package eu.siacs.conversations.xml;

import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;

import eu.siacs.conversations.utils.XmlHelper;
import eu.siacs.conversations.xmpp.jid.InvalidJidException;
import eu.siacs.conversations.xmpp.jid.Jid;

public class Element {
	protected String name;
	protected Hashtable<String, String> attributes = new Hashtable<>();
	protected String content;
	protected List<Element> children = new ArrayList<>();

	public Element(String name) {
		this.name = name;
	}

	public Element addChild(Element child) {
		this.content = null;
		children.add(child);
		return child;
	}

	public Element addChild(String name) {
		this.content = null;
		Element child = new Element(name);
		children.add(child);
		return child;
	}

	public Element addChild(String name, String xmlns) {
		this.content = null;
		Element child = new Element(name);
		child.setAttribute("xmlns", xmlns);
		children.add(child);
		return child;
	}

	public Element setContent(String content) {
		this.content = content;
		this.children.clear();
		return this;
	}

	public Element findChild(String name) {
		for (Element child : this.children) {
			if (child.getName().equals(name)) {
				return child;
			}
		}
		return null;
	}

	public Element findChild(String name, String xmlns) {
		for (Element child : this.children) {
			if (child.getName().equals(name)
					&& (child.getAttribute("xmlns").equals(xmlns))) {
				return child;
			}
		}
		return null;
	}

	public boolean hasChild(String name) {
		return findChild(name) != null;
	}

	public boolean hasChild(String name, String xmlns) {
		return findChild(name, xmlns) != null;
	}

	public List<Element> getChildren() {
		return this.children;
	}

	public Element setChildren(List<Element> children) {
		this.children = children;
		return this;
	}

	public String getContent() {
		return content;
	}

	public Element setAttribute(String name, String value) {
		if (name != null && value != null) {
			this.attributes.put(name, value);
		}
		return this;
	}

	public Element setAttributes(Hashtable<String, String> attributes) {
		this.attributes = attributes;
		return this;
	}

	public String getAttribute(String name) {
		if (this.attributes.containsKey(name)) {
			return this.attributes.get(name);
		} else {
			return null;
		}
	}

	public Jid getAttributeAsJid(String name) {
		final String jid = this.getAttribute(name);
        if (jid != null && !jid.isEmpty()) {
            try {
                return Jid.fromString(jid);
            } catch (final InvalidJidException e) {
                return null;
            }
        }
        return null;
	}

	public Hashtable<String, String> getAttributes() {
		return this.attributes;
	}

	public String toString() {
		StringBuilder elementOutput = new StringBuilder();
		if ((content == null) && (children.size() == 0)) {
			Tag emptyTag = Tag.empty(name);
			emptyTag.setAtttributes(this.attributes);
			elementOutput.append(emptyTag.toString());
		} else {
			Tag startTag = Tag.start(name);
			startTag.setAtttributes(this.attributes);
			elementOutput.append(startTag);
			if (content != null) {
				elementOutput.append(XmlHelper.encodeEntities(content));
			} else {
				for (Element child : children) {
					elementOutput.append(child.toString());
				}
			}
			Tag endTag = Tag.end(name);
			elementOutput.append(endTag);
		}
		return elementOutput.toString();
	}

	public String getName() {
		return name;
	}

	public void clearChildren() {
		this.children.clear();
	}

	public void setAttribute(String name, long value) {
		this.setAttribute(name, Long.toString(value));
	}

	public void setAttribute(String name, int value) {
		this.setAttribute(name, Integer.toString(value));
	}
}