// Copyright 2007, 2008, 2012, 2014 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package org.apache.tapestry5.validator;

import org.apache.tapestry5.Field;
import org.apache.tapestry5.MarkupWriter;
import org.apache.tapestry5.ValidationException;
import org.apache.tapestry5.commons.MessageFormatter;
import org.apache.tapestry5.services.FormSupport;
import org.apache.tapestry5.services.Html5Support;
import org.apache.tapestry5.services.javascript.DataConstants;
import org.apache.tapestry5.services.javascript.JavaScriptSupport;

/* A vaidator that enforces that a number is greater than some minimum integer value. */
public class Min extends AbstractValidator<Long, Number>
{
    final private Html5Support html5Support;
    
    public Min(JavaScriptSupport javaScriptSupport, Html5Support html5Support)
    {
        super(Long.class, Number.class, "min-integer", javaScriptSupport);
        this.html5Support = html5Support;
    }

    public void validate(Field field, Long constraintValue, MessageFormatter formatter, Number value)
            throws ValidationException
    {
        if (value.longValue() < constraintValue)
            throw new ValidationException(buildMessage(formatter, field, constraintValue));
    }

    private String buildMessage(MessageFormatter formatter, Field field, Long constraintValue)
    {
        return formatter.format(constraintValue, field.getLabel());
    }

    public void render(Field field, Long constraintValue, MessageFormatter formatter, MarkupWriter writer,
                       FormSupport formSupport)
    {
        if (formSupport.isClientValidationEnabled())
        {
            javaScriptSupport.require("t5/core/validation");
            writer.attributes(DataConstants.VALIDATION_ATTRIBUTE, true,
                    "data-validate-min", constraintValue.toString(),
                    "data-min-message", buildMessage(formatter, field, constraintValue));
        }
        if (html5Support.isHtml5SupportEnabled())
        {
            writer.getElement().forceAttributes("type", "number", "min", String.valueOf(constraintValue));
        }
    }
}
