/* Copyright (c) 2008, University of Oslo, Norway
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 *  * Neither the name of the University of Oslo nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *      
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package no.uio.total.frida;

import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.HashMap;
import java.util.Map;

import javax.ws.rs.WebApplicationException;
import javax.ws.rs.ext.Provider;

import com.sun.ws.rest.spi.resource.Singleton;
import com.sun.ws.rest.spi.template.TemplateProcessor;

import freemarker.cache.ClassTemplateLoader;
import freemarker.cache.TemplateLoader;
import freemarker.template.Configuration;
import freemarker.template.TemplateException;

/**
 * A simple Freemarker template processor.
 */
@Provider
@Singleton
public class FreemarkerTemplateProcessor implements TemplateProcessor {

    private Configuration freemarkerCfg;
    private TemplateLoader templateLoader;
    
    private synchronized void init() {
        if (this.freemarkerCfg != null) {
            return;
        }
        freemarkerCfg = new Configuration();
        templateLoader = new ClassTemplateLoader(this.getClass(), "/");
        freemarkerCfg.setTemplateLoader(templateLoader);
    }
    
    public String resolve(String path) {

        if (this.freemarkerCfg == null) {
            init();
        }
        
        if (!path.endsWith(".ftl"))
            path = path + ".ftl";

        System.out.println("Hello world: " + path);
        try {
            if (freemarkerCfg.getTemplate(path) == null) {
                return null;
            }
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
        
        return path;        
    }

    public void writeTo(String resolvedPath, Object object, OutputStream out) throws IOException {
        Map<String, Object> model = new HashMap<String, Object>();
        model.put("resource", object);
        try {
            this.freemarkerCfg.getTemplate(resolvedPath).process(model, new OutputStreamWriter(out));
        } catch (TemplateException e) {
            throw new WebApplicationException(e);
        }
    }
}