// 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 services.src.refactoring.rename_constructor;

import 'dart:async';

import 'package:analysis_server/src/protocol_server.dart' hide Element;
import 'package:analysis_server/src/services/correction/source_range.dart';
import 'package:analysis_server/src/services/correction/status.dart';
import 'package:analysis_server/src/services/correction/util.dart';
import 'package:analysis_server/src/services/refactoring/naming_conventions.dart';
import 'package:analysis_server/src/services/refactoring/refactoring.dart';
import 'package:analysis_server/src/services/refactoring/refactoring_internal.dart';
import 'package:analysis_server/src/services/refactoring/rename.dart';
import 'package:analysis_server/src/services/search/hierarchy.dart';
import 'package:analysis_server/src/services/search/search_engine.dart';
import 'package:analyzer/src/generated/element.dart';
import 'package:analyzer/src/generated/java_core.dart';
import 'package:analyzer/src/generated/source.dart';

/**
 * A [Refactoring] for renaming [ConstructorElement]s.
 */
class RenameConstructorRefactoringImpl extends RenameRefactoringImpl {
  RenameConstructorRefactoringImpl(
      SearchEngine searchEngine, ConstructorElement element)
      : super(searchEngine, element);

  @override
  ConstructorElement get element => super.element as ConstructorElement;

  @override
  String get refactoringName {
    return "Rename Constructor";
  }

  @override
  Future<RefactoringStatus> checkFinalConditions() {
    RefactoringStatus result = new RefactoringStatus();
    _analyzePossibleConflicts(result);
    return new Future.value(result);
  }

  @override
  RefactoringStatus checkNewName() {
    RefactoringStatus result = super.checkNewName();
    result.addStatus(validateConstructorName(newName));
    return result;
  }

  @override
  Future fillChange() async {
    if (!element.isSynthetic) {
      // prepare references
      List<SearchMatch> matches = await searchEngine.searchReferences(element);
      List<SourceReference> references = getSourceReferences(matches);
      // append declaration
      references.add(_createDeclarationReference());
      // update references
      String replacement = newName.isEmpty ? '' : '.${newName}';
      for (SourceReference reference in references) {
        reference.addEdit(change, replacement);
      }
    }
  }

  void _analyzePossibleConflicts(RefactoringStatus result) {
    // check if there are members with "newName" in the same ClassElement
    ClassElement parentClass = element.enclosingElement;
    for (Element newNameMember in getChildren(parentClass, newName)) {
      String message = format(
          "Class '{0}' already declares {1} with name '{2}'.",
          parentClass.displayName,
          getElementKindName(newNameMember),
          newName);
      result.addError(message, newLocation_fromElement(newNameMember));
    }
  }

  SourceReference _createDeclarationReference() {
    SourceRange sourceRange;
    if (element.periodOffset != null) {
      sourceRange = rangeStartEnd(element.periodOffset, element.nameEnd);
    } else {
      sourceRange = rangeStartLength(element.nameEnd, 0);
    }
    String file = element.source.fullName;
    return new SourceReference(file, sourceRange, element, true, true);
  }
}