package com.qxueyou.scc.exercise.service.impl;

import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang3.StringUtils;

import com.qxueyou.scc.exercise.model.ExerciseParse;
import com.qxueyou.scc.exercise.service.impl.node.Doc;
import com.qxueyou.scc.exercise.service.impl.node.Item;
import com.qxueyou.scc.exercise.service.impl.node.ItemType;
import com.qxueyou.scc.exercise.service.impl.node.Option;
import com.qxueyou.scc.exercise.service.impl.parser.ItemParser;
import com.qxueyou.scc.exercise.service.impl.parser.OptionParser;

public class Handler {
	
	private Doc doc;
	
	private Node currentNode;
	
	/** ʧ°Ü */
	public static final Integer HANDLER_RESULT_FAIL = 1 ;
	
	/** ÉÏÒ»ÀàÐÍ */
	public static final Integer HANDLER_RESULT_CONTINUE = 2;
	
	/** ³É¹¦*/
	public static final Integer HANDLER_RESULT_SUCCESS = 3;
	
	/** УÑéÊÇ·ñÓÐÖÐÎÄ */
	private static String regEx = "[\u4e00-\u9fa5]"; 
	private static Pattern pat = Pattern.compile(regEx); 
	
	public Handler(){
		doc = new Doc();
		currentNode = doc;
	}
	
	/**
	 * ½âÎöÎı¾,ÿ´Î¶ÁÈ¡Ò»¸ö¶ÎÂä
	 * @param content ¶ÎÂäÎı¾ÄÚÈÝ
	 */
	public ExerciseParse parse(String content){
		
		ParseResult result = null;
		
		content = content.replace((char)12288, (char)32);
		content = content.replace((char)160, (char)32);
		
		//½«µÃµ½µÄÎı¾È«½Çת°ë½Ç
		//content = formatFullToHalf(content);
		content = content.replace('£¨', '(');
		content = content.replace('£©', ')');
		
		// ·ÇÈ«²¿Ó¢ÎÄÌâ   ·ÇÈ«²¿¿Õ¸ñ£¬  ÐèÒª½«¿Õ¸ñÌæ»»µô
		if(isContentContainsChinese(content) || content.trim().isEmpty()){
			content = content.replace(" ", "");
		}
		
		content = content.replace("\t", "");
		
		if(StringUtils.isEmpty(content)||content.equals("\r")){
			return new ExerciseParse(HANDLER_RESULT_SUCCESS,content);
		}
		
		//ÊÇ·ñÐèÒªÈËΪȥµô»Ø³µ
		content = content.replace("\r", "");

		int count = 0;
		
		do{
			result = currentNode.getParser().parse(currentNode, content);
			
			if(result.isSuccess()){
				if(ParseResult.STEP_CUR.equals(result.getNextStep())){
					//³É¹¦ºó£¬È¡µÃµ±Ç°parser
					generateLastSuccessType(doc,currentNode,result.getNextNode());
					return new ExerciseParse(HANDLER_RESULT_SUCCESS,content);
				}
				if(ParseResult.STEP_PRE.equals(result.getNextStep())){
					currentNode = currentNode.getParent();
					return new ExerciseParse(HANDLER_RESULT_SUCCESS,content);
				}
				if(ParseResult.STEP_NEXT.equals(result.getNextStep())){
					currentNode = result.getNextNode();
					return new ExerciseParse(HANDLER_RESULT_SUCCESS,content);
				}
			}else{
				if(ParseResult.STEP_CUR.equals(result.getNextStep())){
					//20150907 ÐÞ¸Ä;Å×µ½×îÉϲãdoc½âÎöÆ÷ÈÔÈ»ÎÞ·¨¶¨Î»£¬Ö±½Ó½«Îı¾ÄÚÈÝÌí¼Óµ½ÉÏÒ»¸ö½âÎö³É¹¦µÄλÖÃ
					appendTextToLastPosition(doc,content);
					return new ExerciseParse(HANDLER_RESULT_CONTINUE,doc.getLastSuccessType(),content);
				}
				if(ParseResult.STEP_PRE.equals(result.getNextStep())){
					if(currentNode.getParent()==null){
						return new ExerciseParse(HANDLER_RESULT_FAIL,content);
					}
					currentNode = currentNode.getParent();
				}
				if(ParseResult.STEP_NEXT.equals(result.getNextStep())){
					if(result.getNextNode()==null){
						return new ExerciseParse(HANDLER_RESULT_FAIL,content);
					}
					currentNode = result.getNextNode();
				}
			}
			
