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

import java.util.List;

import com.qxueyou.scc.exercise.service.impl.Node;
import com.qxueyou.scc.exercise.service.impl.ParseResult;
import com.qxueyou.scc.exercise.service.impl.Parser;
import com.qxueyou.scc.exercise.service.impl.node.Doc;
import com.qxueyou.scc.exercise.service.impl.node.ItemType;

/**
 * 文档解析器
 * @author 德虎
 *
 */
public class DocParser extends Parser {

	@Override
	public ParseResult parse(Node node, String str) {
		return parse((Doc)node,str);
	}
	
	/**
	 * 解析 Doc
	 * @param doc
	 * @param str
	 * @return
	 */
	private ParseResult parse(Doc doc, String str) {

		if(str.contains("单选")||str.contains("单项选择")){
			return tryNextNodeParser(doc,ItemType.TYPE_SINGLE);
		}
		
		if(str.contains("多选")||str.contains("多项选择")){
			return tryNextNodeParser(doc,ItemType.TYPE_MULTI);
		}
		
		if(str.contains("判断")){
			return tryNextNodeParser(doc,ItemType.TYPE_TRUE_OR_FALSE);
		}
		
		return new ParseResult(false,ParseResult.STEP_CUR,null);
	}

	private ParseResult tryNextNodeParser(Doc doc,String type) {
		
		List<Node> children = doc.getChildren();
		Node child = null;
		
		if(children!=null && !children.isEmpty()){
			child = doc.getChild("TYPE",type);
		}
		
		if(child==null){
			child = new ItemType(type);
			doc.addNode(child);
		}
		
		return new ParseResult(false,ParseResult.STEP_NEXT,child);
	}

}