// Copyright (c) 2012, 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.

package com.google.dart.compiler.resolver;

import com.google.common.collect.Maps;
import com.google.dart.compiler.ast.DartObsoleteMetadata;
import com.google.dart.compiler.ast.LibraryUnit;

import java.util.Collection;
import java.util.Map;

class LibraryElementImplementation extends AbstractNodeElement implements LibraryElement {

  private final Scope importScope = new Scope("import", this);
  private final Scope scope = new Scope("library", this, importScope);
  private final Map<String, Element> exportedElements = Maps.newHashMap();
  private LibraryUnit libraryUnit;
  private MethodElement entryPoint;
  private DartObsoleteMetadata metadata = DartObsoleteMetadata.EMPTY;

  public LibraryElementImplementation(LibraryUnit libraryUnit) {
    // TODO(ngeoffray): What should we pass the super? Should a LibraryUnit be a node?
    super(null, libraryUnit.getSource().getName());
    this.libraryUnit = libraryUnit;
  }

  @Override
  public boolean isInterface() {
    return false;
  }

  @Override
  public Scope getImportScope() {
    return importScope;
  }

  @Override
  public Scope getScope() {
    return scope;
  }

  public Element addExportedElements(Element element) {
    String name = element.getName();
    return exportedElements.put(name, element);
  }
  
  public Collection<Element> getExportedElements() {
    return exportedElements.values();
  }

  @Override
  public ElementKind getKind() {
    return ElementKind.LIBRARY;
  }

  @Override
  public LibraryUnit getLibraryUnit() {
    return libraryUnit;
  }

  @Override
  public void setEntryPoint(MethodElement element) {
    this.entryPoint = element;
  }

  @Override
  public MethodElement getEntryPoint() {
    return entryPoint;
  }

  @Override
  public Collection<Element> getMembers() {
    // TODO(ngeoffray): have a proper way to get all the declared top level elements.
    return scope.getElements().values();
  }

  @Override
  public Element lookupLocalElement(String name) {
    return scope.findLocalElement(name);
  }

  void addField(FieldElement field) {
    scope.declareElement(field.getName(), field);
  }

  void addMethod(MethodElement method) {
    scope.declareElement(method.getName(), method);
  }
  
  @Override
  public DartObsoleteMetadata getMetadata() {
    return metadata;
  }

  public void setMetadata(DartObsoleteMetadata metadata) {
    this.metadata = metadata;
  }
}