// Copyright (c) 2015, 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:analyzer/src/analysis_options/analysis_options_provider.dart';
import 'package:analyzer/src/file_system/file_system.dart';
import 'package:analyzer/src/generated/source.dart';
import 'package:analyzer/src/util/file_paths.dart' as file_paths;
import 'package:analyzer/src/util/yaml.dart';
import 'package:analyzer_testing/resource_provider_mixin.dart';
import 'package:test/test.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';
import 'package:yaml/yaml.dart';

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

  group('AnalysisOptionsProvider', () {
    void expectMergesTo(String defaults, String overrides, String expected) {
      var optionsProvider = AnalysisOptionsProvider();
      var defaultOptions = optionsProvider.getOptionsFromString(defaults);
      var overrideOptions = optionsProvider.getOptionsFromString(overrides);
      var merged = optionsProvider.merge(defaultOptions, overrideOptions);
      expectEquals(merged, optionsProvider.getOptionsFromString(expected));
    }

    group('merging', () {
      test('integration', () {
        expectMergesTo(
          '''
analyzer:
  plugins:
    - p1
    - p2
  errors:
    unused_local_variable : error
linter:
  rules:
    - camel_case_types
    - one_member_abstracts
''',
          '''
analyzer:
  plugins:
    - p3
  errors:
    unused_local_variable : ignore # overrides error
linter:
  rules:
    one_member_abstracts: false # promotes and disables
    always_specify_return_types: true
''',
          '''
analyzer:
  plugins:
    - p1
    - p2
    - p3
  errors:
    unused_local_variable : ignore
linter:
  rules:
    camel_case_types: true
    one_member_abstracts: false
    always_specify_return_types: true
''',
        );
      });
    });
  });

  group('AnalysisOptionsProvider', () {
    test('test_bad_yaml (1)', () {
      var src = '''
    analyzer: # <= bang
strong-mode: true
''';

      var optionsProvider = AnalysisOptionsProvider();
      expect(
        () => optionsProvider.getOptionsFromString(src),
        throwsA(TypeMatcher<OptionsFormatException>()),
      );
    });

    test('test_bad_yaml (2)', () {
      var src = '''
analyzer:
  strong-mode:true # missing space (sdk/issues/24885)
''';

      var optionsProvider = AnalysisOptionsProvider();
      // Should not throw an exception.
      var options = optionsProvider.getOptionsFromString(src);
      // Should return a non-null options list.
      expect(options, isNotNull);
    });
  });
}

bool containsKey(Map<Object, YamlNode> map, Object key) =>
    _getValue(map, key) != null;

void expectEquals(YamlNode? actual, YamlNode? expected) {
  if (expected is YamlScalar) {
    actual!;
    expect(actual, TypeMatcher<YamlScalar>());
    expect(expected.value, actual.value);
  } else if (expected is YamlList) {
    if (actual is YamlList) {
      expect(actual.length, expected.length);
      List<YamlNode> expectedNodes = expected.nodes;
      List<YamlNode> actualNodes = actual.nodes;
      for (int i = 0; i < expectedNodes.length; i++) {
        expectEquals(actualNodes[i], expectedNodes[i]);
      }
    } else {
      fail('Expected a YamlList, found ${actual.runtimeType}');
    }
  } else if (expected is YamlMap) {
    if (actual is YamlMap) {
      expect(actual.length, expected.length);
      var expectedNodes = expected.nodes.cast<Object, YamlNode>();
      var actualNodes = actual.nodes.cast<Object, YamlNode>();
      for (var expectedKey in expectedNodes.keys) {
        if (!containsKey(actualNodes, expectedKey)) {
          fail('Missing key $expectedKey');
        }
      }
      for (var actualKey in actualNodes.keys) {
        if (!containsKey(expectedNodes, actualKey)) {
          fail('Extra key $actualKey');
        }
      }
      for (var expectedKey in expectedNodes.keys) {
        expectEquals(
          _getValue(actualNodes, expectedKey),
          _getValue(expectedNodes, expectedKey),
        );
      }
    } else {
      fail('Expected a YamlMap, found ${actual.runtimeType}');
    }
  } else {
    fail('Unknown type of node: ${expected.runtimeType}');
  }
}

Object valueOf(Object object) =>
    object is YamlNode ? object.valueOrThrow : object;

YamlNode? _getValue(Map<Object, YamlNode?> map, Object key) {
  Object keyValue = valueOf(key);
  for (var existingKey in map.keys) {
    if (valueOf(existingKey) == keyValue) {
      return map[existingKey];
    }
  }
  return null;
}

