/*******************************************************************************
 * Copyright (c) 2007, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Tom Schindl<tom.schindl@bestsolution.at> - bugfix for 217940
 *******************************************************************************/

module org.eclipse.core.internal.databinding.validation.StringToDateValidator;

import java.lang.all;

import java.util.Date;

import org.eclipse.core.databinding.validation.IValidator;
import org.eclipse.core.databinding.validation.ValidationStatus;
import org.eclipse.core.internal.databinding.BindingMessages;
import org.eclipse.core.internal.databinding.conversion.DateConversionSupport;
import org.eclipse.core.internal.databinding.conversion.StringToDateConverter;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;

/**
 * @since 1.0
 */
public class StringToDateValidator : IValidator {
    private final StringToDateConverter converter;

    /**
     * @param converter
     */
    public this(StringToDateConverter converter) {
        this.converter = converter;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.eclipse.core.databinding.validation.IValidator#validate(java.lang.Object)
     */
    public IStatus validate(Object value) {
        if ( null !is cast(String )value && (cast(String)value).trim().length() is 0) {
            return Status.OK_STATUS;
        }
        Object convertedValue = converter.convert(value);
        //The StringToDateConverter returns null if it can't parse the date.
        if (convertedValue is null) {
            return ValidationStatus.error(getErrorMessage());
        }

        return Status.OK_STATUS;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.eclipse.core.internal.databinding.validation.WrappedConverterValidator#getErrorMessage()
     */
    protected String getErrorMessage() {
        Date sampleDate = new Date();

        // FIXME We need to use the information from the
        // converter, not use another instance of DateConversionSupport.
        FormatUtil util = new FormatUtil();
        StringBuffer samples = new StringBuffer();
        for (int formatterIdx = 1; formatterIdx < util.numFormatters() - 2; formatterIdx++) {
            samples.append('\'');
            samples.append(util.format(sampleDate, formatterIdx));
            samples.append("', "); //$NON-NLS-1$
        }
        samples.append('\'');
        samples.append(util.format(sampleDate, 0));
        samples.append('\'');
        return BindingMessages.getStringcast(BindingMessages.EXAMPLES) + ": " + samples + ",..."; //$NON-NLS-1$//$NON-NLS-2$
    }

    private static class FormatUtil : DateConversionSupport {
        /*
         * (non-Javadoc)
         *
         * @see org.eclipse.core.internal.databinding.conversion.DateConversionSupport#numFormatters()
         */
        protected int numFormatters() {
            return super.numFormatters();
        }

        /*
         * (non-Javadoc)
         *
         * @see org.eclipse.core.internal.databinding.conversion.DateConversionSupport#format(java.util.Date)
         */
        protected String format(Date date) {
            return super.format(date);
        }

        /*
         * (non-Javadoc)
         *
         * @see org.eclipse.core.internal.databinding.conversion.DateConversionSupport#format(java.util.Date,
         *      int)
         */
        protected String format(Date date, int formatterIdx) {
            return super.format(date, formatterIdx);
        }
    }
}