/*
 * 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 rewrite.org.apache.myfaces.extensions.scripting.core.monitor;

import rewrite.org.apache.myfaces.extensions.scripting.core.common.ScriptingConst;
import rewrite.org.apache.myfaces.extensions.scripting.core.common.util.ClassUtils;
import rewrite.org.apache.myfaces.extensions.scripting.core.context.WeavingContext;

import java.io.File;
import java.util.Collection;
import java.util.logging.Logger;

/**
 * @author Werner Punz (latest modification by $Author$)
 * @version $Revision$ $Date$
 */

public class ClassResource extends WatchedResource
{

    Logger logger = Logger.getLogger(this.getClass().getName());

    /*
    * volatile due to the ram concurrency behavior
    * of the instance vars jdk 5+
    */

    //TODO we probably can drop the file definitions
    //the class has all meta data internally via findResource
    //on its corresponding classloader
    //caching the info however probably is faster
    volatile Class _aClass = null;
    volatile File _sourceFile;

    volatile int _scriptingEngine = ScriptingConst.ENGINE_TYPE_JSF_NO_ENGINE;
    /*non initial change for delta change investigation*/
    volatile boolean changedForCompile = false;


    //todo clean up the sourcepath and filename

    //--- todo move this into a separate resource handling facility


    @Override
    /**
     * returns the source file in this case
     */
    public File getFile()
    {
        try
        {
            return _sourceFile;
        }
        catch (NullPointerException ex)
        {
            return null;
        }
    }

    public void setFile(File sourceFile)
    {
        _sourceFile = sourceFile;
    }

    public Class getAClass()
    {
        return _aClass;
    }

    public void setAClass(Class aClass)
    {
        this._aClass = aClass;
    }

    public int getScriptingEngine()
    {
        return _scriptingEngine;
    }

    public void setScriptingEngine(int scriptingEngine)
    {
        this._scriptingEngine = scriptingEngine;
    }

    @Override
    protected Object clone() throws CloneNotSupportedException
    {
        ClassResource retVal = (ClassResource) super.clone();
        return retVal;
    }

    public String getSourceFile()
    {
        return _sourceFile.getAbsolutePath().substring(getSourceDir().length());
    }

    public String getSourceDir()
    {
        Collection<String> sourceRoots = WeavingContext.getInstance().getConfiguration().getSourceDirs(_scriptingEngine);
        String fileDir = _sourceFile.getAbsolutePath();
        fileDir = fileDir.replaceAll("\\\\", "/");
        for (String sourceRoot : sourceRoots)
        {
            sourceRoot = sourceRoot.replaceAll("\\\\", "/");
            if (fileDir.startsWith(sourceRoot))
            {
                return sourceRoot;
            }
        }
        return null;
    }


    /**
     * identifier for this resource is the classname
     *
     * @return
     */
    public String getIdentifier()
    {
        String targetDir = WeavingContext.getInstance().getConfiguration().getCompileTarget().getAbsolutePath();
        String className = ClassUtils.relativeFileToClassName(getSourceFile());

        return className;
    }

    public void setTainted(boolean value)
    {
        if (isTainted()) return;
        if (value)
        {
            //TODO add logging event here
            logger.info("[EXT-SCRIPTING] tainting " + getSourceFile());
        }
        tainted = true;
    }

    /**
     * @return true if the source file has been modified compared to its classfile
     */
    public boolean isTainted()
    {
        return tainted;
    }

    public boolean needsRecompile()
    {
        String targetDir = WeavingContext.getInstance().getConfiguration().getCompileTarget().getAbsolutePath();
        String className = ClassUtils.relativeFileToClassName(getSourceFile());
        className = targetDir + File.separator + className.replaceAll("\\.", File.separator) + ".class";
        File targetClass = new File(className);
        return !targetClass.exists() || targetClass.lastModified() < _sourceFile.lastModified();
    }

    public boolean stillExists()
    {
        return _sourceFile.exists();
    }

    public boolean isChangedForCompile()
    {
        return changedForCompile;
    }

    public void setChangedForCompile(boolean changedForCompile)
    {
        this.changedForCompile = changedForCompile;
    }
}