// Copyright (c) 2014, 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.

library test.domain.completion;

import 'dart:async';

import 'package:analysis_server/plugin/protocol/protocol.dart';
import 'package:analysis_server/src/domain_completion.dart';
import 'package:analysis_server/src/provisional/completion/completion_core.dart';
import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
import 'package:analysis_server/src/services/completion/dart/completion_manager.dart';
import 'package:analysis_server/src/services/completion/dart/contribution_sorter.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';
import 'package:unittest/unittest.dart';

import 'analysis_abstract.dart';
import 'domain_completion_util.dart';
import 'mocks.dart' show pumpEventQueue;
import 'utils.dart';

main() {
  initializeTestEnvironment();
  defineReflectiveTests(CompletionDomainHandlerTest);
  defineReflectiveTests(_NoSearchEngine);
}

@reflectiveTest
class CompletionDomainHandlerTest extends AbstractCompletionDomainTest {
  test_html() {
    testFile = '/project/web/test.html';
    addTestFile('''
      <html>^</html>
    ''');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      expect(suggestions, hasLength(0));
    });
  }

  test_imports() {
    addTestFile('''
      import 'dart:html';
      main() {^}
    ''');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'Object');
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'HtmlElement');
      assertNoResult('test');
    });
  }

  test_imports_aborted_new_request() async {
    addTestFile('''
        class foo { }
        c^''');

    // Make a request for suggestions
    Request request =
        new CompletionGetSuggestionsParams(testFile, completionOffset)
            .toRequest('7');
    Response response = handleSuccessfulRequest(request);
    var result1 = new CompletionGetSuggestionsResult.fromResponse(response);
    var completionId1 = result1.id;
    assertValidId(response.id);

    // Perform some analysis but assert that no suggestions have yet been made
    completionId = completionId1;
    await pumpEventQueue(25);
    expect(suggestionsDone, isFalse);
    expect(suggestions, hasLength(0));

    // Make another request before the first request completes
    Request request2 =
        new CompletionGetSuggestionsParams(testFile, completionOffset)
            .toRequest('8');
    Response response2 = handleSuccessfulRequest(request2);
    var result2 = new CompletionGetSuggestionsResult.fromResponse(response2);
    var completionId2 = result2.id;
    assertValidId(completionId2);

    // Wait for both sets of suggestions
    completionId = completionId2;
    await pumpEventQueue();
    expect(allSuggestions[completionId1], hasLength(0));
    expect(allSuggestions[completionId2], same(suggestions));
    assertHasResult(CompletionSuggestionKind.KEYWORD, 'class',
        relevance: DART_RELEVANCE_HIGH);
  }

  test_imports_aborted_source_changed() async {
    addTestFile('''
        class foo { }
        c^''');

    // Make a request for suggestions
    Request request =
        new CompletionGetSuggestionsParams(testFile, completionOffset)
            .toRequest('0');
    Response response = handleSuccessfulRequest(request);
    completionId = response.id;
    assertValidId(completionId);

    // Perform some analysis but assert that no suggestions have yet been made
    await pumpEventQueue(25);
    expect(suggestionsDone, isFalse);
    expect(suggestions, hasLength(0));

    // Simulate user deleting text after request but before suggestions returned
    server.updateContent('uc1', {testFile: new AddContentOverlay(testCode)});
    server.updateContent('uc2', {
      testFile: new ChangeContentOverlay(
          [new SourceEdit(completionOffset - 1, 1, '')])
    });

    // Expect the completion domain to discard request because source changed
    await pumpEventQueue().then((_) {
      expect(suggestionsDone, isTrue);
    });
    expect(suggestions, hasLength(0));
  }

  test_imports_incremental() async {
    addTestFile('''library foo;
      e^
      import "dart:async";
      import "package:foo/foo.dart";
      class foo { }''');
    await waitForTasksFinished();
    server.updateContent('uc1', {testFile: new AddContentOverlay(testCode)});
    server.updateContent('uc2', {
      testFile:
          new ChangeContentOverlay([new SourceEdit(completionOffset, 0, 'xp')])
    });
    completionOffset += 2;
    await getSuggestions();
    expect(replacementOffset, completionOffset - 3);
    expect(replacementLength, 3);
    assertHasResult(CompletionSuggestionKind.KEYWORD, 'export',
        relevance: DART_RELEVANCE_HIGH);
    assertHasResult(CompletionSuggestionKind.KEYWORD, 'import',
        relevance: DART_RELEVANCE_HIGH);
    assertNoResult('extends');
    assertNoResult('library');
  }

  test_imports_partial() async {
    addTestFile('''^
      import "package:foo/foo.dart";
      import "package:bar/bar.dart";
      class Baz { }''');

