/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.intellij.util.xml.stubs;

import com.intellij.openapi.util.Comparing;
import com.intellij.psi.stubs.ObjectStubBase;
import com.intellij.util.SmartList;
import com.intellij.util.io.StringRef;
import com.intellij.util.xml.EvaluatedXmlNameImpl;
import com.intellij.util.xml.XmlName;
import com.intellij.util.xml.impl.CollectionElementInvocationHandler;
import com.intellij.util.xml.impl.DomChildDescriptionImpl;
import com.intellij.util.xml.impl.DomInvocationHandler;
import com.intellij.util.xml.impl.DomManagerImpl;
import com.intellij.xml.util.XmlUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.Collections;
import java.util.List;

/**
 * @author Dmitry Avdeev
 *         Date: 8/2/12
 */
public abstract class DomStub extends ObjectStubBase<DomStub> {

  protected final StringRef myLocalName;
  private final StringRef myNamespace;
  private DomInvocationHandler myHandler;

  public DomStub(DomStub parent, @NotNull StringRef localName, StringRef namespace) {
    super(parent);
    myNamespace = namespace;
    if (parent != null) {
      ((ElementStub)parent).addChild(this);
    }
    myLocalName = localName;
  }

  @Override
  public abstract List<DomStub> getChildrenStubs();

  public String getName() {
    return myLocalName.getString();
  }

  @Nullable
  public String getNamespaceKey() {
    return myNamespace == null ? null : myNamespace.getString();
  }

  public List<DomStub> getChildrenByName(final CharSequence name, @Nullable final String nsKey) {
    final List<DomStub> stubs = getChildrenStubs();
    if (stubs.isEmpty()) {
      return Collections.emptyList();
    }

    final String s = nsKey == null ? "" : nsKey;
    final List<DomStub> result = new SmartList<DomStub>();
    //noinspection ForLoopReplaceableByForEach
    for (int i = 0, size = stubs.size(); i < size; i++) {
      final DomStub stub = stubs.get(i);
      if (XmlUtil.getLocalName(stub.getName()).equals(name) &&
          Comparing.equal(s, stub.getNamespaceKey())) {
        result.add(stub);
      }
    }
    return result;
  }

  @Nullable
  public AttributeStub getAttributeStub(final XmlName name) {
    final List<DomStub> stubs = getChildrenStubs();
    if (stubs.isEmpty()) {
      return null;
    }

    //noinspection ForLoopReplaceableByForEach
    for (int i = 0, size = stubs.size(); i < size; i++) {
      final DomStub stub = stubs.get(i);
      if (stub instanceof AttributeStub &&
          stub.getName().equals(name.getLocalName())) {
        return (AttributeStub)stub;
      }
    }
    return null;
  }

  @Nullable
  public ElementStub getElementStub(String name, int index) {
    List<DomStub> stubs = getChildrenStubs();
    int i = 0;
    for (DomStub stub : stubs) {
      if (stub instanceof ElementStub && name.equals(stub.getName()) && i++ == index) {
        return (ElementStub)stub;
      }
    }
    return null;
  }

  public synchronized DomInvocationHandler getOrCreateHandler(DomChildDescriptionImpl description, DomManagerImpl manager) {
    if (myHandler == null) {
      XmlName name = description.getXmlName();
      EvaluatedXmlNameImpl evaluatedXmlName = EvaluatedXmlNameImpl.createEvaluatedXmlName(name, name.getNamespaceKey(), true);
      myHandler = new CollectionElementInvocationHandler(evaluatedXmlName, description, manager, (ElementStub)this);
    }
    return myHandler;
  }

  public DomInvocationHandler getHandler() {
    return myHandler;
  }

  public void setHandler(DomInvocationHandler handler) {
    myHandler = handler;
  }

  public boolean isCustom() {
    return false;
  }

  public abstract int getIndex();
}