/*
 * Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies).
 * All rights reserved.
 * This component and the accompanying materials are made available
 * under the terms of the License "Eclipse Public License v1.0"
 * which accompanies this distribution, and is available
 * at the URL "http://www.eclipse.org/legal/epl-v10.html".
 *
 * Initial Contributors:
 * Nokia Corporation - initial contribution.
 *
 * Contributors:
 *
 * Description: 
 *
 */
package com.nokia.helium.antlint.ant.types;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.apache.tools.ant.Target;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.nokia.helium.antlint.ant.AntlintException;

/**
 * <code>CheckAntCall</code> is used to check whether antcall is used with no param elements and
 * calls the target with no dependencies
 * 
 * <pre>
 * Usage:
 * 
 *  &lt;antlint&gt;
 *       &lt;fileset id=&quot;antlint.files&quot; dir=&quot;${antlint.test.dir}/data&quot;&gt;
 *               &lt;include name=&quot;*.ant.xml&quot;/&gt;
 *               &lt;include name=&quot;*build.xml&quot;/&gt;
 *               &lt;include name=&quot;*.antlib.xml&quot;/&gt;
 *       &lt;/fileset&gt;
 *       &lt;CheckAntCall&quot; severity=&quot;error&quot; enabled=&quot;true&quot;/&gt;
 *  &lt;/antlint&gt;
 * </pre>
 * 
 * @ant.task name="CheckAntCall" category="AntLint"
 */
public class CheckAntCall extends AbstractCheck {

    private File antFile;

    /**
     * {@inheritDoc}
     */
    public void run(Element node) {
        if (node.getName().equals("target")) {
            checkAntCalls(node);
        }
    }

    /**
     * Check against the given node.
     * 
     * @param node is the node to check.
     */
    @SuppressWarnings("unchecked")
    private void checkAntCalls(Element node) {
        if (node.elements("antcall") != null) {
            List<Element> antcallList = node.elements("antcall");
            for (Element antcallElement : antcallList) {
                String antcallName = antcallElement.attributeValue("target");
                if (((node.elements("param") == null) || (node.elements("param") != null && node.elements("param").isEmpty()))
                    && !checkTargetDependency(antcallName)) {
                    this.getReporter().report(this.getSeverity(), "<antcall> is used with no param elements and calls the target "
                        + antcallName
                        + " that has no dependencies! (<runtarget> could be used instead.)", this.getAntFile(), 0);
                }
            }
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.nokia.helium.antlint.ant.types.Check#run(java.io.File)
     */
    public void run(File antFilename) throws AntlintException {

        this.antFile = antFilename;
        SAXReader saxReader = new SAXReader();
        Document doc;
        List<Element> targetNodes = new ArrayList<Element>();

        try {
            doc = saxReader.read(antFilename);
            elementTreeWalk(doc.getRootElement(), "target", targetNodes);
        }
        catch (DocumentException e) {
            throw new AntlintException("Invalid XML file " + e.getMessage());
        }

        for (Element targetNode : targetNodes) {
            run(targetNode);
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.tools.ant.types.DataType#toString()
     */
    public String toString() {
        return "CheckAntCall";
    }

    /**
     * Check the availability dependent targets of the given target.
     * 
     * @param targetName is the target for which dependent targets to be loked up.
     * @return true, if the dependant targets are available; otherwise false
     */
    private boolean checkTargetDependency(String targetName) {
        boolean dependencyCheck = false;
        Target targetDependency = (Target) getProject().getTargets().get(targetName);
        dependencyCheck = targetDependency != null
            && targetDependency.getDependencies().hasMoreElements();
        return dependencyCheck;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.nokia.helium.antlint.ant.types.Check#getAntFile()
     */
    public File getAntFile() {
        return this.antFile;
    }

}