    // Wait for analysis then edit the content
    await waitForTasksFinished();
    String revisedContent = testCode.substring(0, completionOffset) +
        'i' +
        testCode.substring(completionOffset);
    ++completionOffset;
    server.handleRequest(new AnalysisUpdateContentParams(
        {testFile: new AddContentOverlay(revisedContent)}).toRequest('add1'));

    // Request code completion immediately after edit
    Response response = handleSuccessfulRequest(
        new CompletionGetSuggestionsParams(testFile, completionOffset)
            .toRequest('0'));
    completionId = response.id;
    assertValidId(completionId);
    await waitForTasksFinished();
    expect(replacementOffset, completionOffset - 1);
    expect(replacementLength, 1);
    assertHasResult(CompletionSuggestionKind.KEYWORD, 'library',
        relevance: DART_RELEVANCE_HIGH);
    assertHasResult(CompletionSuggestionKind.KEYWORD, 'import',
        relevance: DART_RELEVANCE_HIGH);
    assertHasResult(CompletionSuggestionKind.KEYWORD, 'export',
        relevance: DART_RELEVANCE_HIGH);
    assertHasResult(CompletionSuggestionKind.KEYWORD, 'part',
        relevance: DART_RELEVANCE_HIGH);
    assertNoResult('extends');
  }

  test_imports_prefixed() {
    addTestFile('''
      import 'dart:html' as foo;
      main() {^}
    ''');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'Object');
      assertHasResult(CompletionSuggestionKind.IDENTIFIER, 'foo');
      assertNoResult('HtmlElement');
      assertNoResult('test');
    });
  }

  test_imports_prefixed2() {
    addTestFile('''
      import 'dart:html' as foo;
      main() {foo.^}
    ''');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'HtmlElement');
      assertNoResult('test');
    });
  }

  test_inComment_block_beforeNode() async {
    addTestFile('''
  main(aaa, bbb) {
    /* text ^ */
    print(42);
  }
  ''');
    await getSuggestions();
    expect(suggestions, isEmpty);
  }

  test_inComment_endOfLine_beforeNode() async {
    addTestFile('''
  main(aaa, bbb) {
    // text ^
    print(42);
  }
  ''');
    await getSuggestions();
    expect(suggestions, isEmpty);
  }

  test_inComment_endOfLine_beforeToken() async {
    addTestFile('''
  main(aaa, bbb) {
    // text ^
  }
  ''');
    await getSuggestions();
    expect(suggestions, isEmpty);
  }

  test_inDartDoc1() async {
    addTestFile('''
  /// ^
  main(aaa, bbb) {}
  ''');
    await getSuggestions();
    expect(suggestions, isEmpty);
  }

  test_inDartDoc2() async {
    addTestFile('''
  /// Some text^
  main(aaa, bbb) {}
  ''');
    await getSuggestions();
    expect(suggestions, isEmpty);
  }

  test_inDartDoc_reference1() async {
    addFile(
        '/testA.dart',
        '''
  part of libA;
  foo(bar) => 0;''');
    addTestFile('''
  library libA;
  part "/testA.dart";
  import "dart:math";
  /// The [^]
  main(aaa, bbb) {}
  ''');
    await getSuggestions();
    assertHasResult(CompletionSuggestionKind.IDENTIFIER, 'main',
        relevance: DART_RELEVANCE_LOCAL_FUNCTION);
    assertHasResult(CompletionSuggestionKind.IDENTIFIER, 'foo',
        relevance: DART_RELEVANCE_LOCAL_FUNCTION);
    assertHasResult(CompletionSuggestionKind.IDENTIFIER, 'min');
  }

  test_inDartDoc_reference2() async {
    addTestFile('''
  /// The [m^]
  main(aaa, bbb) {}
  ''');
    await getSuggestions();
    assertHasResult(CompletionSuggestionKind.IDENTIFIER, 'main',
        relevance: DART_RELEVANCE_LOCAL_FUNCTION);
  }

  test_inherited() {
    addFile('/libA.dart', 'class A {m() {}}');
    addTestFile('''
import '/libA.dart';
class B extends A {
  x() {^}
}
''');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'm');
    });
  }

  test_invocation() {
    addTestFile('class A {b() {}} main() {A a; a.^}');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'b');
    });
  }

  test_invocation_sdk_relevancy_off() {
    var originalSorter = DartCompletionManager.contributionSorter;
    var mockSorter = new MockRelevancySorter();
    DartCompletionManager.contributionSorter = mockSorter;
    addTestFile('main() {Map m; m.^}');
    return getSuggestions().then((_) {
      // Assert that the CommonUsageComputer has been replaced
      expect(suggestions.any((s) => s.relevance == DART_RELEVANCE_COMMON_USAGE),
          isFalse);
      DartCompletionManager.contributionSorter = originalSorter;
      mockSorter.enabled = false;
    });
  }

