package com.utils;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.naming.NoNameCoder;
import com.thoughtworks.xstream.io.xml.Xpp3Driver;
import org.apache.commons.lang3.StringUtils;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import javax.servlet.http.HttpServletRequest;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * XML 工具类
 * +----------------------------------------------------------------------
 * | CRMEB [ CRMEB赋能开发者，助力企业发展 ]
 * +----------------------------------------------------------------------
 * | Copyright (c) 2016~2020 https://www.crmeb.com All rights reserved.
 * +----------------------------------------------------------------------
 * | Licensed CRMEB并不是自由软件，未经许可不能去掉CRMEB相关版权
 * +----------------------------------------------------------------------
 * | Author: CRMEB Team <admin@crmeb.com>
 * +----------------------------------------------------------------------
 */
public class XmlUtil {
    public static Map<String, String> xmlToMap(HttpServletRequest request) {
        Map<String, String> map = new HashMap<>();
        SAXReader reader = new SAXReader();

        InputStream in = null;
        try {
            in = request.getInputStream();
            Document doc = reader.read(in);
            Element root = doc.getRootElement();
            List<Element> list = root.elements();
            for (Element element : list) {
                map.put(element.getName(), element.getText());
            }
        } catch (IOException | DocumentException e) {
            e.printStackTrace();
        } finally {
            try {
                assert in != null;
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return map;
    }

    /**
     * 将发送消息封装成对应的xml格式
     */
    public static HashMap<String, Object> xmlToMap(String strxml) throws Exception {
        strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");

        HashMap<String, Object> map = new HashMap<>();
        SAXReader reader = new SAXReader();
        InputStream inputStream = new ByteArrayInputStream(strxml.getBytes(StandardCharsets.UTF_8));

        if (StringUtils.isBlank(strxml)) {
            return null;
        }

        Document document = reader.read(inputStream);
        Element root = document.getRootElement();
        List<Element> list = root.elements();

        for (Element e : list) {
            map.put(e.getName(), e.getText());
        }
        inputStream.close();

        return map;
    }

    /**
     * 将发送消息封装成对应的xml格式
     */
    public static String objectToXml(Object object) {
        XStream xstream = new XStream(new Xpp3Driver(new NoNameCoder())); //不需要转义
        xstream.alias("xml", object.getClass());
        return xstream.toXML(object);
    }

    /**
     * 将Map转换为XML格式的字符串
     *
     * @param data Map类型数据
     * @return XML格式的字符串
     * @throws Exception
     */
    public static String mapToXml(Map<String, String> data) throws Exception {
        org.w3c.dom.Document document = WXPayXmlUtil.newDocument();
        org.w3c.dom.Element root = document.createElement("xml");
        document.appendChild(root);
        for (String key : data.keySet()) {
            String value = data.get(key);
            if (value == null) {
                value = "";
            }
            value = value.trim();
            org.w3c.dom.Element filed = document.createElement(key);
            filed.appendChild(document.createTextNode(value));
            root.appendChild(filed);
        }
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer transformer = tf.newTransformer();
        DOMSource source = new DOMSource(document);
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        StringWriter writer = new StringWriter();
        StreamResult result = new StreamResult(writer);
        transformer.transform(source, result);
        String output = writer.getBuffer().toString(); //.replaceAll("\n|\r", "");
        writer.close();
        return output;
    }
}
