package io.nexilis.util;

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

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class XmlParser {

    public static void main(String[] args) {
        try {
            Path file = Paths.get("./libs/AndroidManifest.xml");
            System.out.println(getMainActivity(Files.newInputStream(file.toFile().toPath())));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String getMainActivity(InputStream inputStream) throws ParserConfigurationException, IOException, SAXException {
        DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
        Document doc = dBuilder.parse(inputStream);
        doc.getDocumentElement().normalize();
        NodeList activity = doc.getElementsByTagName("activity");
        String main = "";
        p:
        for (int i = 0; i < activity.getLength(); i++) {
            Element element = (Element) activity.item(i);
            NodeList intent = element.getElementsByTagName("intent-filter");
            for (int j = 0; j < intent.getLength(); j++) {
                Element element1 = (Element) intent.item(j);
                NodeList action = element1.getElementsByTagName("action");
                for (int k = 0; k < action.getLength(); k++) {
                    Element element2 = (Element) action.item(k);
                    if (element2.getAttribute("android:name").equals("android.intent.action.MAIN")) {
                        main = element.getAttribute("android:name");
                        break p;
                    }
                }
            }
        }
        String[] tmp = main.split("\\.");
        return tmp[tmp.length - 1];
    }
}