		}while( count++ < 15);
		
		return new ExerciseParse(HANDLER_RESULT_FAIL,content);
		
	}
	
	public Doc result(){
		return doc;
	}
	
	
	/**
	 * µÃµ½×îгɹ¦µÄ½âÎöÀàÐÍ
	 * 
	 * @param doc doc
	 * @param currNode µ±Ç°½Úµã
	 * @param analysisNode Èç¹ûÊǽâÎö  ²¿·ÖµÄ½âÎöÆ÷£¬·µ»Ø·Ç¿ÕÊý¾Ý£¬ÓÃÓÚ»ñÈ¡½âÎöÆ÷ÀàÐÍ
	 */
	private void generateLastSuccessType(Doc doc,Node currNode,Node analysisNode){
		Parser currParser = currNode.getParser();
		if(null != analysisNode){
			doc.setLastSuccessType(Doc.CURR_SUCCESS_ANALYSIS);
			return ;
		}
		if(currParser instanceof OptionParser){
			doc.setLastSuccessType(Doc.CURR_SUCCESS_OPTION);
			return ;
		}
		if(currParser instanceof ItemParser){
			doc.setLastSuccessType(Doc.CURR_SUCCESS_CONTENT);
			return ;
		}
	}
	
	/**
	 * µÃµ½µ±Ç°½âÎö³É¹¦µÄ×îÐÂλÖãºÈç¹ûÊÇÌâÄ¿µÄ£ºÌâ¸É¡¢Ñ¡Ïî»òÕß½âÎö£¬½«ËûÃÇ×é×°¶ÔӦλÖÃ
	 * 
	 * @param doc
	 * @param content
	 */
	private void appendTextToLastPosition(Doc doc,String content){
		String currSuccessType = doc.getLastSuccessType();
		
		//µÚÒ»²ã ItemType
		List<Node>  lstItemType = doc.getChildren();
		if(null == lstItemType || lstItemType.isEmpty()){
			return ;
		}
		
		//µÚ¶þ²ãItem
		ItemType objItemType = (ItemType)lstItemType.get(lstItemType.size() - 1);
		List<Node>  lstItem = objItemType.getChildren();
		if(null == lstItem || lstItem.isEmpty()){
			return ;
		}
		
		//È¡µ½×îÐÂλÖõÄItem
		Item objItem = (Item)lstItem.get(lstItem.size() - 1);
		if(null != objItem){
			appendTextToCurrPosition(objItem,currSuccessType,content);
		}
	}
	
	/**
	 * ½«µ±Ç°Ã»Óй鵵µÄÄÚÈݼÓÈëµ½¶ÔÓ¦µÄλÖÃ
	 * 
	 * @param objItem
	 * @param currSuccessType
	 * @param content
	 */
	private void appendTextToCurrPosition(Item objItem,String currSuccessType,String content){
		if(Doc.CURR_SUCCESS_CONTENT == currSuccessType){
			objItem.setTitle(objItem.getTitle()+ content);
			currentNode = objItem;
			
		}else if(Doc.CURR_SUCCESS_ANALYSIS == currSuccessType){
			objItem.setAnalysis(objItem.getAnalysis() + content);
			currentNode = objItem;
			
		}else if(Doc.CURR_SUCCESS_OPTION == currSuccessType){
			
			List<Option> lstOptions = objItem.getOptions();
			if(null == lstOptions || lstOptions.isEmpty()){
				return ;
			}
			
			Option opt = null ;
			for(int i = lstOptions.size() -1 ; i>=0 ; i --){
				opt = lstOptions.get(i);
				if(null == opt){
					return ;
				}
				//½«Ñ¡ÏîÌí¼Óµ½×îÐÂλÖÃ
				if(StringUtils.isNotBlank(opt.getNo())){
					opt.setContent(opt.getContent() + content);
					currentNode = objItem;
					return ;
				}
			}
		}
	}
	
	/**
	 * ×Ö·û´®ÊÇ·ñ°üº¬ÖÐÎÄ
	 * @param content
	 * @return
	 */
	private boolean isContentContainsChinese( String content ){
		
		Matcher matcher = pat.matcher(content);
		boolean flg = false;
		if (matcher.find())    {
			flg = true;
		}
		return flg;		
	}
	
}