package pt.ist.renderers;

import java.util.List;

import pt.ist.renderers.components.HtmlCheckBox;
import pt.ist.renderers.components.HtmlComponent;
import pt.ist.renderers.components.HtmlHiddenField;
import pt.ist.renderers.components.HtmlInlineContainer;
import pt.ist.renderers.components.HtmlSimpleValueComponent;
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;

/**
 * This renderer allows you choose several object from a list of choices. The
 * list of choices is presented in a table but each row has a checkbox that
 * allows you to select the object in that row.
 * 
 * <p>
 * The list of options is given by a
 * {@link pt.ist.renderers.DataProvider data provider}.
 * 
 * <p>
 * Example:
 * <table border="1">
 * <thead>
 * <th></th>
 * <th>Name</th>
 * <th>Age</th>
 * <th>Gender</th>
 * </thead>
 * <tr>
 * <td><input type="checkbox"/></td>
 * <td>Name A</td>
 * <td>20</td>
 * <td>Female</td>
 * </tr>
 * <tr>
 * <td><input type="checkbox" checked="checked"/></td>
 * <td>Name B</td>
 * <td>22</td>
 * <td>Male</td>
 * </tr>
 * <tr>
 * <td><input type="checkbox" checked="checked"/></td>
 * <td>Name C</td>
 * <td>21</td>
 * <td>Female</td>
 * </tr>
 * </table>
 * 
 * @author pcma
 */
public class TabularOptionInputRendererWithPostBack extends TabularOptionInputRenderer {

    private String destination;

    public String getDestination() {
	return destination;
    }

    public void setDestination(String destination) {
	this.destination = destination;
    }

    @Override
    protected HtmlComponent renderComponent(Layout layout, Object object, Class type) {
	HtmlComponent component = super.renderComponent(layout, object, type);

	CheckableTabularLayout checkableLayout = (CheckableTabularLayout) layout;
	List<HtmlCheckBox> checkboxes = checkableLayout.getCheckBoxes();

	for (HtmlCheckBox checkbox : checkboxes) {
	    checkbox.setOnClick("this.form.postback.value=1; this.form.submit();");
	}

	HtmlInlineContainer htmlInlineContainer = new HtmlInlineContainer();
	HtmlHiddenField hiddenField = new HtmlHiddenField();
	hiddenField.setName("postback");
	htmlInlineContainer.addChild(hiddenField);
	htmlInlineContainer.addChild(component);
	hiddenField.setController(new PostBackController(getDestination()));
	return htmlInlineContainer;
    }

    private static class PostBackController extends HtmlController {

	private final String destination;

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

	@Override
	public void execute(IViewState viewState) {
	    HtmlSimpleValueComponent component = (HtmlSimpleValueComponent) getControlledComponent();

	    if (component.getValue() != null && component.getValue().length() > 0) {
		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);
	    }

	    component.setValue(null);
	}

    }

}