package pt.ist.renderers.extensions.validators;

import org.apache.commons.lang.StringUtils;

import pt.ist.renderers.utils.RenderUtils;
import pt.ist.renderers.validators.HtmlChainValidator;
import pt.ist.renderers.validators.HtmlValidator;

public class NumberRangeValidator extends HtmlValidator {

    private boolean isNumber;

    private Integer upperBound;

    private Integer lowerBound;

    public NumberRangeValidator() {
	super();

	upperBound = null;
	lowerBound = null;
    }

    public NumberRangeValidator(HtmlChainValidator htmlChainValidator) {
	super(htmlChainValidator);

	upperBound = null;
	lowerBound = null;
    }

    public Integer getLowerBound() {
	return lowerBound;
    }

    public void setLowerBound(Integer lowerBound) {
	this.lowerBound = lowerBound;
    }

    public Integer getUpperBound() {
	return upperBound;
    }

    public void setUpperBound(Integer upperBound) {
	this.upperBound = upperBound;
    }

    @Override
    public void performValidation() {

	String numberText = getComponent().getValue();

	if (!StringUtils.isEmpty(numberText)) {
	    try {
		int number = Integer.parseInt(numberText.trim());

		boolean inRange = true;
		isNumber = true;

		if (lowerBound != null) {
		    inRange &= lowerBound <= number;
		}

		if (upperBound != null) {
		    inRange &= upperBound >= number;
		}

		this.setValid(inRange);
	    } catch (NumberFormatException e) {
		isNumber = false;
		setValid(false);
	    }
	}
    }

    @Override
    public String getErrorMessage() {
	if (!isNumber) {
	    return RenderUtils.getResourceString("renderers.validator.number.integer");
	}

	if (lowerBound != null && upperBound != null) {
	    return RenderUtils.getFormatedResourceString("renderers.validator.number.range.both", lowerBound, upperBound);
	}

	if (lowerBound != null) {
	    return RenderUtils.getFormatedResourceString("renderers.validator.number.range.lower", lowerBound);
	}

	return RenderUtils.getFormatedResourceString("renderers.validator.number.range.upper", upperBound);
    }

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

    @Override
    protected String getSpecificValidatorScript() {
	return "function(element) { var text = $(element).attr('value'); var lb = "
		+ getLowerBound()
		+ "; var ub = "
		+ getUpperBound()
		+ ";"
		+ "return text.length == 0 || ((lb == null || (lb != null && parseInt(text) >= lb)) && (ub == null || (ub != null && parseInt(text) <= ub))); }";
    }

    @Override
    protected String getJavascriptErrorMessage() {
	if (lowerBound != null && upperBound != null) {
	    return RenderUtils.getFormatedResourceString("renderers.validator.number.range.both", lowerBound, upperBound);
	}

	if (lowerBound != null) {
	    return RenderUtils.getFormatedResourceString("renderers.validator.number.range.lower", lowerBound);
	}

	return RenderUtils.getFormatedResourceString("renderers.validator.number.range.upper", upperBound);
    }
}