// Copyright (c) 2019, 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 'package:analysis_server/src/computer/computer_highlights.dart';
import 'package:analysis_server/src/protocol_server.dart';
import 'package:analyzer/dart/analysis/results.dart';
import 'package:test/test.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';

import '../../abstract_context.dart';

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

@reflectiveTest
class HighlightsComputerTest extends AbstractContextTest {
  String sourcePath;
  String content;
  List<HighlightRegion> highlights;

  setUp() {
    super.setUp();
    sourcePath = convertPath('/home/test/lib/test.dart');
  }

  test_extension() async {
    createAnalysisOptionsFile(experiments: ['extension-methods']);
    await _computeHighlights('''
extension E on String {}
''');
    _check(HighlightRegionType.KEYWORD, 'extension');
    _check(HighlightRegionType.BUILT_IN, 'on');
  }

  test_methodInvocation_ofExtensionOverride_unresolved() async {
    createAnalysisOptionsFile(experiments: ['extension-methods']);
    await _computeHighlights('''
extension E on int {}

main() {
  E(0).foo();
}
''', hasErrors: true);
    _check(HighlightRegionType.IDENTIFIER_DEFAULT, 'foo');
  }

  void _check(HighlightRegionType expectedType, String expectedText) {
    for (var region in highlights) {
      if (region.type == expectedType) {
        int startIndex = region.offset;
        int endIndex = startIndex + region.length;
        String highlightedText = content.substring(startIndex, endIndex);
        if (highlightedText == expectedText) {
          return;
        }
      }
    }
    fail('Expected region of type $expectedType with text "$expectedText"');
  }

  Future<void> _computeHighlights(
    String content, {
    bool hasErrors = false,
  }) async {
    this.content = content;
    newFile(sourcePath, content: content);
    ResolvedUnitResult result = await session.getResolvedUnit(sourcePath);

    if (hasErrors) {
      expect(result.errors, isNotEmpty);
    } else {
      expect(result.errors, isEmpty);
    }

    DartUnitHighlightsComputer computer =
        new DartUnitHighlightsComputer(result.unit);
    highlights = computer.compute();
  }
}