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package com.ksyun.api.sdk.utils;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Element;
import org.xml.sax.SAXException;

import com.ksyun.api.sdk.exceptions.ClientException;


public class XmlReader implements Reader {
	Map map = new HashMap();
	
	public Map read(String response,String endpoint) throws ClientException{
		Element root;
		try {
			root = XmlUtils.getRootElementFromString(response);
			read(root, endpoint, false);
		} catch (ParserConfigurationException e) {
			new ClientException("SDK.InvalidXMLParser", e.toString());
		} catch (SAXException e) {
			new ClientException("SDK.InvalidXMLFormat", e.toString());
		} catch (IOException e) {
			new ClientException("SDK.InvalidContent", e.toString());
		}
		return map;
	}

	private void read(Element element, String path, boolean appendPath) {		
		path = buildPath(element, path, appendPath);
		List childElements = XmlUtils.getChildElements(element);
		
		if(childElements.size() == 0){
			map.put(path, element.getTextContent());
			return;
		}
		
		List listElements = XmlUtils.getChildElements(element, childElements.get(0).getNodeName());
		if(listElements.size() > 1 && childElements.size() == listElements.size()){//be list
			elementsAsList(childElements, path);
		}
		else if(listElements.size() == 1 && childElements.size() == 1){//may be list
			elementsAsList(listElements, path);//as list
			read(childElements.get(0), path,true);//as not list
		}
		else {//not list
			for (Element childElement : childElements) {
				read(childElement, path,true);
		    }
		}
	}

	private String buildPath(Element element, String path, boolean appendPath) {		
		return appendPath ? path + "." + element.getNodeName() : path;
	}

	private void elementsAsList(List listElements, String path) {
		map.put(path + ".Length", String.valueOf(listElements.size()));
		for (int i = 0; i < listElements.size(); i++) {
			read(listElements.get(i), path + "[" + i + "]", false);
		}
	}
}