/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.netbeans.modules.j2ee.jpa.verification.rules.entity;

import com.sun.source.tree.Tree;
import com.sun.source.util.TreePath;
import javax.lang.model.element.NestingKind;
import javax.lang.model.element.TypeElement;
import org.netbeans.modules.j2ee.jpa.model.JPAAnnotations;
import org.netbeans.modules.j2ee.jpa.model.ModelUtils;
import org.netbeans.modules.j2ee.jpa.verification.JPAProblemContext;
import org.netbeans.modules.j2ee.jpa.verification.common.Utilities;
import org.netbeans.spi.editor.hints.ErrorDescription;
import org.netbeans.spi.editor.hints.Severity;
import org.netbeans.spi.java.hints.ErrorDescriptionFactory;
import org.netbeans.spi.java.hints.Hint;
import org.netbeans.spi.java.hints.HintContext;
import org.netbeans.spi.java.hints.TriggerPattern;
import org.netbeans.spi.java.hints.TriggerPatterns;
import org.openide.util.NbBundle;

/**
 * @author Sanjeeb.Sahoo@Sun.COM
 * @author Tomasz.Slota@Sun.COM
 */
@Hint(id = "o.n.m.j2ee.jpa.verification.TopLevelClass",
        displayName = "#TopLevelClass.display.name",
        description = "#TopLevelClass.desc",
        category = "javaee/jpa",
        enabled = true,
        severity = Severity.ERROR,
        suppressWarnings = "TopLevelClass")
@NbBundle.Messages({
    "TopLevelClass.display.name=Verify jpa class is top level class",
    "TopLevelClass.desc=JPA classes must not be inner classes"})
public class TopLevelClass {
    
    @TriggerPatterns(value = {
        @TriggerPattern(value = JPAAnnotations.ENTITY),
        @TriggerPattern(value = JPAAnnotations.EMBEDDABLE),
        @TriggerPattern(value = JPAAnnotations.MAPPED_SUPERCLASS)})
    public static ErrorDescription apply(HintContext hc) {
        if (hc.isCanceled() || (hc.getPath().getLeaf().getKind() != Tree.Kind.IDENTIFIER || hc.getPath().getParentPath().getLeaf().getKind() != Tree.Kind.ANNOTATION)) {//NOI18N
            return null;//we pass only if it is an annotation
        }

        final JPAProblemContext ctx = ModelUtils.getOrCreateCachedContext(hc);
        if (ctx == null || hc.isCanceled()) {
            return null;
        }

        TypeElement subject = ctx.getJavaClass();
        
        if (subject.getNestingKind() == NestingKind.TOP_LEVEL){
            return null;
        }
        TreePath par = hc.getPath();
        while (par != null && par.getParentPath() != null && par.getLeaf().getKind() != Tree.Kind.CLASS) {
            par = par.getParentPath();
        }

        Utilities.TextSpan underlineSpan = Utilities.getUnderlineSpan(
                ctx.getCompilationInfo(), par.getLeaf());

        return ErrorDescriptionFactory.forSpan(
                hc,
                underlineSpan.getStartOffset(),
                underlineSpan.getEndOffset(),
                NbBundle.getMessage(TopLevelClass.class, "MSG_NestedClassAsEntity"));        
    }
}
