package pt.ist.renderers.extensions;

import pt.ist.renderers.EnumRadioInputRenderer;
import pt.ist.renderers.components.HtmlComponent;
import pt.ist.renderers.components.HtmlHiddenField;
import pt.ist.renderers.components.HtmlInlineContainer;
import pt.ist.renderers.components.HtmlRadioButton;
import pt.ist.renderers.components.HtmlRadioButtonList;
import pt.ist.renderers.components.controllers.HtmlController;
import pt.ist.renderers.components.state.IViewState;
import pt.ist.renderers.components.state.ViewDestination;
import pt.ist.renderers.layouts.Layout;
import pt.ist.renderers.model.MetaSlot;

public class EnumRadioInputRendererWithPostBack extends EnumRadioInputRenderer {

    private String destination;
    private final String HIDDEN_NAME = "postback";

    public String getDestination() {
	return destination;
    }

    /**
     * Allows to choose the postback destination. If this property is not
     * specified the default "postback" destination is used.
     * 
     * @property
     */
    public void setDestination(String destination) {
	this.destination = destination;
    }

    @Override
    protected Layout getLayout(Object object, Class type) {
	final Layout layout = super.getLayout(object, type);

	return new Layout() {

	    @Override
	    public HtmlComponent createComponent(Object object, Class type) {
		HtmlInlineContainer container = new HtmlInlineContainer();

		String prefix = HtmlComponent.getValidIdOrName(((MetaSlot) getInputContext().getMetaObject()).getKey().toString()
			.replaceAll("\\.", "_").replaceAll("\\:", "_"));

		HtmlHiddenField hidden = new HtmlHiddenField(prefix + HIDDEN_NAME, "");
		hidden.setController(new PostBackController(hidden, getDestination()));

		HtmlRadioButtonList radioButtonList = (HtmlRadioButtonList) layout.createComponent(object, type);

		for (HtmlRadioButton button : radioButtonList.getRadioButtons()) {
		    button.setOnClick("this.form." + prefix + HIDDEN_NAME + ".value='true';this.form.submit();");
		    button.setOnDblClick("this.form." + prefix + HIDDEN_NAME + ".value='true';this.form.submit();");

		}

		if (getClasses() != null) {
		    applyStyle(radioButtonList);
		}

		container.addChild(hidden);
		container.addChild(radioButtonList);

		return container;
	    }

	};
    }

    private static class PostBackController extends HtmlController {

	private final HtmlHiddenField hidden;

	private final String destination;

	public PostBackController(HtmlHiddenField hidden, String destination) {
	    this.hidden = hidden;
	    this.destination = destination;
	}

	@Override
	public void execute(IViewState viewState) {
	    if (hidden.getValue() != null && hidden.getValue().length() != 0) {
		hidden.setValue(null);

		String destinationName = this.destination == null ? "postBack" : this.destination;
		ViewDestination destination = viewState.getDestination(destinationName);

		if (destination != null) {
		    viewState.setCurrentDestination(destination);
		} else {
		    viewState.setCurrentDestination("postBack");
		}

		viewState.setSkipValidation(true);
	    }

	}

    }
}