/*
 *    Copyright 2012-2013 The Haohui Network Corporation
 */
package com.haohui.baidamei.client.web.json.template;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * <pre>
 * 模板资源读取工具
 * </pre>
 * 
 * @project baidamei
 * @author cevencheng <cevencheng@gmail.com>
 * @create 2012-11-24 下午9:21:51
 */
public class TemplateUtils {

	public static URL getResource(String name) {
		return TemplateUtils.class.getResource(name);
	}
	
	/**
	 * t1: 支持模板注释 和 jsp 代码级别注释
	 * <#-- freemarker 注释 -->
	 * <%!-- jsp 代码级别 注释 -->
	 * 
	 * @param templateName
	 * @param encoding
	 * @return
	 * @throws URISyntaxException 
	 */
	public static String processTemplateIntoString(String templateName, String encoding) {
		URL url = TemplateUtils.class.getResource(templateName);
		if (null == url) {
			throw new RuntimeException("模板文件[com/haohui/baidamei/client/web/json/template" + templateName + "]不存在");
		}
		if (null == encoding) {
			encoding = "utf-8";
		}
		encoding = encoding.trim();
		StringBuilder str = new StringBuilder();
		FileInputStream fs = null;
		InputStreamReader isr = null;
		String content = null;
		try {
			fs = new FileInputStream(new File(url.toURI()));
			isr = new InputStreamReader(fs, encoding);
			// 方法2：自己实现 buffer
			char[] buffer = new char[1024];
			int len = 0; 
			while ((len = isr.read(buffer)) > 0) {
				str.append(buffer, 0, len);
			}
			
			content = str.toString();
			String parttern = "<#--[\\w\\W\r\\n]*?-->";
			Pattern p1 = Pattern.compile(parttern);
			Matcher m1 = p1.matcher(content);
			content = m1.replaceAll(""); //去掉模板注释
			return content;
		} catch (Exception e) {
			throw new RuntimeException(e.getMessage(), e.getCause());
		} finally {
			try {
				isr.close();
				fs.close();
			} catch (IOException e) {
				throw new RuntimeException(e.getMessage(), e.getCause());
			}
		}
	}
	
	public static String processTemplateIntoString(String templateName, String encoding, Map<Object, Object> model) {
		URL url = TemplateUtils.class.getResource(templateName);
		if (null == url) {
			throw new RuntimeException("模板文件[com/haohui/baidamei/client/web/json/template" + templateName + "]不存在");
		}
		if (null == encoding) {
			encoding = "utf-8";
		}
		encoding = encoding.trim();
		StringBuilder str = new StringBuilder();
		FileInputStream fs = null;
		InputStreamReader isr = null;
		String content = null;
		try {
			fs = new FileInputStream(new File(url.toURI()));
			isr = new InputStreamReader(fs, encoding);
			// 方法2：自己实现 buffer
			char[] buffer = new char[1024];
			int len = 0; 
			while ((len = isr.read(buffer)) > 0) {
				str.append(buffer, 0, len);
			}
			
			content = str.toString();
			String parttern = "<#--[\\w\\W\r\\n]*?-->";
			Pattern p1 = Pattern.compile(parttern);
			Matcher m1 = p1.matcher(content);
			content = m1.replaceAll(""); //去掉模板注释
			
			// 处理模板变量 #{name} -->> 成功
			if (model.size() > 0) {
				for (Map.Entry<Object, Object> entry : model.entrySet()) {
					String regex = "#\\{" + entry.getKey() + "\\}";
					content = content.replaceAll(regex, entry.getValue().toString());
				}
			}
			
			return content;
		} catch (Exception e) {
			throw new RuntimeException(e.getMessage(), e.getCause());
		} finally {
			try {
				isr.close();
				fs.close();
			} catch (IOException e) {
				throw new RuntimeException(e.getMessage(), e.getCause());
			}
		}
	}
	
	public static void main(String[] args) {
		processTemplateIntoString("sss", null);
	}
}