// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
package com.jetbrains.python.psi.impl;

import com.intellij.lang.ASTNode;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiListLikeElement;
import com.intellij.psi.PsiNamedElement;
import com.intellij.psi.tree.TokenSet;
import com.intellij.util.ArrayUtil;
import com.jetbrains.python.PyElementTypes;
import com.jetbrains.python.psi.*;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.List;


public class PyGlobalStatementImpl extends PyElementImpl implements PyGlobalStatement, PsiListLikeElement {
  private static final TokenSet TARGET_EXPRESSION_SET = TokenSet.create(PyElementTypes.TARGET_EXPRESSION);

  public PyGlobalStatementImpl(ASTNode astNode) {
    super(astNode);
  }

  @Override
  protected void acceptPyVisitor(PyElementVisitor pyVisitor) {
    pyVisitor.visitPyGlobalStatement(this);
  }

  @Override
  public PyTargetExpression @NotNull [] getGlobals() {
    return childrenToPsi(TARGET_EXPRESSION_SET, PyTargetExpression.EMPTY_ARRAY);
  }

  public @Nullable PsiNamedElement getNamedElement(final @NotNull String the_name) {
    return PyUtil.IterHelper.findName(getNamedElements(), the_name);
  }

  @Override
  public void addGlobal(final String name) {
    final PyElementGenerator pyElementGenerator = PyElementGenerator.getInstance(getProject());
    add(pyElementGenerator.createComma().getPsi());
    add(pyElementGenerator.createFromText(LanguageLevel.getDefault(), PyGlobalStatement.class, "global " + name).getGlobals()[0]);
  }

  @Override
  public void deleteChildInternal(@NotNull ASTNode child) {
    if (ArrayUtil.contains(child.getPsi(), getGlobals())) {
      PyPsiUtils.deleteAdjacentCommaWithWhitespaces(this, child.getPsi());
    }
    super.deleteChildInternal(child);
  }

  @Override
  public @NotNull List<? extends PsiElement> getComponents() {
    return getNamedElements();
  }
}
