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/*
 * 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.apache.struts2.components.template;

import com.opensymphony.xwork2.inject.Inject;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.views.velocity.VelocityManager;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.context.Context;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.Writer;
import java.util.List;
import java.util.Map;

/**
 * Velocity based template engine.
 */
public class VelocityTemplateEngine extends BaseTemplateEngine {
    private static final Logger LOG = LogManager.getLogger(VelocityTemplateEngine.class);
    
    private VelocityManager velocityManager;
    
    @Inject
    public void setVelocityManager(VelocityManager mgr) {
        this.velocityManager = mgr;
    }

    public void renderTemplate(TemplateRenderingContext templateContext) throws Exception {
        // get the various items required from the stack
        Map actionContext = templateContext.getStack().getContext();
        ServletContext servletContext = (ServletContext) actionContext.get(ServletActionContext.SERVLET_CONTEXT);
        HttpServletRequest req = (HttpServletRequest) actionContext.get(ServletActionContext.HTTP_REQUEST);
        HttpServletResponse res = (HttpServletResponse) actionContext.get(ServletActionContext.HTTP_RESPONSE);

        // prepare velocity
        velocityManager.init(servletContext);
        VelocityEngine velocityEngine = velocityManager.getVelocityEngine();

        // get the list of templates we can use
        List