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import java.util.Collections;

import wicket.markup.html.form.Form;
import wicket.markup.html.form.FormComponent;
import wicket.markup.html.form.validation.AbstractFormValidator;
import wicket.util.lang.Objects;

/**
 * Validates that one of the input of two form components is not empty. Errors
 * are reported on the second form component with key 'OrInputValidator' and the
 * variables:
 * <ul>
 * <li>${input(n)}: the user's input</li>
 * <li>${name}: the name of the component</li>
 * <li>${label(n)}: the label of the component - either comes from
 * FormComponent.labelModel or resource key [form-id].[form-component-id] in
 * that order</li>
 * </ul>
 * 
 * @author Ivailo Bardarov
 * @see wicket.markup.html.form.validation.EqualInputValidator by Igor Vaynberg
 * 
 */
public class OrInputValidator extends AbstractFormValidator {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	/** form components to be checked. */
	private final FormComponent[] components;

	/**
	 * Construct.
	 * 
	 * @param formComponent1
	 *            a form component
	 * @param formComponent2
	 *            a form component
	 */
	public OrInputValidator(FormComponent formComponent1,
			FormComponent formComponent2) {
		if (formComponent1 == null) {
			throw new IllegalArgumentException(
					"argument formComponent1 cannot be null");
		}
		if (formComponent2 == null) {
			throw new IllegalArgumentException(
					"argument formComponent2 cannot be null");
		}
		components = new FormComponent[] { formComponent1, formComponent2 };
	}

	/**
	 * @see wicket.markup.html.form.validation.IFormValidator#getDependentFormComponents()
	 */
	public FormComponent[] getDependentFormComponents() {
		return components;
	}

	/**
	 * @see wicket.markup.html.form.validation.IFormValidator#validate(wicket.markup.html.form.Form)
	 */
	public void validate(Form form) {
		// we have a choice to validate the type converted values or the raw
		// input values, we validate the raw input
		final FormComponent formComponent1 = components[0];
		final FormComponent formComponent2 = components[1];

		if (
				"".equals(Objects.stringValue(formComponent1.getInput(), true)) &&
				"".equals(Objects.stringValue(formComponent2.getInput(), true))
				   ) {
			final String key = resourceKey(components);
			formComponent2.error(Collections.singletonList(key), messageModel());
		}
	}
}