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/*
 * Copyright 2010-2014 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 org.jetbrains.jet.lang.psi;

import com.google.common.collect.Lists;
import com.intellij.lang.ASTNode;
import com.intellij.psi.PsiElement;
import com.intellij.psi.stubs.IStubElementType;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.jet.lang.psi.stubs.PsiJetModifierListStub;
import org.jetbrains.jet.lang.psi.stubs.elements.JetStubElementTypes;
import org.jetbrains.jet.lexer.JetModifierKeywordToken;
import org.jetbrains.jet.lexer.JetToken;

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

public abstract class JetModifierList extends JetElementImplStub {

    public JetModifierList(@NotNull PsiJetModifierListStub stub, @NotNull IStubElementType nodeType) {
        super(stub, nodeType);
    }

    public JetModifierList(@NotNull ASTNode node) {
        super(node);
    }

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

    @NotNull
    public List getAnnotations() {
        return getStubOrPsiChildrenAsList(JetStubElementTypes.ANNOTATION);
    }

    @NotNull
    public List getAnnotationEntries() {
        List entries = getStubOrPsiChildrenAsList(JetStubElementTypes.ANNOTATION_ENTRY);
        List answer = entries.isEmpty() ? null : Lists.newArrayList(entries);
        for (JetAnnotation annotation : getAnnotations()) {
            if (answer == null) answer = new ArrayList();
            answer.addAll(annotation.getEntries());
        }
        return answer != null ? answer : Collections.emptyList();
    }

    @NotNull
    public List getModifierNodes() {
        List modifierNodes = new ArrayList();

        ASTNode node = getNode().getFirstChildNode();
        while (node != null) {
            if (node.getElementType() instanceof JetModifierKeywordToken) {
                modifierNodes.add(node);
            }
            node = node.getTreeNext();
        }
        return modifierNodes;
    }

    public boolean hasModifier(JetModifierKeywordToken token) {
        PsiJetModifierListStub stub = getStub();
        if (stub != null) {
            return stub.hasModifier(token);
        }
        return getModifierNode(token) != null;
    }

    @Nullable
    public PsiElement getModifier(JetModifierKeywordToken token) {
        return findChildByType(token);
    }

    @Nullable
    public ASTNode getModifierNode(JetToken token) {
        ASTNode node = getNode().getFirstChildNode();
        while (node != null) {
            if (node.getElementType() == token) return node;
            node = node.getTreeNext();
        }
        return null;
    }


}