package net.sourceforge.fenixedu.presentationTier.renderers;

import pt.ist.fenixWebFramework.renderers.components.HtmlBlockContainer;
import pt.ist.fenixWebFramework.renderers.components.HtmlComponent;
import pt.ist.fenixWebFramework.renderers.components.HtmlHiddenField;
import pt.ist.fenixWebFramework.renderers.components.controllers.HtmlController;
import pt.ist.fenixWebFramework.renderers.components.state.IViewState;
import pt.ist.fenixWebFramework.renderers.components.state.ViewDestination;
import pt.ist.fenixWebFramework.renderers.model.MetaSlot;

/**
 * This renderer extends the {@link AutoCompleteInputRenderer} and allows to
 * perform a postback whenever a valid option listed as auto-completion is
 * chosen.
 * 
 * @author João Neves - JoaoRoxoNeves@ist.utl.pt
 */
public class AutoCompleteInputRendererWithPostBack extends AutoCompleteInputRenderer {

    private final String HIDDEN_NAME = "postback";

    private String destination;

    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
    public HtmlComponent render(Object object, Class type) {
	String prefix = HtmlComponent.getValidIdOrName(((MetaSlot) getInputContext().getMetaObject()).getKey().toString()
		.replaceAll("\\.", "_").replaceAll("\\:", "_"));

	HtmlHiddenField hidden = new HtmlHiddenField(prefix + HIDDEN_NAME, "");

	HtmlBlockContainer container = (HtmlBlockContainer) super.render(object, type);
	HtmlHiddenField hiddenValue = null;
	for (HtmlComponent childComponent : container.getChildren()) {
	    if ((childComponent instanceof HtmlHiddenField) && (childComponent.getId().endsWith("_AutoComplete"))) {
		hiddenValue = (HtmlHiddenField) childComponent;
	    }
	}
	hiddenValue.setOnChange("this.form." + prefix + HIDDEN_NAME + ".value='true';this.form.submit();");
	hiddenValue.setController(new PostBackController(hidden, getDestination()));

	container.addChild(hidden);

	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().equalsIgnoreCase("true")) {
		String destinationName = this.destination == null ? "postback" : this.destination;
		ViewDestination destination = viewState.getDestination(destinationName);

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

		hidden.setValue("false");
		viewState.setSkipValidation(true);
	    }

	}

    }
}