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/*
 * Copyright 2010-2015 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 org.jetbrains.kotlin.psi;

import com.intellij.extapi.psi.ASTWrapperPsiElement;
import com.intellij.lang.ASTNode;
import com.intellij.lang.Language;
import com.intellij.psi.PsiElementVisitor;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiReference;
import com.intellij.psi.PsiReferenceService;
import com.intellij.psi.impl.source.resolve.reference.ReferenceProvidersRegistry;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.kotlin.idea.KotlinLanguage;

public class KtElementImpl extends ASTWrapperPsiElement implements KtElement {
    public KtElementImpl(@NotNull ASTNode node) {
        super(node);
    }

    @NotNull
    @Override
    public Language getLanguage() {
        return KotlinLanguage.INSTANCE;
    }

    @Override
    public String toString() {
        return getNode().getElementType().toString();
    }

    @Override
    public final void accept(@NotNull PsiElementVisitor visitor) {
        if (visitor instanceof KtVisitor) {
            accept((KtVisitor) visitor, null);
        }
        else {
            visitor.visitElement(this);
        }
    }

    @NotNull
    @Override
    public KtFile getContainingKtFile() {
        PsiFile file = getContainingFile();
        assert file instanceof KtFile : "JetElement not inside JetFile: " + file + " " + file.getText();
        return (KtFile) file;
    }

    @Override
    public  void acceptChildren(@NotNull KtVisitor visitor, D data) {
        KtPsiUtil.visitChildren(this, visitor, data);
    }

    @Override
    public  R accept(@NotNull KtVisitor visitor, D data) {
        return visitor.visitKtElement(this, data);
    }

    @Override
    public PsiReference getReference() {
        PsiReference[] references = getReferences();
        if (references.length == 1) return references[0];
        else return null;
    }

    @NotNull
    @Override
    public PsiReference[] getReferences() {
        return ReferenceProvidersRegistry.getReferencesFromProviders(this, PsiReferenceService.Hints.NO_HINTS);
    }
}