  test_invocation_sdk_relevancy_on() {
    addTestFile('main() {Map m; m.^}');
    return getSuggestions().then((_) {
      // Assert that the CommonUsageComputer is working
      expect(suggestions.any((s) => s.relevance == DART_RELEVANCE_COMMON_USAGE),
          isTrue);
    });
  }

  test_invocation_withTrailingStmt() {
    addTestFile('class A {b() {}} main() {A a; a.^ int x = 7;}');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'b');
    });
  }

  test_keyword() {
    addTestFile('library A; cl^');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset - 2));
      expect(replacementLength, equals(2));
      assertHasResult(CompletionSuggestionKind.KEYWORD, 'export',
          relevance: DART_RELEVANCE_HIGH);
      assertHasResult(CompletionSuggestionKind.KEYWORD, 'class',
          relevance: DART_RELEVANCE_HIGH);
    });
  }

  test_local_named_constructor() {
    addTestFile('class A {A.c(); x() {new A.^}}');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'c');
      assertNoResult('A');
    });
  }

  test_local_override() {
    addFile('/libA.dart', 'class A {m() {}}');
    addTestFile('''
import '/libA.dart';
class B extends A {
  m() {}
  x() {^}
}
''');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'm',
          relevance: DART_RELEVANCE_LOCAL_METHOD);
    });
  }

  test_locals() {
    addTestFile('class A {var a; x() {var b;^}} class DateTime { }');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'A');
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'a',
          relevance: DART_RELEVANCE_LOCAL_FIELD);
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'b',
          relevance: DART_RELEVANCE_LOCAL_VARIABLE);
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'x',
          relevance: DART_RELEVANCE_LOCAL_METHOD);
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'DateTime');
    });
  }

  test_offset_past_eof() {
    addTestFile('main() { }', offset: 300);
    Request request =
        new CompletionGetSuggestionsParams(testFile, completionOffset)
            .toRequest('0');
    Response response = handler.handleRequest(request);
    expect(response.id, '0');
    expect(response.error.code, RequestErrorCode.INVALID_PARAMETER);
  }

  test_overrides() {
    addFile('/libA.dart', 'class A {m() {}}');
    addTestFile('''
import '/libA.dart';
class B extends A {m() {^}}
''');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'm',
          relevance: DART_RELEVANCE_LOCAL_METHOD);
    });
  }

  test_partFile() {
    addFile(
        '/project/bin/testA.dart',
        '''
      library libA;
      part "$testFile";
      import 'dart:html';
      class A { }
    ''');
    addTestFile('''
      part of libA;
      main() {^}''');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'Object');
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'HtmlElement');
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'A');
      assertNoResult('test');
    });
  }

  test_partFile2() {
    addFile(
        '/testA.dart',
        '''
      part of libA;
      class A { }''');
    addTestFile('''
      library libA;
      part "/testA.dart";
      import 'dart:html';
      main() {^}
    ''');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'Object');
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'HtmlElement');
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'A');
      assertNoResult('test');
    });
  }

  test_simple() {
    addTestFile('''
      void main() {
        ^
      }
    ''');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'Object');
      assertNoResult('HtmlElement');
      assertNoResult('test');
    });
  }

  test_static() {
    addTestFile('class A {static b() {} c() {}} main() {A.^}');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset));
      expect(replacementLength, equals(0));
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'b');
      assertNoResult('c');
    });
  }

  test_topLevel() {
    addTestFile('''
      typedef foo();
      var test = '';
      main() {tes^t}
    ''');
    return getSuggestions().then((_) {
      expect(replacementOffset, equals(completionOffset - 3));
      expect(replacementLength, equals(4));
      // Suggestions based upon imported elements are partially filtered
      //assertHasResult(CompletionSuggestionKind.INVOCATION, 'Object');
      assertHasResult(CompletionSuggestionKind.INVOCATION, 'test',
          relevance: DART_RELEVANCE_LOCAL_TOP_LEVEL_VARIABLE);
      assertNoResult('HtmlElement');
    });
  }
}

class MockRelevancySorter implements DartContributionSorter {
  bool enabled = true;

  @override
  Future sort(
      CompletionRequest request, Iterable<CompletionSuggestion> suggestions) {
    if (!enabled) {
      throw 'unexpected sort';
    }
    return new Future.value();
  }
}

@reflectiveTest
class _NoSearchEngine extends AbstractAnalysisTest {
  @override
  void setUp() {
    super.setUp();
    createProject();
    handler = new CompletionDomainHandler(server);
  }

  test_noSearchEngine() async {
    addTestFile('''
main() {
  ^
}
    ''');
    await waitForTasksFinished();
    Request request =
        new CompletionGetSuggestionsParams(testFile, 0).toRequest('0');
    Response response = handler.handleRequest(request);
    expect(response.error, isNotNull);
    expect(response.error.code, RequestErrorCode.NO_INDEX_GENERATED);
  }
}