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package com.logicbus.backend;

import javax.servlet.http.HttpServletRequest;

import com.anysoft.util.Configurable;
import com.anysoft.util.Properties;
import com.logicbus.models.catalog.Path;


/**
 * 缺省实现的Normalizer
 * 
 * @author duanyy
 * 
 * @version 1.2.7.2 [20140910 duanyy] 

 * - 增加基于Properties的构造函数
 * 
 * @version 1.6.4.4 [20150910 duanyy] 

 * - ServiceDetailQuery的快捷方式改为detail 

 *
 * @version 1.6.14.12 [20210617 duanyy] 

 * - 继承Configurable接口，便于动态创建 

 * - 支持路径模版 

 */
public class DefaultNormalizer implements Normalizer,PathPatternSupport, Configurable {
	protected ServicePathTrie pathTrie = new ServicePathTrie();
	public DefaultNormalizer(Properties settings) {

	}

	public DefaultNormalizer(){

	}

	@Override
	public void configure(Properties p){

	}

	@Override
	public Path normalize(Context ctx, HttpServletRequest request) {
		String path = request.getPathInfo();
		String queryString = request.getQueryString();

		String id;
		
		if (path == null || path.equals("/")){
			//查询所有服务信息
			id = "/core/ServiceQuery";
		}
		else
		{
			int start = path.indexOf("/");
			id = path.substring(start);
			if (queryString != null && queryString.equals("detail")){
				ctx.SetValue("service", id);
				id = "/core/ServiceDetailQuery";
			}else{
				if (queryString != null && queryString.equals("reload")){
					ctx.SetValue("service", id);
					id = "/core/ServiceReload";						
				}else{
					if (queryString != null && queryString.equals("resume")){
						ctx.SetValue("service", id);
						id = "/core/ServiceResume";
					}else{
						if (queryString != null && queryString.equals("pause")){
							ctx.SetValue("service", id);
							id = "/core/ServicePause";
						}
					}
				}
			}
		}
		
		return createPath(id,ctx,request);
	}

	/**
	 * 根据预生成的ID来生成路径
	 * 
	 * 

	 * 可在子类实现中更改所生成的路径，例如将某个目录的服务都重定向到某个服务，在将原路径设置为参数。

	 * 
	 * {@code
	 * protected Path createPath(String id,Context ctx,HttpServletRequest request){
	 *       if (id.startsWith("/project")){
	 *       	ctx.setValue("path",id);
	 *       	return new Path("");
	 *       }else{
	 *       	return new Path(id);
	 *       }
	 * }
	 * }
	 * 
	 * @param id 服务ID
	 * @param ctx 上下文
	 * @param request Http请求
	 * @return 转换后的路径
	 */
	protected Path createPath(String id,Context ctx, HttpServletRequest request){
		String path = pathTrie.match(id,ctx);
		if (path == null){
			path = id;
		}
		return new Path(path);
	}

	@Override
	public void apply(String path, String pattern) {
		pathTrie.insert(pattern,path);
	}
}