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package com.nikedlab.android.inject;

import android.content.Context;
import com.nikedlab.android.inject.exceptions.BeanNotFoundException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
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.util.ArrayList;
import java.util.List;

/**
 * Created with Comodo Inc.
 * User: nike
 * Date: 8/5/13
 * Time: 11:14 PM
 */
public class InjectUtils {

    private static List beans = new ArrayList();

    public static List getBeans(Context context) {

        InputStream configIs;
        DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder dBuilder;
        try {
            configIs = context.getAssets().open("context.xml");
            dBuilder = dbFactory.newDocumentBuilder();
            Document doc = dBuilder.parse(configIs);
            doc.getDocumentElement().normalize();
            NodeList nList = doc.getElementsByTagName("bean");
            for (int temp = 0; temp < nList.getLength(); temp++) {
                Node nNode = nList.item(temp);

                if (nNode.getNodeType() == Node.ELEMENT_NODE) {
                    Bean bean = new Bean();
                    Element element = (Element) nNode;
                    bean.setId(element.getAttribute("id"));
                    bean.setClazz(element.getAttribute("class"));

                    if ("systemService".equals(element.getAttribute("xml:base"))) {
                        bean.setSystemService(true);
                    }

                    if (!"".equals(element.getAttribute("scope"))) {
                        bean.setSingleton(true);
                    }

                    NodeList elementsByTagName = element.getElementsByTagName("constructor-arg");
                    for (int temp2 = 0; temp2 < elementsByTagName.getLength(); temp2++) {
                        Node nNodeChild = elementsByTagName.item(temp2);
                        Element child = (Element) nNodeChild;
                        if (child != null) {
                            Bean.Args args = new Bean().new Args();
                            args.setType(child.getAttribute("type"));
                            args.setValue(child.getAttribute("value"));

                            if (!child.getAttribute("ref").equals("")) {
                                String type = _getTypeByRef(child.getAttribute("ref"));
                                if (!"".equals(type)) {
                                    args.setReferral(type);
                                } else {
                                    throw new BeanNotFoundException("Not found bean with ID: " + child.getAttribute("ref") +
                                    "\nBear in mind what bean with ID in field 'ref' should be declared early");
                                }
                            }

                            bean.setArgs(args);
                        }
                    }

                    beans.add(bean);

                }
            }

        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        }
        return beans;
    }

    private static String _getTypeByRef(String ref){
        for (Bean bean : beans) {
            if(ref.equals(bean.getId())){
                return bean.getClazz();
            }
        }
        return "";
    }

}