// 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.

import 'dart:mirrors';

import 'package:analysis_server/src/protocol_server.dart'
    hide DiagnosticMessage;
import 'package:analysis_server/src/services/search/search_engine.dart';
import 'package:analyzer/dart/analysis/results.dart';
import 'package:analyzer/dart/analysis/session.dart';
import 'package:analyzer/dart/element/element.dart' as engine;
import 'package:analyzer/diagnostic/diagnostic.dart';
import 'package:analyzer/error/error.dart' as engine;
import 'package:analyzer/src/dart/analysis/results.dart' as engine;
import 'package:analyzer/src/dart/error/lint_codes.dart';
import 'package:analyzer/src/diagnostic/diagnostic.dart' as engine;
import 'package:analyzer/src/error/codes.dart' as engine;
import 'package:analyzer/src/generated/source.dart' as engine;
import 'package:test/test.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';

import 'constants.dart';
import 'mocks.dart';

void main() {
  defineReflectiveSuite(() {
    defineReflectiveTests(AnalysisErrorTest);
    defineReflectiveTests(EnumTest);
  });
}

@reflectiveTest
class AnalysisErrorTest {
  late MockSource source;
  late MockAnalysisError engineError;
  late ResolvedUnitResult result;

  void setUp() {
    // prepare Source
    source = MockSource(fullName: 'foo.dart');
    // prepare AnalysisError
    engineError = MockAnalysisError(
      source: source,
      errorCode: engine.CompileTimeErrorCode.AMBIGUOUS_EXPORT,
      offset: 10,
      length: 20,
      message: 'my message',
    );
    // prepare ResolvedUnitResult
    var lineInfo = engine.LineInfo([0, 5, 9, 20]);
    result = _ResolvedUnitResultImplMock(
      lineInfo: lineInfo,
      errors: [engineError],
    );
  }

  void test_fromEngine_hasContextMessage() {
    engineError.contextMessages.add(
      engine.DiagnosticMessageImpl(
        filePath: 'bar.dart',
        offset: 30,
        length: 5,
        message: 'context',
        url: null,
      ),
    );
    var error = newAnalysisError_fromEngine(
      _ResolvedUnitResultImplMock(
        lineInfo: engine.LineInfo([0, 5, 9, 20]),
        errors: [engineError],
      ),
      engineError,
    );
    expect(error.toJson(), {
      SEVERITY: 'ERROR',
      TYPE: 'COMPILE_TIME_ERROR',
      LOCATION: {
        FILE: 'foo.dart',
        OFFSET: 10,
        LENGTH: 20,
        START_LINE: 3,
        START_COLUMN: 2,
        END_LINE: 4,
        END_COLUMN: 11,
      },
      MESSAGE: 'my message',
      CODE: 'ambiguous_export',
      URL: 'https://dart.dev/diagnostics/ambiguous_export',
      CONTEXT_MESSAGES: [
        {
          MESSAGE: 'context',
          LOCATION: {
            FILE: 'bar.dart',
            OFFSET: 30,
            LENGTH: 5,
            START_LINE: 4,
            START_COLUMN: 11,
            END_LINE: 4,
            END_COLUMN: 16,
          }
        }
      ],
      HAS_FIX: false
    });
  }

  void test_fromEngine_hasCorrection() {
    engineError = MockAnalysisError(
      source: source,
      errorCode: engine.CompileTimeErrorCode.AMBIGUOUS_EXPORT,
      offset: 10,
      length: 20,
      message: 'my message',
      correction: 'my correction',
    );
    var error = newAnalysisError_fromEngine(result, engineError);
    expect(error.toJson(), {
      SEVERITY: 'ERROR',
      TYPE: 'COMPILE_TIME_ERROR',
      LOCATION: {
        FILE: 'foo.dart',
        OFFSET: 10,
        LENGTH: 20,
        START_LINE: 3,
        START_COLUMN: 2,
        END_LINE: 4,
        END_COLUMN: 11,
      },
      MESSAGE: 'my message',
      CORRECTION: 'my correction',
      CODE: 'ambiguous_export',
      URL: 'https://dart.dev/diagnostics/ambiguous_export',
      HAS_FIX: false
    });
  }

