package pt.ist.renderers.validators;

import org.apache.commons.lang.StringUtils;

import pt.ist.renderers.components.HtmlSimpleValueComponent;
import pt.ist.renderers.components.Validatable;

public class RequiredValidator extends HtmlValidator {

    public RequiredValidator() {
	super();
    }

    public RequiredValidator(HtmlChainValidator htmlChainValidator) {
	super(htmlChainValidator);
    }

    @Override
    public void performValidation() {
	Validatable component = getComponent();

	// TODO: cfgi, clear the semantic and uses of the Validatable interface
	// try to use only the interface instead of a check on the type

	if (component instanceof HtmlSimpleValueComponent) {
	    if (component.getValue() == null) {
		setValid(false);
	    } else {
		setValid(!component.getValue().equals(""));
	    }
	} else {
	    String[] values = component.getValues();

	    if (values == null) {
		setValid(false);
	    } else {
		setValid(values.length > 0);
	    }
	}
    }

    @Override
    public boolean hasJavascriptSupport() {
	return true;
    }

    @Override
    protected String getSpecificValidatorScript() {
	return "function(element) { return $(element).attr('value').length > 0; }";
    }

    @Override
    public String getMessage() {
	if (StringUtils.isEmpty(super.getMessage())) {
	    setMessage("renderers.validator.required");
	}
	return super.getMessage();
    }
}