}