  void test_fromEngine_hasUrl() {
    engineError = MockAnalysisError(
      source: source,
      errorCode: MockErrorCode(url: 'http://codes.dartlang.org/TEST_ERROR'),
      offset: 10,
      length: 20,
      message: 'my message',
    );
    var error = newAnalysisError_fromEngine(result, engineError);
    expect(error.toJson(), {
      SEVERITY: 'ERROR',
      TYPE: 'COMPILE_TIME_ERROR',
      LOCATION: {
        FILE: 'foo.dart',
        OFFSET: 10,
        LENGTH: 20,
        START_LINE: 3,
        START_COLUMN: 2,
        END_LINE: 4,
        END_COLUMN: 11,
      },
      MESSAGE: 'my message',
      CODE: 'test_error',
      URL: 'http://codes.dartlang.org/TEST_ERROR',
      HAS_FIX: false
    });
  }

  void test_fromEngine_lint() {
    engineError = MockAnalysisError(
      source: source,
      errorCode: LintCode('my_lint', 'my message', correction: 'correction'),
      offset: 10,
      length: 20,
      message: 'my message',
    );
    var error = newAnalysisError_fromEngine(result, engineError);
    expect(error.toJson(), {
      SEVERITY: 'INFO',
      TYPE: 'LINT',
      LOCATION: {
        FILE: 'foo.dart',
        OFFSET: 10,
        LENGTH: 20,
        START_LINE: 3,
        START_COLUMN: 2,
        END_LINE: 4,
        END_COLUMN: 11,
      },
      MESSAGE: 'my message',
      CODE: 'my_lint',
      URL: 'https://dart-lang.github.io/linter/lints/my_lint.html',
      HAS_FIX: false
    });
  }

  void test_fromEngine_noCorrection() {
    engineError = MockAnalysisError(
      source: source,
      errorCode: engine.CompileTimeErrorCode.AMBIGUOUS_EXPORT,
      offset: 10,
      length: 20,
      message: 'my message',
    );
    var error = newAnalysisError_fromEngine(result, engineError);
    expect(error.toJson(), {
      SEVERITY: 'ERROR',
      TYPE: 'COMPILE_TIME_ERROR',
      LOCATION: {
        FILE: 'foo.dart',
        OFFSET: 10,
        LENGTH: 20,
        START_LINE: 3,
        START_COLUMN: 2,
        END_LINE: 4,
        END_COLUMN: 11,
      },
      MESSAGE: 'my message',
      CODE: 'ambiguous_export',
      URL: 'https://dart.dev/diagnostics/ambiguous_export',
      HAS_FIX: false
    });
  }
}

@reflectiveTest
class EnumTest {
  void test_AnalysisErrorSeverity() {
    EnumTester<engine.ErrorSeverity, AnalysisErrorSeverity>().run(
        (engine.ErrorSeverity engineErrorSeverity) =>
            AnalysisErrorSeverity(engineErrorSeverity.name),
        exceptions: {engine.ErrorSeverity.NONE: null});
  }

  void test_AnalysisErrorType() {
    EnumTester<engine.ErrorType, AnalysisErrorType>().run(
        (engine.ErrorType engineErrorType) =>
            AnalysisErrorType(engineErrorType.name));
  }

  void test_ElementKind() {
    EnumTester<engine.ElementKind, ElementKind>()
        .run(convertElementKind, exceptions: {
      // TODO(paulberry): do any of the exceptions below constitute bugs?
      engine.ElementKind.DYNAMIC: ElementKind.UNKNOWN,
      engine.ElementKind.ERROR: ElementKind.UNKNOWN,
      engine.ElementKind.EXPORT: ElementKind.UNKNOWN,
      engine.ElementKind.GENERIC_FUNCTION_TYPE: ElementKind.FUNCTION_TYPE_ALIAS,
      engine.ElementKind.IMPORT: ElementKind.UNKNOWN,
      engine.ElementKind.NAME: ElementKind.UNKNOWN,
      engine.ElementKind.NEVER: ElementKind.UNKNOWN,
      engine.ElementKind.UNIVERSE: ElementKind.UNKNOWN
    });
  }

  void test_SearchResultKind() {
    // TODO(paulberry): why does the MatchKind class exist at all?  Can't we
    // use SearchResultKind inside the analysis server?
    EnumTester<MatchKind, SearchResultKind>()
        .run(newSearchResultKind_fromEngine);
  }
}

