/* Copyright 2004-2005 Graeme Rocher
 *
 * 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.codehaus.groovy.grails.support;

import grails.util.BuildSettings;
import grails.util.BuildSettingsHolder;
import grails.util.Metadata;
import org.apache.commons.lang.StringUtils;
import org.codehaus.groovy.grails.commons.GrailsApplication;
import org.codehaus.groovy.grails.commons.GrailsResourceUtils;
import org.codehaus.groovy.grails.plugins.GrailsPluginUtils;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;

import java.io.IOException;


/**
 *
 * A ResourceLoader that allows files references like /WEB-INF/grails-app to be loaded from ./grails-app to support
 * the difference between wAR deployment and run-app
 *
 * @author Graeme Rocher
 * @since 1.0
 *        <p/>
 *        Created: Jan 30, 2008
 */
public class DevelopmentResourceLoader extends DefaultResourceLoader{
    private String baseLocation = ".";
    private static final String PLUGINS_PREFIX = "plugins/";
    private static final String SLASH = "/";


    public DevelopmentResourceLoader(GrailsApplication application) {
        super();
    }

    public DevelopmentResourceLoader() {
        super();
    }

    public DevelopmentResourceLoader(GrailsApplication application, String baseLocation) {
        this(application);
        this.baseLocation = baseLocation;
    }

    public Resource getResource(String location) {
        if(Metadata.getCurrent().isWarDeployed()) {
            return super.getResource(location);
        }
        else {
            location = getRealLocationInProject(location);
            return super.getResource(location);
        }
    }

    /**
     * Retrieves the real location of a GSP within a Grails project
     * @param location The location of the GSP at deployment time
     * @return The location of the GSP at development time
     */
    protected String getRealLocationInProject(String location) {

        if(!location.startsWith(SLASH)) location = SLASH +location;
        
        if(location.startsWith(GrailsResourceUtils.WEB_INF)) {
            final String noWebInf = location.substring(GrailsResourceUtils.WEB_INF.length() + 1);
            final String defaultPath = "file:" + baseLocation + SLASH + noWebInf;
            if(noWebInf.startsWith(PLUGINS_PREFIX)) {
                BuildSettings settings = BuildSettingsHolder.getSettings();
                String pluginPath = StringUtils.substringAfter(noWebInf, SLASH);
                String pluginName = StringUtils.substringBefore(pluginPath, SLASH);
                String remainingPath = StringUtils.substringAfter(pluginPath, SLASH);
                Resource r = GrailsPluginUtils.getPluginDirForName(pluginName);
                if(r != null) {
                    try {
                        return "file:" + r.getFile().getAbsolutePath() + SLASH + remainingPath;
                    }
                    catch (IOException e) {
                        return defaultPath;
                    }
                }
                else if(settings!=null){
                        return "file:" + settings.getProjectPluginsDir().getAbsolutePath() + SLASH + pluginName + SLASH + remainingPath;    
                }
                else {
                    return defaultPath;
                }
            }
            else {
                return defaultPath;
            }
        }
        else {
            return GrailsResourceUtils.WEB_APP_DIR+location;
        }
    }

    private boolean isNotMessageBundle(String location) {
        return !location.endsWith(".properties");
    }
}