@reflectiveTest
class AnalysisOptionsProviderTest with ResourceProviderMixin {
  String get analysisOptionsYaml => file_paths.analysisOptionsYaml;

  void test_getOptions_crawlUp_hasInFolder() {
    newFolder('/foo/bar');
    newFile('/foo/$analysisOptionsYaml', r'''
analyzer:
  ignore:
    - foo
''');
    newFile('/foo/bar/$analysisOptionsYaml', r'''
analyzer:
  ignore:
    - bar
''');
    YamlMap options = _getOptions('/foo/bar');
    expect(options, hasLength(1));
    {
      var analyzer = options.valueAt('analyzer') as YamlMap;
      expect(analyzer, isNotNull);
      expect(analyzer.valueAt('ignore'), unorderedEquals(['bar']));
    }
  }

  void test_getOptions_crawlUp_hasInParent() {
    newFolder('/foo/bar/baz');
    newFile('/foo/$analysisOptionsYaml', r'''
analyzer:
  ignore:
    - foo
''');
    newFile('/foo/bar/$analysisOptionsYaml', r'''
analyzer:
  ignore:
    - bar
''');
    YamlMap options = _getOptions('/foo/bar/baz');
    expect(options, hasLength(1));
    {
      var analyzer = options.valueAt('analyzer') as YamlMap;
      expect(analyzer, isNotNull);
      expect(analyzer.valueAt('ignore'), unorderedEquals(['bar']));
    }
  }

  void test_getOptions_doesNotExist() {
    newFolder('/notFile');
    YamlMap options = _getOptions('/notFile');
    expect(options, isEmpty);
  }

  void test_getOptions_empty() {
    newFile('/$analysisOptionsYaml', r'''#empty''');
    YamlMap options = _getOptions('/');
    expect(options, isNotNull);
    expect(options, isEmpty);
  }

  void test_getOptions_include() {
    newFile('/foo.yaml', r'''
analyzer:
  ignore:
    - ignoreme.dart
    - 'sdk_ext/**'
''');
    newFile('/$analysisOptionsYaml', r'''
include: foo.yaml
''');
    var options = _getOptions('/');
    expect(options, hasLength(2));

    var analyzer = options.valueAt('analyzer') as YamlMap;
    expect(analyzer, hasLength(1));

    var ignore = analyzer.valueAt('ignore') as YamlList;
    expect(ignore, hasLength(2));
    expect(ignore[0], 'ignoreme.dart');
    expect(ignore[1], 'sdk_ext/**');
  }

  void test_getOptions_include_emptyLints() {
    newFile('/foo.yaml', r'''
linter:
  rules:
    - prefer_single_quotes
''');
    newFile('/$analysisOptionsYaml', r'''
include: foo.yaml
linter:
  rules:
    # avoid_print: false
''');
    var options = _getOptions('/');
    expect(options, hasLength(2));

    var linter = options.valueAt('linter') as YamlMap;
    expect(linter, hasLength(1));

    var rules = linter.valueAt('rules') as YamlList;
    expect(rules, hasLength(1));
    expect(rules[0], 'prefer_single_quotes');
  }

  void test_getOptions_include_missing() {
    newFile('/$analysisOptionsYaml', r'''
include: /foo.yaml
''');
    var options = _getOptions('/');
    expect(options, hasLength(1));
  }

  void test_getOptions_invalid() {
    newFile('/$analysisOptionsYaml', r''':''');
    var options = _getOptions('/');
    expect(options, hasLength(1));
  }

  void test_getOptions_simple() {
    newFile('/$analysisOptionsYaml', r'''
analyzer:
  ignore:
    - ignoreme.dart
    - 'sdk_ext/**'
''');
    var options = _getOptions('/');
    expect(options, hasLength(1));

    var analyzer = options.valueAt('analyzer') as YamlMap;
    expect(analyzer, hasLength(1));

    var ignore = analyzer.valueAt('ignore') as YamlList;
    expect(ignore, hasLength(2));
    expect(ignore[0], 'ignoreme.dart');
    expect(ignore[1], 'sdk_ext/**');
  }

  YamlMap _getOptions(String posixPath) {
    var folder = getFolder(posixPath);
    var sourceFactory = SourceFactory([ResourceUriResolver(resourceProvider)]);
    return AnalysisOptionsProvider(sourceFactory).getOptions(folder);
  }
}