/// Helper class for testing the correspondence between an analysis engine enum
/// and an analysis server API enum.
class EnumTester<EngineEnum, ApiEnum> {
  /// Test that the function [convert] properly converts all possible values of
  /// [EngineEnum] to an [ApiEnum] with the same name, with the exceptions noted
  /// in [exceptions].  For each key in [exceptions], if the corresponding value
  /// is null, then we check that converting the given key results in an error.
  /// If the corresponding value is an [ApiEnum], then we check that converting
  /// the given key results in the given value.
  void run(ApiEnum Function(EngineEnum) convert,
      {Map<EngineEnum, ApiEnum?> exceptions = const {}}) {
    var engineClass = reflectClass(EngineEnum);
    engineClass.staticMembers.forEach((Symbol symbol, MethodMirror method) {
      if (symbol == #values) {
        return;
      }
      if (!method.isGetter) {
        return;
      }
      var enumName = MirrorSystem.getName(symbol);
      var engineValue = engineClass.getField(symbol).reflectee as EngineEnum;
      expect(engineValue, TypeMatcher<EngineEnum>());
      if (exceptions.containsKey(engineValue)) {
        var expectedResult = exceptions[engineValue];
        if (expectedResult == null) {
          expect(() {
            convert(engineValue);
          }, throwsException);
        } else {
          var apiValue = convert(engineValue);
          expect(apiValue, equals(expectedResult));
        }
      } else {
        var apiValue = convert(engineValue);
        expect((apiValue as dynamic).name, equals(enumName));
      }
    });
  }
}

class MockAnalysisError implements engine.AnalysisError {
  final MockSource? _source;
  final engine.ErrorCode? _errorCode;
  final int? _offset;
  final int? _length;
  final String? _message;
  final String? _correction;
  final DiagnosticMessage? _problemMessage;
  final String? _correctionMessage;

  @override
  List<DiagnosticMessage> contextMessages = <DiagnosticMessage>[];

  MockAnalysisError({
    MockSource? source,
    engine.ErrorCode? errorCode,
    int? offset,
    int? length,
    String? message,
    String? correction,
    DiagnosticMessage? problemMessage,
    String? correctionMessage,
  })  : _source = source,
        _errorCode = errorCode,
        _offset = offset,
        _length = length,
        _message = message,
        _correction = correction,
        _problemMessage = problemMessage,
        _correctionMessage = correctionMessage;

  @override
  String? get correction => _correction;

  @override
  String? get correctionMessage => _correctionMessage;

  @override
  engine.ErrorCode get errorCode => _errorCode!;

  @override
  int get length => _length!;

  @override
  String get message => _message!;

  @override
  int get offset => _offset!;

  @override
  DiagnosticMessage get problemMessage => _problemMessage!;

  @override
  Severity get severity => throw UnimplementedError();

  @override
  engine.Source get source => _source!;
}

class MockAnalysisSession implements AnalysisSession {
  Map<String, FileResult> fileResults = {};

  void addFileResult(FileResult result) {
    fileResults[result.path!] = result;
  }

  @override
  FileResult getFile(String path) => fileResults[path]!;

  @override
  dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
}

class MockErrorCode implements engine.ErrorCode {
  @override
  engine.ErrorType type;

  @override
  engine.ErrorSeverity errorSeverity;

  @override
  String name;

  @override
  String? url;

  MockErrorCode(
      {this.type = engine.ErrorType.COMPILE_TIME_ERROR,
      this.errorSeverity = engine.ErrorSeverity.ERROR,
      this.name = 'TEST_ERROR',
      this.url});

  @override
  String get correction {
    throw StateError('Unexpected invocation of correction');
  }

  @override
  bool get hasPublishedDocs => false;

  @override
  bool get isIgnorable => true;

  @override
  bool get isUnresolvedIdentifier => false;

  @override
  String get message {
    throw StateError('Unexpected invocation of message');
  }

  @override
  String get uniqueName {
    throw StateError('Unexpected invocation of uniqueName');
  }
}

class _ResolvedUnitResultImplMock implements engine.ResolvedUnitResultImpl {
  @override
  final engine.LineInfo lineInfo;

  @override
  final List<engine.AnalysisError> errors;

  _ResolvedUnitResultImplMock({
    required this.lineInfo,
    required this.errors,
  });

  @override
  dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
}