package org.openautonomousconnection.webserver.api;

import org.openautonomousconnection.protocol.packets.v1_0_1.beta.web.impl.resource.WebResourceResponsePacket;
import org.openautonomousconnection.webserver.Main;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.html.HTMLBodyElement;
import org.w3c.dom.html.HTMLDocument;
import org.w3c.dom.html.HTMLHeadElement;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

/**
 * Server-side Java page (v1.0.1-BETA).
 *
 * <p>Every .java page must extend this class.</p>
 */
public abstract class WebPage {

    private static final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

    private static final DocumentBuilder documentBuilder;

    static {
        DocumentBuilder temp = null;
        try {
            temp = factory.newDocumentBuilder();
        } catch (ParserConfigurationException e) {
            Main.getValues().logger.exception("Failed to create document builder", e);
            temp = null;
        }

        documentBuilder = temp;
    }

    protected final Document document;
    protected final HTMLHeadElement head;
    protected final HTMLBodyElement body;

    /**
     * Default constructor that creates a new Document instance
     */
    public WebPage() {
        this.document = documentBuilder.newDocument();
        this.head = (HTMLHeadElement) this.document.createElement("head");
        this.body = (HTMLBodyElement) this.document.createElement("body");

        this.document.appendChild(this.head);

        this.document.appendChild(this.body);
    }

    /**
     * Handles a web request.
     *
     * @param ctx context (client, request, session)
     * @return resource response packet
     * @throws Exception on unexpected failures
     */
    public abstract WebResourceResponsePacket handle(WebPageContext ctx) throws Exception;
}