// Copyright (c) 2017, 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 'package:analysis_server/protocol/protocol.dart';
import 'package:analysis_server/protocol/protocol_generated.dart';
import 'package:analysis_server/src/edit/edit_domain.dart';
import 'package:analyzer_plugin/protocol/protocol_common.dart';
import 'package:plugin/manager.dart';
import 'package:test/test.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';

import '../analysis_abstract.dart';

main() {
  defineReflectiveSuite(() {
    defineReflectiveTests(StatementCompletionTest);
  });
}

@reflectiveTest
class StatementCompletionTest extends AbstractAnalysisTest {
  SourceChange change;

  @override
  void setUp() {
    super.setUp();
    createProject();
    ExtensionManager manager = new ExtensionManager();
    manager.processPlugins([server.serverPlugin]);
    handler = new EditDomainHandler(server);
  }

  test_plainEnterFromStart() async {
    addTestFile('''
main() {
  int v = 1;
}
''');
    await waitForTasksFinished();
    await _prepareCompletion('v = 1;', atStart: true);
    _assertHasChange(
        'Insert a newline at the end of the current line',
        '''
main() {
  int v = 1;
  /*caret*/
}
''');
  }

  test_plainOleEnter() async {
    addTestFile('''
main() {
  int v = 1;
}
''');
    await waitForTasksFinished();
    await _prepareCompletion('v = 1;', atEnd: true);
    _assertHasChange(
        'Insert a newline at the end of the current line',
        '''
main() {
  int v = 1;
  /*caret*/
}
''');
  }

  test_plainOleEnterWithError() async {
    addTestFile('''
main() {
  int v =
}
''');
    await waitForTasksFinished();
    String match = 'v =';
    await _prepareCompletion(match, atEnd: true);
    _assertHasChange(
        'Insert a newline at the end of the current line',
        '''
main() {
  int v =
  x
}
''',
        (s) => s.indexOf(match) + match.length); // Ensure cursor after '='.
  }

  void _assertHasChange(String message, String expectedCode, [Function cmp]) {
    if (change.message == message) {
      if (!change.edits.isEmpty) {
        String resultCode =
            SourceEdit.applySequence(testCode, change.edits[0].edits);
        expect(resultCode, expectedCode.replaceAll('/*caret*/', ''));
        if (cmp != null) {
          int offset = cmp(resultCode);
          expect(change.selection.offset, offset);
        }
      } else {
        if (cmp != null) {
          int offset = cmp(testCode);
          expect(change.selection.offset, offset);
        }
      }
      return;
    }
    fail("Expected to find |$message| but got: " + change.message);
  }

  _prepareCompletion(String search,
      {bool atStart: false, bool atEnd: false, int delta: 0}) async {
    int offset = findOffset(search);
    if (atStart) {
      delta = 0;
    } else if (atEnd) {
      delta = search.length;
    }
    await _prepareCompletionAt(offset + delta);
  }

  _prepareCompletionAt(int offset) async {
    Request request =
        new EditGetStatementCompletionParams(testFile, offset).toRequest('0');
    Response response = await waitResponse(request);
    var result = new EditGetStatementCompletionResult.fromResponse(response);
    change = result.change;
  }
}