/*
 * Copyright 2000-2017 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.psi.impl.source.tree.java;

import com.intellij.lang.ASTNode;
import com.intellij.psi.*;
import com.intellij.psi.impl.source.SourceTreeToPsiMap;
import com.intellij.psi.impl.source.tree.*;
import com.intellij.psi.scope.ElementClassHint;
import com.intellij.psi.scope.PsiScopeProcessor;
import com.intellij.psi.tree.TokenSet;
import com.intellij.util.CharTable;
import org.jetbrains.annotations.NotNull;

public class PsiDeclarationStatementImpl extends CompositePsiElement implements PsiDeclarationStatement {
  private static final TokenSet DECLARED_ELEMENT_BIT_SET = TokenSet.create(JavaElementType.LOCAL_VARIABLE, JavaElementType.CLASS);

  public PsiDeclarationStatementImpl() {
    super(JavaElementType.DECLARATION_STATEMENT);
  }

  @Override
  public PsiElement @NotNull [] getDeclaredElements() {
    return getChildrenAsPsiElements(DECLARED_ELEMENT_BIT_SET, PsiElement.ARRAY_FACTORY);
  }

  @Override
  public int getChildRole(@NotNull ASTNode child) {
    if (child.getElementType() == JavaTokenType.COMMA) return ChildRole.COMMA;
    return super.getChildRole(child);
  }

  @Override
  public void deleteChildInternal(@NotNull ASTNode child) {
    if (DECLARED_ELEMENT_BIT_SET.contains(child.getElementType())) {
      PsiElement[] declaredElements = getDeclaredElements();
      int length = declaredElements.length;

      if (length == 1) {
        getTreeParent().deleteChildInternal(this);
        return;
      }

      if (length > 0) {
        if (SourceTreeToPsiMap.psiElementToTree(declaredElements[length - 1]) == child) {
          removeCommaBefore(child);
          CharTable charTable = SharedImplUtil.findCharTableByTree(this);
          LeafElement semicolon = Factory.createSingleLeafElement(JavaTokenType.SEMICOLON, ";", charTable, getManager());
          SourceTreeToPsiMap.psiToTreeNotNull(declaredElements[length - 2]).addChild(semicolon, null);
        }
        else if (SourceTreeToPsiMap.psiElementToTree(declaredElements[0]) == child) {
          CompositeElement next = (CompositeElement)SourceTreeToPsiMap.psiToTreeNotNull(declaredElements[1]);
          ASTNode copyChild = child.copyElement();
          ASTNode nameChild = ((CompositeElement)copyChild).findChildByRole(ChildRole.NAME);
          assert nameChild != null;
          removeCommaBefore(next);
          next.addInternal((TreeElement)copyChild.getFirstChildNode(), nameChild.getTreePrev(), null, Boolean.FALSE);
        }
        else {
          removeCommaBefore(child);
        }
      }
    }

    super.deleteChildInternal(child);

    TreeElement first = getFirstChildNode();
    if (first != null && !DECLARED_ELEMENT_BIT_SET.contains(first.getElementType())) {
      TreeElement last = first;
      while (true) {
        TreeElement next = last.getTreeNext();
        if (next == null || DECLARED_ELEMENT_BIT_SET.contains(next.getElementType())) break;
        last = next;
      }
      getTreeParent().addInternal(first, last, this, Boolean.TRUE);
    }
  }

  private void removeCommaBefore(ASTNode child) {
    ASTNode prev = child;
    do {
      prev = prev.getTreePrev();
    }
    while (prev != null && ElementType.JAVA_COMMENT_OR_WHITESPACE_BIT_SET.contains(prev.getElementType()));
    if (prev != null && prev.getElementType() == JavaTokenType.COMMA) {
      deleteChildInternal(prev);
    }
  }

  @Override
  public void accept(@NotNull PsiElementVisitor visitor) {
    if (visitor instanceof JavaElementVisitor) {
      ((JavaElementVisitor)visitor).visitDeclarationStatement(this);
    }
    else {
      visitor.visitElement(this);
    }
  }

  @Override
  public boolean processDeclarations(@NotNull PsiScopeProcessor processor,
                                     @NotNull ResolveState state,
                                     PsiElement lastParent,
                                     @NotNull PsiElement place) {
    processor.handleEvent(PsiScopeProcessor.Event.SET_DECLARATION_HOLDER, this);

    for (PsiElement element : getDeclaredElements()) {
      if (element != lastParent) {
        if (element instanceof PsiVariable && ((PsiVariable)element).isUnnamed() &&
            !Boolean.TRUE.equals(processor.getHint(ElementClassHint.PROCESS_UNNAMED_VARIABLES))) continue;
        if (!processor.execute(element, state)) return false;
      }
      else {
        ElementClassHint hint = processor.getHint(ElementClassHint.KEY);
        if (lastParent instanceof PsiClass && (hint == null || hint.shouldProcess(ElementClassHint.DeclarationKind.CLASS))) {
          if (!processor.execute(lastParent, state)) return false;
        }
      }
    }

    return true;
  }

  @Override
  public String toString() {
    return "PsiDeclarationStatement";
  }
}