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/**
 * Copyright (c) 2011-2017, James Zhan 詹波 ([email protected]).
 *
 * 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 com.jfinal.render;

import java.io.File;
import java.util.Locale;
import javax.servlet.ServletContext;
import com.jfinal.config.Constants;
import com.jfinal.kit.LogKit;
import com.jfinal.kit.PathKit;
import com.jfinal.template.Engine;

/**
 * RenderManager.
 */
public class RenderManager {
	
	private Engine engine;
	private Constants constants;
	private ServletContext servletContext;
	private IRenderFactory renderFactory = null;
	
	private static final RenderManager me = new RenderManager();
	private RenderManager() {}
	
	public static RenderManager me() {
		return me;
	}
	
	public IRenderFactory getRenderFactory() {
		return renderFactory;
	}
	
	public void setRenderFactory(IRenderFactory renderFactory) {
		if (renderFactory == null) {
			throw new IllegalArgumentException("renderFactory can not be null");
		}
		this.renderFactory = renderFactory;
	}
	
	public void init(Engine engine, Constants constants, ServletContext servletContext) {
		this.engine = engine;
		this.constants = constants;
		this.servletContext = servletContext;
		
		// init Render
		Render.init(constants.getEncoding(), constants.getDevMode());
		initTemplateRender();
		initFreeMarkerRender(servletContext);
		initVelocityRender(servletContext);
		initJspRender(servletContext);
		initFileRender(servletContext);
		
		// create renderFactory
		if (renderFactory == null) {
			renderFactory = new RenderFactory();
		}
		renderFactory.init(engine, constants, servletContext);
	}
	
	private void initTemplateRender() {
		TemplateRender.init(engine);
	}
	
	private void initFreeMarkerRender(ServletContext servletContext) {
		try {
			Class.forName("freemarker.template.Template");	// detect freemarker.jar
			FreeMarkerRender.init(servletContext, Locale.getDefault(), constants.getFreeMarkerTemplateUpdateDelay());
		} catch (ClassNotFoundException e) {
			// System.out.println("freemarker can not be supported!");
			LogKit.logNothing(e);
		}
	}
	
	private void initVelocityRender(ServletContext servletContext) {
		try {
			Class.forName("org.apache.velocity.VelocityContext");
			VelocityRender.init(servletContext);
		}
		catch (ClassNotFoundException e) {
			// System.out.println("Velocity can not be supported!");
			LogKit.logNothing(e);
		}
	}
	
	private void initJspRender(ServletContext servletContext) {
		try {
			Class.forName("javax.el.ELResolver");
			Class.forName("javax.servlet.jsp.JspFactory");
			com.jfinal.plugin.activerecord.ModelRecordElResolver.init(servletContext);
		}
		catch (ClassNotFoundException e) {
			// System.out.println("Jsp or JSTL can not be supported!");
			LogKit.logNothing(e);
		}
		catch (IllegalStateException e) {
			throw e;
		}
		catch (Exception e) {
			LogKit.logNothing(e);
		}
	}
	
	private void initFileRender(ServletContext servletContext) {
		String downloadPath = constants.getBaseDownloadPath();
		downloadPath = downloadPath.trim();
		downloadPath = downloadPath.replaceAll("\\\\", "/");
		
		String baseDownloadPath;
		// 如果为绝对路径则直接使用，否则把 downloadPath 参数作为项目根路径的相对路径
		if (PathKit.isAbsolutelyPath(downloadPath)) {
			baseDownloadPath = downloadPath;
		} else {
			baseDownloadPath = PathKit.getWebRootPath() + File.separator + downloadPath;
		}
		
		// remove "/" postfix
		if (baseDownloadPath.equals("/") == false) {
			if (baseDownloadPath.endsWith("/")) {
				baseDownloadPath = baseDownloadPath.substring(0, baseDownloadPath.length() - 1);
			}
		}
		
		FileRender.init(baseDownloadPath, servletContext);
	}
	
	public Engine getEngine() {
		return engine;
	}
	
	public Constants getConstants() {
		return constants;
	}
	
	public ServletContext getServletContext() {
		return servletContext;
	}
}